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Richtek - Synchronous Step-Down Converter

Numéro de référence RT2875A
Description Synchronous Step-Down Converter
Fabricant Richtek 
Logo Richtek 





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RT2875A fiche technique
®
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
78
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
VIN
Enable
PGOOD
CIN
RLIM ROSC
VIN BOOT
RT2875A/B
SW
EN
PGOOD
RLIM
FB
RT/SYNC COMP
SS
AGND PGND
CBOOT L
RCOMP CCOMP
CSS
VOUT
R1
COUT
R2
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2875A/B-04 August 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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