LM46002-Q1 Datasheet, PDF (3/60 Pages) Texas Instruments – 3.5-V to 60-V, 2-A, Synchronous Step-Down Voltage Converter

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5 Pin Configuration and Functions
SW
SW
CBOOT
VCC
BIAS
SYNC
RT
PGOOD
PWP Package
16-Pin HTSSOP
Top View
1
16
2
15
3
14
4
13
5
PAD
12
6
11
7
10
8
9
LM46002-Q1, LM46002A-Q1
SNVSAA2B – JULY 2015 – REVISED JULY 2017
PGND
PGND
VIN
VIN
EN
SS/TRK
AGND
FB
PIN
NO.
NUMBER
1, 2
SW
3
CBOOT
4
VCC
5
BIAS
6
SYNC
7
RT
8
PGOOD
9
FB
10
AGND
11
SS/TRK
12
EN
13,14
VIN
15,16
-
PGND
PAD
I/O ⁽¹⁾
P
P
P
P
A
A
A
A
G
A
A
P
G
G
Pin Functions
DESCRIPTION
Switching output of the regulator. Internally connected to both power MOSFETs. Connect to power
inductor.
Boot-strap capacitor connection for high-side driver. Connect a high quality 470-nF capacitor from
CBOOT to SW.
Internal bias supply output for bypassing. Connect bypass capacitor from this pin to 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, TI recommends tying to V_OUT when 3.3 V ≤
V_OUT ≤ 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
prevent ringing. Connect to ground if not used.
Connect a resistor R_T from this pin to AGND to program switching frequency. Leave floating for 500-kHz
default switching frequency.
Open drain output for power-good flag. Use a 10-kΩ to 100-kΩ pullup resistor to logic rail or other DC
voltage no higher than 12 V.
Feedback sense input pin. Connect to the midpoint of feedback divider to set V_OUT. Do not short this pin
to ground during operation.
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 start time. Connect to external voltage ramp for tracking.
Enable input to the LM46002-Q1: 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.
Supply input pins to internal LDO and high side power FET. Connect to power supply and bypass
capacitors C_IN. Path from VIN pin to high frequency bypass C_IN and PGND must be as short as
possible.
Power ground pins, connected internally to the low side power FET. Connect to system ground, PAD,
AGND, ground pins of C_IN and C_OUT. Path to C_IN must be as short as possible.
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.
(1) P = Power, G = Ground, A = Analog
Copyright © 2015–2017, Texas Instruments Incorporated
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Product Folder Links: LM46002-Q1 LM46002A-Q1