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PDF LP3990MFX-1.8 Data sheet ( Hoja de datos )
| Número de pieza | LP3990MFX-1.8 | |
| Descripción | 150mA Linear Voltage Regulator for Digital Applications | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LP3990MFX-1.8 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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November 2004
LP3990
150mA Linear Voltage Regulator for Digital Applications
General Description
The LP3990 regulator is designed to meet the requirements
of portable, battery-powered systems providing an accurate
output voltage, low noise, and low quiescent current. The
LP3990 will provide a 0.8V output from the low input voltage
of 2V at up to 150mA load current. When switched into
shutdown mode via a logic signal at the enable pin, the
power consumption is reduced to virtually zero.
The LP3990 is designed to be stable with space saving
ceramic capacitors as small as 0.47µF.
Performance is specified for a -40˚C to 125˚C junction tem-
perature range.
For output voltages other than 0.8V, 1.35V, 1.5V, 1.8V, 2.5V,
2.8V, or 3.3V please contact your local NSC sales office.
Features
n 1% Voltage Accuracy at Room Temperature
n Stable with Ceramic Capacitor
n Logic Controlled Enable
n No Noise Bypass Capacitor Required
n Thermal-Overload and Short-Circuit Protection
Key Specifications
n Input Voltage Range
n Output Voltage Range
n Output Current
n Output Stable - Capacitors
n Virtually Zero IQ (Disabled)
n Very Low IQ (Enabled)
n Low Output Noise
n PSRR
n Fast Start Up
2.0 to 6.0V
0.8 to 3.3V
150mA
0.47uF
<10nA
43uA
150uVRMS
55dB at 1kHz
105us
Package
All available in Lead Free option.
4 Pin micro SMD
1 mm x 1.28mm
6 pin LLP (SOT23 footprint)
SOT23 - 5
For other package options contact your NSC sales office.
Applications
n Cellular Handsets
n Hand-Held Information Appliances
Typical Application Circuit
© 2004 National Semiconductor Corporation DS200768
20076801
www.national.com
1 page  
Absolute Maximum Ratings
(Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
Output Voltage
Enable Input Voltage
Junction Temperature
Lead/Pad Temp. (Note 3)
LLP/SOT23
micro SMD
Storage Temperature
Continuous Power Dissipation
Internally Limited(Note 4)
-0.3 to 6.5V
-0.3 to (VIN + 0.3V) to
6.5V (max)
-0.3 to (VIN + 0.3V) to
6.5V (max)
150˚C
235˚C
260˚C
-65 to 150˚C
ESD (Note 5)
Human Body Model
Machine Model
2KV
200V
Operating Ratings(Note 1)
Input Voltage
Enable Input Voltage
Junction Temperature
Ambient Temperature TARange
(Note 6)
2V to 6V
0 to (VIN + 0.3V) to
6.0V (max)
-40˚C to 125˚C
-40˚C to 85˚C
Thermal Properties(Note 1)
Junction To Ambient Thermal
Resistance(Note 8)
θJA(LLP-6)
θJA(microSMD)
θJASOT23-5
88˚C/W
220˚C/W
220˚C/W
Electrical Characteristics
Unless otherwise noted, VEN =950mV, VIN = VOUT + 1.0V, or 2.0V, whichever is higher. CIN = 1 µF, IOUT = 1 mA, COUT =0.47
µF. Typical values and limits appearing in normal type apply for TJ = 27˚C. Limits appearing in boldface type apply over the
full junction temperature range for operation, −40 to +125˚C. (Note 13)
Symbol
Parameter
Conditions
Limit
Typ Units
Min Max
VIN
∆VOUT
Input Voltage
Output Voltage Tolerance
(Note 14)
ILOAD = 1 mA
Over full line
and load
regulation.
Micro SMD
LLP
Micro SMD
LLP
26
-1 +1
-1.5 +1.5
-2.5 +2.5
-3 +3
V
%
Line Regulation Error
Load Regulation Error
VIN = (VOUT(NOM) + 1.0V) to 6.0V,
IOUT = 1mA
VOUT = 0.8 to 1.95V
to 150mA
MicroSMD
0.02
0.002
-0.1
-0.005
0.1
0.005
%/V
VOUT = 0.8 to 1.95V
LLP, SOT-23
VOUT = 2.0 to 3.3V
MicroSMD
0.003
0.0005
-0.008
-0.002
0.008
0.002
%/mA
VOUT = 2.0 to 3.3V
LLP, SOT-23
0.002 -0.005 0.005
VDO Dropout Voltage
IOUT = 150mA
(Note 7)
120
mV
ILOAD
IQ
ISC
IOUT
PSRR
Load Current
Quiescent Current
Short Circuit Current Limit
Maximum Output Current
Power Supply Rejection Ratio
(Notes 9, 10)
VEN = 950mV, IOUT = 0mA
VEN = 950mV, IOUT = 150mA
VEN = 0.4V
(Note 11)
f = 1kHz, IOUT = 1mA to 150mA
f = 10kHz, IOUT = 150mA
0
43 80
65 120
0.002
0.2
550 1000
150
55
35
µA
µA
mA
mA
dB
5 www.national.com
5 Page 
Application Hints (Continued)
tantalum will increase about 2:1 as the temperature goes
from 25˚C down to -40˚C, so some guard band must be
allowed.
ENABLE CONTROL
The LP3990 features an active high Enable pin, VEN, which
turns the device on when pulled high. When not enabled the
regulator output is off and the device typically consumes
2nA.
If the application does not require the Enable switching
feature, the VEN pin should be tied to VIN to keep the
regulator output permanently on.
To ensure proper operation, the signal source used to drive
the VEN input must be able to swing above and below the
specified turn-on/off voltage thresholds listed in the Electrical
Characteristics section under VIL and VIH.
Micro SMD MOUNTING
The micro SMD package requires specific mounting tech-
niques, which are detailed in National Semiconductor Appli-
cation Note AN-1112.
For best results during assembly, alignment ordinals on the
PC board may be used to facilitate placement of the micro
SMD device.
Micro SMD LIGHT SENSITIVITY
Exposing the micro SMD device to direct light may affect the
operation of the device. Light sources, such as halogen
lamps, can affect electrical performance, if placed in close
proximity to the device.
Light with wavelengths in the infra-red portion of the spec-
trum is the most detrimental, and so, fluorescent lighting
used inside most buildings, has little or no effect on perfor-
mance.
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LP3990MFX-1.8.PDF ] | |
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