ltc4089 Linear Technology Corporation, ltc4089 Datasheet
ltc4089
Manufacturer Part Number
ltc4089
Description
Usb Power Manager With High Voltage Switching Charger
Manufacturer
Linear Technology Corporation
Datasheet
1.LTC4089.pdf
(24 pages)
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APPLICATIO S
FEATURES
■
■
■
■
■
■
■
■
■
■
■
TYPICAL APPLICATIO
VOLTAGE INPUT
HIGH (6V-36V)
CABLE V
Seamless Transition Between Power Sources: Li-Ion
Battery, USB, and 6V to 36V External Supply
High Effi ciency 1.2A Charger from 6V to 36V Input
with Adaptive Output Control (LTC4089)
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 4.2V Charge Voltage with 0.8% Accuracy
C/10 Charge Current Detection Output
NTC Thermistor Input for Temperature Qualifi ed
Charging
Tiny (6mm 3mm 0.75mm) 22-Pin DFN Package
Portable USB Devices—GPS Receivers, Cameras,
MP3 Players, PDAs
FROM USB
5V (NOM)
BUS
0.1µF
1µF
4.7µF
U
TIMER
HVIN
HVEN
IN
CLPROG
2k
LTC4089
BOOST
GND PROG
U
100k
HVOUT
HVPR
0.1µF
OUT
BAT
SW
Li-Ion BATTERY
10µH
High Voltage Switching Charger
1k
+
VOUT (TYP)
V
BAT
10µF
4.7µF
DESCRIPTIO
V
The LTC
high voltage Li-Ion battery chargers. These devices control
the total current used by the USB peripheral for operation
and battery charging. Battery charge current is automati-
cally reduced such that the sum of the load current and
the charge current does not exceed the programmed input
current limit. The LTC4089/LTC4089-5 also accommodate
high voltage power supplies, such as 12V AC-DC wall
adapters, FireWire, or automotive power.
The LTC4089 provides an adaptive output that tracks the
battery voltage for high effi ciency charging from the high
voltage input. The LTC4089-5 provides a fi xed 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 (CHRG) 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.
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.
5V
5V
BAT
+0.3V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
USB Power Manager with
TO LDOs
R
EGS
HV INPUT (LTC4089-5)
HV INPUT (LTC4089)
AVAILABLE INPUT
®
, ETC.
4089/LTC4089-5 are USB power managers plus
USB ONLY
BAT ONLY
LTC4089/LTC4089-5
U
4089 TAO1
70
40
90
85
80
75
65
60
55
50
45
2.5
LTC4089 High Voltage
Battery Charger Effi ciency
CC CURRENT = 970mA
NO OUTPUT LOAD
FIGURE 10 SCHEMATIC
WITH R
PROG
3
BATTERY VOLTAGE (V)
= 52k
3.5
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
4
LTC4089-5
LTC4089
4089 TA01b
40895fb
4.5
1
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