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