®
RT2875A/B
3A, 36V, Synchronous Step-Down Converter
General Description
The RT2875A/B is a high efficiency, current-mode
synchronous DC-DC step-down converter that can deliver
up to 3A output current over a wide input voltage range
from 4.5V to 36V. The device integrates 95mΩ high-side
and 70mΩ low-side MOSFETs to achieve high conversion
efficiency. The current-mode control architecture supports
fast transient response and simple external compensation.
A cycle-by-cycle current limit function provides protection
against shorted output and an external soft-start eliminates
input current surge during start-up. The RT2875A/B
provides complete protection functions such as input under-
voltage lockout, output under-voltage protection, over-
current protection and thermal shutdown.
The RT2875A/B is available in the thermal enhanced
TSSOP-14 (Exposed Pad) package.
Features
3A Output Current
Internal N-MOSFETs
Current Mode Control
Adjustable Switching Frequency : 300kHz to 2.1MHz
Adjustable Current Limit : 1.5A to 6A
Synchronous to External Clock : 300kHz to 2.1MHz
Adjustable Output Voltage from 0.6V to 24V
High Efficiency Up to 95%
Stable with Low ESR Ceramic Output Capacitors
Cycle-by-Cycle Current Limit
Input Under-Voltage Lockout
Output Under-Voltage Protection
Thermal Shutdown
AEC-Q100 Grade 2 Certification
RoHS Compliant and Halogen Free
Pin Configuration
(TOP VIEW)
SW
SW
PGND
RT/SYNC
AGND
RLIM
FB
14
2
3
4
5
6
7
15
13
12
Applications
PGND
11
10
9
8
BOOT
VIN
VIN
PGOOD
EN
SS
COMP
Point of Load Regulator in Distributed Power Systems
Digital Set Top Boxes
Broadband Communications
Vehicle Electronics
TSSOP-14 (Exposed Pad)
Simplified Application Circuit
V
IN
C
IN
Enable
PGOOD
VIN
BOOT
C
BOOT
L
SW
EN
PGOOD
RLIM
RT/SYNC
R
LIM
R
OSC
AGND
FB
R
COMP
COMP
SS
C
SS
PGND
C
COMP
R2
R1
C
OUT
V
OUT
RT2875A/B
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2875A/B-08 November 2018
www.richtek.com
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RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
