LTC4089/LTC4089-5
1
40895fc
APPLICATIONS
HVIN
BOOST
HVEN
IN
SW
4.7μF
10μF
4.7μF
1μF
TIMER
CLPROG
LTC4089
GND PROG
HVOUT
HVPR
OUT
BAT
0.1μF
100k2k
5V (NOM)
FROM USB
CABLE V
BUS
HIGH (6V-36V)
VOLTAGE INPUT
Li-Ion BATTERY
+
1k
TO LDOs
R
EGS
, ETC.
4089 TAO1
VOUT (TYP)
V
BAT
+0.3V
5V
5V
V
BAT
AVAILABLE INPUT
HV INPUT (LTC4089)
HV INPUT (LTC4089-5)
USB ONLY
BAT ONLY
10μH
0.1μF
USB Power Manager with
High Voltage Switching Charger
The LTC
®
4089/LTC4089-5 are USB power managers plus
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.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6522118, 6700364.
n
Portable USB Devices—GPS Receivers, Cameras,
MP3 Players, PDAs
n
Seamless Transition Between Power Sources: Li-Ion
Battery, USB, and 6V to 36V External Supply
n
High Effi ciency 1.2A Charger from 6V to 36V Input
with Adaptive Output Control (LTC4089)
n
Load Dependent Charging from USB Input
Guarantees Current Compliance
n
215m Internal Ideal Diode plus Optional External
Ideal Diode Controller Provides Low Loss Power
Path When External Supply/USB Not Present
n
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
without Risk of Overheating
n
Selectable 100% or 20% Current Limit (e.g., 500mA/
100mA) from USB Input
n
Preset 4.2V Charge Voltage with 0.8% Accuracy
n
C/10 Charge Current Detection Output
n
NTC Thermistor Input for Temperature Qualifi ed
Charging
n
Tiny (6mm × 3mm × 0.75mm) 22-Pin DFN Package
LTC4089 High Voltage
Battery Charger Effi ciency
BATTERY VOLTAGE (V)
2.5
40
EFFICIENCY (%)
45
55
60
65
90
75
3
3.5
4089 TA01b
50
80
85
70
4
4.5
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
CC CURRENT = 970mA
NO OUTPUT LOAD
FIGURE 10 SCHEMATIC
WITH R
PROG
= 52k
LTC4089-5
LTC4089
TYPICAL APPLICATION
DESCRIPTION FEATURES