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LTC4090EDJC-5-PBF Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4090EDJC-5-PBF
Description  USB Power Manager with 2A High Voltage Bat-Track Buck Regulator
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4090EDJC-5-PBF Datasheet(HTML) 1 Page - Linear Technology

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LTC4090/LTC4090-5
1
4090fa
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
USB Power Manager with
2A High Voltage Bat-Track
Buck Regulator
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 accom-
modate 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 (
⎯C⎯H⎯R⎯G) 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.
Seamless Transition Between Power Sources: Li-
Ion Battery, USB, and 6V to 36V Supply (60V Max)
2A Output High Voltage Buck Regulator with Bat-
TrackTM Adaptive Output Control (LTC4090)
Internal 215m
Ω 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 Guaran-
tees 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
HDD-Based Media Players
Personal Navigation Devices
Other USB-Based Handheld Products
Automotive Accessories
, 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.
HVIN
BOOST
IN
SW
4.7
μF
22
μF
4.7
μF
1
μF
TIMER
CLPROG
LTC4090
GND
PROG
HVOUT
HVPR
OUT
BAT
0.1
μF
270pF
100k
2k
5V WALL
ADAPTER
USB
HIGH (6V-36V)
VOLTAGE INPUT
VC
59k
RT
40.2k
Li-Ion BATTERY
+
1k
LOAD
4090 TAO1
VOUT (TYP)
VBAT + 0.3V
5V
5V
VBAT
AVAILABLE INPUT
HV INPUT (LTC4090)
HV INPUT (LTC4090-5)
USB ONLY
BAT ONLY
6.8
μH
0.47
μF
LTC4090/LTC4090-5 High Voltage
Battery Charger Efficiency
VBAT (V)
2.0
70
80
90
4.0
4090 TA01b
60
50
20
40
30
2.5
3.0
3.5
4.5
FIGURE 12 SCHEMATIC
WITH RPROG = 52k
NO OUTPUT LOAD
HVIN = 8V
HVIN = 12V
HVIN = 24V
HVIN = 36V
LTC4090
LTC4090-5


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