Datasheet > RT7239

RT7239

更新时间： 2024-01-02 03:11:35

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
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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

RT7239 数据手册

RT7235/36/39/40

Function Block Diagram

VCC*

VREG5

BOOT

POR &

Reg

Min.

VREG5

Off-Time

VIN

VBIAS

REF

Control

Driver

UV & OV

PGND

GND*

REG5

Ripple

Gen.

2µA

Comparator

PGOOD*

Comparator

0.9 x V

REF

On-Time

VS*

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

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

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

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

Operation

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

converter with advanced constant on-time control mode.

Using the ACOT^TMcontrol mode can reduce the output

capacitance and provide fast transient response. It can

minimize the component size without additional external

compensation network.

Current Protection

The inductor current is monitored via the internal switches

in cycle-by-cycle. Once the output voltage drops under

UV threshold, the device will enter latch mode for TSSOP-

14 (Exposed Pad), and hiccup mode for WDFN-10L 3x3.

UVLO Protection

Power Good

To protect the chip from operating at insufficient supply

voltage, the UVLO is needed. When the input voltage of

VCC is lower than the UVLO falling threshold voltage, the

device will be latch-off.

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

After soft-start is finished, the power good function will be

activated. When the FB is activated, the PGOOD will

become an open-drain output. If the FB is below, the

PGOOD pin will be pulled low.

Output Discharge Control

(for TSSOP-14 (Exposed Pad) only)

Internal Regulator

When EN pin is low, the RT7235/36 will discharge the

output with an internal 50Ω MOSFET connected between

V_OUTto GND pin.

The regulator provides 5V power to supply the internal

control circuit. Connecting a 1μF ceramic capacitor for

decoupling and stability is required.

Thermal Shutdown

Soft-Start

When the junction temperature exceeds the OTP

threshold value, the IC will shut down the switching

operation. Once the junction temperature cools down and

is lower than the OTP lower threshold, the converter will

automatically resume switching

In order to prevent the converter output voltage from

overshooting during the startup period, the soft-start

function is necessary. The soft-start time is adjustable

and can be set by an external capacitor.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS7235/36/39/40-00 March 2013

1 2 345 6 7...18

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