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LPR30DSTN/a230avaiLOW DROP VOLTAGE REGULATOR DRIVE FOR EXTERNAL N-CHANNEL POWER MOSFET


LPR30D ,LOW DROP VOLTAGE REGULATOR DRIVE FOR EXTERNAL N-CHANNEL POWER MOSFETBLOCK DIAGRAM1/10May 2000 LPR30external Power MOSFET multiplied by the output It has an internal hi ..
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LPR30D
LOW DROP VOLTAGE REGULATOR DRIVE FOR EXTERNAL N-CHANNEL POWER MOSFET
LPR30
LOW DROP VOLTAGE REGULATOR DRIVE
FOR EXTERNAL N-CHANNEL POWER MOSFET
May 2000 VERY LOW DROPOUT POWER MOSFET
DRIVER HIGH PRECISION Vref = 2.5V (± 2%) VERY LOW CURRENT DRAIN (TYP. 2mA) REFERENCE OUTPUT CURRENT UP TO
20mA OPERATING SUPPLY VOLTAGE FROM 5V
TO 30V MAXIMUM INPUT VOLTAGE ON-GATE PIN
(N. 8) UP TO 60V INTERNAL CURRENT LIMIT OPERATIONAL
AMPLIFIER OFFSET TRIMMED AT
50mV ± 10mV NO CAPACITOR IS NEEDED FOR STABILITY
OF REFERENCE OUTPUT TEMPERATURE RANGE 0 o C TO 70 oC
APPLICATION
ULTRA HIGH CURRENT ULTRA LOW
DROPOUT VOLTAGE REGULATOR CONSTANT HIGH CURRENT SOURCE
BLOCK DIAGRAM
LOW PARTS COUNT 5V TO 3.3V
COMPUTER SUPPLY LOW NOISE/LOW DROP SMPS POST
REGULATOR
DESCRIPTION

The LPR30 is a very Low Dropout Regulator
Controller in a single IC solution for very high
current low dropout linear voltgage regulator. It
uses an external N-CHANNEL POWER MOSFET
as the linear pass element. The LPR30 features a
dropout voltage as low as the RDS(on) of the
1/10
external Power MOSFET multiplied by the output
current. Consequently the output current can be
as high as the POWER MOSFET can provide
(also using an adeguate heatsink).
The VCC of the LPR30 range from 5V to 30V. For
very low drop voltage operation,the LPR30
requires an external gate drive supply to provide
the control voltage needed to drive the gate of the
external POWER MOSFET.
The regulator output is constant-current limited
when the controller detects 50mV across an
external sense resistor.
It has an internal high precision (± 2%) Voltage
Reference at 2.5V
The output regulated voltage is possible to
program to any voltage from 1V to more than
50V.
Flexible design is achieved by the availability of
the Voltage Reference Output through an
external pin (N.4) that is able to supply more than
20mA as load current. The LPR30 is available in
8 pin plastic DIP and in SO-8 for SMD. In both
package versions it is able to operate from 0o C tooC.
ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
THERMAL DATA

(*) This value depends from thermal design of PCB on which the device is mounted.
CONNECTION DIAGRAM (top view)
ORDERING NUMBERS
LPR30

2/10
ELECTRICAL CHARACTERISTICS
(Refer to the test circuits, VCC = 10V, Tj = 25 o C unless otherwise specified.
GENERAL
REFERENCE BLOCK
ERROR AMPLIFIER BLOCK
CURRENT LIMITING BLOCK
LPR30

3/10
TEST CIRCUIT
Reference Output Voltage vs Temperature Reference Output Voltage vs Load Current
TYPICAL PERFORMANCE CHARACTERISTICS
LPR30

4/10
Reference Output Voltage vs Load Current
Current Limit Input Offset Voltage vs Supply
Voltage
Reference Supply Voltage Rejection vs Output
Current
Error Amplifier Output Saturation Voltage vs
Temperature
Current Limit Input Offset Voltage vs Supply
Voltage
Reference Output Noise vs Output Current
LPR30

5/10
APPLICATION INFORMATION
Figure 1: LPR30 Typical Application
Figure 2: Configuration For Faster Response
Figure 3: Configuration For VIN = 3.3V, VOUT = 2.9V, IOUT = 7A

(*) This capacitor improves noise performance; can be omitted in most applications
LPR30

6/10
ic,good price


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