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LM5007MMX Datasheet(PDF) 3 Page - Texas Instruments

Part # LM5007MMX
Description  High Voltage 80-V Step Down Switching Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM5007MMX Datasheet(HTML) 3 Page - Texas Instruments

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1
2
3
4
5
6
7
8
SW
BST
RCL
FB
RTN
RON
VCC
VIN
LM5007
www.ti.com
SNVS252G – SEPTEMBER 2003 – REVISED NOVEMBER 2015
5 Pin Configuration and Functions
DGK Package and NGT Package
8-Pin VSSOP and 8-Pin WSON
Top View
Pin Functions
PIN
TYPE
DESCRIPTION
APPLICATION INFORMATION
NO.
NAME
1
SW
O
Switching Node
Power switching node. Connect to the LC output filter.
2
BST
I
Boost Boot–strap capacitor input
An external capacitor is required between the BST and
the SW pins. A 0.01-µF ceramic capacitor is
recommended. An internal diode between VCC and
BST completes the Buck gate drive bias network.
3
RCL
I
Current Limit OFF time programming pin
A resistor between this pin and RTN determines the
Toff = 10-5 / (0.59 + (FB / 7.22 x 10− 6 x RCL))
variation of off time, along with the FB pin voltage, per
cycle while in current limit. The off time is preset to 17
µS if FB =0 V and decreases as the FB pin voltage
increases.
4
RTN
Circuit Ground
5
FB
I
Feedback Signal from Regulated Output
This pin is connected to the inverting input of the
internal regulation comparator. The regulation
threshold is 2.5 V.
6
RON
I
On time set pin
A resistor between this pin and VIN sets the switch on
Ton = 1.42 x 10-10 RON / VIN
time as a function of VIN. The minimum recommended
on time is 300 ns at the maximum input voltage.
7
VCC
O
Output from the internal high voltage bias
If an auxiliary voltage is available to raise the voltage
regulator. VCC is nominally regulated to 7 V.
on this pin, above the regulation set point (7V), the
internal series pass regulator will shutdown, reducing
the IC power dissipation. Do not exceed 14V. This
output provides gate drive power for the internal Buck
switch. An internal diode is provided between this pin
and the BST pin. A local 0.1uF decoupling capacitor is
recommended. Series pass regulator is current limited
to 10mA.
8
VIN
I
Input supply voltage
Recommended operating range: 9V to 75V.
EP
Exposed PAD, underside of the WSON
Internally bonded to the die substrate. Connect to
package option
GND potential for low thermal impedance.
Copyright © 2003–2015, Texas Instruments Incorporated
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3
Product Folder Links: LM5007


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