POWER MANAGEMENT

4A, 2.2MHz Synchronous Step-Down Regulator

with 15 Preset Output Voltages

SC187

Features

Input Voltage Range — 2.9 to 5.5V

Output Voltage Range — 0.8V to 3.3V

Output Current — up to 4A

Ultra-Small Footprint — <1mm Height Solution

Minimum 1.8MHz Switching Frequency with no AM

Radio Band Interference

Efficiency Up to 95%

Low Output Noise Across Load Range

Excellent Transient Response

Start Up into Pre-Bias Output

Duty-Cycle Low Dropout Operation — 100%

Shutdown Current — <1µA

Externally Programmable Soft Start Time

Power Good indicator

Input Under-Voltage Lockout

Output Over-Voltage, Current Limit Protection

Over-Temperature Protection

Thermally Enhanced 3 x 3 x 0.6 (mm)

MLPQ-UT16 package

Temperature Range — -40 to +85°C

Lead-free, Halogen free, and RoHS/WEEE compliant

Applications

Automotive Power Supplies

Routers and Network Cards

LCD TV

Office Automation

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Description

The SC187 is a 4A synchronous step-down regulator

designed to operate with an input voltage range of 2.9V

to 5.5V. The device offers fifteen pre-determined output

voltages via four control pins programmable from 0.8 to

3.3 Volts. The control pins allow for on-the-fly voltage

changes, enabling system designers to implement

dynamic power savings. The device is also capable of

adjusting output voltage via an external resistor divider.

The SC187 operates in PWM mode with fixed 2.2MHz

oscillator frequency, allowing the use of small surface

mount external components.

Connecting the control pins to logic low forces the device

into shutdown mode reducing the supply current to less

than 1μA. Connecting any of the control pins to logic high

enables the converter and sets the output voltage accord-

ing to Table 1. Other features include under-voltage

lockout, programmable soft-start to limit in-rush current,

power good indicator, over-temperature protection, and

output short circuit protection.

The SC187 is available in a thermally-enhanced, 3 x 3 x 0.6

(mm) MLPQ-UT16 package.

Typical Application Circuit

CTL0

CTL1

PGND

AVIN

22µF

47µF

LX

VOUT

SC187

1Ω

PVIN

CTL2

AGND

CTL3

CTL0

CTL1

CTL2

CTL3

L

1.0µH

100kΩ

PGOOD

10nF

SS

10nF

Rev 2.0

1