LP8345CDT-1.8 NSC [National Semiconductor], LP8345CDT-1.8 Datasheet

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LP8345CDT-1.8

Manufacturer Part Number
LP8345CDT-1.8
Description
Low Dropout, Low IQ, 500mA CMOS Linear Regulator
Manufacturer
NSC [National Semiconductor]
Datasheet
© 2003 National Semiconductor Corporation
LP8345
Low Dropout, Low IQ, 500mA CMOS Linear Regulator
General Description
The LP8345 low-dropout CMOS linear regulator are avail-
able in 5V, 3.3V, 2.5V, 1.8V or adjustable output versions.
Packaged in our 6ld LLP package and 3ld DPAK they can
deliver up to 500mA output current.
Typical dropout voltage
version, 270mV for the 3.3V version and 335mV for the 2.5V
version.
The devices include a zener trimmed bandgap voltage ref-
erence, foldback current limiting and thermal overload limit-
ing.
The LP8345 features a PMOS output transistor which unlike
PNP type low dropout regulators requires no base drive
current. This allows the device ground current to remain less
than 50µA over operating temperature, supply voltage and
irrespective of the load current.
Typical Applications
@
500mA is 210mV for the 5.0V
DS200648
Adjustable V
Fixed V
Features
n
n 210mV Typical Dropout
n Wide Operating Range
n Internal 500mA PMOS Output Transistor
n 19µA Typical Quiescent Current
n Thermal Overload Limiting
n Foldback Current Limiting
n Zener Trimmed Bandgap Reference
n Space saving LLP package
n Temperature Range
Applications
n Hard Disk Drives
n Notebook Computers
n Battery Powered Electronics
n Portable Instrumentation
OUT
±
— LP8345C
— LP8345I
OUT
1.5% Typical V
OUT
tolerance
20064801
20064802
@
500mA (V
O
= 5V)
−40˚C to 125˚C
October 2003
www.national.com
0˚C to 125˚C
2.7V to 10V

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LP8345CDT-1.8 Summary of contents

Page 1

LP8345 Low Dropout, Low IQ, 500mA CMOS Linear Regulator General Description The LP8345 low-dropout CMOS linear regulator are avail- able in 5V, 3.3V, 2.5V, 1.8V or adjustable output versions. Packaged in our 6ld LLP package and 3ld DPAK they can ...

Page 2

... Units Tape and Reel 1k Units Tape and Reel L076B 4.5k Units Tape and Reel 1k Units Tape and Reel L077B 4.5k Units Tape and Reel 75 Units/Rail LP8345CDT-1.8 2.5k Units Tape and Reel 75 Units/Rail LP8345CDT-2.5 2.5k Units Tape and Reel 75 Units/Rail LP8345CDT-3.3 2.5k Units Tape and Reel 75 Units/Rail LP8345CDT-5 ...

Page 3

Connection Diagrams 6-Pin LLP FIXED OUTPUT VOLTAGE Bottom View Note: V Pins (Pin 1 & 6) must be connected together externally for full 500mA operation (250mA max per pin Sense (Pin 5) must be connected to V OUT ...

Page 4

Absolute Maximum Ratings 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications Sense, ADJ IN OUT OUT Storage Temperature Range Junction Temperature ( ...

Page 5

LP8345C Electrical Characteristics Unless otherwise specified all limits guaranteed for V the full operating temperature range of T Symbol Parameter I Foldback Current Limit V LIMIT V Ripple Rejection Ratio Thermal Shutdown SD Temp. Thermal Shutdown Hyst. ...

Page 6

LP8345I Electrical Characteristics Unless otherwise specified all limits guaranteed for V the full operating temperature range of T Symbol Parameter ∆V Line Regulation O V − V Dropout Voltage IN O (Note 7) (Note 8) I Quiescent Current Q Minimum ...

Page 7

Typical Performance Characteristics Unless otherwise specified 1.5V Output Voltage Change vs. Temperature Ground Current vs. Temperature (I Ground Current vs. Input Voltage = C = 10µF X7R ceramic OUT Dropout Voltage ...

Page 8

Typical Performance Characteristics Load Transient Response Start-up Response Minimum Input Voltage Rise Time www.national.com (Continued) Line Transient Response 20064813 Minimum Input Voltage Rise Time 20064815 Minimum Input Voltage Rise Time 20064820 8 20064814 20064819 20064821 ...

Page 9

Typical Performance Characteristics Minimum Input Voltage Rise Time (Continued) Minimum Input Voltage Rise Time 20064822 9 20064823 www.national.com ...

Page 10

Applications Section GENERAL INFORMATION The LP8345 is a low-dropout, low quiescent current linear regulator. As shown in Figure 1 it consists of a 1.25V refer- ence, error amplifier, MOSFET driver, PMOS pass transistor and for the fixed output versions, an ...

Page 11

Applications Section (Continued) START UP CONSIDERATIONS Under certain operating conditions, overshoot of V start-up can occur. The observed overshoot is a function of rise time of V waveform start-up load current, and IN OUT V −V differential. The ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 6-Pin LLP NS Package Number LDE06A 3-Pin DPAK NS Package Number TD03B 12 ...

Page 13

LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support ...

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