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LM34930TL/NOPB Datasheet(PDF) 2 Page - Texas Instruments

Part # LM34930TL/NOPB
Description  1A Constant On-Time Buck Switching Regulator with Intelligent Current
PDF  24 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM34930TL/NOPB Datasheet(HTML) 2 Page - Texas Instruments

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VCC
D 1
SW
SW
VIN
VIN
BST
ISEN
RT
SS
D3
D2
C3
C2
C1
A3
A2
A1
B1
B2
B3
SGND
nOV
FB
A3
A2
A1
B3
B2
B1
D3
D2
D1
C3
C2
C1
LM34930
SNVS571B – MAY 2008 – REVISED APRIL 2013
www.ti.com
Connection Diagram
Figure 1. Bump Side
Figure 2. Top View
PIN DESCRIPTIONS
Pin No.
Name
Description
Application Information
A1
GND
Ground
Ground for all internal circuitry
A2
nOV
Input over-voltage indicator
Open drain output switches low when Vin exceeds the over-voltage
indicator threshold
A3
FB
Output voltage feedback
Internally connected to the regulation comparator. The regulation level is
2.52V.
B1
ISEN
Current sense
The re-circulating current flows out of this pin to the free-wheeling diode.
B2
RT
On-time control
An external resistor from VIN to this pin sets the buck switch on-time,
and the switching frequency.
B3
SS
Soft-Start
An internal current source charges an external capacitor to provide the
soft-start function.
C1, C2
VIN
Input supply voltage
Operating input range is 8V to 33V, with over-voltage shutdown
internally set at 36V. Absolute maximum transient capability is 44V.
C3
VCC
Output of the internal bias regulator
Nominally regulated at 7V.
D1, D2
SW
Switching node
Internally connected to the buck switch source. Connect to the external
inductor, free wheeling diode, and bootstrap capacitor.
D3
BST
Bootstrap capacitor connection of the
Connect a 0.022 µF capacitor from SW to this pin. The capacitor is
buckswitch gate driver
charged during the buck switch off-time via an internal diode.
2
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM34930



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