RT2856 Datasheet, PDF (1/19 Pages) Richtek Technology Corporation – Synchronous Step-Down Converter

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RT2856
6A, 18V, Synchronous Step-Down Converter
General Description
The RT2856 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 6A output
current from a 4.5V to 18V input supply. The RT2856
current-mode architecture with external compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors. Cycle-by-cycle
current limit provides protection against shorted outputs
and soft-start eliminates input current surge during start-
up. Fault condition protections include output under-voltage
protection, output over-voltage protection, and over-
temperature protection. The low current shutdown mode
provides output disconnection, enabling easy power
management in battery-powered systems.
Features
 Low R_DS(ON) Power MOSFET Switches 26mΩ/19mΩ
 Input Voltage Range : 4.5V to 18V
 Adjustable Switching Frequency : 200kHz to 1.6MHz
 Current-Mode Control
 Synchronous to External Clock : 200kHz to 1.6MHz
 Accurate Voltage Reference 0.8V ± 1%, Over −40°C
to 85°C
 Monotonic Start-Up into Pre-biased Outputs
 Adjustable Soft-Start
 Power Good Indicator
 Under-Voltage and Over-Voltage Protection
 Input Under-Voltage Lockout
 RoHS Compliant and Halogen Free
Marking Information
00= : Product Code
00=YM
DNN
YMDNN : Date Code
Applications
 High Performance Point of Load Regulation
 Notebook Computers
 High Density and Distributed Power Systems
Simplified Application Circuit
V_IN
Enable
PGOOD
C_IN
R_OSC
C_SS
RT2856
VIN
BOOT
PVIN
LX
EN
PGOOD
FB
COMP
RT/SYNC
SS/TR
GND
C_BOOT
L
R_COMP1
C_COMP2
R1
C_COMP1 ^R2
V_OUT
C_OUT
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS2856-10 October 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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