LM5008MM National Semiconductor, LM5008MM Datasheet - Page 3

• Manufacturer Part Number: LM5008MM
• Description: BUCK BIAS REG, 100V, 5008, MSOP8
• Manufacturer: National Semiconductor

Specifications of LM5008MM

• Primary Input Voltage: 95V
• No. Of Outputs: 1
• Output Voltage: 90V
• Output Current: 350mA
• Voltage Regulator Case Style: MSOP
• No. Of Pins: 8
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Pin Description
PIN
1
2
3
4
5
6
7
8
R
NAME
RTN
ON
BST
V
R
SW
V
FB
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
-5
/ (0.285 + (FB / 6.35 x 10
-10
DESCRIPTION
R
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
on time as a function of V
recommended 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.
APPLICATION INFORMATION
CC
.
IN
. The minimum
IN
sets the switch
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