RAA212421 datasheet(4/34 Pages) RENESAS

Part #	RAA212421

Description	3V to 40V Input, 1.1A Synchronous Buck Regulator with Integrated 500mA LDO

PDF	34 Pages

Scroll/Zoom	100%

Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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4 / 34 page

FN9309 Rev.3.00

Page 4 of 34

Jul 8, 2019

RAA212421

1. Overview

1.2

Block Diagram

Table 1. External Component Selection

VOUT1

(V)

(µH)

COUT1

(µF)

(kΩ)

CFF

(pF)

RFS

(kΩ)

RCOMP

(kΩ)

CCOMP

(pF)

2 x 22

90.9

4.75

4.7

115

200

470

47 + 22

90.9

12.4

DNP (Note 1)

130

470

3.3

47 + 22

90.9

DNP (Note 1)

120

470

2.5

47 + 22

90.9

28.7

DNP (Note 1)110

470

1.8

47 + 22

90.9

45.5

DNP (Note 1)90

470

Note:

1. Connect FS1 to VCC1.

Figure 5. Functional Block Diagram

Gate Drive

and Dead

Time

Bias

LDO

Oscillator

PFM

Current

Set

Fault

Logic

450mV/T Slope

Compensation

(PWM only)

500mV/A

Current Sense

PWM/PFM

Select Logic

EN/Soft-

Start

Zero Current

Detection

PWM

600mV VREF

150k

54pF

Internal

Compensation

Power-

Good

Logic

InternaL = 50µA/V

External = 230µA/V

GND1

LX1

BOOT1

VCC1

VIN1

EN1

FB1

FS1

SYNC1

COMP1

PG1

GND

Package

Paddle

SS1

Control Logic

Thermal

Sensor

Reference

Soft-Start

FET Driver with

Current Limit

EN2

SS2

VOUT2

FB2

VIN2

GND2

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