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LP38843 Datasheet

3A Ultra Low Dropout Linear Regulators Stable

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December 2004
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LP38843
3A Ultra Low Dropout Linear Regulators
Stable with Ceramic Output Capacitors
General Description
The LP38843 is a high-current, fast-response regulator
which can maintain output voltage regulation with minimum
input to output voltage drop. Fabricated on a CMOS process,
the device operates from two input voltages: Vbias provides
voltage to drive the gate of the N-MOS power transistor,
while Vin is the input voltage which supplies power to the
load. The use of an external bias rail allows the part to
operate from ultra low Vin voltages. Unlike bipolar regula-
tors, the CMOS architecture consumes extremely low quies-
cent current at any output load current. The use of an
N-MOS power transistor results in wide bandwidth, yet mini-
mum external capacitance is required to maintain loop sta-
bility.
The fast transient response of these devices makes them
suitable for use in powering DSP, Microcontroller Core volt-
ages and Switch Mode Power Supply post regulators. The
parts are available in TO-220 and TO-263 packages.
Dropout Voltage: 210 mV (typ) @ 3A load current.
Quiescent Current: 30 mA (typ) at full load.
Shutdown Current: 30 nA (typ) when S/D pin is low.
Precision Output Voltage: 1.5% room temperature accu-
racy.
Features
n Ideal for conversion from 1.8V or 1.5V inputs
n Designed for use with low ESR ceramic capacitors
n 0.8V, 1.2V and 1.5V standard voltages available
n Ultra low dropout voltage (210mV @ 3A typ)
n 1.5% initial output accuracy
n Load regulation of 0.1%/A (typical)
n 30nA quiescent current in shutdown (typical)
n Low ground pin current at all loads
n Over temperature/over current protection
n Available in 5 lead TO220 and TO263 packages
n −40˚C to +125˚C junction temperature range
Applications
n ASIC Power Supplies In:
- Desktops, Notebooks, and Graphics Cards, Servers
- Gaming Set Top Boxes, Printers and Copiers
n Server Core and I/O Supplies
n DSP and FPGA Power Supplies
n SMPS Post-Regulator
Typical Application Circuit
* Minimum value required if Tantalum capacitor is used (see Application Hints).
20102901
© 2004 National Semiconductor Corporation DS201029
www.national.com


National Semiconductor Electronic Components Datasheet

LP38843 Datasheet

3A Ultra Low Dropout Linear Regulators Stable

No Preview Available !

Connection Diagrams
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TO-220, Top View
20102902
TO-263, Top View
20102903
Pin Description
Pin Name
BIAS
OUTPUT
GND
INPUT
SHUTDOWN
Description
The bias pin is used to provide the low current bias voltage to the chip which operates the internal
circuitry and provides drive voltage for the N-FET.
The regulated output voltage is connected to this pin.
This is both the power and analog ground for the IC. Note that both pin three and the tab of the
TO-220 and TO-263 packages are at ground potential. Pin three and the tab should be tied together
using the PC board copper trace material and connected to circuit ground.
The high current input voltage which is regulated down to the nominal output voltage must be
connected to this pin. Because the bias voltage to operate the chip is provided seperately, the input
voltage can be as low as a few hundered millivolts above the output voltage.
This provides a low power shutdown function which turns the regulated output OFF. Tie to VBIAS if
this function is not used.
Ordering Information
Order Number
LP38843S-0.8
LP38843SX-0.8
LP38843T-0.8
LP38843S-1.2
LP38843SX-1.2
LP38843T-1.2
LP38843S-1.5
LP38843SX-1.5
LP38843T-1.5
Package Type
TO263-5
TO263-5
TO220-5
TO263-5
TO263-5
TO220-5
TO263-5
TO263-5
TO220-5
Package Drawing
TS5B
TS5B
T05D
TS5B
TS5B
T05D
TS5B
TS5B
T05D
Supplied As
Rail
Tape and Reel
Rail
Rail
Tape and Reel
Rail
Rail
Tape and Reel
Rail
www.national.com
2


Part Number LP38843
Description 3A Ultra Low Dropout Linear Regulators Stable
Maker National Semiconductor
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LP38843 Datasheet PDF






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