ETA9185

www.etasolution.com

4

Empower Thinkers

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

OFF

168

ms

ENBST Input Current

VENBST=5V or 0V

-5

0

5

μA

ENBST High Voltage

VOUT=5V

1.2

V

ENBST low Voltage

VOUT=5V

0.4

V

Thermal Shutdown

Rising, Hysteresis=20°C

140

°C

PIN DESCRIPTION

PIN #

NAME DESCRIPTION

1

VIN

Input Supply Voltage. Bypass with a 10μF ceramic capacitor to GND

2

BAT

Connected to the battery positive terminal. Bypass with a 10uF ceramic capacitor to GND

3

ISET

Charge current program pin. The charge current is programmed by connecting a 1% resistor

(RISET), between ISET, to GND pin. The charge current can be calculated by using the

following formula:

IBAT=

1

Rset

×1000

4

ENBST

Enable pin for the Boost converter. Leave this pin floating to enable the part, low to disable.

Pulling high is not recommended.

5

SW

Inductor Connection. Connect an inductor Between SW and the regulator output.

6

OUT

Output pin. Bypass with a 22μF or larger ceramic capacitor closely between this pin and GND

7

NTC

Battery Temperature Monitoring input pin. It sets the valid temperature operating range for

battery charging. Disable NTC by setting R1=10K, RNTC=10K

8

LED1 LED1 pin for driver LED

9

LED2 LED2 pin for driver LED

10

LED3 LED2 pin for driver LED

11

GND

GND