XC9510A1333 TOREX [Torex Semiconductor], XC9510A1333 Datasheet

XC9510A1333

Manufacturer Part Number

XC9510A1333

Description

Synchronous Step-Down DC/DC Converter With Built-In LDO Regulator Plus Voltage Detector

Manufacturer

TOREX [Torex Semiconductor]

Datasheet

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XC9510

Synchronous Step-Down DC/DC Converter

with Built-In LDO Regulator In Series Plus Voltage Detector

■TYPICAL APPLICATION CIRCUIT

■GENERAL DESCRIPTION

The XC9510 series consists of a step-down DC/DC converter and a high-speed LDO regulator connected in series with the

DC/DC converter's output. A voltage detector is also built-in. A highly efficient, low noise output is possible since the

regulator is stepped-down further from the DC/DC output.

The DC/DC converter block incorporates a P-channel driver transistor and a synchronous N-channel switching transistor.

With an external coil, diode and two capacitors, the XC9510 can deliver output currents up to 800mA at efficiencies over 90%.

The XC9510 is designed for use with small ceramic capacitors. A choice of three switching frequencies are available, 300

kHz, 600 kHz, and 1.2 MHz. Output voltage settings for the DC/DC is set-up internally in 100mV steps within the range of 1.6V

to 4.0V(±2.0%) and for the VR are set-up internally within the range of 0.9V to 4.0V (±2.0%). For the VD, the range is of

0.9V to 5.0V (±2.0%). The soft start time of the series is internally set to 5ms. With the built-in U.V.L.O. (Under Voltage Lock

Out) function, the internal P-channel driver transistor is forced OFF when input voltage becomes 1.4 V or lower. The

operational states of the DC/DC and the regulator blocks can be changed by inputting three kinds of voltage level via the

CE/MODE pin. The functions of the MODE pin can be selected via the external control pin to switch the DC/DC control mode

and the disable pin to shut down the regulator block.

■APPLICATIONS

●CD-R / RW, DVD

●HDD

●PDAs, portable communication modem

●Cellular phones

●Palmtop computers

●Cameras, video recorders

Series

■FEATURES

DC/DC Converter with Built-in LDO and VD Function

Input Voltage Range

Low ESR Capacitor

VD Function

Package

Output Voltage Range : 1.6V ~ 4.0V (Accuracy ±2%)

Output Current

Controls

Oscillation Frequency : 300kHz, 600kHz, 1.2MHz

Regulator Input

Output Voltage Range : 0.9V ~ 4.0V (Accuracy±2%)

Current Limit

Dropout Voltage

High Ripple Rejection : 60dB @1kHz (V

■TYPICAL PERFORMANCE

CHARACTERISTICS

: 2.4V ~ 6.0V

: Ceramic capacitor compatible

: Three Sensing Options for Either

: SOP-8

: 800mA,

: PWM or PWM/PFM Selectable

: Serial Input from DC/DC output

: 600mA

: 160mV @ I

VDD, DCOUT or VROUT

N-ch open drain output

OUT

=2.8V)

OUT

=200mA

OUT

=2.8V)

ETR1007_001

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