FN9166

ISL6292D

Li-ion/Li Polymer Battery Charger

The ISL6292D is an integrated single-cell Li-ion or
Li-polymer battery charger capable of operating with an input
voltage as low as 2.4V. This charger is designed to work with
various types of ac adapters or a USB port.

The ISL6292D operates as a linear charger when the ac
adapter is a voltage source. The battery is charged in a
CC/CV (constant current/constant voltage) profile. The
charge current is programmable up to 2A. The ISL6292D
can also work with a current-limited adapter to minimize the
thermal dissipation, in which case the ISL6292D combines
the benefits of both a linear charger and a pulse charger.

The ISL6292D features charge current thermal foldback to
guarantee safe operation when the printed circuit board is
space limited for thermal dissipation. Additional features
include preconditioning of an over-discharged battery, an
NTC thermistor interface for charging the battery in a safe
temperature range, automatic recharge, and thermally
enhanced QFN package.

Features

· Complete Charger for Single-Cell Li-ion Batteries

· Integrated Pass Element and Current Sensor

· No External Blocking Diode Required

· Very Low Thermal Dissipation

· Two-Speed Blinking Indication at Fault Conditions

· 1% Voltage Accuracy

· Programmable Current Limit up to 2A

· Programmable End-of-Charge Current

· Charge Current Thermal Foldback

· NTC Thermistor Interface for Battery Temperature Monitor

· Accepts Multiple Types of Adapters or USB BUS

Power

· Guaranteed to Operate at 2.65V After Start Up

· Ambient Temperature Range: -20°C to 70°C

· Thermally-Enhanced QFN Packages

· QFN Package:

- Compliant to JEDEC PUB95 MO-220

QFN - Quad Flat No Leads - Package Outline

- Near Chip Scale Package footprint, which improves

PCB efficiency and has a thinner profile

· Pb-free Available

Applications

· Handheld Devices including Medical Handhelds

· PDAs, Cell Phones and Smart Phones

· Portable Instruments, MP3 Players

· Self-Charging Battery Packs

· Stand-Alone Chargers

· USB Bus-Powered Chargers

Related Literature

· Technical Brief TB363 "Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices
(SMDs)"

· Technical Brief TB379 "Thermal Characterization of

Packaged Semiconductor Devices"

· Technical Brief TB389 "PCB Land Pattern Design and

Surface Mount Guidelines for QFN Packages"

Ordering Information

PART #

TEMP.

RANGE (°C)

PACKAGE

PKG.

DWG. #

ISL6292DCR4

-20 to 70

16 Ld 4x4 QFN

L16.4x4

ISL6292DCR4-T 16 Ld 4x4 QFN Tape and Reel

ISL6292DCRZ
(Note)

-20 to 70

16 Ld 4x4 QFN (Pb-free) L16.4x4

ISL6292DCRZ-T
(Note)

16 Ld 4x4 QFN Tape and Reel (Pb-free)

NOTE: Intersil Pb-free products employ special Pb-free material
sets; molding compounds/die attach materials and 100% matte tin
plate termination finish, which is compatible with both SnPb and
Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J Std-020B.

Pinout

ISL6292D (16 LEAD QFN)

TOP VIEW

VIN

STAT2

STAT1

TIME

VIN

BAT

14 13

VBAT

TEMP

IMIN

IREF

GND

TOEN

Data Sheet

July 2004

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

Absolute Maximum Ratings

Thermal Information

Supply Voltage (VIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to 7V
Output Pin Voltage (VBAT) . . . . . . . . . . . . . . . . . . . . . . -0.3 to 5.5V
Signal Input Voltage (TOEN, TIME, IREF, IMIN) . . . . . . -0.3 to 3.2V
Output Pin Voltage (STAT1, STAT2) . . . . . . . . . . . . . . . . . -0.3 to 7V
Charge Current (For 4x4 QFN Package) . . . . . . . . . . . . . . . . . 2.1A
ESD Rating

Human Body Model (Per MIL-STD-883 Method 3015.7) . . .1500V
Machine Model (Per EIAJ ED-4701 Method C-111). . . . . . . .150V

Recommended Operating Conditions

Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-20°C to 70°C
Supply Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3V to 6.5V

Thermal Resistance (Note 1)

(°C/W)

QFN Package (Notes 1, 2). . . . . . . . . . .

Maximum Junction Temperature (Plastic Package) . . . . . . . . 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
For recommended soldering conditions, see Tech Brief TB389.

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

is measured in free air with the component mounted on a high effective thermal conductivity test board with "direct attach" features. See

Tech Brief TB379.

, "case temperature" location is at the center of the exposed metal pad on the package underside. See Tech Brief TB379.

