LTC4090| Datasheet

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FEATURES

LTC4090/LTC4090-5 USB Power Manager with 2A High Voltage Bat-Track Buck Regulator DESCRIPTION
The LTC 4090/LTC4090-5 are USB power managers plus high voltage Li-Ion/Polymer battery chargers. The devices control the total current used by the USB peripheral for operation and battery charging. Battery charge current is automatically reduced such that the sum of the load current and the charge current does not exceed the programmed input current limit. The LTC4090/LTC4090-5 also accommodate high voltage power supplies, such as 12V AC/DC wall adapters, FireWire, or automotive power. The LTC4090 provides a Bat-Track adaptive output that tracks the battery voltage for high efficiency charging from the high voltage input. The LTC4090-5 provides a fixed 5V output from the high voltage input to charge single cell Li-Ion bateries. The charge current is programmable and an end-of-charge status output (CHRG) indicates full charge. Also featured are programmable total charge time, an NTC thermistor input used to monitor battery temperature while charging and automatic recharging of the battery.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Bat-Track is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Seamless Transition Between Power Sources: LiIon Battery, USB, and 6V to 36V Supply (60V Max) 2A Output High Voltage Buck Regulator with BatTrackTM Adaptive Output Control (LTC4090) Internal 215m Ideal Diode Plus Optional External Ideal Diode Controller Provides Low Loss Power Path When External Supply / USB Not Present Load Dependent Charging from USB Input Guarantees Current Compliance Full Featured Li-Ion Battery Charger 1.5A Maximum Charge Current with Thermal Limiting NTC Thermistor Input for Temperature Qualified Charging Tiny (3mm 6mm 0.75mm) 22-Pin DFN Package

APPLICATIONS

HDD-Based Media Players Personal Navigation Devices Other USB-Based Handheld Products Automotive Accessories

TYPICAL APPLICATION
0.47F HIGH (6V-36V) VOLTAGE INPUT 5V WALL ADAPTER IN USB 4.7F VC TIMER RT 0.1F 40.2k CLPROG 2k GND LTC4090 OUT 4.7F BAT PROG 100k HVIN 1F HVOUT HVPR 1k BOOST SW 22F 6.8H

LTC4090/LTC4090-5 High Voltage Battery Charger Efficiency
90 FIGURE 12 SCHEMATIC WITH RPROG = 52k 80 NO OUTPUT LOAD LTC4090

EFFICIENCY (%)

LOAD

70 LTC4090-5 60 50 40 30 HVIN = 8V HVIN = 12V HVIN = 24V HVIN = 36V 2.5 3.5 3.0 VBAT (V) 4.0 4.5
4090 TA01b

59k 270pF

+

Li-Ion BATTERY

VOUT (TYP) VBAT + 0.3V 5V 5V VBAT

AVAILABLE INPUT HV INPUT (LTC4090) HV INPUT (LTC4090-5) USB ONLY BAT ONLY

20 2.0
4090 TAO1

4090fa

1

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LTC4090 DATASHEET