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PDF LP8345IDTX-1.8 Data sheet ( Hoja de datos )
| Número de pieza | LP8345IDTX-1.8 | |
| Descripción | Low Dropout/ Low IQ/ 500mA CMOS Linear Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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October 2003
LP8345
Low Dropout, Low IQ, 500mA CMOS Linear Regulator
General Description
The LP8345 low-dropout CMOS linear regulator are avail-
able in 5V, 3.3V, 2.5V, 1.8V or adjustable output versions.
Packaged in our 6ld LLP package and 3ld DPAK they can
deliver up to 500mA output current.
Typical dropout voltage @ 500mA is 210mV for the 5.0V
version, 270mV for the 3.3V version and 335mV for the 2.5V
version.
The devices include a zener trimmed bandgap voltage ref-
erence, foldback current limiting and thermal overload limit-
ing.
The LP8345 features a PMOS output transistor which unlike
PNP type low dropout regulators requires no base drive
current. This allows the device ground current to remain less
than 50µA over operating temperature, supply voltage and
irrespective of the load current.
Features
n ±1.5% Typical VOUT tolerance
n 210mV Typical Dropout @ 500mA (VO = 5V)
n Wide Operating Range
2.7V to 10V
n Internal 500mA PMOS Output Transistor
n 19µA Typical Quiescent Current
n Thermal Overload Limiting
n Foldback Current Limiting
n Zener Trimmed Bandgap Reference
n Space saving LLP package
n Temperature Range
— LP8345C
— LP8345I
0˚C to 125˚C
−40˚C to 125˚C
Applications
n Hard Disk Drives
n Notebook Computers
n Battery Powered Electronics
n Portable Instrumentation
Typical Applications
Fixed VOUT
Adjustable VOUT
20064801
© 2003 National Semiconductor Corporation DS200648
20064802
www.national.com
1 page  
LP8345C Electrical Characteristics (Continued)
Unless otherwise specified all limits guaranteed for VIN = VO+ 1V, CIN = COUT = 10µF, TJ = 25˚C. Boldface limits apply over
the full operating temperature range of TJ = 0˚C to 125˚C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
ILIMIT
TSD
Foldback Current Limit
Ripple Rejection Ratio
Thermal Shutdown
Temp.
VIN − VOUT >5V
VIN − VOUT <4V
VIN (dc) = VOUT + 2V
VIN (ac) = 1VP-P @ 120Hz
(Note 5)
48
(Note 4)
450
1200
55
(Note 5)
mA
dB
160 ˚C
Thermal Shutdown Hyst.
10
ADJ Input Leakage
Current
VADJ = 1.5V or 0V
±0.01 ±100
nA
VOUT Leakage Current LP8345-ADJ
ADJ = OUT, VOUT = 2V, VIN = 10V
LP8345-1.8, VOUT = 2.5V, VIN = 10V
LP8345-2.5, VOUT = 3.5V, VIN = 10V
LP8345-3.3, VOUT = 4V, VIN = 10V
LP8345-5.0, VOUT = 6V, VIN = 10V
en Output Noise
10Hz to 10kHz, RL = 1kΩ, COUT = 10µF
10
10
µA
10
10
10
250 µVrms
LP8345I Electrical Characteristics
Unless otherwise specified all limits guaranteed for VIN = VO+ 1V, CIN = COUT = 10µF, TJ = 25˚C. Boldface limits apply over
the full operating temperature range of TJ = −40˚C to 125˚C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(Note 5) (Note 4) (Note 5)
VIN Input Voltage
LP8345-ADJ,1.8, 2.5
LP8345-3.3, 5.0
2.7 10
V
10
VOUT
Output Voltage
LP8345-ADJ, ADJ = OUT
IOUT = 10mA, VIN = 2.7V, TJ = 25˚C
100µA ≤IOUT≤ 500mA, 2.7V ≤VIN≤VOUT +4V
LP8345-1.8
1.231
1.213
1.250
1.269
1.288
V
IOUT = 10mA, VIN = 2.8V, TJ = 25˚C
100µA ≤IOUT ≤500mA, 2.8V ≤VIN≤6V
LP8345-2.5
1.773
1.746
1.800
1.827
1.854
V
IOUT = 10mA, VIN = 3.5V, TJ = 25˚C
100µA ≤IOUT ≤500mA, 3.5V ≤VIN ≤6.5V
LP8345-3.3
2.463
2.425
2.500
2.538
2.575
V
IOUT = 10mA, VIN = 4.3V TJ = 25˚C
100µA ≤IOUT ≤500mA, 4.3V ≤VIN ≤7.5V
LP8345-5.0
3.250
3.201
3.300
3.350
3.399
V
∆VO Load Regulation
IOUT = 10mA, VIN = 6V, TJ = 25˚C
100µA ≤IOUT ≤500mA, 6V ≤VIN ≤9V
LP8345-ADJ, ADJ=OUT
IOUT = 1mA to 500mA, VIN = 2.7V
LP8345-1.8
4.925
4.850
5.000
6
5.075
5.150
20
V
IOUT = 1mA to 500mA, VIN = 2.8V
LP8345-2.5
IOUT = 1mA to 500mA, VIN = 3.5V
LP8345-3.3
7 20
mV
9 30
IOUT = 1mA to 500mA, VIN = 4.3V
LP8345-5.0
12 35
IOUT = 1mA to 500mA, VIN = 6V
14 40
5 www.national.com
5 Page 
Applications Section (Continued)
START UP CONSIDERATIONS
Under certain operating conditions, overshoot of VOUT at
start-up can occur. The observed overshoot is a function of
rise time of VIN waveform, COUT, start-up load current, and
VIN−VOUT differential. The relationship between these con-
ditions is shown in the Typical Performance Characteristics
curves (Minimum Input Voltage Rise Time). VIN rise times
above the curve result in <5% overshoot.
Customers are encouraged to check the suitability of
LP8345 in their specific application.
11 www.national.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LP8345IDTX-1.8.PDF ] | |
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