RT6158A
Functional Block Diagram
LX1
LX2
A
D
VOUT
PVIN
Power
MOS
Gate
Rd
UVLO
AVIN
DIS
Driver
C
B
OCP
EN
PWM
Control
Digital
Control
DIS
MODE
AMP
-
+
FB
AGND
V
REF
OSC
OVP
OTP
SCP
PGND
Operation
adjustable, and can be set by the external divided resistor.
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 VINis close to VOUT, the
RT6158A 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.
The RT6158A is a synchronous current mode constant
on/off time (CMCOT) switching Buck-Boost converter
designed to an adjustable output voltage with an input
supply that can be above, equal, or under 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 RT6158A is
Copyright 2019 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6158A-05 August 2019
www.richtek.com
3
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
