RT2875A Datasheet, PDF (1/16 Pages) Richtek Technology Corporation – Synchronous Step-Down Converter

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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.
Pin Configurations
(TOP VIEW)
SW
SW
PGND
RT/SYNC
AGND
RLIM
FB
14
2
13
3
12
4 _PGND 11
5
10
6
15 ⁹
7
8
BOOT
VIN
VIN
PGOOD
EN
SS
COMP
TSSOP-14 (Exposed Pad)
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
Applications
 Point of Load Regulator in Distributed Power Systems
 Digital Set Top Boxes
 Broadband Communications
 Vehicle Electronics
Simplified Application Circuit
V_IN
C_IN
Enable
PGOOD
R_{LIM ROSC}
VIN
BOOT
RT2875A/B
SW
EN
PGOOD
FB
RLIM
RT/SYNC COMP
SS
AGND PGND
C_{BOOT L}
R_COMP ^CCOMP
C_SS
V_OUT
R1
C_OUT
R2
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS2875A/B-05 October 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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