®
RT5785A/B
2A, 6V, 1.5MHz, 25μA IQ, ACOTTM Synchronous Step-Down
Converter
General Description
Features
Dramatically Fast Transient Response
Steady 1.5MHz 200kHz Switching Frequency
Very Low Input Quiescent and Shutdown Currents
Advanced COT Control Loop Design
Optimized for Ceramic Output Capacitors
2.5V to 6V Input Voltage Range
The RT5785A/B is a high-performance,Advanced Constant
On-Time (ACOTTM) monolithic synchronous step-down
DC-DC converter that can deliver up to 2Aoutput current
from a 2.5V to 6V input supply. The proprietary ACOT
control architecture features quick transient response and
provides stable operation with small ceramic output
capacitors and without complicated external
compensation. The switching ripple voltage is easily
smoothed–out by small package filtering elements due
to a constant switching frequency of 1.5MHz and the
maximum duty cycle of 100% allows the device to operate
at low dropout use. With internal low on-resistance power
switches and extremely low quiescent current, the
RT5785A/B displays excellent efficiency and good behavior
across a range of applications.
Accurate Voltage Reference 0.6V 2%
Integrated 100mΩ/60mΩ MOSFETs
Internal Start-Up into Pre-Biased Outputs
Power Good Indicator
Enable Control
Over-Current and Over-Temperature Protections
Under-Voltage Protection with Hiccup Mode
RoHS Compliant and Halogen Free
Applications
Mobile Phones and HandheldDevices
Cycle-by-cycle current limit provides protection against
shorted outputs, input under-voltage lock-out, output
under-voltage protection, and thermal shutdown provide
safe and smooth operation in all operating conditions. The
RT5785A/B is available in the TSOT-23-8 (FC) package.
STB, Cable Modem, and xDSL Platforms
WLANASIC Power / Storage (SSDand HDD)
General Purpose for POL LV Buck Converter
Simplified Application Circuit
L
V
IN
VIN
RT5785A/B
V
LX
FB
OUT
C
IN
R
PGOOD
R1
C
OUT
C
FF
PGOOD
Enable
PGOOD
EN
R2
VOUT
AGND
PGND
Copyright 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS5785A/B-02 April 2017
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
