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LM20143-Q1 Datenblatt(PDF) 3 Page - Texas Instruments

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Teilenummer LM20143-Q1
Bauteilbeschribung  3-A PowerWise Adjustable Frequency Synchronous Buck Regulator
Download  36 Pages
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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FB
PGOOD
COMP
NC
PVIN
PVIN
SW
SS/TRK
AVIN
VCC
EN
PGND
PGND
SW
AGND
RT
Exposed Pad
On Bottom
(EP)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LM20143, LM20143-Q1
www.ti.com
SNVS528H – OCTOBER 2007 – REVISED JANUARY 2016
5 Pin Configuration and Functions
PWP Package
16-Pin HTSSOP With Exposed Thermal Pad
Top View
Pin Functions
PIN
TYPE(1)
DESCRIPTION
NO.
NAME
Soft-Start or Tracking control input. An internal 5-µA current source charges an external capacitor to set
1
SS/TRK
I
the Soft-Start ramp rate. If driven by a external source less than 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
2
FB
I
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.
3
PGOOD
O
is recommend for most applications.
External compensation pin. Connect the compensation network to resistor and capacitor to this pin to
4
COMP
O
compensate the device.
This pin has no internal connection. While this pin may be left open, it is strongly recommended that this
5
NC
-
pin be connected to Ground.
6
Input voltage to the power switches inside the device. These pins should be connected together at the
PVIN
P
device. A low ESR capacitor should be placed near these pins to stabilize the input voltage.
7
8
SW
P
Switch pin. The PWM output of the internal power switches.
9
10
PGND
G
Power ground pin for the internal power switches.
11
Precision enable input for the device. An external voltage divider can be used to set the device turn-on
12
EN
I
threshold. If not used the EN pin should be connected to PVIN.
13
VCC
P
Internal 2.7-V sub-regulator. This pin should be bypassed with a 1-µF ceramic capacitor.
Analog input supply that generates the internal bias. Must be connected to VIN through a low pass RC
14
AVIN
P
filter.
15
AGND
G
Quiet analog ground for the internal bias circuitry.
16
RT
I
Frequency adjust pin. Connecting a resistor on this pin to ground will set the oscillator frequency.
Exposed metal thermal pad on the underside of the package with a weak electrical connection to
EP
Exposed Pad
-
ground. It is recommended to connect this pad to the PC board ground plane copper in order to improve
heat dissipation and reduce the package
θJA. Do not connect to any potential other than Ground.
(1)
P: Power, I: Input, O: Output, G: Ground
Copyright © 2007–2016, Texas Instruments Incorporated
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