Datasheet > RT7273

RT7273

更新时间： 2024-02-13 09:59:24

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
23页	342K
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技术参数
数据手册

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RT7273 技术参数

Status：	Active	Vin (min) (V)：	4.5
Vin (max) (V)：	18	Number of Outputs：	3
Vout (min) (V)：	0.8	Vout (max) (V)：	17
Preset Vout (V)：		Output Adj. Method：	Resistor
Iout (max) (A)：	2.5;2.5;3.5	Current Limit (typ) (A)：	4;4;5
Freq (typ) (kHz)：	500	Freq (min) (kHz)：	300
Freq (max) (kHz)：	2200	Ext Sync：	Yes
Ron_HS (typ) (mOhm)：	95	Ron_LS (typ) (mOhm)：	50
Iq (typ) (mA)：	20	Features：	Adjustable Current Limit;Adjustable Frequency;Adjustable Soft-Start;Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;External Synchronization;Force PWM;Internal Compensation;Power Good;Stable with Ceramic Capacitor;UVP
Package Type：	WQFN6x6-40

RT7273 数据手册

RT7273

Pin No.

Pin Name

Pin Function

Current Limit Setting for CH 1. Connect a resistor from RLIM to GND to set

the peak current limit on the output inductor.

RLIM1

Enable Control Input for CH 1. A low level signal on this pin disables it. If this

pin is left open, a weak internal pull-up to VCC will allow automatic enables.

EN1

Bootstrap Supply for High-Side Gate Driver of CH 1. Connect a 0.1F

ceramic capacitor from this pin to LX1.

BOOT1

VIN1

Power Input for CH 1 and Connected to High-Side MOSFET Drain. Place a

10F ceramic capacitor close to this pin.

14, 15

16, 17

LX1

LX2

VIN2

Switch Node of CH 1.

Switch Node of CH 2.

Power Input for CH 2. Place a 10F ceramic capacitor close to this pin.

Bootstrap Supply for High-Side Gate Driver of CH 2. Connect a 0.1F

ceramic capacitor from this pin to LX2.

BOOT2

EN2

Enable Control Input for CH 2. A low level signal on this pin disables it. If this

pin is left open, a weak internal pull-up to VCC will allow automatic enables.

Current Limit Setting for CH 2. Connect a resistor from RLIM2 to GND to set

the peak current limit on the output inductor.

RLIM2

SS2

Soft-Start Time Setting for CH 2. Connect a capacitor to this pin and GND

for soft-start time setting.

Compensation Node for CH 2. COMP is used to compensate the regulation

control loop. Connect a series RC network from COMP to GND. In some

cases, an additional capacitor from COMP to GND is required.

COMP2

FB2

Feedback Voltage Input for CH 2.

LOWP

Discontinuous Operation Mode Input (Active High).

26, 30, 31, 35,

41 (Exposed Pad)

Ground. The exposed pad must be connected to GND and soldered to a

large PCB copper plane for maximum power dissipation.

GND

PGOOD

PVCC

Power Good Indicator Output with Open-Drain.

5V Power Supply Output. Connect a capacitor 10F between this pin and

GND.

4.6V Power Supply Output. Connect a capacitor 3.3F between this pin and

GND.

VCC

32, 33, 34

36, 37

VINR

LX3

Supply Voltage Input for Internal Control Circuit.

Switch Output for CH 3.

VIN3

Power Input for CH 3. Place a 10F ceramic capacitor close to this pin.

Bootstrap Supply for High-Side Gate Driver of CH 3. Connect a 0.1F

ceramic capacitor from this pin to LX3.

BOOT3

EN3

Enable Control Input for CH 3. A low level signal on this pin disables it. If this

pin is left open, a weak internal pull-up to VCC will allow automatic enables.

is a registered trademark of Richtek Technology Corporation.

DS7273-04 October 2014

www.richtek.com

1 234 5 6 7...23

中文翻译

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RT7281	RICHTEK	获取价格	2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
RT7285	RICHTEK	获取价格	暂无描述

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