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LM3150 데이터시트(PDF) 3 Page - Texas Instruments

부품명 LM3150
상세설명  LM3150 Wide-VIN Synchronous Buck Controller
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

LM3150 데이터시트(HTML) 3 Page - Texas Instruments

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1
2
3
4
11
12
13
14
HG
VCC
5
6
7
SGND
PGND
8
9
SS
RON
LG
EN
10
SW
FB
SGND
ILIM
BST
VIN
EP
LM3150
www.ti.com
SNVS561F – SEPTEMBER 2008 – REVISED DECEMBER 2014
6 Pin Configuration and Functions
HTSSOP PWP
14 PINS
Top View
Pin Functions
PIN
I/O
DESCRIPTION
FUNCTION
NAME
NO.
Supply Voltage for FET
Nominally regulated to 5.95 V. Connect a 1.0-µF to 4.7-µF decoupling
VCC
1
O
Drivers
capacitor from this pin to ground.
VIN
2
I
Input Supply Voltage
Supply pin to the device. Nominal input range is 6 V to 42 V.
To enable the IC, apply a logic high signal to this pin greater than 1.26-V
EN
3
I
Enable
typical or leave floating. To disable the part, ground the EN pin.
Internally connected to the regulation, overvoltage, and short-circuit
FB
4
I
Feedback
comparators. The regulation setting is 0.6 V at this pin. Connect to feedback
resistor divider between the output and ground to set the output voltage.
Ground for all internal bias and reference circuitry. Should be connected to
SGND
5,9
Signal Ground
PGND at a single point.
An internal 7.7-µA current source charges an external capacitor to provide the
SS
6
I
Soft-Start
soft-start function.
RON
7
I
On-time Control
An external resistor from VIN to this pin sets the high-side switch on-time.
Monitors current through the low-side switch and triggers current limit
ILIM
8
I
Current Limit
operation if the inductor valley current exceeds a user defined value that is set
by RLIM and the Sense current, ILIM-TH, sourced out of this pin during operation.
Switch pin of controller and high-gate driver lower supply rail. A boost
SW
10
O
Switch Node
capacitor is also connected between this pin and BST pin
Gate drive signal to the high-side NMOS switch. The high-side gate driver
HG
11
O
High-Side Gate Drive
voltage is supplied by the differential voltage between the BST pin and SW
pin.
High-gate driver upper supply rail. Connect a 0.33 to 0.47-µF capacitor from
Connection for Bootstrap
BST
12
I
SW pin to this pin. An internal diode charges the capacitor during the high-side
Capacitor
switch off-time. Do not connect to an external supply rail.
Gate drive signal to the low-side NMOS switch. The low-side gate driver
LG
13
O
Low-Side Gate Drive
voltage is supplied by VCC.
Synchronous rectifier MOSFET source connection. Tie to power ground plane.
PGND
14
G
Power Ground
Should be tied to SGND at a single point.
Exposed die attach pad should be connected directly to SGND. Also used to
EP
Exposed Pad
help dissipate heat out of the IC.
Copyright © 2008–2014, Texas Instruments Incorporated
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