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LM34919C-Q1 Datenblatt(PDF) 6 Page - Texas Instruments

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Teilenummer LM34919C-Q1
Bauteilbeschribung  LM34919C-Q1 Ultra Small 50V, 600 mA Constant On-Time Buck Switching Regulator
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
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LM34919C-Q1 Datenblatt(HTML) 6 Page - Texas Instruments

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LM34919C-Q1
SNVS831A – SEPTEMBER 2013 – REVISED DECEMBER 2013
www.ti.com
Pin Descriptions (continued)
PIN
PIN NUMBER
NAME
DESCRIPTION
APPLICATION INFORMATION
NUMBER
(WSON-12)
B2
9
PGD
Power Good
Open drain. Logic output indicates when the voltage
at the FB pin has increased above 92% of the
internal reference. The falling threshold for PGD is
90% of the internal reference. An external pull-up
resistor connecting PGD pin to a voltage less than
14 V is required.
B3
8
SS
Soft-start
An internal current source charges an external
capacitor to 2.52 V, providing the soft-start function.
C1
2
ISEN
Current sense
The re-circulating current flows through the internal
sense resistor and out of this pin to the free-
wheeling diode. Valley current limit is nominally set
at 0.64 A.
C2
3
EN
Enable Pin
Pull low to disable the part for low shutdown current.
Shutdown threshold is 1.3 V (typ).
C3
10
VCC
Output from the startup regulator
Nominally regulated at 7.0 V. An external voltage (7
V - 14 V) can be applied to this pin to reduce
internal dissipation. An internal diode connects VCC
to VIN.
D1
1
VIN
Input supply voltage
Nominal input range is 4.5 V to 50 V.
D2
12
SW
Switching Node
Internally connected to the buck switch source.
Connects to the inductor, free-wheeling diode, and
bootstrap capacitor.
D3
11
BST
Boost pin for bootstrap capacitor
Connect a 0.022 µF capacitor from SW to this pin.
The capacitor is charged from VCC via an internal
diode during each off-time.
EP (WSON Only)
Exposed pad should be connected to RTN pin and
system ground for proper cooling.
6
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