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LM43602 Datasheet(PDF) 3 Page - Texas Instruments

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No. de pieza LM43602
Descripción Electrónicos  LM43602 SIMPLE SWITCHER짰 3.5 V to 36 V 2-A Synchronous Step-Down Voltage Converter
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

LM43602 Datasheet(HTML) 3 Page - Texas Instruments

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SW
VIN
PGND
CBOOT
VCC
BIAS
SYNC
RT
PGOOD
EN
SS/TRK
AGND
FB
SW
PGND
VIN
PAD
(17)
1
16
2
3
4
5
6
8
7
9
15
14
13
12
11
10
LM43602
www.ti.com
SNVSA36A – APRIL 2014 – REVISED APRIL 2014
6 Pin Configuration and Functions
16-Pin HTSSOP (PWP)
Top View
Pin Functions
PIN
DESCRIPTION
NAME
NUMBER
SW
1,2
Switching output of the regulator. Internally connected to both power MOSFETs. Connect
to power inductor.
CBOOT
3
Boot-strap capacitor connection for high-side driver. Connect a high quality 470 nF
capacitor from CBOOT to SW.
VCC
4
Internal bias supply output for bypassing. Connect bypass capacitor from this pin to
AGND. Do not connect external loading to this pin. Never short this pin to ground during
operation.
BIAS
5
Optional internal LDO supply input. To improve efficiency, it is recommended to tie to
VOUT when 3.3 V ≤ VOUT ≤ 28 V, or tie to an external 3.3 V or 5 V rail if available. When
used, place a bypass capacitor (1 to 10 µF) from this pin to ground. Tie to ground when
not in use.
SYNC
6
Clock input to synchronize switching action to an external clock. Use proper high speed
termination to prevent ringing. Connect to ground if not used.
RT
7
Connect a resistor RT from this pin to AGND to program switching frequency. Leave
floating for 500 kHz default switching frequency.
PGOOD
8
Open drain output for power-good flag. Use a 10 k
Ω to 100 kΩ pull-up resistor to logic rail
or other DC voltage no higher than 12 V.
FB
9
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT. Do
not short this pin to ground during operation.
AGND
10
Analog ground pin. Ground reference for internal references and logic. Connect to system
ground.
SS/TRK
11
Soft-start control pin. Leave floating for internal soft-start slew rate. Connect to a
capacitor to extend soft start time. Connect to external voltage ramp for tracking.
EN
12
Enable input to the internal LDO and regulator. High = ON and low = OFF. Connect to
VIN, or to VIN through resistor divider,or to an external voltage or logic source. Do not
float.
VIN
13,14
Supply input pins to internal LDO and high side power FET. Connect to power supply and
bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and PGND must
be as short as possible.
PGND
15,16
Power ground pins, connected internally to the low side power FET. Connect to system
ground, PAD, AGND, ground pins of CIN and COUT. Path to CIN must be as short as
possible.
PAD
17
Low impedance connection to AGND. Connect to PGND on PCB. Major heat dissipation
path of the die. Must be used for heat sinking to ground plane on PCB.
Copyright © 2014, Texas Instruments Incorporated
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