ETA9740

www.etasolution.com

3

Powering Minds of the Smart

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Low side Nmos Rdson

ISW =500mA

70

mΩ

Short Circuit Hiccup Current

3.8

A

Short Circuit Hiccup Timer

On Time

45

ms

Off Time

2000

Charging Thermal Regulation threshold

85

oC

Thermal Shutdown

Rising, Hys=20oC

150

oC

PIN DESCRIPTION

PIN #

NAME

DESCRIPTION

1

SW

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

2

LED1

Fuel gauge LED1, LED2 connection pin

3

LED2

Fuel gauge LED3, LED4 connection pin

4

LED3

Fuel gauge LED1, LED2, LED3, LED4 connection pin

5

ISET

Buck Charging current setting pin. Connect a resistor between this pin and analog

ground to set the current level.

6

BAT

Battery pin. Connect a Battery to this pin, and with a bypass capacitor 10uF.

7

OUT

Output pin. Bypass with a 22uF or larger ceramic capacitor closely between this pin

and GND

8

PGND

Power Ground Pin

9 / Exposed Pad

AGND

Analog Ground Pin

TYPICAL CHARACTERISTICS

(Vin=5V, TA=250C, unless otherwise specified)

In CHARGE MODE, Efficiency Vs Vbat at 2.1A and 3A charge current

3

3.2

3.4

3.6

3.8

4

4.2

90%

91%

92%

93%

94%

95%

96%

97%

98%

99%

100%

Vbat (V)

VIN=5V,ICHARG=2.1A

3

3.2

3.4

3.6

3.8

4

4.2

88%

90%

92%

94%

96%

98%

100%

Vbat (V)

VIN=5V,ICHARG=3A