MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

33998 Simplified Application Diagram

Document order number: MC33998/D

Rev 1.0, 03/2003

33998

Advance Information

Switching Power Supply with Linear

Regulators

The 33998 is a medium-power, multi-output power supply integrated circuit

that is capable of operating over a wide input voltage range, from 6.0 V up to
26.5 V with 40 V transient capability. It incorporates a sensorless current
mode control step-down switching controller regulating directly to 5.0 V. The
2.6 V linear regulator uses an external pass transistor to reduce the 33998
power dissipation. The 33998 also provides a 2.6 V linear standby regulator
and two 5.0 V sensor supply outputs protected by internal low-resistance
LDMOS transistors.

There are two separate enable pins for the main and sensor supply outputs

and standard supervisory functions such as resets with power-up reset delay.

The 33998 provides proper power supply sequencing for advanced

microprocessor architectures such as the Motorola MPC5xx and 683xx
microprocessor families.

Features

· Operating Voltage Range 6.0 V up to 26.5 V (40 V transient)
· Step-Down Switching Regulator Output V

DDH

= 5.0 V @ 1400 mA (total)

· Linear Regulator with External Pass Transistor V

DDL

= 2.6 V @ 400 mA

· Low-Power Standby Linear Regulator V

KAM

= 2.6 V @ 10 mA

· Two 5.0 V @ 200 mA (typical) Sensor Supplies V

REF

Protected Against

Short-to-Battery and Short-to-Ground with Retry Capability

· Undervoltage Shutdown on the V

DDL

, V

DDH

Outputs with Retry Capability

· Reset Signals
· Power-Up Delay
· Enable Pins for Main Supplies (EN) and Sensor Supplies (SNSEN)
· Power Sequencing for Advanced Microprocessor Architectures
· SOIC-24WB Package

SNSEN

VREF1

5.0 V

VPWR

KA_VPWR

GND

33998

VSW

VDDH

DRVL

FBL

PWROK

VKAM

VKAMOK

VREF2

5.0 V

2.6 V

MCU

VDDH

VDDL

VKAM

ORDERING INFORMATION

Device

Temperature

Range (T

)

Package

MC33998DW/R2

-40°C to 125°C

24 SOICW

DW SUFFIX

24-LEAD SOICW

CASE 751E

POWER SUPPLY

INTEGRATED CIRCUIT

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33998

PIN FUNCTION DESCRIPTION

Pin

Pin Name

Description

VKAMOK

Keep-Alive Output Monitoring. This pin is an "open-drain" output that will be used with a discrete pull-up resistor
to V

KAM

. When the supply voltage to the 33998 is disconnected or lost, the VKAMOK signal goes low.

KA_V

PWR

Keep Alive Power Supply Pin. This supply pin is used in modules that have both direct battery connections and
ignition switch activated connections.

RES

Reservoir Capacitor. This pin is tied to an external "reservoir capacitor" for the internal charge pump.

PWR

Power Supply Pin. Main power input to the IC. This pin is directly connected to the switching regulator power
MOSFET. In automotive applications this pin must be protected against reverse battery conditions by an
external diode.

GND

Ground of the integrated circuit.

Internal P-Channel Power MOSFET Drain. V

is the "switching node" of the voltage buck converter. This pin

is connected to the V

PWR

pin by an integrated p-channel MOSFET.

PWROK

Power OK Reset Pin. This pin is an "open-drain" output that will be used with a discrete pull-up resistor to
V

KAM

, V

DDH

, or V

DDL

. When either V

DDH

or V

DDL

output voltage goes out of the regulation limits this pin is

pulled down.

FBKB

Step-Down Switching Regulator Feedback Pin. The FBKB pin is the V

DDH

feedback signal for the switching

regulator.

SUM

Error Amplifier "Summing Node". The V

SUM

pin is connected to the inverting input of the error amplifier. This

node is also the "common" point of the integrated feedback resistor divider.

DRVL

Drive for V

DDL

(2.6 V) Regulator. The DRVL pin drives the base of an external NPN pass transistor for the

DDL

linear post regulator. The collector of the VDDL pass transistor is connected to V

DDH

. An example of a

suitable pass transistor is BCP68.

