RTQ2820A中文資料立锜科技數(shù)據(jù)手冊PDF規(guī)格書

1 General Description

The RTQ2820A is a high-performance, synchronous

step-down converter that can deliver up to 20A output

current with a wide input supply voltage range of 3.5V

to 17V. The device integrates low RDS(ON) power

MOSFETs, an accurate 0.6V ? 1% reference over the

full operating junction temperature range, and an

integrated diode for the bootstrap circuit, offering a very

compact solution.

The RTQ2820A adopts Advanced Constant-On-Time

(ACOT?

) control architecture that provides excellent

transient performance and reduces the count of external

components. In steady states, the ACOT?

can operate

at nearly constant switching frequency over line, load

and output voltage ranges, making the EMI filter design

easier.

The device offers a variety of functions to provide more

design flexibility. The selectable switching frequency,

current limit level, PWM operation modes make the

RTQ2820A easy-to-use over wide application range. An

independent enable control input pin and power-good

indicator are also provided for easy sequence control.

The device provides a programmable soft-start-up by an

external capacitor connected to the SS/TR pin to control

the inrush current during start-up.

The RTQ2820A provides complete protection functions

including input undervoltage lockout, output

undervoltage protection, output overvoltage protection,

overcurrent protection, and thermal shutdown. The

RTQ2820A is available in a thermally enhanced WQFN21TL 3x4 (FC) package.

The recommended junction temperature range is ?40?C

to 150?C.

2 Features

? Wide Input Voltage Range

? 2.7V to 17V with External 3.3V VCC Bias

? 3.5V to 17V with Internal VCC Bias

? Output Voltage from 0.6V to 5.5V

? 0.6V ? 0.5% Voltage Reference from 0?C to 70?C

Junction Temperature Range

? 0.6V ? 1% Voltage Reference from ?40?C to 150?C

Junction Temperature Range

? ACOT? Control for Excellent Transient

Performance

? Stable with Ceramic Output Capacitors

? Selectable FCCM or PSM Operation at Light Load

? Selectable Operation Switching Frequency

(600KHz/800KHz/1MHz)

? Non-Latch for OCP, UVP, UVLO, and OTP Faults,

Latch Off for OVP

? Differential Remote Sense Voltage for High

Output Accuracy

? Power-Good Indicator

? Enable Control

? Programmable Soft-Start Time with a Default 1ms

? Programmable Valley Current Limit Level

? Monotonic Start-Up into Pre-Biased Outputs

? Output Voltage Tracking

? Small 21T-Lead WQFN (3x4) (FC) Package

3 Applications

? Servers, Storage, and Network Equipment

? Telecom Infrastructure

? Point of Load (POL) Power Modules

? High Density DC-DC Converters