LP3872EMPX-3.3 Integrated Circuit Chip linear integrated circuits

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LP3872/LP3875

1.5A Fast Ultra Low Dropout Linear Regulators

General Description

The LP3872/LP3875 series of fast ultra low-dropout linear regulators operate from a +2.5V to +7.0V input supply. Wide range of preset output voltage options are available. These ultra low dropout linear regulators respond very quickly to step changes in load, which makes them suitable for low voltage microprocessor applications.

The LP3872/LP3875 are developed on a CMOS process which allows low quiescent current operation independent of output load current. This CMOS process also allows the LP3872/LP3875 to operate under extremely low dropout conditions.

Dropout Voltage: Ultra low dropout voltage; typically 38mV at 150mA load current and 380mV at 1.5A load current.

Ground Pin Current: Typically 6mA at 1.5A load current

Shutdown Mode: Typically 10nA quiescent current when the shutdown pin is pulled low.

Error Flag: Error flag goes low when the output voltage drops 10% below nominal value.

SENSE: Sense pin improves regulation at remote loads

Precision Output Voltage: Multiple output voltage options are available ranging from 1.8V to 5.0V with a guaranteed accuracy of ±1.5% at room temperature, and ±3.0% over all conditions (varying line, load, and temperature).

Features

• Ultra low dropout voltage
• Low ground pin current
• Load regulation of 0.06%
• 10nA quiescent current in shutdown mode
• Guaranteed output current of 1.5A DC
• Available in TO-263, TO-220 and SOT-223 packages
• Output voltage accuracy ± 1.5%
• Error flag indicates output status
• Sense option improves load regulation
• Minimum output capacitor requirements
• Overtemperature/overcurrent protection
• −40˚C to +125˚C junction temperature range

Applications

• Microprocessor power supplies
• GTL, GTL+, BTL, and SSTL bus terminators
• Power supplies for DSPs
• SCSI terminator
• Post regulators
• High efficiency linear regulators
• Battery chargers
• Other battery powered applications

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.

Storage Temperature Range −65˚C to +150˚C

Lead Temperature (Soldering, 5 sec.) 260˚C

ESD Rating (Note 3) 2 kV

Power Dissipation (Note 2) Internally Limited

Input Supply Voltage (Survival) −0.3V to +7.5V

Shutdown Input Voltage (Survival) −0.3V to +7.5V

Output Voltage (Survival), (Note 4), (Note 5) −0.3V to +6.0V

I_OUT (Survival) Short Circuit Protected

Maximum Voltage for ERROR Pin V_IN

Maximum Voltage for SENSE Pin V_OUT

Operating Ratings

Input Supply Voltage (Note 6) 2.5V to 7.0V

Shutdown Input Voltage −0.3V to 7.0V

Maximum Operating Current (DC) 1.5A

Junction Temperature −40˚C to +125˚C

Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is intended to be functional, but does not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions.

Note 2: At elevated temperatures, devices must be derated based on package thermal resistance. The devices in TO220 package must be derated at θjA = 50˚C/W (with 0.5in2, 1oz. copper area), junction-to-ambient (with no heat sink). The devices in the TO263 surface-mount package must be derated at θjA = 60˚C/W (with 0.5in2, 1oz. copper area), junction-to-ambient. The SOT-223 package must be derated at θjA = 90˚C/W (with 0.5in2, 1oz. copper area), junction-to-ambient.

Note 3: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.

Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the output must be diode-clamped to ground.

Note 5: The output PMOS structure contains a diode between the VIN and VOUT terminals. This diode is normally reverse biased. This diode will get forward biased if the voltage at the output terminal is forced to be higher than the voltage at the input terminal. This diode can typically withstand 200mA of DC current and 1Amp of peak current.

Note 6: The minimum operating value for VIN is equal to either [VOUT(NOM) + VDROPOUT] or 2.5V, whichever is greater.

Typical Application Circuits

Connection Diagrams

Block Diagrams

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