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Giải thích chi tiết về linh kiện  LM46001-Q1 SIMPLE SWITCHER짰 3.5 V to 60 V 1 A Synchronous Step-Down Voltage Converter
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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
LM46001-Q1
www.ti.com
SNVSAA3A – JULY 2015 – REVISED AUGUST 2015
6 Pin Configuration and Functions
16-Pin HTSSOP (PWP)
Top View
Pin Functions
PIN
DESCRIPTION
NAME
NUMBER
I/O (1)
Switching output of the regulator. Internally connected to both power MOSFETs. Connect to
SW
1,2
P
power inductor.
Boot-strap capacitor connection for high-side driver. Connect a high quality 470 nF capacitor from
CBOOT
3
P
CBOOT to SW.
Internal bias supply output for bypassing. Connect bypass capacitor from this pin to AGND. Do
VCC
4
P
not connect 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
≤ VOUT ≤ 28 V, or tie to an external 3.3 V or 5 V rail if available. When used, place a bypass
BIAS
5
P
capacitor (1 to 10 µF) from this pin to ground. Tie to ground if not used (VOUT < 3.3 V). Do not
float.
Clock input to synchronize switching action to an external clock. Use proper high speed
SYNC
6
A
termination to prevent ringing. Connect to ground if not used. Do not float.
Connect a resistor RT from this pin to AGND to program switching frequency. Leave floating for
RT
7
A
500 kHz 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
PGOOD
8
A
other DC voltage no higher than 12 V.
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT. Do not short
FB
9
A
this pin to ground during operation.
Analog ground pin. Ground reference for internal references and logic. Connect to system
AGND
10
G
ground.
Soft-start control pin. Leave floating for internal soft-start. Connect to a capacitor to extend soft
SS/TRK
11
A
start time. Connect to external voltage ramp for tracking.
Enable input to the LM46001-Q1: High = ON and LOW = OFF. Connect to VIN, or to VIN through
EN
12
A
resistor 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,
PGND
15,16
G
PAD, 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
PAD
-
G
the die. Must be used for heat sinking to ground plane on PCB.
(1)
P = Power, G = Ground, A = Analog
Copyright © 2015, Texas Instruments Incorporated
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LM46001QPWPTQ1 TI1-LM46001QPWPTQ1 Datasheet
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[Old version datasheet]   3.5-V to 60-V, 1 A Synchronous Step-Down Voltage Converter
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