LTC4090/LTC4090-5
USB Power Manager with
2A High Voltage Bat-Track
Buck Regulator
FEATURES DESCRIPTION
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Seamless Transition Between Power Sources: The LTC 4090/LTC4090-5 are USB power managers plus
Li-Ion Battery, USB, and 6V to 36V Supply (60V Max) high voltage Li-Ion/Polymer battery chargers. The devices
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2A Output High Voltage Buck Regulator with control the total current used by the USB peripheral for
Bat-Track Adaptive Output Control (LTC4090) operation and battery charging. Battery charge current
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Internal 215mW Ideal Diode Plus Optional is automatically reduced such that the sum of the load
External Ideal Diode Controller Provides Low Loss current and the charge current does not exceed the pro-
PowerPath When External Supply/ USB Not Present grammed input current limit. The LTC4090/LTC4090-5
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Load Dependent Charging from USB Input also accommodate high voltage power supplies, such as
Guarantees Current Compliance 12V AC/DC wall adapters, Firewire, or automotive power.
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Full Featured Li-Ion Battery Charger
The LTC4090 provides a Bat-Track adaptive output that
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1.5A Maximum Charge Current with Thermal Limiting
tracks the battery voltage for high efficiency charging from
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NTC Thermistor Input for Temperature Qualified
the high voltage input. The LTC4090-5 provides a fixed 5V
Charging
output from the high voltage input to charge single-cell
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Tiny (3mm 6mm 0.75mm) 22-Pin DFN Package
Li-Ion batteries. 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
APPLICATIONS
thermistor input used to monitor battery temperature while
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HDD-Based Media Players
charging and automatic recharging of the battery.
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Personal Navigation Devices
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
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Other USB-Based Handheld Products and Bat-Track, PowerPath and ThinSOT are trademarks of Analog Devices, Inc. All other
trademarks are the property of their respective owners.
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Automotive Accessories
TYPICAL APPLICATION
LTC4090/LTC4090-5 High Voltage
0.47F
6.8H
Battery Charger Efficiency
SW
BOOST
HIGH (7.5V-36V)
HVIN
22F
VOLTAGE INPUT 90
1F FIGURE 12 SCHEMATIC
LTC4090
WITH R = 52k
HVOUT PROG
5V WALL
80
NO OUTPUT LOAD
ADAPTER
IN HVPR
4.7F
70
USB
LTC4090 1k
LTC4090-5
V OUT LOAD
C
60
4.7F
TIMER BAT
50
R CLPROG GND PROG
T
40
59k
HVIN = 8V
+
40.2k 2k 100k
270pF 0.1F Li-Ion BATTERY HVIN = 12V
30
HVIN = 24V
HVIN = 36V
20
V (TYP) AVAILABLE INPUT
OUT
2.0 2.5 3.0 3.5 4.0 4.5
V + 0.3V HV INPUT (LTC4090)
BAT
V (V)
BAT
5V HV INPUT (LTC4090-5)
4090 TA01b
5V USB ONLY
V BAT ONLY
BAT
4090 TAO1
4090fe
1
For more information www.linear.com/LTC4090
EFFICIENCY (%)LTC4090/LTC4090-5
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Notes 1, 2, 3, 4)
TOP VIEW
HVIN, HVEN (Note 9) ................................................60V
SYNC 1 22 HVEN
BOOST ......................................................................56V
PG 2 21 HVIN
BOOST above SW .....................................................30V
R 3 20 SW
T
PG, SYNC ..................................................................30V
V 4 19 BOOST
C
IN, OUT, HVOUT
NTC 5 18 HVOUT
t < 1ms and Duty Cycle < 1% ................... 0.3V to 7V
23
VNTC 6 17 TIMER
Steady State ............................................ 0.3V to 6V
HVPR 7 16 SUSP
BAT, HPWR, SUSP, V , CHRG, HVPR ........... 0.3V to 6V
C
CHRG 8 15 HPWR
NTC, TIMER, PROG, CLPROG ..........0.3V to V + 0.3V
CC
PROG 9 14 CLPROG
I , I , I (Note 5) ..............................................2.5A
IN OUT BAT
GATE 10 13 OUT
Operating Temperature Range .....................40 to 85C
BAT 11 12 IN
Junction Temperature ............................................110C
DJC PACKAGE
Storage Temperature Range ......................65 to 125C
22-LEAD (6mm 3mm) PLASTIC DFN
T = 110C, = 47C/W
JMAX JA
EXPOSED PAD (PIN 23) IS GND, MUST BE SOLDERED TO PCB