XC9237A3ACEL datasheet, PDF - EEWORLD Datasheet

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XC9237A3ACEL: Description600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters; CategoryPower/power management The power supply circuit; File Size767KB，28 Pages; ManufacturerTOREX; Websitehttp://www.torex.co.jp/chinese/; Environmental Compliance

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XC9237A3ACEL Overview

600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters

XC9237A3ACEL Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	TOREX
package instruction	,
Reach Compliance Code	compli
Humidity sensitivity level	1

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XC9235/XC9236/XC9237

Series

600mA Driver Tr. Built-In, Synchronous Step-Down DC/DC Converters

ETR0514-007

The XC9235/XC9236/XC9237 series is a group of synchronous-rectification type DC/DC converters with a built-in 0.42Ω

P-channel driver transistor and 0.52ΩN-channel switching transistor, designed to allow the use of ceramic capacitors. The ICs

enable a high efficiency, stable power supply with an output current of 600mA to be configured using only a coil and two

capacitors connected externally. Operating voltage range is from 2.0V to 6.0V. Output voltage is internally set in a range from

0.8V to 4.0V in increments of 50mV (accuracy:

±2.0%).

With the built-in oscillator, ether 1.2MHz or 3.0MHz can be selected

for suiting to your particular application. As for operation mode, the XC9235 series is PWM control, the XC9236 series is

automatic PWM/PFM switching control and the XC9237 series can be manually switched between the PWM control mode and

the automatic PWM/PFM switching control mode, allowing fast response, low ripple and high efficiency over the full range of

loads (from light load to heavy load).

The soft start and current control functions are internally optimized. During stand-by, all circuits are shutdown to reduce

current consumption to as low as 1.0μA or less. With the built-in UVLO (Under Voltage Lock Out) function, the internal

P-channel driver transistor is forced OFF when input voltage becomes 1.4V or lower.

The XC9235B/XC9236B/XC9237B series provide short-time turn-on by the soft start function internally set in 0.25 ms (TYP).

The XC9235B(C)/XC9236B(C)/XC9237B(C) integrate C

auto discharge function which enables the electric charge at the output

capacitor C

to be discharged via the internal auto-discharge switch located between the L

and V

pins. When the devices

enter stand-by mode, output voltage quickly returns to the V

level as a result of this function.

Two types of package SOT-25 and USP-6C are available.

■GENERAL

DESCRIPTION

☆GreenOperation

Compatible

■APPLICATIONS

●Mobile

phones

●Bluetooth

equipment

●PDAs,

portable communication modem

●Portable

games

●Digital

cameras, video cameras

●Cordless

phones

●Notebook

computers

■FEATURES

P-ch Driver Transistor Built-In

N-ch Driver Transistor Built-In

Input Voltage

Output Voltage

High Efficiency

Output Current

Oscillation Frequency

Maximum Duty Cycle

Control Methods

: ON resistance 0.42Ω

: ON resistance 0.52Ω

: 2.0V ~ 6.0V

: 0.8V ~ 4.0V

: 92% (TYP.)

: 600mA

: 1.2MHz, 3.0MHz (+15%)

: 100%

: PWM (XC9235)

PWM/PFM Auto (XC9236)

PWM/PFM Manual (XC9237)

Soft-Start Circuit Built-In

Current Limiter Circuit Built-In (Constant Current & Latching)

Low ESR Ceramic Capacitor Compatible

Packages

: SOT-25, USP-6C

High Speed Discharge

（XC9235B(C)/XC9236B(C)/XC9237B(C)

Series）

High Speed Soft Start

（XC9235B/XC9236B/XC9237B

Series）

* Performance depends on external components and wiring on the PCB.

■TYPICAL

APPLICATION CIRCUIT

■TYPICAL

PERFORMANCE

CHARACTERISTICS

●Efficiency

vs. Output Current（FOSC=1.2NHz, V

OUT

=1.8V）

100

Efficiency: EFFI (%)

Efficency:EFFI(%)

PWM/PFM Automatic Sw itching Control

0.1

2.4V

VIN= 4.2V

3.6V

PWM Control

VIN= 4.2V

3.6V

2.4V

100

1000

Output Current:IOUT(mA)

1/28

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