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LM20134MH Datasheet

  • LM20134MH

  • National Semiconductor [4A, PowerWise㈢ Synchronous Buck Re...

  • NSC

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LM20134
Connection Diagram
30030402
Top View
eTSSOP-16 Package
Ordering Information
Order Number
LM20134MH
LM20134MHE
LM20134MHX
Package Type
eTSSOP-16
NSC Package Drawing
MXA16A
Package Marking
20134MH
Supplied As
92 Units of Rail
250 Units of Tape and Reel
2500 Units of Tape and Reel
Pin Descriptions
Pin #
1
Name
SS/TRK
Description
Soft-Start or Tracking control input. An internal 5 碌A(chǔ) current source charges an external capacitor to
set the Soft-Start ramp rate. If driven by a external source less tan 800 mV, this pin overrides the
internal reference that sets the output voltage. If left open, an internal 1ms Soft-Start ramp is activated.
Feedback input to the error amplifier from the regulated output. This pin is connected to the inverting
input of the internal transconductance error amplifier. An 800 mV reference connected to the non-
inverting input of the error amplifier sets the closed loop regulation voltage at the FB pin.
Power good output signal. Open drain output indicating the output voltage is regulating within
tolerance. A pull-up resistor of 10 to 100 k鈩?is recommend for most applications.
External compensation pin. Connect a resistor and capacitor to this pin to compensate the device.
These pins must be connected to GND to ensure proper operation.
Input voltage to the power switches inside the device. These pins should be connected together at the
device. A low ESR capacitor should be placed near these pins to stabilize the input voltage.
Switch pin. The PWM output of the internal power switches.
Power ground pin for the internal power switches.
Precision enable input for the device. An external voltage divider can be used to set the device turn-
on threshold. If not used the EN pin should be connected to PVIN.
Internal 2.7V sub-regulator. This pin should be bypassed with a 1 碌F ceramic capacitor.
Analog input supply that generates the internal bias. Must be connected to VIN through a low pass
RC filter.
Quiet analog ground for the internal bias circuitry.
Frequency synchronization pin. An external clock connected to this pin will set the switching frequency.
If left open the device will operate at approximately 410 kHz.
Exposed metal pad on the underside of the package with a weak electrical connection to ground. It is
recommended to connect this pad to the PC board ground plane in order to improve heat dissipation.
2
FB
3
4
5
6,7
8,9
10,11
12
13
14
15
16
EP
PGOOD
COMP
NC
PVIN
SW
PGND
EN
VCC
AVIN
AGND
SYNC
Exposed Pad
www.national.com
2

LM20134MH 產(chǎn)品屬性

  • 5.5V

  • 1

  • 5V

  • 4A

  • TSSOP

  • 16

  • -40°C 到 +125°C

  • No SVHC (19-Dec-2011)

  • TSSOP

  • 4A

  • Synchronous Buck

  • 5.5V

  • 2.95V

  • 表面安裝

  • 5.5V

  • 0.8V

  • 5V

  • 5V

  • 4A

  • 1.5MHz

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