LTC4089-1 Datasheet, PDF (1/24 Pages) Linear Technology – USB Power Manager with High Voltage Switching Charger

LTC4089-1
USB Power Manager with
High Voltage Switching Charger
FEATURES
■ _{Seamless Transition Between Power Sources: Li-Ion}
Battery, USB, and 6V to 36V External Supply
■ _{High Efficiency 1.2A Charger from 6V to 36V Input}
■ _{Load Dependent Charging from USB Input}
Guarantees Current Compliance
■ _{215m Internal Ideal Diode plus Optional External}
Ideal Diode Controller Provides Low Loss Power
Path When External Supply/USB Not Present
■ _{Constant-Current/Constant-Voltage Operation with}
Thermal Feedback to Maximize Charging Rate
without Risk of Overheating
■ _{Selectable 100% or 20% Current Limit (e.g., 500mA/}
100mA) from USB Input
■ _{Preset 4.1V Charge Voltage with 0.8% Accuracy}
■ _{C/10 Charge Current Detection Output}
■ _{NTC Thermistor Input for Temperature Qualified}
Charging
■ _{Tiny (6mm 3mm 0.75mm) 22-Pin DFN Package}
U
APPLICATIO S
■ _{Portable USB Devices—GPS Receivers, Cameras,}
MP3 Players, PDAs
DESCRIPTIO
The LTC^®4089-1 is a USB power manager plus high voltage
Li-Ion battery charger. This device controls the total cur-
rent 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 cur-
rent does not exceed the programmed input current limit.
The LTC4089-1 also accommodates high voltage power
supplies, such as 12V AC-DC wall adapters, FireWire, or
automotive power.
The LTC4089-1 provides a fixed 5V output from the high
voltage input to charge single cell Li-Ion batteries. The
charge current is programmable and an end-of-charge
status output (CHRG) indicates full charge. Also featured
is 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.
All other trademarks are the property of their respective owners.
Burst Mode is a registered trademark of Linear Technology Corporation.
Protected by U.S. Patents including 6522118 and 6700364.
TYPICAL APPLICATIO
HIGH (6V-36V)
VOLTAGE INPUT
5V (NOM)
FROM USB
CABLE V_BUS
1F
4.7 F
HVIN
HVEN
BOOST
IN
LTC4089-1
0.1 F
SW
HVOUT
HVPR
OUT
10 H
1k
0.1 F
BAT
TIMER
CLPROG GND PROG
2k
100k
+
Li-Ion BATTERY
10 F
TO LDOs
4.7 F ^REGS^{, ETC.}
V_OUT (TYP)
5V
5V
V_BAT
AVAILABLE INPUT
HV INPUT (LTC4089-1)
USB ONLY
BAT ONLY
4089-1 TAO1
LTC4089-1 High Voltage
Battery Charger Efficiency
90
CC CURRENT = 970mA
85 NO OUTPUT LOAD
FIGURE 10 SCHEMATIC
80 _{WITH RPROG = 52k}
75
LTC4089-1
70
65
60
55
50
45
40
2.5
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
3
3.5
4
4.5
BATTERY VOLTAGE (V)
4089-1 TA01b
40891f
1