LP38691SD-ADJ/NOPB National Semiconductor, LP38691SD-ADJ/NOPB Datasheet

IC REG LDO 500MA ADJ 6LLP

LP38691SD-ADJ/NOPB

Manufacturer Part Number
LP38691SD-ADJ/NOPB
Description
IC REG LDO 500MA ADJ 6LLP
Manufacturer
National Semiconductor
Series
PowerWise®r
Datasheet

Specifications of LP38691SD-ADJ/NOPB

Regulator Topology
Positive Adjustable
Voltage - Output
1.25 ~ 9 V
Voltage - Input
2.7 ~ 10 V
Voltage - Dropout (typical)
0.25V @ 500mA
Number Of Regulators
1
Current - Output
500mA
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
6-LLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Limit (min)
-
Other names
LP38691SD-ADJ
LP38691SD-ADJTR
© 2011 National Semiconductor Corporation
500mA Low Dropout CMOS Linear Regulators with
Adjustable Output
Stable with Ceramic Output Capacitors
General Description
The LP38691/3-ADJ low dropout CMOS linear regulators pro-
vide 2.0% precision reference voltage, extremely low dropout
voltage (250mV @ 500mA load current, V
cellent AC performance utilizing ultra low ESR ceramic output
capacitors.
The low thermal resistance of the LLP and SOT-223 pack-
ages allow the full operating current to be used even in high
ambient temperature environments.
The use of a PMOS power transistor means that no DC base
drive current is required to bias it allowing ground pin current
to remain below 100 µA regardless of load current, input volt-
age, or operating temperature.
Dropout Voltage: 250 mV (typ) @ 500mA (typ. 5V out).
Ground Pin Current: 55 µA (typ) at full load.
Adjust Pin Voltage: 2.0% (25°C) accuracy.
Typical Application Circuits
Note: *Minimum value required for stability.
201268
OUT
= 5V) and ex-
V
OUT
LP38691-ADJ
LP38693-ADJ
= V
ADJ
x (1 + R1/R2)
Features
Applications
LP38691QSD-ADJ is AEC-Q100 Grade 1
Output voltage range of 1.25V - 9V
2.0% adjust pin voltage accuracy (25°C)
Low dropout voltage: 250mV @ 500mA (typ, 5V out)
Wide input voltage range (2.7V to 10V)
Precision (trimmed) bandgap reference
Guaranteed specs for -40°C to +125°C
1µA off-state quiescent current
Thermal overload protection
Foldback current limiting
SOT-223 and 6-Lead LLP packages
Enable pin (LP38693-ADJ)
Hard Disk Drives
Notebook Computers
Battery Powered Devices
Portable Instrumentation
20126801
20126802
March 17, 2011
www.national.com

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LP38691SD-ADJ/NOPB Summary of contents

Page 1

... Dropout Voltage: 250 mV (typ) @ 500mA (typ. 5V out). Ground Pin Current: 55 µA (typ) at full load. Adjust Pin Voltage: 2.0% (25°C) accuracy. Typical Application Circuits Note: *Minimum value required for stability. © 2011 National Semiconductor Corporation LP38691-ADJ LP38693-ADJ Features ■ LP38691QSD-ADJ is AEC-Q100 Grade 1 ■ ...

Page 2

... Connection Diagrams 6-Lead LLP, Top View LP38691SD-ADJ Pin Descriptions Pin This is the input supply voltage to the regulator. For LLP package devices, both together for full current operation (250mA maximum per pin). Circuit ground for the regulator. For the SOT-223 package this is thermally connected to the die and GND functions as a heat sink when the soldered down to a large copper plane ...

Page 3

... Ordering Information Order Grade Number LP38691SD-ADJ Standard LP38691SDX-ADJ Standard LP38691QSD-ADJ Automotive LP38691QSDX-ADJ Automotive LP38693MP-ADJ Standard LP38693MPX-ADJ Standard LP38693SD-ADJ Standard LP38693SDX-ADJ Standard Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC Q100 standard. Automotive Grade products are identified with the letter Q ...

Page 4

... 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 Temp. (Soldering, 5 seconds) ESD Rating (Note 3) Power Dissipation (Note 2) V(max) All pins (with respect to GND) I OUT Junction Temperature Electrical Characteristics the full operating temperature range ...

Page 5

Symbol Parameter e Output Noise n V (LEAK) Output Leakage Current O V Enable Voltage (LP38693-ADJ EN Only) I Enable Pin Leakage (LP38693- EN ADJ Only) Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may ...

Page 6

Block Diagrams FIGURE 2. LP38693-ADJ Functional Diagram (SOT-223, LLP) www.national.com FIGURE 1. LP38691-ADJ Functional Diagram (LLP) 6 20126806 20126807 ...

Page 7

Typical Performance Characteristics pin is tied to V (LP38693-ADJ only Noise vs Frequency Noise vs Frequency Ripple Rejection Unless otherwise specified 1.25V 2.7V 10mA 20126835 20126837 20126819 7 = ...

Page 8

V vs Temperature REF Line Transient Response Line Transient Response www.national.com Line Transient Response 20126830 Line Transient Response 20126824 Line Transient Response 20126826 8 20126823 20126825 20126827 ...

Page 9

Line Transient Response 20126828 Load Transient Response Load Regulation vs Temperature 20126854 Load Transient Response Enable Voltage vs Temperature 20126844 Line Regulation vs Temperature 9 20126842 20126853 20126855 www.national.com ...

Page 10

OUT IN OUT Power-Up OUT OFF (LP38693 Only) OUT EN www.national.com = 1.25V 20126858 20126860 20126862 1.80V OUT IN ...

Page 11

Dropout Voltage vs I OUT (V = 1.8V) OUT 20126857 11 www.national.com ...

Page 12

Application Hints EXTERNAL CAPACITORS Like any low-dropout regulator, external capacitors are re- quired to assure stability. These capacitors must be correctly selected for proper performance. INPUT CAPACITOR: An input capacitor of at least 1µF is re- quired (ceramic recommended). The ...

Page 13

... DAP may be left floating (i.e. no electrical connection). The DAP must not be connected to any potential other than ground. For the LP38691SD-ADJ and LP38693SD-ADJ in the SDE06A 6-Lead LLP package, the junction-to-case thermal rating, θ 10.4°C/W, where the case is the bottom of the JC package at the center of the DAP ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 6-lead, LLP Package NS Package Number SDE06A SOT-223 Package NS Package Number MP05A 14 ...

Page 15

Notes 15 www.national.com ...

Page 16

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