FBL

Feedback for V

DDL

(2.6 V) Regulator. The FBL pin is the voltage feedback sense signal from the V

DDL

(2.6 V)

linear post regulator.

DDH

is an input supply pin providing power for the buffered sensor supplies and the drive circuitry for the 2.6 V

linear power regulator. The V

DDH

pin is supplied from the switching regulator output, capable of providing 5.0 V

@ 1400 mA total output current.

REF2

Sensor Supply #2 Output. The V

REF2

pin is sensor supply output #2.

1720

GND

Ground of the integrated circuit.

REF1

Sensor Supply #1 Output. The V

REF1

pin is sensor supply output #1.

KAM

GND
GND
GND
GND
V

REF2

DDH

FBL
DRVL

EN
SNSEN
V

REF1

VKAMOK

GND
GND
GND
GND

PWROK

SUM

KA_V

PWR

RES

PWR

FBKB

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33998

MAXIMUM RATINGS
All voltages are with respect to ground unless otherwise noted.

Rating

Symbol

Value

Unit

Main Supply Voltage

PWR

-0.3 to 45

Keep-Alive Supply Voltage

KA_V

PWR

-0.3 to 45

Switching Node

-0.5 to 45

5.0 V Input Power

DDH

-0.3 to 6.0

Sensor Supply

REF1

REF2

-0.3 to 18
-0.3 to 18

Keep-Alive Supply Voltage

KAM

-0.3 to 6.0

Maximum Voltage at Logic I/O Pins

SNSEN

PWROK

VKAMOK

-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0
-0.3 to 6.0

Charge Pump Reservoir Capacitor Voltage

RES

-0.3 to 18

Error Amplifier Summing Node

SUM

-0.3 to 6.0

Switching Regulator Output Feedback

FBKB

-0.3 to 6.0

DDL

Base Drive

DRVL

-0.3 to 6.0

DDL

Feedback

FBL

-0.3 to 6.0

ESD Voltage

Human Body Model (all pins) (Note 1)
Machine Model (all pins) (Note 2)

ESD1

ESD2

±500
±100

Power Dissipation (T

= 25

°C) (Note 3)

800

Thermal Resistance, Junction to Ambient (Note 4), (Note 5)

J-A

°C/W

Thermal Resistance, Junction to Board (Note 6)

J-B

°C/W

Operational Package Temperature [Ambient Temperature] (Note 7)

-40 to 125

°C

Operational Junction Temperature

-40 to 150

°C

Storage Temperature

STG

-55 to 150

°C

Lead Soldering Temperature (Note 8)

260

°C

Notes

ESD1 testing is performed in accordance with the Human Body Model (C

ZAP

=100 pF, R

ZAP

=1500

ESD2 testing is performed in accordance with the Machine Model (C

ZAP

=200 pF, R

ZAP

)

Maximum power dissipation at indicated junction temperature.

Junction temperature is a function of on-chip power dissipation, package thermal resistance, mounting site (board) temperature, ambient
temperature, air flow, power dissipation of other components on the board, and board thermal resistance.

Per SEMI G38-87 and JEDEC JESD51-2 with the single layer board horizontal.

Thermal resistance between the die and the printed circuit board per JEDEC JESD51-8. Board temperature is measured on the top surface
of the board near the package.

The limiting factor is junction temperature, taking into account the power dissipation, thermal resistance, and heat sinking.

Lead soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may
cause malfunction or permanent damage to the device.

33998

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

STATIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 9.0 V

PWR

16 V, -40

°C

= T

125

°C, using the typical application circuit (see

Figure 8

) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T

= 25

°C under nominal

conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

GENERAL

Supply Voltage Range

Normal Operating Voltage Range (Note 9)
Extended Operating Voltage Range (Note 9)

PWR(N)

PWR(E)

6.0

26.5

Maximum Transient Voltage - Load Dump (Note 10)

PWR(LD)

