LP38853MR-ADJ/NOPB National Semiconductor, LP38853MR-ADJ/NOPB Datasheet

IC REG LDO 3A ADJ OUT 8-PSOP

LP38853MR-ADJ/NOPB

Manufacturer Part Number
LP38853MR-ADJ/NOPB
Description
IC REG LDO 3A ADJ OUT 8-PSOP
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet

Specifications of LP38853MR-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
0.8 ~ 1.8 V
Voltage - Input
1.04 ~ 5.5 V
Voltage - Dropout (typical)
0.24V @ 3A
Number Of Regulators
1
Current - Output
3A (Max)
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-PSOP
For Use With
LP38853EVAL - BOARD EVALUATION LP38853
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
*LP38853MR-ADJ/NOPB
LP38853MR-ADJ

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LP38853MR-ADJ/NOPB
Manufacturer:
TI
Quantity:
25
Part Number:
LP38853MR-ADJ/NOPB
Manufacturer:
NS
Quantity:
1
© 2008 National Semiconductor Corporation
LP38853
3A Fast-Response High-Accuracy Adjustable LDO Linear
Regulator with Enable and Soft-Start
General Description
The LP38853-ADJ is a high current, fast response regulator
which can maintain output voltage regulation with extremely
low input to output voltage drop. Fabricated on a CMOS pro-
cess, the device operates from two input voltages: V
provides voltage to drive the gate of the N-MOS power tran-
sistor, while V
the load. The use of an external bias rail allows the part to
operate from ultra low V
the CMOS architecture consumes extremely low quiescent
current at any output load current. The use of an N-MOS
power transistor results in wide bandwidth, yet minimum ex-
ternal 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 part is avail-
able in PSOP 8–pin, TO-220 7–pin, and TO-263 7-pin pack-
ages.
Dropout Voltage: 240 mV (typical) at 3A load current.
Low Ground Pin Current: 10 mA (typical) at 3A load current.
Soft-Start: Programmable Soft-Start time.
Precision ADJ Voltage: ±1.5% for T
0°C
Typical Application Circuit
T
J
+125°C, across all line and load conditions
IN
is the input voltage which supplies power to
IN
voltages. Unlike bipolar regulators,
J
= 25°C, and ±2.0% for
201310
BIAS
Features
Applications
Adjustable V
Wide V
Stable with 10µF Ceramic capacitors
Dropout voltage of 240 mV (typical) at 3A load current
Precision V
— ±1.5% V
— ±2.0% V
— ±3.0% V
Over-Temperature and Over-Current protection
Available in 8 lead PSOP, 7 lead TO-220 and 7 lead
TO-263 packages
−40°C to +125°C Operating Junction 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
ADJ
Supply operating range of 3.0V to 5.5V
ADJ
ADJ
ADJ
OUT
across all line and load conditions:
for T
for 0°C
for -40°C
range of 0.80V to 1.8V
J
= 25°C
T
J
T
J
20131001
+125°C
+125°C
February 19, 2008
www.national.com

Related parts for LP38853MR-ADJ/NOPB

LP38853MR-ADJ/NOPB Summary of contents

Page 1

... Soft-Start: Programmable Soft-Start time. Precision ADJ Voltage: ±1.5% for T ≤ ≤ 0°C T +125°C, across all line and load conditions J Typical Application Circuit © 2008 National Semiconductor Corporation Features ■ Adjustable V ■ Wide V ■ Stable with 10µF Ceramic capacitors BIAS ■ ...

Page 2

... Ordering Information V Order Number OUT LP38853S-ADJ LP38853SX-ADJ ADJ LP38853T-ADJ LP38853MR-ADJ LP38853MRX-ADJ Connection Diagrams TO263-7, Top View PSOP-8, Top View Pin Descriptions TO220-7 TO263-7 PSOP-8 Pin # Pin # TAB TAB - - www.national.com Package Type Package Drawing TO263-7 TO263-7 TO220-7 PSOP-8 PSOP-8 20131002 20131004 Pin ...

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 Soft-Start r Soft-Start internal resistance SS Soft-Start time × r × Enable I ENABLE pin Current EN V Enable Voltage Threshold EN(ON) V Enable Voltage Hysteresis EN(HYS) t Turn-OFF ...

Page 5

Typical Performance Characteristics specified 25° 1.40 kΩ 1.00 kΩ Ceramic µF Ceramic, C OUT BIAS V Ground Pin Current (I BIAS GND(BIAS) V Ground Pin Current vs Temperature IN ...

Page 6

V vs Temperature OUT UVLO Thresholds vs Temperature OUT SS www.national.com 20131067 Soft-Start r SS 20131068 Enable Thresholds (V 20131076 OUT IN 20131072 Variation vs Temperature 20131075 ...

Page 7

Enable Pull-Down Current ( Temperature EN V Line Transient Response IN V Line Transient Response BIAS Enable Pull-Up Resistor (r 20131089 V Line Transient Response IN 20131077 V Line Transient Response BIAS 20131079 Temperature EN ...

Page 8

Load Transient Response, C Load Transient Response, C Load Transient Response, C www.national.com = 10 µF Ceramic Load Transient Response, C OUT 20131081 = 100 µF Ceramic Load Transient Response, C OUT 20131083 = 100 µF Tantalum Load Transient Response, ...

Page 9

V PSRR BIAS 20131070 Output Noise 20131069 9 V PSRR IN 20131071 www.national.com ...

Page 10

Block Diagram www.national.com 10 20131005 ...

Page 11

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

Page 12

TABLE OUT 0.8V 1.07 kΩ 1.78 kΩ 0.9V 1.50 kΩ 1.87 kΩ 1.0V 1.00 kΩ 1.00 kΩ 1.1V 1.65 kΩ 1.37 kΩ 1.2V 1.40 kΩ 1.00 kΩ 715 Ω 1.3V 1.15 kΩ 590 Ω 1.4V 1.07 ...

Page 13

Typical C values will be in the range 100 nF, SS providing typical Soft-Start ...

Page 14

... JA 125°C. Heat-Sinking The PSOP-8 Package The LP38853MR package has a θ a θ rating of 11°C/W. The θ JC the device DAP soldered to an area of 0.008 square inches (0. 0.09 in ounce copper, with no airflow. ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted TO-220 7-Lead, Stagger Bend Package (TO220-7) TO-263 7-Lead, Molded, Surface Mount Package (TO263-7) NS Package Number TA07B NS Package Number TS7B 15 www.national.com ...

Page 16

PSOP, 8 Lead, Molded, 0.050in Pitch NS Package Number MRA08B 16 ...

Page 17

Notes 17 www.national.com ...

Page 18

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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