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LP2989AIM-2.5 데이터시트 PDF
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PDF 형식의 LP2989AIM-2.5 자료 제공
| 부품번호 | LP2989AIM-2.5 기능 |
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| 기능 | Micropower/Low Noise/ 500 mA Ultra Low-Dropout Regulator For Use with Ceramic Output Capacitors | ||
| 제조업체 | National Semiconductor | ||
| 로고 |  |
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전체 12 페이지수
March 2000
LP2989
Micropower/Low Noise, 500 mA Ultra Low-Dropout
Regulator
For Use with Ceramic Output Capacitors
General Description
The LP2989 is a fixed-output 500 mA precision LDO regula-
tor designed for use with ceramic output capacitors.
Output noise can be reduced to 18µV (typical) by connecting
an external 10 nF capacitor to the bypass pin.
Using an optimized VIP™ (Vertically Integrated PNP) pro-
cess, the LP2989 delivers superior performance:
Dropout Voltage: Typically 310 mV @ 500 mA load, and 1
mV @ 100 µA load.
Ground Pin Current: Typically 3 mA @ 500 mA load, and
110 µA @ 100 µA load.
Sleep Mode: The LP2989 draws less than 0.8 µA quiescent
current when shutdown pin is pulled low.
Error Flag: The built-in error flag goes low when the output
drops approximately 5% below nominal.
Precision Output: Guaranteed output voltage accuracy is
0.75% (“A” grade) and 1.25% (standard grade) at room tem-
perature.
Features
n Ultra low dropout voltage
n Guaranteed 500 mA continuous output current
n Very low output noise with external capacitor
n SO-8 surface mount package
n <0.8 µA quiescent current when shutdown
n Low ground pin current at all loads
n 0.75% output voltage accuracy (“A” grade)
n High peak current capability (800 mA typical)
n Wide supply voltage range (16V max)
n Overtemperature/overcurrent protection
n −40˚C to +125˚C junction temperature range
Applications
n Notebook/Desktop PC
n PDA/Palmtop Computer
n Wireless Communication Terminals
n SMPS Post-Regulator
Block Diagram
VIP™ is a trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101339
DS101339-1
www.national.com
 
Electrical Characteristics (Continued)
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 = 1 µF, VS/D = 2V.
Symbol
Parameter
Conditions
Typical
LP2989AI-X.X
(Note 6)
Min Max
LP2989I-X.X
(Note 6)
Min Max
Units
Output Voltage
(Note 8)
Temperature Coefficient
20
ppm/˚C
SHUTDOWN INPUT
VS/D
S/D Input Voltage
IS/D S/D Input Current
ERROR COMPARATOR
IOH Output “HIGH” Leakage
VH = O/P ON
VL = O/P OFF
IIN ≤ 2 µA
VS/D = 0
VS/D = 5V
VOH = 16V
VOL
VTHR
(MAX)
VTHR
(MIN)
HYST
Output “LOW” Voltage
Upper Threshold
Voltage
Lower Threshold
Voltage
Hysteresis
VIN = VO(NOM) − 0.5V,
IO(COMP) = 150 µA
1.4
0.50
0.001
5
0.001
150
−4.8
−6.6
2.0
1.6
−6.0
−8.3
−8.9
−13.0
0.18
−1
15
1
2
220
350
−3.5
−2.5
−4.9
−3.0
1.6
−6.0
−8.3
−8.9
−13.0
0.18
−1
15
1
2
220
350
−3.5
−2.5
−4.9
−3.0
V
µA
µA
mV
%VOUT
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice outside of its rated operating conditions.
Note 2: ESD testing was performed using Human Body Model, a 100 pF capacitor discharged through a 1.5 kΩ resistor.
Note 3: The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal resistance, θJ−A,
and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of θJ−A for the SO-8 (M) package is 160˚C. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator
will go into thermal shutdown.
Note 4: If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2989 output must be diode-clamped to ground.
Note 5: The output PNP structure contains a diode between the VIN and VOUT terminals that is normally reverse-biased. Forcing the output above the input will turn
on this diode and may induce a latch-up mode which can damage the part (see Application Hints).
Note 6: Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 7: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.
Note 8: Temperature coefficient is defined as the maximum (worst-case) change divided by the total temperature range.
Note 9: See Typical Performance Characteristics curves.
www.national.com
4
4페이지 
Typical Performance Characteristics Unless otherwise specified: TA = 25˚C, COUT = 4.7 µF,
CIN = 1 µF, S/D is tied to VIN, VIN = VO(NOM) + 1V, IL = 1 mA, VOUT = 2.5V. (Continued)
Dropout Voltage vs Load Current
Dropout Voltage vs Temperature
Dropout Characteristics
DS101339-19
DS101339-20
Ground Pin Current vs Load Current
GND Pin Current vs
Temperature and Load
DS101339-21
VOUT vs Shutdown
DS101339-22
DS101339-23
7
DS101339-24
www.national.com
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관련 데이터시트
| 부품번호 | 상세설명 및 기능 | 제조사 |
| LP2989AIM-2.5 | Micropower/Low Noise/ 500 mA Ultra Low-Dropout Regulator For Use with Ceramic Output Capacitors | National Semiconductor |
| LP2989AIM-2.5 | Micropower/Low Noise/ 500 mA Ultra Low-Dropout Regulator For Use with Ceramic Output Capacitors | National Semiconductor |
| DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |