ISL6257 Highly Integrated Narrow VDC Battery Charger for Notebook Computers

ISL6257

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Highly Integrated Narrow VDC Battery Charger for Notebook Computers

Datasheets,
Related Docs
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Ordering Information

iBuy direct from Intersil	iBuy direct - out of stock	Request samples
Check distributor inventory	Available in RoHS/Pb-Free

Part No.

Design-In
Status

Temp.

Package

MSL

Price
US $

ISL6257HRZ

Active

Hi-Temp Comm

28 Ld QFN

3.42

ISL6257HRZ-T

Active

Hi-Temp Comm

28 Ld QFN T+R

3.42

The price listed is the manufacturer's suggested retail price for quantities of 1K units. However, prices in today's market are fluid and may change without notice.

MSL = Moisture Sensitivity Level - per IPC/JEDEC J-STD-020

SMD = Standard Microcircuit Drawing

Description

The ISL6257 is a highly integrated battery charger controller for Li-Ion/Li-Ion polymer batteries. ISL6257 is designed for Narrow VDC applications where the system power source is either the battery pack or the regulated output of the charger. This makes the max voltage to the system equal to the max battery voltage instead of the max adapter voltage. Operating at lower system voltage can improve overall efficiency. High efficiency is achieved in the charger with a synchronous buck topology. The low-side MOSFET emulates a diode at light loads to improve the light load efficiency and prevent system bus boosting.

The constant output voltage can be selected for 2, 3 and 4 series Li-Ion cells with ±0.5% accuracy over temperature. It can also be programmed between 4.2V + 5% per cell and 4.2V - 5% per cell to optimize battery capacity. When supplying the load and battery charger simultaneously, the input current limit for the AC adapter is programmable to within ±3% accuracy to avoid overloading the AC adapter and to allow the system to make efficient use of available adapter power for charging. It also has a wide range of programmable charging current. The ISL6257 automatically transitions from regulating current mode to regulating voltage mode.

Key Features

±0.5% Charge Voltage Accuracy (-10°C to +100°C)
±3% Accurate Input Current Limit
±3% Accurate Battery Charge Current Limit
±25% Accurate Battery Trickle Charge Current Limit
Programmable Charge Current Limit, Adapter Current Limit and Charge Voltage
Fixed 300kHz PWM Synchronous Buck Controller with Diode Emulation at Light Load
AC Adapter Present Indicator
Fast Input Current Limit Response
Input Voltage Range 7V to 25V
Support 2, 3 and 4 Cells Battery Pack
Up to 17.64V Battery-Voltage Set Point
Control Adapter Power Source Select MOSFET
Thermal Shutdown
Aircraft Power Capable
DC Adapter Present Indicator
Battery Discharge MOSFET Control
Less than 10ìA Battery Leakage Current
Support Pulse Charging
Charge any Battery Chemistry: Li-Ion, NiCd, NiMH, etc.
Pb-Free Plus Anneal Available (RoHS Compliant)

Related Documentation

Datasheet(s):
Highly Integrated Narrow VDC Battery Charger for Notebook Computers

Parametric Data


Input Voltage Range (V)		7 to 25

Input Current Limit Accuracy (%)		±1.5

Battery Charge Voltage (V)		4.2/Cell (2S, 3S, 4S)

Charging Voltage Accuracy (max) (%)		±0.5

Battery Charge Voltage Adjust (%)		±5/Cell

Charge Current Limit Accuracy (%)		±1.5 (CHLIM=2.0V)

Trickle Charge Current Limit Accuracy (%)		±25 (CHLIM=0.2V)

Automatic Trickle Charge (typ) (V)		No (Set by Host)

Battery Leakage Current (max) (µA)		10 (DCIN=0V, No System Load)

Automatic Power Source Selection		No (Set by Host)

DC Adapter Detection		Yes

Topology		Fixed Frequency Synchronous Buck

Switching Frequency (typ) (kHz)		300

Max Duty Cycle (%)		99.9

Audible Noise		No

Operating Temp. Range (°C)		-10 to 100

Thermal Shutdown (°C)		150

Applications

Notebook, Desknote and Sub-notebook Computers
Personal Digital Assistant

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Parametric Table

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