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LM46000 bảng dữ liệu(PDF) 3 Page - Texas Instruments

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Giải thích chi tiết về linh kiện  LM46000 SIMPLE SWITCHER짰 3.5 V to 60 V 0.5 A Synchronous Step-Down Voltage Converter
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LM46000 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
(17)
1
16
2
3
4
5
6
8
7
9
15
14
13
12
11
10
LM46000
www.ti.com
SNVSA45A – JUNE 2014 – REVISED JULY 2014
5 Pin Configuration and Functions
16-Pin HTSSOP (PWP)
Top View
Pin Functions
PIN
DESCRIPTION
NAME
NUMBER
Switching output of the regulator. Internally connected to both power MOSFETs. Connect
SW
1,2
to power inductor.
Boot-strap capacitor connection for high-side driver. Connect a high quality 470 nF
CBOOT
3
capacitor from CBOOT to SW.
Internal bias supply output for bypassing. Connect bypass capacitor from this pin to
VCC
4
AGND. Do 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
BIAS
5
used, place a bypass capacitor (1 to 10 µF) from this pin to ground. Tie to ground when
not in use (VOUT < 3.3 V). Do not float.
Clock input to synchronize switching action to an external clock. Use proper high speed
SYNC
6
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
RT
7
floating for 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
PGOOD
8
or other DC voltage no higher than 12 V.
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT. Do
FB
9
not short this pin to ground during operation.
Analog ground pin. Ground reference for internal references and logic. Connect to system
AGND
10
ground.
Soft-start control pin. Leave floating for internal soft-start slew rate. Connect to a
SS/TRK
11
capacitor to extend soft start time. Connect to external voltage ramp for tracking.
Enable input to the LM46000: High = ON and low = OFF. Connect to VIN, or to VIN
EN
12
through 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
VIN
13,14
bypass 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
PGND
15,16
ground, 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
PAD
17
path of the die. Must be used for heat sinking to ground plane on PCB.
Copyright © 2014, Texas Instruments Incorporated
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Số phần tương tự - LM46000_15

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