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LP2987IM-3.8 Schematic ( PDF Datasheet ) - National Semiconductor
| Teilenummer | LP2987IM-3.8 |
|
| Beschreibung | Micropower/ 200 mA Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988) | |
| Hersteller | National Semiconductor | |
| Logo |  |
|
Gesamt 19 Seiten 
March 1999
LP2987/LP2988
Micropower, 200 mA Ultra Low-Dropout Voltage
Regulator with Programmable Power-On Reset Delay;
Low Noise Version Available (LP2988)
General Description
The LP2987/8 are fixed-output 200 mA precision LDO volt-
age regulators with power-ON reset delay which can be
implemented using a single external capacitor.
The LP2988 is specifically designed for noise-critical appli-
cations. A single external capacitor connected to the Bypass
pin reduces regulator output noise.
Using an optimized VIP™ (Vertically Integrated PNP) pro-
cess, these regulators deliver superior performance:
Dropout Voltage: 180 mV @ 200 mA load, and 1 mV @ 1 mA
load (typical).
Ground Pin Current: 1 mA @ 200 mA load, and 200 µA @
10 mA load (typical).
Sleep Mode: The LP2987/8 draws less than 2 µA quiescent
current when shutdown pin is held low.
Error Flag/Reset: The error flag goes low when the output
drops approximately 5% below nominal. This pin also pro-
vides a power-ON reset signal if a capacitor is connected to
the DELAY pin.
Precision Output: Standard product versions of the LP2987
and LP2988 are available with output voltages of 5.0V, 3.8V,
3.3V, 3.2V, 3.0V, or 2.8V, with guaranteed accuracy of 0.5%
(“A” grade) and 1% (standard grade) at room temperature.
Features
n Ultra low dropout voltage
n Power-ON reset delay requires only one component
n Bypass pin for reduced output noise (LP2988)
n Guaranteed continuous output current 200 mA
n Guaranteed peak output current > 250 mA
n SO-8 and mini SO-8 surface mount packages
n <2 µA quiescent current when shutdown
n Low ground pin current at all loads
n 0.5% output voltage accuracy (“A” grade)
n Wide supply voltage range (16V max)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Cellular Phone
n Palmtop/Laptop Computer
n Camcorder, Personal Stereo, Camera
Block Diagrams
DS100017-1
VIP™ is a trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS100017
DS100017-2
www.national.com
 
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Operating Junction
Temperature Range
Lead Temperature
(Soldering, 5 seconds)
ESD Rating (Note 2)
Power Dissipation (Note 3)
Input Supply Voltage
(Survival)
−65˚C to +150˚C
−40˚C to +125˚C
260˚C
2 kV
Internally Limited
−0.3V to +16V
Input Supply Voltage
(Operating)
Shutdown Pin
Sense Pin
Output Voltage
(Survival) (Note 4)
IOUT (Survival)
Input-Output Voltage
(Survival) (Note 5)
2.1V to +16V
−0.3V to +16V
−0.3V to +6V
−0.3V to +16V
Short Circuit Protected
−0.3V to +16V
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: VIN = VO(NOM) + 1V, IL = 1 mA, COUT = 4.7 µF, CIN = 2.2 µF, VS/D = 2V.
Symbol
Parameter
Conditions
Typical
LM2987/8AI-X.X
(Note 6)
Min Max
LM2987/8I-X.X
(Note 6)
Min Max
Units
∆VO Output Voltage
Tolerance
0.1 mA < IL < 200 mA
−0.5 0.5 −1.0 1.0
−0.8 0.8 −1.6 1.6 %VNOM
−1.8 1.8 −2.8 2.8
Output Voltage Line
Regulation
VO(NOM) + 1V ≤ VIN ≤
16V
0.007
0.014
0.032
0.014
0.032
%/V
VIN– VO
Dropout Voltage
(Note 7)
IL = 100 µA
2.0 2.0
1
3.5 3.5
IL = 75 mA
120 120
90 mV
170 170
IL = 200 mA 180 230 230
350 350
IGND
Ground Pin Current
IL = 100 µA
IL = 75 mA
120 120
100
150 150
µA
800 800
500
1400
1400
IL = 200 mA 1 2.1 2.1
3.7 3.7
VS/D < 0.3V
0.05
1.5
1.5
IO(PK)
Peak Output Current
VOUT ≥ VO(NOM) − 5%
400
250
250
IO(MAX)
Short Circuit Current
RL = 0 (Steady State)
(Note 10)
400
mA
µA
mA
en
LP2987 Output Noise
BW = 300 Hz to
Voltage (RMS)
50 kHz, VOUT = 3.3V
100
COUT = 10 µF
LP2988 Output Noise
BW = 300 Hz to
Voltage (RMS)
50 kHz, VOUT = 3.3V
COUT = 10 µF
CBYPASS = .01 µF
20
Ripple Rejection
f = 1 kHz, COUT = 10 µF
CBYP = 0 (LP2988)
65
µV(RMS)
dB
Output Voltage
(Note 9)
Temperature Coefficient
20
ppm/˚C
www.national.com
6
6 Page 
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 2.2 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA. (Continued)
Delay Sink Current
vs Temperature
Delay Sink Current vs Temperature
Output Impedance vs Frequency
DS100017-47
Output Impedance vs Frequency
DS100017-46
Ripple Rejection (LP2987)
DS100017-40
Ripple Rejection (LP2988)
DS100017-41
www.national.com
DS100017-42
12
DS100017-51
12 Page | ||
| Seiten | Gesamt 19 Seiten | |
| PDF Download | [ LP2987IM-3.8 Schematic.PDF ] | |
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| Teilenummer | Beschreibung | Hersteller |
| LP2987IM-3.0 | Micropower/ 200 mA Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988) | National Semiconductor |
| LP2987IM-3.0 | Micropower/ 200 mA Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988) | National Semiconductor |
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| LP2987IM-3.3 | Micropower/ 200 mA Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988) | National Semiconductor |
| LP2987IM-3.8 | Micropower/ 200 mA Ultra Low-Dropout Voltage Regulator with Programmable Power-On Reset Delay; Low Noise Version Available (LP2988) | National Semiconductor |
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