LTC4095
Standalone USB
Li-Ion/Polymer Battery
Charger in 2mm 2mm DFN
FEATURES DESCRIPTION
Full-Featured Standalone USB Li-Ion/Polymer The LTC 4095 is a complete constant-current/constant-
Battery Charger voltage linear charger for single-cell lithium-ion/polymer
100mA to 950mA Programmable Charge Current batteries. Its small 2mm 2mm DFN package and low
C/10 Charge Current Detection Output external component count make the LTC4095 especially
Internal Safety Timer Termination well-suited for portable USB power applications.
NTC Thermistor Input for Temperature Quali ed
Up to 950mA of charge current may be programmed via a
Charging
single resistor from the PROG pin to ground. The HPWR
Preset 4.2V Float Voltage with 0.5% Accuracy
pin allows the charge current to be set at 20% or 100% of
Constant-Current/Constant-Voltage Operation with
its full-scale programmed value. An internal safety timer
Thermal Feedback
terminates charge current. The nal oat voltage is preset
Charge Current Monitor Output for Gas Gauging
to 4.2V and held to a tight 0.5% tolerance. Also featured
Automatic Recharge
is an NTC thermistor input to monitor battery temperature
Bad-Battery Detection
while charging, a C/10 current detection output, automatic
8.5A Input Supply Current in Suspend Mode
recharge, bad-battery detection and low-battery trickle
Tiny 8-Lead (2mm 2mm) DFN Package
charge. A thermal feedback loop regulates the charge
current to limit the die temperature during high power
APPLICATIONS
operation or high ambient thermal conditions.
PDAs
The LTC4095 is available in a tiny, low pro le (0.75mm)
Media Players
8-lead 2mm 2mm DFN package.
Cellular Phones
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Other Portable Electronics
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118, 6570372, 6700364.
TYPICAL APPLICATION
500mA Single-Cell Li-Ion Charger
IN
4.3V TO 5.5V
IN BAT
UP TO 7V
TRANSIENTS LTC4095
+
Li-Ion
C HPWR CHRG
IN
BATTERY
1F
SUSP NTC
PROG
R
PROG
GND
1.74k
4095 TA01a
4095fa
1LTC4095
ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION
(Notes 1, 2, 3)
Input Supply Voltage (IN) TOP VIEW
t < 1ms and Duty Cycle < 1% .................. 0.3V to 7V
BAT 1 8 IN
Steady State ............................................. 0.3V to 6V
GND 2 7 PROG
9
BAT, SUSP, CHRG Voltage ............................ 0.3V to 6V CHRG 3 6 NTC
SUSP 4 5 HPWR
PROG, NTC, HPWR
Voltage ............................ 0.3V to Max (IN, BAT) + 0.3V
DC PACKAGE
8-LEAD (2mm 2mm) PLASTIC DFN
I .............................................................................1A
BAT
T = 125C, = 60C/W
JMAX JA
I ...................................................................1.25mA
PROG EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
I ......................................................................50mA
CHRG
ORDER PART NUMBER DC PART MARKING
Junction Temperature ........................................... 125C
Operating Temperature Range ................. 40C to 85C
LTC4095EDC LCLG
Storage Temperature Range ................... 65C to 125C
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: