DA9128A.002

July 12, 1998

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The MAS9128A is voltage regulator IC with three

2.85V LDO regulators providing voltage regulation

for the handset terminal. The output voltages of the

three regulators can be modified through a mask

option. Two enable/disable pins control the state of

the regulators. In order to save power the device

goes into sleep mode when all regulators are

disabled. An internal thermal protection circuit

prevents the device from overheating. The

maximum output current is limited internally.

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• 2.85V regulators at 100mA, 70mA and 50mA

• Output accuracy <±3%

• Fast dynamic response

• Low output noise

• Low supply current: 150µA per regulator

• SO8 package

• Mobile phones

• Cordless phones

• Battery powered systems

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Bandgap

Reference

LDO_B

(70mA)

OUTB

VREF

ENA

GND

VCC

ENBC

LDO_A

(100mA)

OUTA

LDO_C

(50mA)

OUTC

&

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Temperature

Protection

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