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LTC4096 Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4096
Description  Dual Input Standalone Li-Ion Battery Chargers
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4096 Datasheet(HTML) 7 Page - Linear Technology

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LTC4096/LTC4096X
7
4096xf
TEMPERATURE (
°C)
–50
–25
050
25
75
100
DCIN UVLO
USBIN UVLO
4096 G29
4.10
3.95
3.90
3.85
3.80
3.75
4.05
4.00
3.70
PIN FUNCTIONS
DCIN (Pin 1): Wall Adapter Input Supply Pin. Provides
power to the battery charger. The maximum supply
current is 1.2A. This pin should be bypassed with a 1µF
capacitor.
USBIN (Pin 2): USB Input Supply Pin. Provides power to
the battery charger. The maximum supply current is 1A.
This pin should be bypassed with a 1µF capacitor.
PWR (Pin 3): Power Present Output. When the DCIN or
USBIN pin voltage is sufficient to begin charging (i.e. when
the DCIN or USBIN supply is greater than the undervoltage
lockout thresholds and at least 100mV or 150mV, re-
spectively, above the battery terminal), the PWR pin is
connected to the appropriate input through an internal
P-channel MOSFET. If sufficient voltage to charge is not
present on DCIN or USBIN the PWR pin is high impedance.
This output is able to source up to 120mA.
⎯C⎯H⎯R⎯G (Pin 4): Open-Drain Charge Status Output. When
the LTC4096 is charging, the
⎯C⎯H⎯R⎯G pin is pulled low by
an internal N-channel MOSFET. When the charge cycle is
completed,
⎯C⎯H⎯R⎯G becomes high impedance. This output
is capable of sinking up to 10mA, making it suitable for
driving an LED.
SUSP (Pin 5): Charge Enable Input. A logic low on this
pin enables the charger. If left floating, an internal 3.4M
Ω
pull-down resistor defaults the LTC4096 to charge mode.
Pull this pin high for shutdown.
ITERM (Pin 6): Charge Termination Current Threshold
Program. The termination current threshold, ITERMINATE, is
set by connecting a resistor, RITERM, to ground. ITERMINATE
is set by the following formula:
I
V
R
TERMINATE
ITERM
=
100
When the battery current, IBAT, falls below the termination
threshold, charging stops and the
⎯C⎯H⎯R⎯G output becomes
high impedance.
IUSB (Pin 7): Charge Current Program for USB Power.
The charge current is set by connecting a resistor, RIUSB,
to ground. When charging in constant-current mode, this
pin servos to 1V. The voltage on this pin can be used to
measure the battery current delivered from the USBIN
input using the following formula:
I
V
R
BAT
IUSB
IUSB
=
• 1000
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Supply Current vs
Temperature and VUSBIN
Undervoltage Lockout Voltage
(Falling) vs Temperature
TA = 25°C, unless otherwise noted.
4096 G28
60
50
30
40
20
10
0
SUSP = VUSBIN
VDCIN = 0V
VUSBIN = 4.25V
VUSBIN = 5.5V
TEMPERATURE (
°C)
–50
–25
0
50
25
75
100


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