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LM46002PWP bảng dữ liệu(PDF) 3 Page - Texas Instruments

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tên linh kiện LM46002PWP
Giải thích chi tiết về linh kiện  SIMPLE SWITCHER 3.5 V to 60 V 2 A Synchronous Step-Down Voltage Converter
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LM46002PWP bảng dữ liệu(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
1
16
2
3
4
5
6
8
7
9
15
14
13
12
11
10
LM46002
www.ti.com
SNVSA13B – APRIL 2014 – REVISED SEPTEMBER 2014
6 Pin Configuration and Functions
16-Pin HTSSOP (PWP)
Top View
Pin Functions
PIN
TYPE (1)
DESCRIPTION
NUMB
NAME
ER
Switching output of the regulator. Internally connected to both power MOSFETs. Connect to power
SW
1,2
P
inductor.
Boot-strap capacitor connection for high-side driver. Connect a high quality 470 nF capacitor from CBOOT
CBOOT
3
P
to SW.
Internal bias supply output for bypassing. Connect bypass capacitor from this pin to AGND. Do not connect
VCC
4
P
external load to this pin. Never short this pin to ground during operation.
Optional internal LDO supply input. To improve efficiency, it is recommended to tie to VOUT when 3.3 V ≤
BIAS
5
P
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.
Clock input to synchronize switching action to an external clock. Use proper high speed termination to
SYNC
6
A
prevent ringing. Connect to ground if not used.
Connect a resistor RT from this pin to AGND to program switching frequency. Leave floating for 500 kHz
RT
7
A
default switching frequency.
Open drain output for power-good flag. Use a 10 k
Ω to 100 kΩ pull-up resistor to logic rail or other DC
PGOOD
8
A
voltage no higher than 12 V.
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT. Do not short this pin to
FB
9
A
ground during operation.
AGND
10
G
Analog ground pin. Ground reference for internal references and logic. Connect to system ground.
Soft-start control pin. Leave floating for internal soft-start slew rate. Connect to a capacitor to extend soft
SS/TRK
11
A
start time. Connect to external voltage ramp for tracking.
Enable input to the LM46002: High = ON and Low = OFF. Connect to VIN, or to VIN through resistor
EN
12
A
divider, or to an external voltage or logic source. Do not float.
Supply input pins to internal LDO and high side power FET. Connect to power supply and bypass
VIN
13,14
P
capacitors CIN. Path from VIN pin to high frequency bypass CIN and PGND must be as short as possible.
Power ground pins, connected internally to the low side power FET. Connect to system ground, PAD,
PGND
15,16
G
AGND, ground pins of CIN and COUT. Path to CIN must be as short as possible.
Low impedance connection to AGND. Connect to PGND on PCB. Major heat dissipation path of the die.
PAD
-
-
Must be used for heat sinking to ground plane on PCB.
(1)
P = Power, G = Ground, A = Analog
Copyright © 2014, Texas Instruments Incorporated
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Product Folder Links: LM46002


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