LTC4162EUFD-FSTM#PBF datasheet(10/52 Pages) AD

10 / 52 page

LTC4162-F

Rev A

For more information www.analog.com

PIN FUNCTIONS

BOOST (Pin 1): Gate-Drive bias for the high side switch in

the switching regulator. This pin provides a pumped bias

voltage relative to SW. The voltage on this pin is charged

up through an internal diode from INTVCC. A 22nF multi-

layer ceramic capacitor is required from SW to BOOST.

INTVCC (Pin 2): Bypass pin for the internal 5V regulator.

This regulator provides power to the internal analog cir-

cuitry. A 4.7µF multilayer ceramic capacitor is required

from INTVCC to GND.

VOUTA (Pin 3): Analog system power pin. VOUTA powers

the majority of circuits on the LTC4162. A 0.1µF multilayer

ceramic capacitor is required from VOUTA to GND.

CLN (Pin 4): Connection point for the negative terminal

of the sense resistor that measures and regulates input

current by limiting charge current.

CLP (Pin 5): Connection point for the positive terminal

of the sense resistor that measures and regulates input

current by limiting charge current.

INFET (Pin 6): Gate control output pin for an input reverse

blocking external N-channel MOSFET between VIN and

VOUT.

VIN (Pin 7): Supply voltage detection and INFET charge

pump supply for the INFET/BATFET PowerPath. When

voltage at VIN is detected as being high enough to charge a

battery,theINFETcharge-pumpisactivatedandtheBATFET

charge-pump is deactivated thereby powering VOUTA from

the input supply through an external NMOS transistor and

also starting a charge cycle. A 0.1µF multilayer ceramic

capacitor is required from VIN to GND.

VCC2P5 (Pin 8): Bypass pin for the internal 2.5V regula-

tor. This regulator provides power to the internal logic

circuitry. A 1µF multilayer ceramic capacitor is required

from VCC2P5 to GND.

NTCBIAS (Pin 9): NTC thermistor bias output. Connect a

lowtemperaturecoefficientbiasresistorbetweenNTCBIAS

and NTC, and a thermistor between NTC and GND. The

bias resistor should be equal in value to the nominal value

of the thermistor. The LTC4162 applies 1.2V to this pin

during NTC measurement and expects a thermistor β

value of 3490K. Higher β value thermistors can be used

with simple circuit modifications.

TYPICAL PERFORMANCE CHARACTERISTICS

Histogram of iin Readings

Histogram of vin Readings

1.035

1.040

1.045

1.050

1.055

1.060

INPUT CURRENT (A)

1000

2000

3000

4000

σ = 1.62mA

4162F G24

12.00

12.01

12.02

12.03

12.04

INPUT VOLTAGE (V)

2500

5000

7500

10000

σ = 3.57mV

4162F G25

TA = 25°C, unless otherwise noted.

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