Datasheet > RT6296B

RT6296B

更新时间： 2024-04-09 19:00:18

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
14页	1027K
描述
2A, 17V Current Mode Synchronous Step-Down Converter

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RT6296B 数据手册

RT6296B

Functional Block Diagram

VIN

PVCC

Internal

Current

Sense

Regulator

UVLO

BOOT

UVLO

Shutdown

Comparator

BOOT

EN/SYNC

Logic &

Protection

Control

Power

1.4V

Stage &

Deadtime

Control

0.4V

Comparator

HS Switch

Current

Comparator

1pF

Current

Sense

LS Switch

Current

Comparator

50pF

400k

GND

Slope

Compensation

0.807V

11µA

Oscillator

Operation

pin is pulled to low-level over 8s, the IC will shut down.

The RT6296B can be synchronized with an external

clock ranging from 200kHz to 2MHz applied to the

EN/SYNC pin. The external clock duty cycle must be

from 20% to 80% with logic-high level = 2V and

logic-low level = 0.8V.

Under Voltage Lockout Threshold

The IC includes an input Under Voltage Lockout

Protection (UVLO). If the input voltage exceeds the

UVLO rising threshold voltage (3.9V), the converter

resets and prepares the PWM for operation. If the input

voltage falls below the UVLO falling threshold voltage

(3.25V) during normal operation, the device stops

switching. The UVLO rising and falling threshold

voltage includes a hysteresis to prevent noise caused

reset.

Internal Regulator

The internal regulator generates 5V power and drive

internal circuit. When VIN is below 5V, PVCC will drop

with VIN. A capacitor(>0.1F) between PVCC and

GND is required.

Chip Enable

External Soft-Start Function

The EN pin is the chip enable input. Pulling the EN pin

low (<1.1V) will disable the device. During shutdown

mode (<0.4V), the RT6296B’s quiescent current drops

to lower than 1A. Driving the EN pin high (>1.6V) will

turn on the device.

The RT6296B provides external soft-start function. The

soft-start function is used to prevent large inrush

current while converter is being powered-up. The

soft-start timing can be programmed by the external

capacitor between SS pin and GND. The Chip provides

a 11A charge current for the external capacitor 100s

after EN rising. As shown in Figure 1, output voltage

Operating Frequency and Synchronization

The internal oscillator runs at 500kHz (typ.) when the

EN/SYNC pin is at logic-high level (>1.6V). If the EN

starts to rise after 0.4 x t_SS

is a registered trademark of Richtek Technology Corporation.

DS6296B-03 July 2018

www.richtek.com

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