LP2952 National Semiconductor, LP2952 Datasheet

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LP2952

Manufacturer Part Number
LP2952
Description
Adjustable Micropower Low-Dropout Voltage Regulators
Manufacturer
National Semiconductor
Datasheet

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© 1999 National Semiconductor Corporation
LP2952/LP2952A/LP2953/LP2953A
Adjustable Micropower Low-Dropout Voltage Regulators
General Description
The LP2952 and LP2953 are micropower voltage regulators
with very low quiescent current (130 µA typical at 1 mA load)
and very low dropout voltage (typ. 60 mV at light load and
470 mV at 250 mA load current). They are ideally suited for
battery-powered systems. Furthermore, the quiescent cur-
rent increases only slightly at dropout, which prolongs bat-
tery life.
The LP2952 and LP2953 retain all the desirable characteris-
tics of the LP2951, but offer increased output current, addi-
tional features, and an improved shutdown function.
The internal crowbar pulls the output down quickly when the
shutdown is activated.
The error flag goes low if the output voltage drops out of
regulation.
Reverse battery protection is provided.
The internal voltage reference is made available for external
use, providing a low-T.C. reference with very good line and
load regulation.
The parts are available in DIP and surface mount packages.
Block Diagrams
LP2952
DS011127
DS011127-1
Features
n Output voltage adjusts from 1.23V to 29V
n Guaranteed 250 mA output current
n Extremely low quiescent current
n Low dropout voltage
n Extremely tight line and load regulation
n Very low temperature coefficient
n Current and thermal limiting
n Reverse battery protection
n 50 mA (typical) output pulldown crowbar
n 5V and 3.3V versions available
LP2953 Versions Only
n Auxiliary comparator included with CMOS/TTL
Applications
n High-efficiency linear regulator
n Regulator with under-voltage shutdown
n Low dropout battery-powered regulator
n Snap-ON/Snap-OFF regulator
compatible output levels. Can be used for fault
detection, low input line detection, etc.
LP2953
www.national.com
May 1999
DS011127-2

Related parts for LP2952

LP2952 Summary of contents

Page 1

... Furthermore, the quiescent cur- rent increases only slightly at dropout, which prolongs bat- tery life. The LP2952 and LP2953 retain all the desirable characteris- tics of the LP2951, but offer increased output current, addi- tional features, and an improved shutdown function. The internal crowbar pulls the output down quickly when the shutdown is activated ...

Page 2

... DIP LP2952 16-Pin SO Ordering Information LP2952 Temp. Package Order Range Number (T ) ˚C J LP2952IN, −40 to 14-Pin LP2952AIN, +125 Molded LP2952IN-3.3, LP2952AIN-3.3 LP2952IM, −40 to 16-Pin LP2952AIM, +125 Surface LP2952IM-3.3, Mount LP2952AIM-3.3 www.national.com DS011127-11 DS011127-12 LP2953 NSC Order Drawing Number Number N14A LP2953IN, LP2953AIN, DIP LP2953IN-3 ...

Page 3

... Regulation = 250 mA Output Voltage Load I L Regulation (Note (Note 1) Maximum Junction Temperature LP2952I, LP2953I, LP2952AI, LP2953AI, LP2952I-3.3, LP2953I-3.3, LP2952AI-3.3, LP2953AI-3.3 LP2953AM T +150˚C A Input Supply Voltage Feedback Input Voltage (Note 3) Comparator Input Voltage (Note 4) Shutdown Input Voltage (Note 4) T +125˚ ...

Page 4

... O (NOM 30V 200 µA 0. LP2952I, LP2953I, Units LP2952I-3.3, LP2953I-3.3 Max Min Max 100 100 mV 150 150 300 300 420 420 400 400 520 520 600 600 800 800 ...

