RT6158H Datasheet, PDF (3/12 Pages) Richtek Technology Corporation – High Efficiency, Low Quiescent, 3A Buck-Boost Converter

Functional Block Diagram
LX1
LX2
RT6158H
PVIN
AVIN
A
UVLO
B
OCP
Gate
DRV
D
Rd
C ^DIS
VOUT
EN
MODE
Digital
Control
DIS
PWM
Control
AMP _-
+
OSC OVP OTP
SCP
V_REF
FB
AGND
PGND
Operation
The RT6158H is a synchronous current mode constant
on/off time (CMCOT) switching Buck-Boost converter
designed to an adjustable output voltage from an input
supply that can be above, equal, or below the output
voltage. The inductor current is regulated by a fast current
regulator which is controlled by a voltage control loop.
The voltage error amplifier gets its feedback input from
the FB pin. The output voltage of the RT6158H is
adjustable, and can be set by the external divider resistor
value. When VIN is greater than VOUT, the device operates
in Buck mode. When VIN is lower than VOUT, the device
operates in Boost mode. When VIN is close to VOUT, the
RT6158H automatically enters Buck or Boost mode. In
that case, the converter will maintain the regulation for
output voltage and keep a minimum current ripple in the
inductor to guarantee good performance.
Copyright ©2017 Richtek Technology Corporation. All rights reserved.
DS6158H-00 March 2017
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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