Datasheet > RAA211820

RAA211820

更新时间： 2024-11-30 14:57:43

品牌	Logo	应用领域
瑞萨 - RENESAS		/
页数	文件大小	规格书
24页	2253K
描述
Integrated FET 75V, 2A Synchronous Buck Regulator with Internal Compensation and Programmable Frequency

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RAA211820 数据手册

Datasheet

RAA211820

4.5V to 75V, 2A, DC/DC Synchronous Step-Down Regulator w/ Internal Compensation and Adjustable Frequency

The RAA211820 is a DC/DC synchronous step-down

(Buck) regulator that supports a 4.5V to 75V input

voltage range and adjustable output voltage. It can

deliver up to continuous 2A of continuous output

Features

▪ Wide input voltage range: 4.5V to 75V

▪ Adjustable output voltage: 0.8V to 90% of VIN

▪ Up to 2A of continuous output current

current with premium load and line regulation

performance.

▪ Default 400kHz switching frequency and

programmable switching frequency range from

200kHz to 800kHz

The RAA211820 uses peak-current mode control

architecture. Its PWM switching frequency is

programmable to provide the best trade-off between

transient response and efficiency. It also supports

PFM operation and DEM to maximize light load

efficiency, in addition to an external bias LDO input to

further reduce power dissipation across the load

range. The regulator also has an internal loop

compensation circuit to reduce the external

component count and BOM cost.

▪ ±1% Load regulation accuracy from -40°C to

125°C, ±0.5% Load regulation accuracy at 25°C

▪ 95µA typical quiescent current

▪ Internal compensation

▪ Internal 0.5ms soft-start in QFN

▪ External programmable soft-start (HTSSOP)

▪ PFM operation and DEM at light load

▪ Integrated external bias LDO

▪ Power good indicator

The RAA211820 provides useful functions such as

internal or programmable soft-start and power good

indicator. For safe operation, the RAA211820 also

offers protection features such as cycle-by-cycle peak

and valley current limit, input voltage UVLO, output

voltage undervoltage (short-circuit) protection, and

thermal shutdown.

▪ Integrated MOSFET r

(typical):

DS(ON)

155mΩ/80mΩ (QFN); 200mΩ/95mΩ (TSSOP)

▪ Cycle-by-cycle peak and valley current limit

▪ Input voltage UVLO and output voltage

undervoltage (short-circuit) protection

▪ Thermal Shutdown

Applications

▪ Available in 20 Ld QFN 4mm × 3.5mm and 16 Ld

▪ Industrial power systems

HTSSOP packages

▪ Distributed power supplies and general-purpose

point-of-load

▪ Telecommunication base station power supplies

▪ High-voltage single-board systems

V_IN

Up to 75V

C_IN2

VIN

BST

C_BOOT

V_OUT

C_IN1

R_IN1

R_IN2

C_OUT1

22µF

C_OUT2

22µF

RAA211820

R_FB1

PGND

VCC

R_FB2

EBIAS

AGND

VCC

C_VCC

Figure 1. Typical Application Circuit

R16DS0185EU0101 Rev.1.01

Oct 12, 2022

Page 1

12 3 4 5 6 7...24

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