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LTC4088EDE-2-TRPBF Datasheet(PDF) 7 Page - Linear Technology

Part # LTC4088EDE-2-TRPBF
Description  High Effi ciency Battery Charger/USB Power Manager with Regulated Output Voltage
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4088EDE-2-TRPBF Datasheet(HTML) 7 Page - Linear Technology

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LTC4088-1/LTC4088-2
7
40881fb
CHRG Pin Current vs Voltage
(Pull-Down State)
PI FU CTIO S
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted.
CHRG PIN VOLTAGE (V)
0
60
80
100
4
408812 G19
40
20
0
1
2
3
5
VBUS = 5V
VBAT = 3.8V
IOUT
500 A/DIV
0mA
500µs/DIV
408812 G21
VOUT
20mV/DIV
AC COUPLED
Suspend LDO Transient Response
(500µA to 1mA)
NTC (Pin 1): Input to the NTC Thermistor Monitoring
Circuits. The NTC pin connects to a negative temperature
coefficient thermistor which is typically co-packaged with
the battery pack to determine if the battery is too hot or
too cold to charge. If the battery’s temperature is out of
range, charging is paused until the battery temperature re-
enters the valid range. A low drift bias resistor is required
from VBUS to NTC and a thermistor is required from NTC
to ground. If the NTC function is not desired, the NTC pin
should be grounded.
CLPROG (Pin 2): USB Current Limit Program and Monitor
Pin. A 1% resistor from CLPROG to ground determines
the upper limit of the current drawn from the VBUS pin.
A precise fraction of the input current, hCLPROG, is sent
to the CLPROG pin when the high side switch is on. The
switching regulator delivers power until the CLPROG
pin reaches 1.188V. Therefore, the current drawn from
VBUS will be limited to an amount given by hCLPROG and
RCLPROG. There are several ratios for hCLPROG available,
two of which correspond to the 500mA and 100mA USB
specifications. A multilayer ceramic averaging capacitor
is also required at CLPROG for filtering.
VOUTS (Pin 3): Output Voltage Sense. The VOUTS pin is
used to sense the voltage at VOUT when the PowerPath
switching regulator is in operation. VOUTS should always
be connected directly to VOUT.
D2 (Pin 4): Mode Select Input Pin. D2, in combination
with the D0 pin and D1 pin, controls the current limit and
battery charger functions of the LTC4088-1/LTC4088-2. The
LTC4088-1 and LTC4088-2 differ only in the functionality
of the D2 pin default (0, 0, 0) state (see Table 1). This pin
is pulled low by a weak current sink.
C/X (Pin 5): End of Charge Indication Program Pin. This pin
is used to program the current level at which a completed
charge cycle is indicated by the CHRG pin.
PROG (Pin 6): Charge Current Program and Charge Cur-
rent Monitor Pin. Connecting a 1% resistor from PROG
to ground programs the charge current. If sufficient input
power is available in constant-current mode, this pin servos
to 1V. The voltage on this pin always represents the actual
charge current by using the following formula:
I
V
R
BAT
PROG
PROG
=
• 1031


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