LM20134, LM20134Q
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SNVS527G –OCTOBER 2007–REVISED MARCH 2013
LM20134/LM20134Q 4A, PowerWise® Synchronous Buck Regulator with Input
Synchronization
Check for Samples: LM20134, LM20134Q
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FEATURES
DESCRIPTION
The LM20134 is a full featured synchronous buck
regulator capable of delivering up to 4A of continuous
output current. The current mode control loop can be
compensated to be stable with virtually any type of
output capacitor. For most cases, compensating the
device only requires two external components,
providing maximum flexibility and ease of use. The
device is optimized to work over the input voltage
range of 2.95V to 5.5V making it suited for a wide
variety of low voltage systems.
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LM20134Q is AEC-Q100 Qualified and
Manufactured on an Automotive Grade Flow
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Input Voltage Range 2.95V to 5.5V
Accurate Current Limit Minimizes Inductor
Size
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97% Peak Efficiency
Frequency Synchronization Pin
32 mΩ Integrated FET Switches
Starts up into Pre-Biased Loads
Output Voltage Tracking
The device features internal over voltage protection
(OVP) and over current protection (OCP) circuits for
increased system reliability. A precision enable pin
and integrated UVLO allows the turn on of the device
to be tightly controlled and sequenced. Start-up
inrush currents are limited by both an internally fixed
and externally adjustable Soft-Start circuit. Fault
detection and supply sequencing is possible with the
integrated power good circuit.
Peak Current Mode Control
Adjustable Output Voltage Down to 0.8V
Adjustable Soft-Start with External Capacitor
Precision Enable Pin with Hysteresis
Integrated OVP, UVLO, Power Good and
Thermal Shutdown
The switching frequency of the LM20134 can be
synchronized to an external clock by use of the
SYNC pin. The SYNC pin is capable of synchronizing
to input signals ranging from 500 kHz to 1.5 MHz
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HTSSOP 16-Pin Exposed Pad Package
APPLICATIONS
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Simple to Design, High Efficiency Point of
Load Regulation from a 5V or 3.3V Bus
The LM20134 is designed to work well in multi-rail
power supply architectures. The output voltage of the
device can be configured to track a higher voltage rail
using the SS/TRK pin. If the output of the LM20134 is
pre-biased at startup it will not sink current to pull the
output low until the internal soft-start ramp exceeds
the voltage at the feedback pin.
High Performance DSPs, FPGAs, ASICs and
Microprocessors
Broadband, Networking and Optical
Communications Infrastructure
Typical Application Circuit
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LM20134
V
OUT
SW
FB
V
IN
PVIN
R
R
FB1
EN
C
IN
R
F
C
OUT
AVIN
FB2
PGOOD
VCC
SYNC
COMP
C
F
C
VCC
SS/TRK
AGND
R
C1
PGND
C
SS
C
C1
(optional)
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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