PWR

Supply Current

EN = 5.0 V, V

PWR

= 14 V, No Loads

VPWR

150

PWR

Quiescent Supply Current

EN = 0 V, V

PWR

= 12 V

Q_VPWR

5.0

µA

KA_V

PWR

Supply Current,

EN = 5.0 V, KA_V

PWR

= 14 V, No Load on V

KAM

KAVPWR

0.5

3.0

KA_V

PWR

Quiescent Supply Current

EN = 0 V, KA_V

PWR

= 12 V

Q_KAVPWR

350

µA

BUCK REGULATOR V

DDH

Buck Converter Output Voltage

VDDH

= 200 mA to 1.4 A, V

PWR

= KA_V

PWR

= 14 V

DDH

4.9

5.1

Buck Converter Output Voltage

VDDH

= 1.4 A, V

PWR

= KA_V

PWR

= 6.0 V

DDH

4.9

5.1

DDH

Line Regulation

PWR

= KA_V

PWR

= 10 V to 14 V, I

VDDH

= 200 mA

RegLn

VDDH

-20

DDH

Load Regulation

PWR

= KA_V

PWR

= 14 V, I

VDDH

= 200 mA to 1.4 A

PWR

= KA_V

PWR

= 6.0 V, I

VDDH

= 200 mA to 1.4 A

RegLd

VDDH

-20
-20

20
20

DDH

Active Discharge Resistance

PWR

= KA_V

PWR

= 14 V, EN = 0 V, I

VDDH

= 10 mA

HDisch

1.0

P-CHANNEL MOSFET

Drain-Source Breakdown Voltage--Not Tested (Note 11)

DSS

Drain-Source Current Limit--Not Tested (Note 11)

Isc

SW1

-7.0

Notes

DDH

is fully functional when the 33998 is operating at higher battery voltages, but these parameters are not tested. The test condition as are:

a) V

DDH

must be between 4.9 V and 5.1 V (200 mA to 1.4 A) for V

PWR

= 14 V to 18 V.

b) V

DDH

must be between 4.8 V and 5.5 V (200 mA to 1.4 A) for V

PWR

= 18 V to 26.5 V.

10.

Part can survive, but no parameters are guaranteed.

11.

Guaranteed by design but not production tested.

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33998

STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 9.0 V

PWR

16 V, -40

°C

= T

125

°C, using the typical application circuit (see

Figure 8

) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T

= 25

°C under nominal

conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

LINEAR REGULATOR V

DDL

DDL

Output Voltage

PWR

= KA_V

PWR

= 14 V, I

VDDL

= 200 mA

DDL

2.5

2.6

2.7

DDL

Line Regulation

DDH

= 4.8 V to 5.2 V, I

VDDL

= 400 mA

RegLn

VDDL

-30

DDL

Load Regulation

PWR

= KA_V

PWR

= 14 V, I

VDDL

= 10 mA to 400 mA

RegLd

VDDL

-70

DRVL Output Current

PWR

= KA_V

PWR

= 14 V, VDRVL = 1.0 V

DRVL

5.0

DDL

Active Discharge Resistance

PWR

= KA_V

PWR

= 14 V, EN = 0 V, I

FBL

= 10 mA

LDisch

1.0

DDH

to V

DDL

Active Clamp Resistance

PWR

= KA_V

PWR

= 14 V, EN = 0 V, I

VDDH

= 50 mA, V

FBKB

= 0 V

CLAMP

0.6

DDL

Output Capacitor Capacitance (Note 12)

VDDL

µF

DDL

Output Capacitor ESR (Note 12)

ESR

VDDL

0.125

KEEP-ALIVE (STANDBY) REGULATOR V

KAM

KAM

Output Voltage

VKAM

= 5.0 mA, VPWR = KA_V

PWR

= 18 V, EN = 5.0 V

KAM

2.5

2.7

KAM

Output Voltage, EN = 0 V (Standby Mode)

PWR

= KA_V

PWR

= 26 V, I

VKAM

= 0.5 mA

PWR

= KA_V

PWR

= 18 V, I

VKAM

= 5.0 mA

PWR

= KA_V

PWR

= 5.0 V, I

VKAM

= 10.0 mA

PWR

= 0 V, KA_V

PWR

= 3.5 V, I

VKAM

= 5.0 mA

KAM

2.5

2.0

2.7

KAM

Line Regulation, EN = 0 V (Standby Mode)

PWR

= KA_V

PWR

= 5.0 V to 18 V, I

VKAM

= 2.0 mA

RegLn

VKAM

-20

KAM

Load Regulation, EN = 0 V (Standby Mode)

