LM5009EVAL National Semiconductor, LM5009EVAL Datasheet - Page 3

• Manufacturer Part Number: LM5009EVAL
• Description: BOARD EVALUATION LM5009
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM5009EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 10V
• Current - Output: 150mA
• Voltage - Input: 12 ~ 95V
• Regulator Topology: Buck
• Frequency - Switching: 240Hz
• Board Type: Fully Populated
• Utilized Ic / Part: LM5009
• Lead Free Status / RoHS Status: Not applicable / Not applicable
• Power - Output: -
• Lead Free Status / Rohs Status: Not Compliant

Pin Descriptions
Pin
1
2
3
4
5
6
7
8
RON/SD
Name
VCC
BST
RCL
RTN
VIN
SW
FB
EP
Switching output
Boost Pin
Current Limit off-time set pin
Ground pin
Feedback input from Regulated Output
On-time set pin
Output from the internal high voltage startup
regulator. Regulated at 7.0V.
Input voltage
Exposed Pad (LLP Package only)
Description
3
Power switching output. Connect to the inductor, re-
circulating diode, and bootstrap capacitor.
An external capacitor is required between the BST
and the SW pins. A 0.022 µF ceramic capacitor is
recommended. An internal diode charges the
capacitor from V
A resistor between this pin and RTN sets the off-time
when current limit is detected. The off-time is preset
to 35µs if FB = 0V.
Ground for the entire circuit.
This pin is connected to the inverting input of the
internal regulation comparator. The regulation
threshold is 2.5V.
A resistor between this pin and VIN sets the switch on-
time as a function of V
on-time is 250ns at the maximum input voltage. This
pin can be used for remote shutdown.
If an auxiliary voltage is available to raise the voltage
on this pin above the regulation setpoint (7V), the
internal series pass regulator will shutdown, reducing
the IC power dissipation. Do not exceed 14V. This
voltage provides gate drive power for the internal Buck
switch. An internal diode is provided between this pin
and the BST pin. A local 0.1µF decoupling capacitor
is required.
Recommended operating range: 9.5V to 95V.
Exposed metal pad on the underside of the device. It
is recommended to connect this to the PC board
ground plane to aid in heat dissipation.
Application Information
CC
.
IN
. The minimum recommended
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