RT6214A/B
18V Input, 3A, ACOTTM Buck Converter in 6 and 8 Pin
TSOT-23 with Both FETs OC Protection
General Description
Features
Input Supply Voltage Range : 4.5V to 18V
3A Converter with Built-In 100m/50m Low
RDS(ON) Power FETs
Advanced Constant On-Time (ACOTTM) Control
for Ultrafast Transient Response
Fixed Switching Frequency : 500kHz (SOT23-6)
or 650kHz (SOT23-8)
The RT6214A/B is
a
simple, easy-to-use, 3A
synchronous step-down DC-DC converter with an input
supply voltage range of 4.5V to 18V. The device
integrates low RDS(ON) power MOSFETs to achieve
high efficiency in a SOT-23 package and build-in
accurate reference voltage (0.765V or 0.8V by product
options).
Optional for Operation Modes :
The RT6214A/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 RT6214A
operates in automatic PSM that maintains high
efficiency during light load operation. RT6214B
operates in Forced PWM that helps meet tight voltage
regulation accuracy requirements.
Automatically Power Saving Mode (PSM)
(RT6214A)
Forced PWM Mode (RT6214B)
Optimized for Low-ESR Ceramic Output
Capacitors
1.5% High-Accuracy Feedback Reference
Voltage
Output Voltage Range : up to 6.5V
Internal fixed Soft-Start (typ. 1ms) for SOT-23-6
Externally Adjustable Soft-Start for SOT-23-8
Monotonic Start-Up for Pre-biased Outputs
Both HS/LS FETs Protection for Robust Over
Current Protection
The RT6214A/B senses both FETs current for a robust
over-current
protection. The
device features
cycle-by-cycle current limit protection and prevent the
device from the catastrophic damage in output short
circuit, over current or inductor saturation. The
RT6214A/B SOT-23-6 series built-in soft-start function
prevents inrush current during start-up and the
SOT-23-8 series offers programmable start-up by
connecting a capacitor at external SS pin. 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
RT6214A/B are offered in TSOT-23-6 (FC) and
TSOT-23-8 (FC) package.
Input Under-Voltage Lockout (UVLO)
Output Under-Voltage Protection (UVP) with
Hiccup Mode
Over-Temperature Protection (OTP) (Thermal
Shutdown)
Enable Control
Power Good Indication for SOT-23-8
RoHS Compliant and Halogen Free
Available in TSOT-23-6 or TSOT-23-8 Package
Copyright © 2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6214A/B-09 August 2018
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
