■Overview

The AN8049SH is a three-channel PWM DC-DC converter control IC that features low-voltage operation.

This IC can form a power supply that provides two step up outputs and one step-down or polarity inverted output with a minimal number of external components. The AN8049SH features the ability to operate from a supply voltage as low as 1.8 V, and thus can be operated from two dry-batteries.

■Features

?Wide operating supply voltage range: 1.8 V to 14 V

?High-precision reference voltage circuit

—VREFpin voltage: ±1

— Error amplifier: ±1.5

?Surface mounting package for miniaturized and thinner power supplies Package: SSOP-24D

0.5-mm lead pitch

7.8 mm ×6.8 mm ×t1.9 mm

?Supports control over a wide output frequency range: 20 kHz to 1 MHz

?On/off (sequence control) pins provided for each channel for easy sequence control setup

?The negative supply error amplifier supports 0-volt input.

Common-mode input voltage range: ?0.1 V to VCC ?1.4 V

This allows the number of external components to be reduced by two resistors.

?Fixed duty factor: 86 However, the duty can be adjusted to anywhere from 0 to 100 with an external resistor.

?Timer latch short-circuit protection circuit (charge current: 1.1 μA typical)

?Low input voltage malfunction prevention circuit (U.V.L.O.) (operation start voltage: 1.67 V typical)

?Standby function (active-high control input, standby mode current: 1 μA maximum)

?Alternate package versions also available.

Part No.: AN8049FHN

Package: QFN-24

0.5-mm lead pitch

5.4 mm ×4.4 mm ×t0.8 mm

■Applications

?Electronic equipment that requires a power supply system