LP38855S-1.2/NOPB National Semiconductor, LP38855S-1.2/NOPB Datasheet

IC REG LDO 1.5A 1.2V TO263-5

LP38855S-1.2/NOPB

Manufacturer Part Number
LP38855S-1.2/NOPB
Description
IC REG LDO 1.5A 1.2V TO263-5
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet

Specifications of LP38855S-1.2/NOPB

Regulator Topology
Positive Fixed
Voltage - Output
1.2V
Voltage - Input
Up to 5.5V
Voltage - Dropout (typical)
0.13V @ 1.5A
Number Of Regulators
1
Current - Output
1.5A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
TO-263-5, D²Pak (5 leads + Tab), TO-263BA
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
*LP38855S-1.2/NOPB
LP38855S-1.2
© 2007 National Semiconductor Corporation
LP38855
1.5A Fast-Response High-Accuracy LDO Linear Regulator
with Enable
General Description
The LP38855 is a high-current, fast-response regulator which
can maintain output voltage regulation with an extremely low
input to output voltage drop. Fabricated on a CMOS process,
the device operates from two input voltages: V
power for the internal bias and control circuits, as well as drive
for the gate of the N-MOS power transistor, while V
power to the load. The use of an external bias rail allows the
part to operate from ultra low V
ulators, the CMOS architecture consumes extremely low qui-
escent current at any output load current. The use of an N-
MOS power transistor results in wide bandwidth, yet minimum
external capacitance is required to maintain loop stability.
The fast transient response of this device makes it suitable
for use in powering DSP, Microcontroller Core voltages and
Switch Mode Power Supply post regulators. The LP38855 is
available in TO-220 and TO-263 5-Lead packages.
Dropout Voltage: 130 mV (typical) at 1.5A load current.
Low Ground Pin Current: 14 mA (typical) at 1.5A load cur-
rent.
Shutdown Current: 1 µA (typical) I
Precision Output Voltage: ±1.0% for T
for 0°C
Typical Application Circuit
T
J
+125°C, across all line and load conditions
IN
voltages. Unlike bipolar reg-
IN(GND)
J
202026
when EN pin is low.
= 25°C and ±2.0%
BIAS
IN
provides
supplies
Features
Applications
Standard V
Wide V
Stable with 10 µF ceramic capacitors
Dropout voltage of 130 mV (typical) at 1.5A load current
Precision Output Voltage across all line and load
conditions:
— ±1.0% for T
— ±2.0% for 0°C
— ±3.0% for -40°C
Over-Temperature and Over-Current protection
Available in 5 lead TO-220 and TO-263 packages
Custom V
-40°C to +125°C Operating Temperature Range
ASIC Power Supplies In:
- Desktops, Notebooks, and Graphics Cards, Servers
- Gaming Set Top Boxes, Printers and Copiers
Server Core and I/O Supplies
DSP and FPGA Power Supplies
SMPS Post-Regulator
BIAS
OUT
OUT
Supply operating range of 3.0V to 5.5V
values between 0.8V and 1.2V are available
J
values of 0.8V and 1.2V
= 25°C
T
J
T
J
+125°C
+125°C
20202601
December 2006
www.national.com

Related parts for LP38855S-1.2/NOPB

LP38855S-1.2/NOPB Summary of contents

Page 1

... Shutdown Current: 1 µA (typical) I IN(GND) Precision Output Voltage: ±1.0% for T ≤ ≤ for 0°C T +125°C, across all line and load conditions J Typical Application Circuit © 2007 National Semiconductor Corporation Features ■ Standard V ■ Wide V BIAS ■ Stable with 10 µF ceramic capacitors provides BIAS ■ ...

Page 2

... Ordering Information V * Order Number OUT LP38855S-0.8 0.8V LP38855SX-0.8 LP38855T-0.8 LP38855S-1.2 1.2V LP38855SX-1.2 LP38855T-1.2 * For custom V values between 0.8V and 1.2V please contact the National Semiconductor Sales Office. OUT Connection Diagrams TO-263, Top View Pin Descriptions Pin # Pin Symbol GND 4 OUT 5 BIAS ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Storage Temperature Range Lead Temperature Soldering, 5 seconds ESD Rating Human Body Model (Note 2) Power Dissipation (Note 3) V Supply Voltage (Survival Supply Voltage (Survival) ...

Page 4

Symbol Parameter ENABLE Pin I ENABLE pin Current EN V Enable Voltage Threshold EN(ON) V Enable Voltage Hysteresis EN(HYS) t Turn-OFF Delay Time OFF t Turn-ON Delay Time ON AC Parameters PSRR Ripple Rejection for Voltage ...

Page 5

Typical Performance Characteristics V = 3.0V mA BIAS OUT IN OUT V Ground Pin Current (I BIAS GND(BIAS) V Ground Pin Current (I IN GND(IN) Dropout Voltage ( Temperature DO Unless otherwise ...

Page 6

V vs Temperature OUT Enable Thresholds (V EN Enable Pull-Up Resistor (r www.national.com 20202667 ) vs Temperature Enable Pull-Down Current (I 20202672 ) vs Temperature EN 20202674 6 UVLO Thresholds vs Temperature 20202668 ) vs Temperature EN 20202673 V Line ...

Page 7

V Line Transient Response IN V Line Transient Response BIAS = 10 μF Ceramic Load Transient Respose, C OUT V Line Transient Response BIAS 20202678 Load Transient Response, C 20202680 Load Transient Response, C 20202682 7 20202679 = 10 μF ...

Page 8

Load Transient Response, C Load Transient Response PSRR IN www.national.com = 100 μF Ceramic Load Transient Response, C OUT 20202684 = 100 μF Tantalum OUT 20202686 20202671 8 = 100 μF Tantalum OUT 20202685 V PSRR BIAS 20202670 ...

Page 9

Block Diagram 9 20202605 www.national.com ...

Page 10

Application Information EXTERNAL CAPACITORS To assure regulator stability, capacitors are required on the input, output and bias pins as shown in the Typical Application Circuit. Output Capacitor A minimum output capacitance of 10 µF, ceramic, is required for stability. The ...

Page 11

The second part is the power that is dissipated in the bias and control circuitry, and can be determined with the formula × I D(BIAS) BIAS GND(BIAS) where I is the portion of the operating ground current ...

Page 12

Physical Dimensions TO220 5-lead, Molded, Stagger Bend Package (TO220-5) TO263 5-Lead, Molded, Surface Mount Package (TO263-5) www.national.com inches (millimeters) unless otherwise noted NS Package Number T05D NS Package Number TS5B 12 ...

Page 13

Notes 13 www.national.com ...

Page 14

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

Related keywords