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LM3100MH Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM3100MH
Description  SIMPLE SWITCHER짰 Synchronous 1MHz 1.5A Step-Down Voltage Regulator
PDF  15 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3100MH Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions
Pin
Name
Description
Application Information
1,9,10,12,19,20
N/C
No Connection
These pins must be left unconnected.
2, 3
SW
Switching Node
Internally connected to the buck switch source.
Connect to output inductor.
4, 5
VIN
Input supply voltage
Supply pin to the device. Nominal input range is
4.5V to 36V.
6
BST
Connection for bootstrap capacitor
Connect a 0.033µF capacitor from SW pin to this
pin. An internal diode charges the capacitor during
the high-side switch off-time.
7
GND
Analog Ground
Ground for all internal circuitry other than the
synchronous switches.
8
SS
Soft-start
An internal 8µA current source charges an external
capacitor to provide the soft- start function.
11
TST
Test mode enable pin
Force the device into test mode. Must be connected
to ground for normal operation.
13
FB
Feedback
Internally connected to the regulation and
over-voltage comparators. The regulation setting is
0.8V at this pin. Connect to feedback divider.
14
EN
Enable pin
Connect a voltage higher than 1.26V to enable the
regulator.
15
RON
On-time Control
An external resistor from VIN to this pin sets the
high-side switch on-time.
16
VCC
Start-up regulator Output
Nominally regulated to 6V. Connect a capacitor of
not less than 680nF between VCC and GND for
stable operation.
17, 18
PGND
Power Ground
Synchronous rectifier MOSFET source connection.
Tie to power ground plane.
DAP
EP
Exposed Pad
Thermal connection pad, connect to GND.
www.national.com
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