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PDF LP3985IBL-2.5 Data sheet ( Hoja de datos )
| Número de pieza | LP3985IBL-2.5 | |
| Descripción | Micropower/ 150mA Low-Noise Ultra Low-Dropout CMOS Voltage Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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June 2003
LP3985
Micropower, 150mA Low-Noise Ultra Low-Dropout CMOS
Voltage Regulator
General Description
The LP3985 is designed for portable and wireless applica-
tions with demanding performance and space requirements.
The LP3985 is stable with a small 1µF ±30% ceramic or
high-quality tantalum output capacitor. The micro SMD re-
quires the smallest possible PC board area - the total appli-
cation circuit area can be less than 2.0mm x 2.5mm, a
fraction of a 1206 case size.
The LP3985’s performance is optimized for battery powered
systems to deliver ultra low noise, extremely low dropout
voltage and low quiescent current. Regulator ground current
increases only slightly in dropout, further prolonging the
battery life.
An optional external bypass capacitor reduces the output
noise without slowing down the load transient response.
Fast start-up time is achieved by utilizing an internal
power-on circuit that actively pre-charges the bypass capaci-
tor.
Power supply rejection is better than 50 dB at low frequen-
cies and starts to roll off at 1kHz. High power supply rejection
is maintained down to low input voltage levels common to
battery operated circuits.
The device is ideal for mobile phone and similar battery
powered wireless applications. It provides up to 150 mA,
from a 2.5V to 6V input. The LP3985 consumes less than
1.5µA in disable mode and has fast turn-on time less than
200µs.
The LP3985 is available in a 5 bump small bump micro SMD,
a 5 bump large bump micro SMD, a 5 bump thin micro SMD
and a 5 pin SOT-23 package. Performance is specified for
−40˚C to +125˚C temperature range and is available in 2.5V,
2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V. 3.1V, 3.2V, 3.3V, 4.7V,
4.8V and 5.0V output voltages. For other output voltage
options between 2.5V to 5.0V or for a dual LP3985, please
contact National Semiconductor sales office.
Key Specifications
n 2.5 to 6.0V input range
n 150mA guaranteed output
n 50dB PSRR at 1kHz @ VIN = VOUT + 0.2V
n ≤1.5µA quiescent current when shut down
n Fast Turn-On time: 200 µs (typ.)
n 100mV maximum dropout with 150mA load
n 30µVrms output noise (typ) over 10Hz to 100kHz
n −40 to +125˚C junction temperature range for operation
n 2.5V, 2.6V, 2.7V, 2.8V, 2.85V, 2.9V, 3.0V, 3.1V, 3.2V,
3.3V, 4.7V, 4.8V and 5.0V outputs standard
Features
n Miniature 5-I/O micro SMD and SOT-23-5 package
n Logic controlled enable
n Stable with ceramic and high quality tantalum capacitors
n Fast turn-on
n Thermal shutdown and short-circuit current limit
Applications
n CDMA cellular handsets
n Wideband CDMA cellular handsets
n GSM cellular handsets
n Portable information appliances
Typical Application Circuit
Note: Pin Numbers in parenthesis indicate micro SMD package.
* Optional Noise Reduction Capacitor.
10136402
© 2003 National Semiconductor Corporation DS101364
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.
VIN, VEN
VOUT
Junction Temperature
Storage Temperature
Lead Temp.
Pad Temp. (Note 3)
Maximum Power Dissipation
SOT23-5 (Note 4)
micro SMD (Note 4)
ESD Rating(Note 5)
Human Body Model
Machine Model
−0.3 to 6.5V
-0.3 to (VIN+0.3) ≤ 6.5V
150˚C
−65˚C to +150˚C
235˚C
235˚C
364mW
355mW
2kV
150V
Operating Ratings (Notes 1, 2)
VIN
VEN
Junction Temperature
Thermal Resistance
θJA (SOT23-5)
θJA (micro SMD)
Maximum Power Dissipation
SOT23-5 (Note 6)
micro SMD (Note 6)
2.5 to 6V
0 to (VIN+0.3) ≤ 6V
−40˚C to +125˚C
220˚C/W
255˚C/W
250mW
244mW
Electrical Characteristics
Unless otherwise specified: VIN = VOUT(nom) + 0.5V, CIN = 1 µF, IOUT = 1mA, COUT = 1 µF, CBYPASS = 0.01µF. Typical values
and limits appearing in standard typeface are for TJ = 25˚C. Limits appearing in boldface type apply over the entire junction
temperature range for operation, −40˚C to +125˚C. (Note 7) (Note 8)
Symbol
Parameter
Output Voltage
Tolerance
Line Regulation Error
∆VOUT
Load Regulation Error
(Note 9)
Output AC Line Regulation
PSRR
Power Supply Rejection Ratio
IQ Quiescent Current
Dropout Voltage (Note 10)
ISC
IOUT(PK)
Short Circuit Current Limit
Peak Output Current
Conditions
IOUT = 1mA
VIN = (VOUT(nom) + 0.5V) to 6.0V,
For 4.7 to 5.0 options
For all other options
IOUT = 1 mA to 150 mA
LP3985IM5 (SOT23-5)
LP3985 (micro SMD)
VIN = VOUT(nom) + 1V,
IOUT = 150 mA (Figure 1)
VIN = VOUT(nom) + 0.2V,
f = 1 kHz,
IOUT = 50 mA (Figure 2)
VIN = VOUT(nom) + 0.2V,
f = 10 kHz,
IOUT = 50 mA (Figure 2)
VEN = 1.4V, IOUT = 0 mA
For 4.7 to 5.0 options
For all other options
VEN = 1.4V, IOUT = 0 to 150 mA
For 4.7 to 5.0 options
For all other options
VEN = 0.4V
IOUT = 1 mA
IOUT = 50 mA
IOUT = 100 mA
IOUT = 150 mA
Output Grounded
(Steady State)
VOUT ≥ VOUT(nom) - 5%
Limit
Typ Units
Min Max
−2 2 % of
−3 3 VOUT(nom)
0.0025
−0.19
−0.1
0.0004
1.5
50
0.19
0.1
0.005
0.002
%/V
%/mA
mVP-P
dB
40
100
85
155
140
0.003
0.4
20
45
60
600
550
300
165
150
250
200
1.5
2
35
70
100
µA
mV
mA
mA
5 www.national.com
5 Page 
Typical Performance Characteristics Unless otherwise specified, CIN = COUT = 1 µF Ceramic,
CBYPASS = 0.01 µF, VIN = VOUT + 0.2V, TA = 25˚C, Enable pin is tied to VIN. (Continued)
Start Up Time (VIN = VOUT + 0.2V)
Start Up Time (VIN = 4.2V)
10136418
Line Transient Response
10136419
Line Transient Response
10136420
Load Transient Response (VIN = 3.2V)
10136421
Load Transient Response (VIN = 4.2V)
10136423
10136422
11 www.national.com
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet LP3985IBL-2.5.PDF ] | |
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