Synchronous Step-Down DC/DC Converter with Built-In LDO Regulator in Parallel plus Voltage Detector

% MSOP-10

% USP-10

* Diodes shown in the above circuits are protective diodes.

Ta=25

(*1) IOUT = Pd / (VIN - VOUT) when PC board mounting.

(*2) Package power dissipation

V

VDOUT

CE Pin Voltage

MODE Pin Voltage

USP-10

MSOP-10

MODE

- 0.3 ~ VDD + 0.3

- 0.3 ~ VDD + 0.3

V

DCOUT

- 0.3 ~ VDD + 0.3

V

PVDD

V

CE

- 0.3 ~ VDD + 0.3

SYMBOL

RATINGS

UNITS

AVDD

- 0.3 ~ 6.5

V

- 0.3 ~ VDD + 0.3

V

- 55 ~ + 125

120 (*2)

Topr

Tstg

Storage Temperature Range

VDOUT Pin Voltage

LX Pin Voltage

Continuous Power Dissipation (*1)

Operating Temperature Range

VROUT Pin Voltage

AVDD Pin Voltage

PVDD Pin Voltage

DCOUT Pin Voltage

PARAMETER

350

Pd

XC9509 Series

mW

LX

VROUT

- 0.3 ~ VDD + 0.3

V

- 0.3 ~ VDD + 0.3

V

- 40 ~ + 85

0.15+0.01

0~5

O

-

3.00+0.10

-

(0.5

)

(0.2)

2.7+0.05

0.30

0.15

2.30

(0.5)

0.2+0.05

* Soldering fillet surface is not formed

because the sides of the pins are not

plated.

Semiconductor Ltd.

+

-

Vref with

soft start

PWM/PFM

Controller

Phase

Compensation

+

-

Logic

Buffer,

Driver

Current Limit &

Feedback

Ramp Wave

Generator,

OSC

DCOUT

AVDD

-

+

U.V.L.O

LX

VROUT

AGND

+

-

Current

Li mi t

Vref

MODE

MODE

CONTROL

eac h

circuit

+

-

VDOUT

PGND

CE

ON/OFF,

CONTROL

eac h

circuit

Vref

PVDD

SENSE

(VDD or DCOUT or VROUT)

Data Sheet

3