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LM20134MHE/NOPB-LM20134MHX/NOPB
4A, PowerWise Synchronous Buck Regulator with Input Synchronization
PVIN SW
AGND
PGOOD
SS/TRK
AVIN
COMP
LM20134VCC
PGND
RC1
CC1
CSS
COUT
VOUT
RFB2
RFB1
(optional)
SYNC
• 97% Peak Efficiency deviceis optimizedto work over the input voltage
• Frequency Synchronization Pin rangeof 2.95Vto 5.5V makingit suited fora wide
32 mΩ Integrated FET Switches varietyof low voltage systems.
Starts up into Pre-Biased Loads The device features internal
(OVP) and over current for
• Output Voltage Trackingincreased system reliability. pin
• Peak Current Mode Control and integrated UVLO allows device
• Adjustable Output Voltage Downto 0.8V to be tightly controlled Start-up
Adjustable Soft-Start with External Capacitor inrush currents are limited fixed
and externally adjustable Fault
• Precision Enable Pin with Hysteresis detection and supply sequencing with the
• Integrated OVP, UVLO, Power Good and integrated power good circuit.
Thermal Shutdown The switching frequency of the LM20134 can be
• HTSSOP 16-Pin Exposed Pad Package synchronized to an external clock by use of the
SYNC pin. The SYNC pinis capableof synchronizing
APPLICATIONS to input signals ranging from 500 kHzto 1.5 MHz
Simpleto Design, High Efficiency Pointof The LM20134is designedto work wellin multi-rail
Load Regulation froma 5Vor 3.3V Bus power supply architectures. The output voltageof the
High Performance DSPs, FPGAs, ASICs and device canbe configuredto tracka higher voltage rail
using the SS/TRK pin.If the outputof the LM20134is
Microprocessorspre-biasedat startupit will not sink currentto pull the
• Broadband, Networking and Optical output low until the internal soft-start ramp exceeds the voltageat the feedback pin.
Typical Application Circuit
