RT2660 Datasheet, PDF (1/18 Pages) Richtek Technology Corporation – Synchronous Step-Down Converter

®
RT2660
6A, 6V, Synchronous Step-Down Converter with REFIN
General Description
The RT2660 in thermally enhanced VQFN-20L 3.5x4
package is a full featured 6V, 6A synchronous step-down
DC/DC converter designed specifically for Double Data
Rate (DDR) memory termination, which provides a
continuous 6A sink and source current and fixed 1/2 DDQ
at output. The current mode COT architecture with
external compensation allows the transient response to
be optimized over a wide range of loads and achieves
nearly constant switching frequency over line, load, and
output voltage ranges. The multiple sets of over-current
limit and switching frequency offer an optimized power
chain for application design.
Efficiency is maximized through the integrated 20mΩ/
10mΩ MOSFETs, and cycle-by-cycle current limit provides
protection against shorted outputs. Output external
tracking function, output soft discharge, power good
indicating, output droop support are all featured in the
RT2660. In addition, the device is specified from 0°C to
85°C to perform an excellent regulation with an accurate
1% reference voltage over temperature.
Features
 Continuous 6A Sink or Source Output Current ability
and Droop Design for DDR Memory Termination
Applications
 Low R_DS(ON) Power N-MOSFET Switches 20mΩ/
10mΩ
 Input Voltage Range : 1V to 6V
 Output Adjustable from 0.6V to 2V
 Current-Mode Constant On-Time Control Design
Enables Fast Transient Response
 Supports All MLCC Output Capacitor and SP/
POSCAP with Robust Loop Stabilization
 Selectable 600kHz or 1MHz Switching Frequency
 Supports Pre-Biased Start-Up
 Selectable Over-Current Protection
 Various Operation Mode Selection for Different
Application Requirements
 External Tracking Start-Up Application
 Enable Input Control and Power Good Indicator
 Under-Voltage and Over-Voltage Protection
Applications
 DDR-2/3/4 VTT Regulation (1/2V_DDQ) for Enterprise
Servers, Ethernet Switches and Routers, Global Storage,
GSM Base Station, and Industrial equipments
 Enterprise POL (using precision internal VREF)
Simplified Application Circuit
V_IN
Enable
VIN
BOOT
C_IN
RT2660
EN
SW
Mode
R_COMP ^CCOMP
MODE
COMP
C_REF
R2
VREF
R1
REFIN
VOUT
V5IN
PGOOD
PGND
GND
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2660-00 September 2015
C_BOOT
L
C_OUT
V_OUT
C_V5IN
R_PGOOD
V_V5IN
PGOOD
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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