PWR

= KA_V

PWR

= 14 V, I

VKAM

= 1.0 mA to 10 mA

RegLd

VKAM

100

Differential Voltage V

KAM

- V

DDL

EN = 5.0 V, I

VKAM

= 5.0 mA, V

PWR

= KA_V

PWR

= 14 V, I

VDDL

= 200 mA

Reg

VKAM

-20

KAM

Output Capacitor Capacitance (Note 12)

VKAM

4.7

µF

KAM

Output Capacitor ESR (Note 12)

ESR

VKAM

1.4

Notes

12.

Recommended value.

33998

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

Characteristic

Symbol

Min

Typ

Max

Unit

SENSOR SUPPLIES V

REF1

, V

REF2

REF

On-Resistance, T

= -40°C

VREF

= 200 mA, I

VDDH

= 200 mA, V

PWR

= KA_V

PWR

= 14 V, EN = 5.0 V

DS(on)

280

REF

On-Resistance, T

= +25°C

VREF

= 200 mA, I

VDDH

= 200 mA, V

PWR

= KA_V

PWR

= 14 V, EN = 5.0 V

DS(on)

350

REF

On-Resistance, T

= +125°C

VREF

= 200 mA, I

VDDH

= 200 mA, V

PWR

= KA_V

PWR

= 14 V, EN = 5.0 V

DS(on)

455

REF

Short-to-Battery Detect Current

PWR

= KA_V

PWR

= 14 V, EN = 5.0 V, SNSEN = 5.0 V

SC_Bat

500

900

REF

Short-to-Ground Detect Current

PWR

= KA_V

PWR

= 14 V, EN = 5.0 V, SNSEN = 5.0 V

SC_Gnd

500

900

Maximum Output Capacitance (Total) (Note 13)

VREF

SUPERVISORY CIRCUITS

PWROK Undervoltage Threshold on V

DDL

, FBL Ramps Down

PWR

= KA_V

PWR

= 14 V, I

VDDH

= 200 mA

FBL(thL)

2.1

2.4

2.5

PWROK Undervoltage Threshold on V

DDH

PWR

= KA_V

PWR

= 14 V, I

VDDH

= 200 mA

DDH(thL)

4.5

4.8

DDH

Overvoltage Threshold

PWR

= KA_V

PWR

= 10 V, I

VDDH

= 200 mA

DDH(thH)

5.12

5.7

PWROK Open Drain On-Resistance

PWR

= KA_V

PWR

= 14 V, EN = 5 V, I

PwrOK

= 5.0 mA

DS(on)

200

VKAMOK Threshold,

PWR

= KA_V

PWR

= 14 V, I

VDDH

= 200 mA

KAM(thL)

2.1

2.4

2.5

VKAMOK Threshold on V

PWR

, V

PWR

Ramps Up

KA_V

PWR

= 14 V, I

VDDH

= 200 mA

PWRok(th)

4.0

5.0

VKAMOK Open Drain On-Resistance

PWR

= KA_V

PWR

= 14 V, EN = 0 V, I

VKAMOK

= 10 mA

DS(on)

200

Enable Input Voltage Threshold (Pin EN)

1.0

2.0

Enable Pull-Down Current (Pin EN), EN = 1.0 V V

DDH

to V

IL(min)

500

1200

Sensor Enable Input Voltage Threshold (Pin SNSEN)

1.0

2.0

Sensor Enable Pull-Down Current (Pin SNSEN)

SNSEN = 1.0 V V

DDH

to V

IL(min)

500

1200

Notes

13.

Recommended value.

STATIC ELECTRICAL CHARACTERISTICS (continued)
Characteristics noted under conditions 9.0 V

PWR

16 V, -40

°C

= T

125

°C, using the typical application circuit (see

Figure 8

) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T

= 25

°C under nominal

conditions unless otherwise noted.

33998

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 9.0 V

PWR

16 V, -40

°C

= T

125

°C using the typical application circuit (see

Figure 8

) unless otherwise noted. Typical values noted reflect the approximate parameter mean at T

= 25

°C under nominal

conditions unless otherwise noted.

