®
RT6215A/B
24V, 2A, 500kHz, ACOTTM Step-Down Converter in 8 Pin TSOT-23
General Description
Features
2A Converter With Built-In 100mΩ/85mΩ Low
RDS(ON) Power FETs
The RT6215A/B is a simple, easy-to-use, 2Asynchronous
step-downDC-DC converter with an input supply voltage
range of 4.5V to 24V. The device build-in an accurate
0.791V reference voltage and integrates low RDS(ON) power
MOSFETs to achieve high efficiency in a SOT23-8
package.
Input Supply Voltage Range : 4.5V to 24V
Output Voltage Range : 0.791V to 5V
Advanced Constant On-Time (ACOTTM) Control
Ultrafast Transient Response
No Needs For External Compensations
Optimized for Low-ESR Ceramic Output Capacitors
0.791V 1.5% High-Accuracy Feedback Reference
Voltage
The RT6215A/B adopts Advanced Constant On-Time
(ACOTTM) control architecture to provide an ultrafast
transient response with few external components and to
operate in nearly constant switching frequency over the
line, load, and output voltage range. The RT6215Aoperates
in automatic PSM that maintains high efficiency during
light load operation. The RT6215B operates in Forced
PWM that helps meet tight voltage regulation accuracy
requirements.
Low Quiescent Current (170μA typ.)
Both HS/LS FETs Protection for Robust Over-Current
Protection
Optional for Operation Modes :
Power Saving Mode (PSM) at Light Load (RT6215A)
Forced PWM Mode (RT6215B)
The RT6215A/B senses both FETs current for a robust
over-current protection. It features cycle-by-cycle current
limit protection and prevent the device from the catastrophic
damage in output short circuit, over current or inductor
saturation. An externally adjustable soft-start function
prevents inrush current during start-up. The device also
includes input under-voltage lockout, output under-voltage
protection, and over-temperature protection (thermal
shutdown) to provide safe and smooth operation in all
operating conditions. The RT6215A/B is offered in a TSOT-
23-8(FC) package.
Light-load VOUT Ripple Reduction Technology in
PSM
Fixed Switching Frequency : 500kHz
Externally Adjustable Soft-Start
Monotonic Start-Up for Pre-Biased Output
Input Under-Voltage Lockout (UVLO)
Output Under-Voltage Protection (UVP) with Hiccup
Mode
Power Good Indication
Enable Control
Available In TSOT-23-8 (FC) Package
Simplified Application Circuit
RT6215A/B
R3
V
BOOT
IN
VIN
EN
C
BOOT
L
C
IN
Enable
SW
V
OUT
R
PGOOD
C
OUT
C
FF
R1
R2
V
PGOOD
SS
PGOOD
FB
C
SS
GND
Copyright 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6215A/B-00 December 2017
www.richtek.com
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