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General Description
The MAX886/MAX888 power-management ICs are com-
plete power systems for wireless and satellite handsets.
The devices operate from 3 to 6-cell NiCd/NiMH batter-
ies or from 1 or 2-cell Li-Ion batteries. They incorporate a
high-efficiency, step-down DC-DC converter, a regulated
5V charge pump, and four linear regulators. The regula-
tors supply power to the SIM, LCD, BB, DSP, and RF
sections of a cellular telephone handset. The step-down
converter and linear regulator outputs are adjustable by
internal 4-bit DACs, programmable through the I
2
CTM-
compatible serial interface. A pushbutton on/off scheme
activates a 5A low-power shutdown mode. The devices
also feature a low-battery detector output and an internal
start-up timer.
The MAX886/MAX888 differ in output voltage range and
power-on reset voltage. The MAX886 has a higher preset
voltage range and is intended for 2-cell Li-Ion or 5/6-cell
NiCd/NiMH batteries. The MAX888 has a lower preset
voltage range and is intended for 1-cell Li-Ion or 3/4-cell
NiCd/NiMH batteries. Both devices are available in a
space-saving, 32-pin TQFP package.
Applications
Satellite Phones
Private Mobile Radio (PMR)
Wireless Handsets
GSM Cellular/PCS Telephones
Features
o
90% Efficient, 500mA Step-Down Converter
o
Two 100mA DAC-Controlled LDOs
One 200mA DAC-Controlled LDO
One 20mA DAC-Controlled LDO
o
3 to 6-Cell NiCd or NiMH Operation
1 or 2-Cell Li-Ion Operation
o
+2.7V to +12V Input Voltage Range
o
250A Standby (PFM) Quiescent Current
o
5A Shutdown Current
o
I
2
C-Compatible Serial Interface
o
Selectable 375kHz, 535kHz, 670kHz, 925kHz
(or Synchronizable) Switching Frequency
o
Power-On Reset and Start-Up Timer
o
Thermal Overload Protection
o
Pushbutton On/Off Control
o
Space-Saving 32-Pin TQFP Package (7mm x 7mm)
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
________________________________________________________________
Maxim Integrated Products
1
BATT
LBO
SCL
SDA
LBI
IN
2.7V TO 12V
I
2
C-COMPATIBLE
SERIAL INTERFACE
LOW-BATTERY
DETECT
ON/OFF CONTROL
(OPTIONAL)
LX
MAIN POWER (UP TO 500mA)
PGND
OUT0
Tx SECTION POWER (UP TO 100mA)
DSP POWER (UP TO 200mA)
3V/5V SIM CARD POWER (UP TO 20mA)
LCD/VCO/TXCO POWER (UP TO 100mA)
POWER-ON RESET
Rx SECTION POWER (UP TO 100mA)
OUT1
MAX886
MAX888
OUT2
RESET
OUT3
OUT4
OUT5
ONSTAT
GND
OFF
SYNC
C+
C-
ON
ON STATUS
19-1438; Rev 0; 3/99
PART
MAX886
ECJ*
MAX888
ECJ
-40C to +85C
-40C to +85C
TEMP. RANGE
PIN-PACKAGE
32 TQFP
32 TQFP
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
*
Future product--contact factory for availability.
Typical Operating Circuit
Ordering Information
Pin Configuration appears at end of data sheet.
I
2
C is a trademark of Philips Corp.
