1A, 97% Efficiency, 30µA Quiescent Current

Step-Up Converter with True Shutdown

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7

Pin Description

PIN

NAME

FUNCTION

1, 2

LX

Inductor Connection. LX pins are internally connected. Connect the LX pins to the switched side of

the inductor. LX is high impedance in shutdown.

3

BATT

Supply Voltage Input. Connect BATT to an input supply between 1.2V and 5V. Bypass BATT to EP

with two 4.7µF ceramic capacitors or one 10µF ceramic capacitor.

4ON

Logic On/Off Input. Drive ON low to place the MAX8815A into shutdown. During shutdown, the

control circuitry, internal switching MOSFET, and synchronous rectifier turn off and LX becomes high

impedance. Drive ON high for normal operation.

5

GND

Analog Ground

6FB

divider from POUT to GND (see the Setting the Output Voltage section). FB regulates to 1.265V (typ)

and is high impedance in shutdown.

7

OUTS

Power Bootstrapped Input. Connect OUTS to POUT through an RC filter.

8

SKIPB

PWM Mode Selection Input. Drive SKIPB low to select the normal mode of operation. Normal mode is

fixed PWM at medium to heavy loads and skip mode at light loads. Drive SKIPB high to select the

forced-PWM mode of operation.

9, 10

POUT

Converter Output. Bypass POUT to EP with one 22µF tantalum capacitor.

—EP

Exposed Paddle. Connect to the ground plane to optimize thermal performance. EP is internally

connected to GND. EP must be connected to GND at a single point with a star ground connection.