LM5008EVAL National Semiconductor, LM5008EVAL Datasheet - Page 3

• Manufacturer Part Number: LM5008EVAL
• Description: EVALUATION BOARD FOR LM5008
• Manufacturer: National Semiconductor

Specifications of LM5008EVAL

• Main Purpose: DC/DC, Step Down
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 10V
• Current - Output: 300mA
• Voltage - Input: 12 ~ 95V
• Regulator Topology: Buck
• Board Type: Fully Populated
• Utilized Ic / Part: LM5008
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -
• Frequency - Switching: -
• Other names: *LM5008EVAL

Pin Descriptions
Pin
1
2
3
4
5
6
7
8
R
Name
BST
RTN
ON
V
SW
R
V
FB
EP
CC
CL
IN
/SD
Switching Node
Boost Pin (Boot–strap capacitor input)
Current Limit OFF time set pin
Toff = 10
Ground pin
Feedback input from Regulated Output
On time set pin
Ton = 1.25 x 10
Output from the internal high voltage series pass
regulator. Regulated at 7.0V.
Input voltage
Exposed Pad
-5
/ (0.285 + (FB / 6.35 x 10
-10
R
Description
ON
/ V
IN
− 6
x R
3
CL
))
Power switching node. Connect to the output inductor,
re-circulating diode, and bootstrap capacitor.
An external capacitor is required between the BST
and the SW pins. A 0.01µF 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 V
time as a function of V
on time is 400ns 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 recommended. Series pass regulator is current
limited to 10mA.
Recommended operating range: 9.5V to 95V.
The exposed pad has no electrical contact. Connect
to system ground plane for reduced thermal
resistance.
Application Information
CC
.
IN
. The minimum recommended
IN
sets the switch on
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