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
BATT, IN0, IN1 to GND...........................................-0.3V to +13V
CVH to IN0................................................................-6V to +0.3V
PGND, DGND to GND...........................................-0.3V to +0.3V
ONSTAT to GND .....................................-0.3V to (V
OUT2
+ 0.3V)
LX to PGND.............................................-0.3V to (V
OUT0
+ 0.3V)
OUT1 to GND.............................................-0.3V to (V
IN1
+ 0.3V)
OUT2 to GND.............................................-0.3V to (V
IN2
+ 0.3V)
OUT3 to GND.............................................-0.3V to (V
IN3
+ 0.3V)
OUT5 to GND.............................................-0.3V to (V
IN5
+ 0.3V)
SYNC, RESET, SCL, SDA, CVL, LBI, LBHYS, OUT0
REF, LBO, C+, C-, OUT4, IN2, IN3, IN4, IN5,
ON, OFF to GND ...................................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70C)
TQFP (derate 11.1mW/C above +70C) ......................889mW
Operating Temperature Range. ......................... -40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
V
OUT0
= 3.75V (MAX886),
V
OUT0
= 2.027V (MAX888)
MAX888
MAX886
I
OUT0
= 0
2.7V < V
OUT0
< 3.75V
f
OSC
= 375kHz
1A < I
REF
< 100A
I
REF
= 0
SYNC = GND
V
BATT
falling
V
BATT
rising
CONDITIONS
% of
V
OUT0
Output Ready Threshold
-7.5
-5
-3
V
1.527
3.027
V
OUT0
Nominal Output Adjustment
Range
2.625
3.750
%
-3
3
Output Accuracy
V
2.7
12
V
IN0
Input Voltage Range
mV
0.2
5
Reference Supply Rejection
mV
5
15
Reference Load Regulation
V
1.225
1.275
V
REF
Reference Output Voltage
1.23
1.25
1.27
V
2.7
5.5
V
IN2
, V
IN3
,
V
IN4
, V
IN5
IN2, IN3, IN4, IN5 Operating
Voltage Range
V
2.7
12
V
BATT
, V
IN0
,
V
IN1
BATT, IN0, IN1 Operating Voltage
Range
5
10
2
A
250
600
I
BATTPFM
Supply Current, PFM Mode
V
2.35
2.45
V
UVLOF
V
2.55
2.65
V
UVLOR
Undervoltage Lockout
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
OFF = GND
A
15
I
STNBY
Supply Current, Shutdown Mode
T
A
= 0C to +85C
T
A
= -40C to +85C
T
A
= 0C to +85C
T
A
= -40C to +85C
f
OSC
= 535kHz
3
f
OSC
= 670kHz
f
OSC
= 925kHz
mA
5.5
12
I
BATTPWM
Supply Current, PWM Mode
4
REFERENCE
DC-DC BUCK REGULATOR 0 (IN0, OUT0)
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
I
OUT1
= 0.1mA to 100mA
Table 4
I
OUT0
V
IN0
= 3.8V
CONDITIONS
%
-3
3
Output Accuracy
V
2.7
12
V
IN1
Input Voltage Range
%
-23
23
f
OSC
Oscillator Frequency Accuracy
-20
20
A
0.6
0.9
1.2
I
LIMIT
Internal Switch Current Limit
mA
63
98
180
PFM to PWM Threshold
0.4
1
R
ON
Internal Switch On-Resistance
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
OUT2
= 3.3V (MAX886),
V
OUT2
= 1.527V (MAX888)
MAX888
MAX886
I
OUT2
= 0.1mA to 200mA
3V < V
IN1
< 12V, 0h code
I
OUT1
= 0.1mA to 100mA
I
OUT1
= 100mA
I
OUT1
= 1mA
MAX888
MAX886
V
1.527
3.027
V
OUT2
Nominal Output Adjustment
Range
2.175
3.30
%
-3
3
Output Accuracy
V
2.7
5.5
V
IN2
Input Voltage Range
mA
100
250
Current Limit
%/V
-0.1
0
0.1
Line Regulation
%/mA
-0.01
0.01
Output Load Regulation
mV
90
200
Dropout Voltage
1
V
1.25
3.5
V
OUT1
Nominal Output Adjustment
Range
2.70
4.95
2.7V < V
IN2
< 3.8V, 0h code
I
OUT2
= 0.1mA to 200mA
I
OUT2
= 200mA
I
OUT2
= 1mA
mA
200
500
Current Limit
%/V
-0.3
0.3
Line Regulation
%/mA
-0.005
0.002
Output Load Regulation
90
200
Dropout Voltage
mV
1
% of
V
OUT2
-7.5
-5
-3
V
RDY2
Output Ready Threshold
