PD‐97745
12A Highly Integrated SupIRBuck
Single‐Input Voltage, Synchronous Buck Regulator
- 1 -`
IR3894
FEATURES
Single 5V to 21V application
Wide Input Voltage Range from 1.0V to 21V with
external Vcc
Output Voltage Range: 0.5V to 0.86* Vin
Enhanced Line/Load Regulation with Feed‐Forward
Programmable Switching Frequency up to 1.5MHz
Internal Digital Soft‐Start/Soft‐Stop
Enable input with Voltage Monitoring Capability
Thermally Compensated Current Limit with robust
hiccup mode over current protection
Smart internal LDO to improve light load and full load
efficiency
External Synchronization with Smooth Clocking
Enhanced Pre‐Bias Start‐Up
Precision Reference Voltage (0.5V+/‐0.5%) with
margining capability
Vp for Tracking Applications ((Source/Sink Capability
+/‐12A)
Integrated MOSFET drivers and Bootstrap Diode
Thermal Shut Down
Programmable Power Good Output with tracking
capability
Monotonic Start‐Up
Operating temp: ‐40
o
C < Tj < 125
o
C
Small Size: 5mm x 6mm PQFN
Lead‐free, Halogen‐free and RoHS Compliant
The IR3894 SupIRBuck
TM
is an easy‐to‐use, fully
integrated and highly efficient DC/DC regulator.
The onboard PWM controller and MOSFETs make
IR3894 a space‐efficient solution, providing accurate
power delivery.
IR3894 is a versatile regulator which offers
programmable switching frequency and the fixed
internal current limit
The switching frequency is programmable from 300 kHz
to 1.5MHz for an optimum solution.
It also features important protection functions, such as
Pre‐Bias startup, thermally compensated current limit
over voltage protection and thermal shutdown to give
required system level security in the event of fault
conditions.
DESCRIPTION
APPLICATIONS
Netcom Applications
Embedded Telecom Systems
Server Applications
Storage Applications
Distributed Point of Load Power Architectures
BASIC APPLICATION
Figure 1: IR3894 Basic Application Circuit
1
JANUARY 18, 2013 | DATA SHEET |
Rev 3.4
Figure 2: IR3894 Efficiency
IRF [ INTERNATIONAL RECTIFIER ]
