Datasheet > RT7257EN

RT7257EN

更新时间： 2022-06-24 15:44:50

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
15页	225K
描述
3A, 17V, 340kHz Synchronous Step-Down Converter

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数据手册

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RT7257EN 数据手册

Preliminary

RT7257E

Typical Application Circuit

VIN

BOOT

RT7257E

4.5V to 17V

100nF

BOOT

10µF x 2

10µH

OUT

3.3V

Chip Enable

75k

OUT

22µF x 2

12k

4.7nF

0.1µF

24k

4, 9 (Exposed Pad)

COMP

GND

Open

Table 1. Recommended Components Selection

V_OUT(V) R1 (kΩ) R2 (kΩ) R_C(kΩ) C_C(nF)

L (μH)

C_OUT(μF)

11.8

8.2

3.6

4.7

22 x 2

6.8

3.6

3.3

2.5

1.5

1.2

25.5

10.5

2.7

Functional Pin Description

Pin No.

Pin Name

Pin Function

Bootstrap for High Side Gate Driver. Connect a 0.1μF or greater ceramic

capacitor from BOOT to SW pins.

BOOT

Input Supply Voltage, 4.5V to 17V. Must bypass with a suitably large ceramic

capacitor.

VIN

Switch Node. Connect this pin to an external L-C filter.

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

GND for maximum power dissipation.

GND

9 (Exposed Pad)

Feedback Input. It is used to regulate the output of the converter to a set value

via an internal resistive voltage divider.

Compensation Node. 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.

COMP

Enable Input. A logic high enables the converter; a logic low forces the

RT7257E into shutdown mode reducing the supply current to less than 3μA.

Attach this pin to VIN with a 100kΩ pull up resistor for automatic startup.

Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor

from SS to GND to set the soft-start period. A 0.1μF capacitor sets the

soft-start period to 13.5ms.

123 4 5 6 7...15

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