lm25011myx National Semiconductor Corporation, lm25011myx Datasheet - Page 2

• Manufacturer Part Number: lm25011myx
• Description: 42v, 2a Constant On-time Switching Regulator With Adjustable Current Limit
• Manufacturer: National Semiconductor Corporation

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Pin No.
Connection Diagram
Ordering Information
Pin Descriptions
10
1
2
3
4
5
6
7
8
9
Order Number
LM25011MYX
LM25011MY
SGND
Name
PGD
CSG
BST
VIN
SW
CS
RT
SS
FB
Bootstrap capacitor connection of the
buck switch gate driver.
Current Sense Ground
Input supply voltage
On-time Control
Switching Node
Signal Ground
Current sense
Package Type
Description
Power Good
MSOP-10EP
MSOP-10EP
Feedback
Soft-Start
10 Lead MSOP-EP
NSC Package Drawing
Application Information
Operating input range is 6V to 42V. Transient capability is 45V. A low ESR
capacitor must be placed as close as possible to the VIN and SGND pins.
An external resistor from VIN to this pin sets the buck switch on-time, and
the switching frequency.
Logic output indicates when the voltage at the FB pin has increased to
above 95% of the internal reference voltage. Hysteresis is provided. An
external pull-up resistor to a voltage less than 7V is required.
An internal current source charges an external capacitor to provide the soft-
start function.
Ground for all internal circuitry other than the current limit sense circuit.
Internally connected to the regulation comparator. The regulation level is
2.51V.
Ground connection for the current limit sensing circuit. Connect to ground
and to the current sense resistor.
Connect to the current sense resistor and the anode of the free-wheeling
diode.
Internally connected to the buck switch source. Connect to the external
inductor, cathode of the free-wheeling diode, and bootstrap capacitor.
Connect a 0.1 µF capacitor from SW to this pin. The capacitor is charged
during the buck switch off-time via an internal diode.
Top View
MUC10A
MUC10A
2
30094602
1000 Units on Tape and Reel
3500 Units on Tape and Reel
Supplied As