LP38852MR-ADJ/NOPB National Semiconductor, LP38852MR-ADJ/NOPB Datasheet

IC REG LDO 1.5A LOW I/O 8-PSOP

LP38852MR-ADJ/NOPB

Manufacturer Part Number
LP38852MR-ADJ/NOPB
Description
IC REG LDO 1.5A LOW I/O 8-PSOP
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet
1.LP38852EVAL.pdf (18 pages)

Specifications of LP38852MR-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
0.8 ~ 1.8 V
Voltage - Input
0.93 ~ 5.5 V
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
8-PSOP
For Use With
LP38852EVAL - BOARD EVALUATION LP38852
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
LP38852MR-ADJ

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
BOSTOCK HK LIMITED BOSTOCK HK LIMITED
Part Number:
LP38852MR-ADJ/NOPB
Manufacturer:
TI
Quantity:
1 000
© 2010 National Semiconductor Corporation
1.5A Fast-Response High-Accuracy Adjustable LDO Linear
Regulator with Enable and Soft-Start
General Description
The LP38852-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 the TO-220 and TO-263 7-pin packages.
Dropout Voltage: 130 mV (typical) at 1.5A load current.
Low Ground Pin Current: 14 mA (typical) at 1.5A load cur-
rent.
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
202139
BIAS
LP38852
Features
■
■
■
■
■
■
■
■
Applications
■
■
■
■
Adjustable V
Wide V
Stable with 10µF Ceramic capacitors
Dropout voltage of 130 mV (typical) at 1.5A load current
Precision Output Voltage across all line and load
conditions:
— ±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
Supply operating range of 3.0V to 5.5V
ADJ
ADJ
ADJ
OUT
for T
for 0°C
for -40°C
range of 0.80V to 1.8V
J
= 25°C
≤
≤
T
J
T
≤
J
≤
+125°C
20213901
+125°C
September 30, 2010
www.national.com

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LP38852MR-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 © 2010 National Semiconductor Corporation LP38852 Features ■ Adjustable V ■ Wide V ■ Stable with 10µF Ceramic capacitors ■ ...

Page 2

... Ordering Information V Order Number OUT LP38852S-ADJ LP38852SX-ADJ ADJ LP38852T-ADJ LP38852MR-ADJ LP38852MRX-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 20213902 ...

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 20213967 Soft-Start r SS 20213968 Enable Thresholds (V 20213976 OUT IN 20213972 Variation vs Temperature 20213975 ...

Page 7

Enable Pull-Down Current ( Temperature EN V Line Transient Response IN V Line Transient Response BIAS Enable Pull-Up Resistor (r 20213989 V Line Transient Response IN 20213977 V Line Transient Response BIAS 20213979 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 20213981 = 100 µF Ceramic Load Transient Response, C OUT 20213983 = 100 µF Tantalum Load Transient Response, ...

Page 9

V PSRR BIAS 20213970 Output Noise 20213969 9 V PSRR IN 20213971 www.national.com ...

Page 10

Block Diagram www.national.com 10 20213905 ...

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 times in the range of 70 μ (5τ). Values less than 1 nF can be used, but the Soft-Start ...

Page 14

... JA 125°C. Heat-Sinking The PSOP-8 Package The LP38852MR package has a θ 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: www.national.com Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...

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