Characteristic

Symbol

Min

Typ

Max

Unit

BUCK REGULATOR V

DDH

Switching Frequency (Note 14)

750

kHz

Soft Start Duration (see

Figure 2

)

PWR

= KA_V

PWR

= 6.0 V

5.0

CHARGE PUMP C

RES

Charge Pump Current Ramp-Up Time

PWR

= KA_V

PWR

= 14 V, C

RES

= 22 nF, V

= 1.0 V to 11 V

CRES

1.0

Charge Pump Ramp-Up Time

PWR

= KA_V

PWR

= 7.0 V, C

RES

= 22 nF, V

= 7.0 V to 10 V

CRES

1.0

SENSOR SUPPLIES V

REF1

, V

REF2

REF

Overcurrent Detection Time (see

Figure 3

)

REF

Load R

= 5.0

to GND, V

DDH

= 5.1 V, V

PWR

= KA_V

PWR

= 10 V,

EN = 5.0 V, SNSEN = 5.0 V

Det

0.5

2.0

µs

REF

Retry Timer Delay (see

Figure 3

)

REF

Load R

= 5.0

to GND, V

DDH

= 5.1 V, V

PWR

= KA_V

PWR

= 10 V,

EN = 5.0 V, SNSEN = 5.0 V

Ret

5.0

SUPERVISORY CIRCUITS

PWROK Delay Time (Power-On Reset) (see

Figure 4

)

D(PWROK)

5.0

VKAMOK Delay Time (see

Figure 5

)

D(VKAMOK)

DDH

Power-Up Delay Time (see

Figure 6

)

D(VPWR)

1.0

Fault-Off Timer Delay Time (see

Figure 7

)

Fault

1.0

Notes

14.

Guaranteed by design but not production tested.

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33998

SYSTEM/APPLICATION INFORMATION

INTRODUCTION

The 33998 multi-output power supply integrated circuit is

capable of operating from 6.0 V up to 26.5 V with 40 V transient
capability. It incorporates a step-down switching controller
regulating directly to 5.0 V. The 2.6 V linear regulator uses an
external pass transistor, thus reducing the power dissipation of

the integrated circuit. The 33998 also provides a 2.6 V linear
standby regulator and two 5.0 V sensor supply outputs
protected by internal low-resistance LDMOS transistors
against short-to-battery and short-to-ground.

FUNCTIONAL PIN DESCRIPTION

Switching Regulator V

DDH

The switching regulator is a high-frequency (750 kHz),

conventional buck converter with integrated high-side p-
channel power MOSFET. Its output voltage is regulated to
provide 5.0 V with ±2% accuracy and it is intended to directly
power the digital and analog circuits of the Electronic Control
Module (ECM). The switching regulator output is rated for
1400 mA total output current. This current can be used by the
linear regulator V

DDL

and sensor supplies V

REF1

and V

REF2

The 33998 switching controller utilizes "Sensorless Current
Mode Control" to achieve good line rejection and stabilize the
feedback loop. A soft-start feature is incorporated into the
33998. When the device is enabled, the switching regulator
output voltage V

DDH

ramps up to about half of full scale and

then takes 16 steps up to the nominal regulation voltage level
(5.0 V nominal).

2.6 V Linear Regulator V

DDL

The 2.6 V linear post-regulator is powered from the 5.0 V

switching regulator output (V

DDH

). A discrete pass transistor is

used to the power path for the V

DDL

regulator. This

arrangement minimizes the power dissipation off the controller
IC. The FBL pin is the feedback input of the regulator control
loop and the DRVL pin the external NPN pass transistor base
drive. Power up, power down, and fault management are
coordinated with the 5.0 V switching regulator.

Sensor Supplies V

REF1

and V

REF2

The sensor supplies are implemented using a protected

switch to the main 5.0 V (switching regulator) output. The
33998 integrated circuit provides two low-resistance LDMOS
power MOSFETs connected to the switching regulator output
(V

DDH

). These switches have short-to-battery and short-to-

ground protection integrated into the IC. When a severe fault
conditions is detected, the affected sensor output is turned off
and the sensor Retry Timer starts to time out. After the Retry
Timer expires, the sensor supply tries to power up again.
Sensor supplies V

REF

can be disabled by pulling the Sensor

Enable SNSEN pin low (see

Figure 7

for the V

REF

Retry Timer

operation).

