Datasheet > RT6550A

RT6550A

更新时间： 2024-02-22 09:25:15

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
16页	243K
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技术参数
数据手册

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RT6550A 技术参数

Status：	Active	Vs (typ) (V)：	12
Vin (min) (V)：	5	Vin (max) (V)：	25
Vout (min) (V)：	2	Vout (max) (V)：	5.5
Preset Vout (V)：		Output Adj. Method：	Resistor
Accuracy (+/- %)：		Freq (typ) (kHz)：	300
Freq (min) (kHz)：	240	Freq (max) (kHz)：	360
Iq (typ) (mA)：	0.42	Features：	ACOT Control;Adjustable Current Limit;Built-in Bootstrap Switch;COT Control;Cycle-by-Cycle Current Limit;Enable Input;OCP;OVP;UVP
Package Type：	WDFN3x3-10

RT6550A 数据手册

RT6550A

Functional Block Diagram

VO_DIS

VIN

Shutdown

Discharge

Power On

Reset

LDO5

113%

VREF

OVP

UVP

VREF

Over-

Temperature

Protection

Control & Protection Logic

52%

VREF

Soft

Start &

Slew

Rate

Control

BOOT

UGATE

PHASE

TON

Generator

PWM

CMP

Driver

Logic

LDO5

Enable

Logic

LGATE

GND

10µA

Current

limit

Short during CCM

X(1/8)

Operation

current to the load exceeds the average output inductor

current, the output voltage falls and eventually crosses

the under-voltage protection threshold, inducing IC

shutdown.

The RT6550Aincludes constant on-time synchronou step-

down controller and linear regulator.

Buck Controller

In normal operation, the high-side N-MOSFET is turned

on when the output is lower than VREF, and is turned off

after the internal one-shot timer expires. While the high-

sideN-MOSFET is turned off, the low-sideN-MOSFET is

turned on to conduct the inductor current until next cycle

begins.

Over-Voltage Protection (OVP) and Under-Voltage

Protection (UVP)

The channel output voltage is continuously monitored for

over-voltage and under-voltage conditions. When the

output voltage exceeds over-voltage threshold (113% of

VOUT), UGATE goes low and LGATE is forced high; when

it is less than 52% of reference voltage, under-voltage

protection is triggered and then both UGATE and LGATE

gate drivers are forced low. The controller is latched until

EN is reset or LDO5 is re-supplied.

Soft-Start

For internal soft-start function, an internal current source

charges an internal capacitor to build the soft-start ramp

voltage. The output voltage will track the internal ramp

voltage during soft-start interval.

LDO5

Current Limit

The LDO5 can be power on by EN. The linear regulator

LDO5 provides 5V regulated output.

The current limit circuit employs an unique “valley” current

sensing algorithm. If the magnitude of the current sense

signal at PHASE is above the current limit threshold, the

PWM is not allowed to initiate a new cycle. Thus, the

is a registered trademark of Richtek Technology Corporation.

DS6550A-00 September 2016

www.richtek.com

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