LP2966IMM-1833 National Semiconductor, LP2966IMM-1833 Datasheet

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LP2966IMM-1833

Manufacturer Part Number
LP2966IMM-1833
Description
Dual 150mA Ultra Low-Dropout Regulator
Manufacturer
National Semiconductor

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© 2000 National Semiconductor Corporation
LP2966
Dual 150mA Ultra Low-Dropout Regulator
General Description
The LP2966 dual ultra low-dropout (LDO) regulator operates
from a +2.70V to +7.0V input supply. Each output delivers
150mA over full temperature range. The IC operates with ex-
tremely low drop-out voltage and quiescent current, which
makes it very suitable for battery powered and portable ap-
plications. Each LDO in the LP2966 has independent shut-
down capability. The LP2966 provides low noise perfor-
mance with low ground pin current in an extremely small
MSOP-8 package (refer to package dimensions and connec-
tion diagram for more information on MSOP-8 package). A
wide range of preset voltage options are available for each
output. In addition to the voltage combinations listed in the
ordering information table, many more are available upon re-
quest with minimum orders. In all, 256 voltage combinations
are possible.
Key Specifications
Dropout Voltage: Varies linearly with load current. Typically
0.9 mV at 1mA load current and 135mV at 150mA load cur-
rent.
Ground Pin Current: Typically 300µA at 1mA load current
and 340µA at 100mA load current (with one shutdown pin
pulled low).
Shutdown Mode: Less than 1µA quiescent current when
both shutdown pins are pulled low.
Error Flag: Open drain output, goes low when the corre-
sponding output drops 10% below nominal.
Precision Output Voltage: Multiple output voltage options
available ranging from 1.8V to 5.0V with a guaranteed accu-
racy of
Typical Application Circuit
*SD1 and SD2 must be actively terminated through a pull up resistor. Tie to V
**ERROR1 and ERROR2 are open drain outputs. These pins must be connected to ground if not used.
# Minimum output capacitance is 1µF to insure stability over full load current range. More capacitance improves superior dynamic performance and provides
additional stability margin.
±
1% at room temperature.
DS100850
IN
Features
n Ultra low drop-out voltage
n Low ground pin current
n
n Independent shutdown of each LDO regulator
n Output voltage accuracy
n Guaranteed 150mA output current at each output
n Low output noise
n Error Flags indicate status of each output
n Available in MSOP-8 surface mount packages
n Low output capacitor requirements (1µF)
n Operates with Low ESR ceramic capacitors in most
n Over temperature/over current protection
n -40˚C to +125˚C junction temperature range
Applications
n Cellular and Wireless Applications
n Palmtop/Laptop Computer
n GPS systems
n Flat panel displays
n Post regulators
n USB applications
n Hand held equipment and multimeters
n Wireless data terminals
n Other battery powered applications
if not used.
applications
<
1µA quiescent current in shutdown mode
±
1%
DS100850-30
www.national.com
April 2000

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LP2966IMM-1833 Summary of contents

Page 1

... ERROR2 are open drain outputs. These pins must be connected to ground if not used. # Minimum output capacitance is 1µF to insure stability over full load current range. More capacitance improves superior dynamic performance and provides additional stability margin. © 2000 National Semiconductor Corporation Features n Ultra low drop-out voltage n Low ground pin current < ...

Page 2

Block Diagram Connection Diagram Pin Description Pin Name 1 VIN Input Supply pin 2 SD1 Active low shutdown pin for output 1 3 SD2 Active low shutdown pin for output 2 4 GND Ground 5 ERROR2 Error flag for output ...

Page 3

... LACB LP2966IMM-2830 LASB LP2966IMMX-2830 LASB LP2966IMM-2828 LABB LP2966IMMX-2828 LABB LP2966IMM-2525 LAAB LP2966IMMX-2525 LAAB LP2966IMM-1833 LCFB LP2966IMMX-1833 LCFB LP2966IMM-1818 LA9B LP2966IMMX-1818 LA9B 3 Supplied As: 1000 units on tape and reel 3500 units on tape and reel 1000 units on tape and reel 3500 units on tape and reel ...

Page 4

... V 0.1V SD1 SD2 (Note OUT OUT(NOM) (Note 2), (Note 14) 4 −0.3V to (Vin + 0.3V) (Note 1) 2.7V to 7.0V −0.3V to (Vin + 0.3V) −40˚C to +125˚C = 1mA 1µ OUT IN SD1 SD2 LP2966IMM (Note 5) Typ (Note 4) Min Max 0.0 − 0.0 −1.5 1.5 -3.5 3.5 0.1 0.1 0.0004 0.9 2.0 3.0 90 130 180 135 ...

Page 5

... OUT BW = 300Hz − 300kHz 10µF OUT resistor into each pin. and V terminals that is normally reverse-biased. Reversing the polarity from V IN OUT 5 = 1mA 1µ OUT IN SD1 SD2 LP2966IMM (Note 5) Typ (Note 4) Min Max 165 ...

Page 6

Electrical Characteristics Note 14: LP2966 has fold back current limited short circuit protection. The knee is the current at which the output voltage drops 10% below the nominal value. Note 15 the shutdown pin voltage threshold below which ...

Page 7

Typical Performance Characteristics C =1µ 1mA, C =1µF, V OUT OUT IN SD1 Ground Pin Current vs Supply Voltage (one LDO on) Ground Pin Current vs Load Current over temperature (one LDO on) Output Voltage vs Temperature Unless ...

Page 8

Typical Performance Characteristics C =1µ 1mA, C =1µF, V OUT OUT IN Input Voltage vs Output Voltage Ground Pin Current vs Input Voltage (Both LDOs off) Line Transient Response (C = 2.2µ 1mA) OUT OUT www.national.com ...

Page 9

Typical Performance Characteristics C =1µ 1mA, C =1µF, V OUT OUT IN SD1 Line Transient Response (C = 2.2µ 100mA) OUT OUT Line Transient Response (C = 10µ 1mA) OUT OUT Line Transient Response ...

Page 10

Typical Performance Characteristics C =1µ 1mA, C =1µF, V OUT OUT IN Load Transient Response (C = 2.2µF) OUT Load Transient Response (C = 10µF) OUT Cross-Channel Isolation vs Frequency (I =1mA 1mA) OUT1 OUT2 www.national.com ...

Page 11

Typical Performance Characteristics C =1µ 1mA, C =1µF, V OUT OUT IN SD1 Output Voltage Cross-Coupling Power Supply Ripple Rejection Unless otherwise specified and T = 25˚C. (Continued) SD2 IN A Output ...

Page 12

Applications Information Input Capacitor Selection LP2966 requires a minimum input capacitance of 1µF be- tween the input and ground pins to prevent any impedance interactions with the supply. This capacitor should be located very close to the input pin. This ...

Page 13

Applications Information The internal error flag comparators have open drain output stages. Hence, the ERROR pins should be pulled high through a pull up resistor. Although the ERROR pin can sink current of 1mA, this current adds to the battery ...

Page 14

Applications Information www.national.com (Continued) DS100850-36 DS100850-37 14 DS100850-38 DS100850-39 DS100850-40 ...

Page 15

... 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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