Notes: Severe fault conditions on the V

REF1

and V

REF2

outputs, like hard shorts to either ground or battery, may disrupt
the operation of the main regulator V

DDH

. Shorts to battery

above 17 V are considered "double faults" and neither one of
the V

REF

outputs is protected against such conditions.

Depending on the V

DDH

capacitor value and its ESR value,

the severity of the short may disrupt the V

DDH

operation.

Keep-Alive (Standby) Regulator V

KAM

The Keep-Alive Regulator V

KAM

(keep-alive memory) is

intended to provide power for "key off" functions such as
nonvolatile SRAM, "KeyOff" timers and controls, KeySwitch
monitor circuits, and perhaps a CAN/SCP monitor and wake-
up function. It may also power other low-current circuits
required during a "KeyOff" condition. The regulated voltage is
nominally 2.6 V. A severe fault condition on the V

KAM

output is

signaled by pulling the VKAMOK signal low.

KAM

Keep-Alive Operation (Standby, Power-Down

Mode)

When the EN pin is pulled low, the power supply is forced

into a low-current standby mode. In order to reduce current
drawn by the V

PWR

and KA_V

PWR

pins, all power supply

functions are disabled except for the V

KAM

and Enable (EN)

pins. The latter pin is monitored for the "wake-up" signal. The
switching transistor gate is actively disabled and the V

DDL

and

DDH

pins are actively pulled low.

Power-Up Delay Timers

Two Power-Up Delay timers are integrated into the control

section of the integrated circuit. One timer monitors the input
voltage at the V

PWR

input pin (see

Figure 3

), and the other

monitors the input voltage at the KA_V

PWR

input pin

In both

cases, sufficient supply voltage must be present long enough
for the timers to "time out" before the switching regulator can be
enabled.

Fault-Off Timer

If the V

DDL

output voltage does not reach its valid range at

the end of soft-start period, or if the V

DDH

or V

DDL

output

voltage gets below its PWROK threshold level, the Fault-Off
Timer shuts the switching regulator off until the timer "times
out" and the switching regulator retries to power up again (see

Figure 7

for Fault-Off Timer operation details).

33998

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

Power-On Reset Timer

This timer starts to time out at the end of the soft-start period

if the V

DDH

and V

DDL

outputs are in the valid regulation range.

If the timer "times out", then the open-drain PWROK signal is
released, indicating that "power is ON".

Supervisory Circuits PWROK and VKAMOK

The 33998 has two voltage monitoring open-drain outputs,

the PWROK and the VKAMOK pins. PWROK is "active high".
This output is pulled low when either of the regulator outputs

DDH

or V

DDL

) are below their regulation windows. If both

regulator outputs are above their respective lower thresholds,
and the Power-On Reset Timer has expired, the output driver is
turned off and this pin is at high-impedance state (see

Figure 6

The VKAMOK signal indicates a severe fault condition on

the keep-alive regulator output V

KAM

. The V

KAM

output voltage

is compared to the internal bandgap reference voltage. When
the V

KAM

falls below the bandgap reference voltage level, the

VKAMOK signal is pulled low.

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33998

APPLICATIONS

Figure 8. 33998 Application Circuit Schematic Diagram

Table 1. Recommended Components

Designator

Value/Rating

Description/Part No.

Manufacturer (Note 16)

Cf1

10 µF/50 V

Aluminum Electrolytic/UUB1H100MNR

Nichicon

Cf2, C2

1.0 µF/50 V

Ceramic X7R/C1812C105K5RACTR

Kemet

100 µF/50 V

Aluminum Electrolytic/UUH1V101MNR

Nichicon

C3 (Note 15)

68 µF/10 V

Tantalum/T494D686M010AS

Kemet

68 µF/10 V

Tantalum/T494D686M010AS

Kemet

4.7 µF/10 V

Tantalum/T494A475M010AS

Kemet

C4, C5

100 nF/16 V

Ceramic X7R

Any Manufacturer

C8 (Optional)

390 pF/50 V

Ceramic X7R

Any Manufacturer

22 nF/25 V

Ceramic X7R

Any Manufacturer

Notes

15.