I
OUT3
= 0.1mA to 20mA
%
-3
3
Output Accuracy
V
2.7
5.5
V
IN3
Input Voltage Range
kHz
0.8
f
OSC
1.2
f
OSC
f
OSC
SYNC Range
T
A
= 0C to +85C
T
A
= -40C to +85C
V
LX
= 12V
A
0.1
10
LX Leakage Current
V
LX
= 12V
%
100
Maximum Duty Cycle
3V < V
IN0
< 12V
%
-0.3
0
0.3
Line Regulation
I
OUT0
= 0.1mA to 500mA
%
-1.5
Output Load Regulation
OSCILLATOR FREQUENCY (OUT0, OUT4)
LDO REGULATOR 1 (IN1, OUT1)
LDO REGULATOR 2 (IN2, OUT2)
LDO REGULATOR 3 (IN3, OUT3)
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
I
OUT5
= 1mA
MAX886
I
OUT5
= 0.1mA to 100mA
No load
V
OUT3
= 2.85V or 4.65V only
3.8V < V
IN3
< 5.5V, V
OUT3
= 2.85V
CONDITIONS
1
V
2.175
3.300
V
OUT5
Nominal Output Adjustment
Range
%
-3
3
Output Accuracy
V
2.7
5.5
V
IN5
Input Voltage Range
V
5.10
5.25
5.41
V
OUT4
Output Voltage
kHz
f
OSC
/ 2
Switching Frequency
mA
20
50
Current Limit
%/V
-0.3
0.3
Line Regulation
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
LBI
= step from 1.23V to 1.27V
V
LBI
= 1.23V
2.7V < V
IN5
< 3.8V, 0h code
I
OUT5
= 0.1mA to 100mA
I
OUT5
= 100mA
s
10
LBI Propagation Delay
A
-0.2
0.2
LBI Input Current
mA
100
250
Current Limit
%/V
-0.3
0.3
Line Regulation
%/mA
-0.01
0.01
Output Load Regulation
mV
72
200
Dropout Voltage
0.4
V
IL
ms
28
37
47
Start-Up Timeout Period
ms
56
75
94
Reset Timeout Period
V
1.2
V
IH
ON Input Voltage
V
LBO
= I
LBHYS
= 1mA,
V
LBI
= V
REF
- 15mV
V
0.5
LBO/LBHYS Output Low Voltage
V
LBO
= V
LBHYS
= 12V,
V
LBI
= V
REF
+ 15mV
A
-0.2
0.2
LBO/LBHYS Leakage Current
V
V
REF
-
V
REF
V
REF
+
15mV
15mV
LBI Threshold
MAX888
1.25
3.50
5.21
I
OUT4
= 50mA
I
OUT3
= 0.1mA to 20mA
%/mA
-0.035
0.02
Output Load Regulation
I
OUT3
= 20mA
20
50
I
OUT3
= 1mA
mV
1
Dropout Voltage
V
OUT2
4.65
2.85
V
IN3
= 5.5V,
Table 5
V
0
V
OUT3
Nominal Output Voltage
CHARGE-PUMP REGULATOR 4 (IN4, OUT4)
LDO REGULATOR 5 (IN5, OUT5)
LOW-BATTERY COMPARATOR
RESET AND START-UP TIMER
LOGIC AND CONTROL INPUTS
MAX886/MAX888
Wireless and Satellite Handset
Power-Management ICs
_______________________________________________________________________________________
5
Note 1:
Specifications to -40C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(V
BATT
= V
IN0
= V
IN1
= +5.5V, GND = PGND = DGND, V
OFF
= V
SYNC
= 2.8V, V
IN2
= V
IN3
= V
IN4
= V
IN5
= +3.8V, V
OUT4
= +5.5V,
T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
I
RESET
= 0,
internal 10k
pull-up resistor to OUT2
I
RESET
= 1mA
1.2V < V
ON
< V
OUT2
CONDITIONS
s
0.6
t
HIGH
SCL High Period
s
1.3
t
LOW
SCL Low Period
kHz
400
f
SCL
SCL Clock Frequency
C
160
Threshold Temperature
V
V
OUT2
-
0.5
V
RESETH
Output High Voltage
V
0.5
V
RESETL
Output Low Voltage
A
ON Input Current
-16
-40
I
IL
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
I
SDA
= 3mA
0.4
0.6
V
IL
s
0
0.9
t
DHOLD
Data Hold Time
ns
100
t
DSU
Data Set-Up Time
I
SDA
= 6mA
V
0.6
SDA Output Low Voltage
V
1.4
V
IH
OFF, SDA, SCL Input Voltage
V
LBO
= V
LBHYST
= 12V,
V
LBI
= V
REF
+ 15mV
A
-0.2
0.2
LBO, LBHYS Leakage Current
0 < V
ILH
< V
OUT2
1
I
ILH
A
OFF, SDA, SCL Input Current
I
ONSTAT
= 0
ONSTAT Output Voltage
V
V
OUT2
-
0.5
V
ONSTATH
V
SYNC Input Voltage
0.8
V
IL
-5
-10
I
IH
2.0
V
IH
0 < V
SYNC
< V
OUT2
A
SYNC Input Current
0.25
1
I
SYNC
I
ONSTAT
= 1mA
V
ONSTAT Output Voltage
0.5
V
ONSTATL
V
ON
= 0
ONSTAT OUTPUT
RESET
OUTPUT
THERMAL SHUTDOWN
I
2
C-COMPATIBLE SERIAL INTERFACE
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