Datasheet > RT7239

RT7239

更新时间： 2024-01-01 15:07:09

品牌	Logo	应用领域
立锜 - RICHTEK		转换器
页数	文件大小	规格书
18页	302K
描述
5A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter

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技术参数
数据手册

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RT7239 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	18	Number of Outputs：	1
Vout (min) (V)：	0.765	Vout (max) (V)：	8
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	5	Current Limit (typ) (A)：	6.85
Freq (typ) (kHz)：	650	Freq (min) (kHz)：
Freq (max) (kHz)：		Ext Sync：	No
Ron_HS (typ) (mOhm)：	120	Ron_LS (typ) (mOhm)：	35
Iq (typ) (mA)：	1	Features：	ACOT Control;Adjustable Soft-Start;Cycle-by-Cycle Current Limit;Enable Input;Fast Transient Response;Force PWM;OCP;Stable with Ceramic Capacitor
Package Type：	PSOP-8	Datasheet：	https://datasheet5.oss-cn-shanghai.aliyuncs.com/datasheets/richtek/DS7235_36_39_40-09.pdf

RT7239 数据手册

RT7235/36/39/40

5A, 18V, 650kHz, ACOT^TMSynchronous Step-Down Converter

General Description

Features

^zACOT^TMMode Enables Fast Transient Response

^z4.5V to 18V Input Voltage Range

^z5A Output Current

The RT7235/36/39/40 is a synchronous step-down DC/

DC converter withAdvanced Constant On-Time (ACOT^TM)

mode control. It achieves high power density to deliver up

to 5Aoutput current from a 4.5V to 18V input supply. The

proprietary ACOT^TMmode offers an optimal transient

response over a wide range of loads and all kinds of ceramic

capacitors, which allows the device to adopt very low ESR

output capacitor for ensuring performance stabilization. In

addition, RT7235/36/39/40 keeps an excellent constant

switching frequency under line and load variation and the

integrated synchronous power switches with theACOT^TM

mode operation provides high efficiency in whole output

current load range. Cycle-by-cycle current limit provides

an accurate protection by a valley detection of low side

MOSFET and external soft-start setting eliminates input

current surge during startup. Protection functions include

thermal shutdown for RT7235/36/39/40, output Under

Voltage Protection (UVP) / Over Voltage Protection (OVP)

for RT7235/36. When the UVP/OVP is triggered, the device

will enter latch mode for TSSOP-14 (Exposed Pad), and

hiccup mode for WDFN-10L 3x3.

^z35mΩ Internal Low Site N-MOSFET

^zAdvanced Constant On-Time Control

^zSupport All Ceramic Capacitors

^zUp to 95% Efficiency

^z650kHz Switching Frequency at all Load Current

(RT7235, RT7239)

^zDiscontinuous Operating Mode at Light Load

(RT7236, RT7240)

^zAdjustable Output Voltage from 0.765V to 8V

^zAdjustable Soft-Start

^zCycle-by-Cycle Current Limit

^zInput Under Voltage Lockout

^zThermal Shutdown

^zRoHS Compliant and Halogen Free

Applications

z Industrial and Commercial Low Power Systems

z Computer Peripherals

z LCDMonitors and TVs

The RT7235/36 are available in TSSOP-14 (Exposed Pad)

and WDFN-10L 3x3 packages, and the RT7235 is operated

in forced continuous conduction mode.

z Green Electronics/Appliances

z Point of Load Regulation for High-Performance DSPs,

FPGAs, and ASICs

The RT7239/40 are available in the SOP-8 (Exposed Pad)

package, and the RT7239 is operated in forced continuous

conduction mode.

Simplified Application Circuit

RT7235/36/39/40

VIN

OUT

VCC*

BOOT

Enable

PGOOD*

Power GOOD

PGND

VREG5

VS*

* : VCC pin for TSSOP-14 (Exposed Pad) only.

VS pin for TSSOP-14 (Exposed Pad) only.

GND pin for TSSOP-14 (Exposed Pad) only.

GND*

PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.

is a registered trademark of Richtek Technology Corporation.

DS7235/36/39/40-00 March 2013

www.richtek.com

12 3 4 5 6 7...18

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