Page 5

... LP2953AM 3 −7.5 − −30 −50 LP2953AM 10 −30 −75 0.01 LP2953AM 0.01 150 LP2953AM 150 (MAX), the junction-to-ambient thermal resistance LP2952I, LP2953I, Units LP2952I-3.3, LP2953I-3.3 Max Min Max 1 1 µ 250 250 mV 400 400 −35 −80 −35 mV −25 −95 − ...

Page 6

Electrical Characteristics Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. See APPLICATION HINTS for additional information on heatsinking and thermal resistance. Note 3: When used in dual-supply systems where ...

Page 7

Typical Performance Characteristics = 3V 25˚ 5V. (Continued OUT Ripple Rejection DS011127-33 Line Transient Response DS011127-36 Load Transient Response DS011127-39 Enable Transient DS011127-42 Unless otherwise specified: V Ripple Rejection DS011127-34 Line Transient Response ...

Page 8

Typical Performance Characteristics = 3V 25˚ 5V. (Continued OUT Feedback Bias Current DS011127-45 Comparator Sink Current DS011127-48 Thermal Regulation DS011127-51 www.national.com Unless otherwise specified: V Feedback Pin Current DS011127-46 Divider Resistance DS011127-49 Minimum ...

Page 9

... Application Hints HEATSINK REQUIREMENTS (Industrial Temperature Range Devices) The maximum allowable power dissipation for the LP2952/ LP2953 is limited by the maximum junction temperature (+125˚C) and the external factors that determine how quickly heat flows away from the part: the ambient temperature and the junction-to-ambient thermal resistance for the specific application ...

Page 10

... Surface LP2952IM-3.3, Mount LP2952AIM-3.3, LP2953IM, LP2953AIM, LP2953IM-3.3, LP2953AIM-3.3 Figure 2 shows copper patterns which may be used to dissi- pate heat from the LP2952 and LP2953. Table 2 shows some values of junction-to-ambient thermal resistance ( for values of L and W for 1 oz. copper. www.national.com DS011127 ...

Page 11

Application Hints (Continued) KOVAR lead frame (unlike the industrial parts, which have a copper lead frame). The KOVAR material is necessary to at- tain the hermetic seal required in military applications. The KOVAR lead frame does not conduct heat as ...

Page 12

Application Hints (Continued) * See Application Hints ** Drive with TTL-low to shut down FIGURE 4. Adjustable Regulator DROPOUT VOLTAGE The dropout voltage of the regulator is defined as the mini- mum input-to-output voltage differential required for the out- put ...

Page 13

Application Hints (Continued) If the Shutdown input is driven from a source that actively pulls high and low (like an op-amp), the pull-up resistor is not required, but may be used. If the shutdown function is not to be used, ...

Page 14

Typical Applications (Continued) 5V Battery Powered Supply with Backup and Low Battery Flag The circuit switches to the NI-CAD backup battery when the main battery voltage drops below about 5.6V, and returns to the main battery when its voltage is ...

Page 15

Typical Applications (Continued) 5V Regulator with Snap-On/Snap-Off Feature and Hysteresis = 5.87V * Turns 5.64V Turns OFF (for component values shown) 5V Regulator with Timed Power-On Reset, Snap-On/Snap-Off Feature and Hysteresis 5V ...

Page 16

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LP2953AMJ/883, 5962-9233601MEA, LP2953AMJ-QMLV, 5962-9233601VEA Order Number LP2952IM, LP2952AIM, LP2952IM-3.3, LP2952AIM-3.3, LP2953IM, LP2953AIM, LP2953IM-3.3 or LP2953AIM-3.3 www.national.com 16-Pin Ceramic DIP NS Package Number J16A 16-Pin Surface Mount NS Package Number M16A 16 ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LP2952IN, LP2952AIN, LP2952IN-3.3 or LP2952AIN-3.3 Order Number LP2953IN, LP2953AIN, LP2953IN-3.3 or LP2953AIN-3.3 14-Pin Molded DIP NS Package Number N14A 16-Pin Molded DIP NS Package Number N16A 17 www.national.com ...

Page 18

... 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 devices or systems are devices or systems which, (a) are intended for surgical implant ...

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