Electrical Specifications

Typical values are tested at VIN = 5V and 25°C Ambient Temperature, maximum and minimum values are
guaranteed over 0°C to 70°C Ambient Temperature with a supply voltage in the range of 4.3V to 6.5V, unless
otherwise noted.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

POWER-ON RESET

Rising VIN Threshold

POR

3.0

3.5

4.0

Falling VIN Threshold (Note 3)

POR

2.25

2.4

2.65

STANDBY CURRENT

VBAT Pin Sink Current

STANDBY

VIN floating or EN = LOW

3.0

µA

VIN Pin Supply Current

VIN

VBAT floating and EN pulled low

µA

VIN Pin Supply Current

VIN

VBAT floating and EN floating

VOLTAGE REGULATION

Output Voltage

4.158

4.20

4.242

Dropout Voltage

VBAT = 3.7V, 0.5A

140

CHARGE CURRENT

Constant Charge Current (Note 4)

CHARGE

IREF

= 80k

, V

BAT

= 3.7V

0.9

1.0

1.1

Trickle Charge Current

TRICKLE

IREF

= 80k

, V

BAT

= 2.0V

110

Constant Charge Current

CHARGE

IREF Pin Voltage > 1.3V, V

BAT

= 3.7V

400

450

500

Trickle Charge Current

TRICKLE

IREF Pin Voltage > 1.3V, V

BAT

= 2.0V

Constant Charge Current

CHARGE

IREF Pin Voltage < 0.4V, V

BAT

= 3.7V

100

Trickle Charge Current

TRICKLE

IREF Pin Voltage < 0.4V, V

BAT

= 2.0V

End-of-Charge Threshold

IMIN

= 80k

110

135

RECHARGE THRESHOLD

Recharge Voltage Threshold Below V

RECHRG

The threshold in relative to V

-200

-80

Recharge Voltage Threshold

RECHRG

3.85

4.0

TRICKLE CHARGE THRESHOLD

Trickle Charge Threshold Voltage

MIN

2.56

2.76

3.0

ISL6292D

TEMPERATURE MONITORING

Low Battery Temperature Threshold

TMIN

V2P8 = 3.0V

1.40

1.50

1.60

Low Temperature Threshold Hysteresis

V2P8 = 3.0V

214

High Battery Temperature Threshold

TMAX

V2P8 = 3.0V

.587

0.605

.623

High Temperature Threshold Hysteresis

V2P8 = 3.0V

Battery Removal Threshold

RMV

V2P8 = 3.0V

2.25

Charge Current Foldback Threshold (Note 5)

FOLD

100

115

°C

Current Foldback Gain (Note 5)

FOLD

100

mA/°C

OSCILLATOR

Oscillation Period

OSC

TIME

= 15nF

2.4

3.0

3.6

LOGIC INPUT AND OUTPUT

TOEN Input High

2.0

TOEN and EN Input Low

0.8

IREF and IMIN Input High

1.2

IREF and IMIN Input Low

0.4

STAT1/STAT2 Sink Current

Pin Voltage = 0.8V

NOTES:

3. The POR falling edge voltage is guaranteed to be lower than the Trickle Charge Threshold Voltage (V

MIN

) by actual tests.

4. The actual charge current may be affected by the thermal foldback function if the thermal dissipation capability is not enough or by the on

resistance of the power MOSFET if the charger input voltage is too close to the output voltage.

5. Guaranteed by design, not a tested parameter.

Electrical Specifications

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

ISL6292D

Pin Description

VIN (Pin 1, 15, 16)

VIN is the input power source. Connect to a wall adapter.

STAT2 (Pin 2)

STAT2 is an open-drain output to indicate the charger status.
This pin is pulled to LOW during charging and to HIGH when
not charging. When a fault situation occurs, the pin outputs a
one-speed blinking indication.

STAT1 (Pin 3)

STAT1 is an open-drain output to indicate the charger status.
The STAT1 pin is pulled LOW when the charger is charging
a battery and to HIGH when the charge finishes. This pin
outputs two different speeds of blinking signal depending on
the type of the fault case.

TIME (Pin 4)

The TIME pin determines the oscillation period by
connecting a timing capacitor between this pin and GND.
The oscillator also provides a time reference for the charger.

GND (Pin 5)

GND is the connection to system ground.

TOEN (Pin 6)

TOEN is the TIMEOUT enable input pin. Pulling this pin to
LOW disables the TIMEOUT charge-time limit for the fast
charge modes. Leaving this pin HIGH or floating enables the
TIMEOUT limit.

EN (Pin 7)

EN is the enable logic input. Connect the EN pin to LOW to
disable the charger or leave it floating to enable the charger.

V2P8 (Pin 8)

This is a 2.8V reference voltage output. This pin outputs a
2.8V voltage source when the input voltage is above POR
threshold and outputs zero otherwise. The V2P8 pin can be
used as an indication for adapter presence. Use a 1

µF

ceramic capacitor to stabilize the internal linear regulator.

IREF

(Pin 9)

This is the programming input for the constant charging
current.

IMIN (Pin 10)

IMIN is the programmable input for the end-of-charge
current.

TEMP (Pin 11)

TEMP is the input for an external NTC thermistor. The TEMP
pin is also used for battery removal detection.

VBAT (Pin 12, 13, 14)

VBAT is the connection to the battery. Typically a 10

µF

Tantalum capacitor is needed for stability when there is no
battery attached. When a battery is attached, only a 0.1

µF

ceramic capacitor is required as the minimum decoupling
capacitor.

Typical Application

V2P8

GND

VBAT

IREF

STAT2

VIN

5V WALL

ADAPTER

BATTERY
PACK

IMIN

TEMP

STAT1

TIME

ISL6292D

V2P8

TOEN

10µF

330

1µF

IREF

80k

TIME

15nF

IMIN

80k

1µF

ISL6292D

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