It is possible to use ceramic capacitors in the switcher output, e.g. C3 = 2 x 22 µF/6.3 V X7R ceramic. In this case the compensation resistor
has to be changed to Rc1 = 200

to stabilize the switching regulator operation.

16.

Motorola does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or
tables. While Motorola offers component recommendations in this configuration, it is the customer's responsibility to validate their application.

Note The V

DDH

total output current is 1.4 A. This includes the current used by the linear regulator V

DDL

and buffered outputs V

REF1

and

REF2

SNSEN

VPW R

KA _V PWR

G ND

3 399 8

VSW

VDDH

DRVL

FB L

PW ROK

VKAM

VKAMOK

Vbg

VREF1

VREF2

I-lim

Ramp

O sc

Soft

St art

Logic

Latch

PwrO K

VkamO K

P OR

2. 6V

Linear

Regulat or

Driver

2.6V

St and by

Reg .

Ba ndgap

Voltage

Referen ce

Ch arge

Pump

VREF1

Re g.

VREF2

Re g.

Vbg

CRES

VSUM

FBKB

Enable

Control

En b

Snsenb

E nb

Enb

Retry

Drive

22n F

Cs1

33 nF

Lf1

10uH

1.0uF

100uF

Cf 2

1.0uF

10 uF

Cf1

Cs2

33nF

68uF

1 00n F

100nF

68uF

15uH

4 .7 uF

1 0k

10k

Q 1

Rc1

3.6k

Cc1

2.2nF

Dp1

Dp 2

5-8

17 -20

VDDL = 2.6V

@ 40 0mA

VKAM = 2.6V

@ 10mA

VDDH = 5.0V

@ 1400mA total

390 pF

2 .2 R

O pt io nal
Snubber

33998

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

Cs1, Cs2

33 nF/25 V

Ceramic X7R

Any Manufacturer

Cc1

2.2 nF/16 V

Ceramic X7R

Any Manufacturer

R1, R2

10 k

Resistor 0805, 5%

Any Manufacturer

R3 (Optional)

2.2

Resistor 0805, 5%

Any Manufacturer

Rc1

3.6 k

Resistor 0805, 5%

Any Manufacturer

Lf1

10 µH

CDRH127-100M

or SLF10145-100M2R5

Sumida

TDK

15 µH

CDRH127-150MC

or SLF10145-150M2R2

Sumida

TDK

1.0 A/20 V

Bipolar Transistor/BCP68T1

ON Semiconductor

2.0 A/50 V

Schottky Diode/SS25

General Semiconductor

Dp1

3.0 A/200 V

Diode/MURS320

ON Semiconductor

Dp2

27 V

Transient Voltage Suppressor/SM5A27

General Semiconductor

Notes

17.

Designator

Value/Rating

Description/Part No.

Manufacturer (Note 16)

(Note 17)

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

33998

PACKAGE DIMENSIONS

NOTES:

DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

CONTROLLING DIMENSION: MILLIMETER.

DIMENSIONS A AND B DO NOT INCLUDE MOLD

PROTRUSION.

MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER

SIDE.

DIMENSION D DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN

EXCESS OF D DIMENSION AT MAXIMUM MATERIAL

CONDITION.

-A-

-B-

12X

24X

0.010 (0.25)

-T-

22X

SEATING

PLANE

X 45

DIM

MIN

MAX

MIN

MAX

INCHES

MILLIMETERS

15.25

15.54

0.601

0.612

7.40

7.60

0.292

0.299

2.35

2.65

0.093

0.104

0.35

0.49

0.014

0.019

0.41

0.90

0.016

0.035

1.27 BSC

0.050 BSC

0.23

0.32

0.009

0.013

0.13

0.29

0.005

0.011

10.05

10.55

0.395

0.415

0.25

0.75

0.010

0.029

DW SUFFIX

24-LEAD SOIC WIDE BODY

PLASTIC PACKAGE

CASE 751E-04

ISSUE E

Information in this document is provided solely to enable system and software implementers to use Motorola products. There are no express or implied
copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document.

Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee
regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product
or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be
provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating
parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license
under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for
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