LM34910EVAL National Semiconductor, LM34910EVAL Datasheet - Page 3

• Manufacturer Part Number: LM34910EVAL
• Description: BOARD EVALUATION LM34910
• Manufacturer: National Semiconductor

Specifications of LM34910EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 5V
• Current - Output: 1A
• Voltage - Input: 8 ~ 36V
• Regulator Topology: Buck
• Frequency - Switching: 850kHz
• Board Type: Fully Populated
• Utilized Ic / Part: LM34910
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -

Pin Description
PIN
10
1
2
3
4
5
6
7
8
9
R
NAME
S
ON
RTN
BST
I
V
SW
V
SEN
FB
SS
GND
CC
IN
/SD
Switching Node
Boost pin for boot-strap capacitor
Current sense input
Sense Ground
Circuit Ground
Feedback
Softstart
On-time Control and Shutdown
Output from the start-up regulator
Input supply voltage
DESCRIPTION
3
Internally connected to the buck switch source.
Connect to the external inductor, diode, and boost
capacitor.
Connect a 0.022 µF capacitor from SW to this pin. An
internal diode charges the capacitor during the
off-time.
Internally the current sense resistor connects from this
pin to S
to the free-wheeling diode. Current limit is set at
1.25A.
Re-circulating current flows into this pin to the current
sense resistor.
Ground for all internal circuitry other than the current
limit detection.
Internally connected to the regulation and over-voltage
comparators. The regulation level is 2.5V.
An internal 11.5 µA current source charges an external
capacitor to 2.5V to provide the softstart function.
An external resistor from V
switch on-time. Grounding this pin shuts down the
regulator.
Nominally regulated to 7.0V. An external voltage
(8V-14V) can be connected to this pin to reduce
internal dissipation. An internal diode connects V
V
Nominal input range is 8.0V to 36V.
IN
.
GND
. Re-circulating current flows out of this pin
APPLICATION INFORMATION
IN
to this pin sets the buck
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CC
to