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PDF LD49300 Data sheet ( Hoja de datos )
| Número de pieza | LD49300 | |
| Descripción | 3A Very low drop | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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LD49300
3A Very low drop for low output voltage regulator
Feature summary
■ Input voltage range:
VI = 1.4V to 5.5V
VBIAS = 3V to 6V
■ Stable with ceramic capacitor
■ ±1.5% initial tolerance
■ Maximum dropout voltage (VI - VO) of 400mV
over temperature
■ Adjustable output voltage down to 0.8V
■ Ultra fast transient response (up to 10MHz
bandwidth)
■ Excellent line and load regulation
specifications
■ Logic controlled shutdown option
■ Thermal shutdown and current limit protection
■ Junction temperature range: –25°C to 125°C
Description
The LD49300 is a high-bandwidth, low-dropout,
3.0A voltage regulator, ideal for powering core
voltages of low-power microprocessors. The
LD49300 implements a dual supply configuration
allowing for very low output impedance and very
fast transient response. The LD49300 requires a
bias input supply and a main input supply,
allowing for ultra-low input voltages on the main
supply rail. The input supply operates from 1.4V to
PPAK
5.5V and the bias supply requires between 3V
and 6V for proper operation. The LD49300 offers
fixed output voltages from 0.8V to 1.8V and
adjustable output voltages down to 0.8V.
The LD49300 requires a minimum output
capacitance for stability, and work optimally with
small ceramic capacitors.
Applications
■ Graphics processors
■ PC Add-In Cards
■ Microprocessor core voltage supply
■ Low voltage digital ICs
■ High Efficiency Linear power supplies
■ SMPS post regulators
Order code
Part number
LD49300PT08R (1)
LD49300PT10R
LD49300PT12R
1. Adjustable Version.
December 2006
Package
PPAK (Tape&Reel)
PPAK (Tape&Reel)
PPAK (Tape&Reel)
Rev. 2
Packaging
2500 parts per reel
2500 parts per reel
2500 parts per reel
1/20
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1 page  
LD49300
3 Pin configuration
Figure 5. Pin connections (top view)
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Pin configuration
Table 1.
Pln n°
1
2
3
4
5
Pin description
Symbol
EN
ADJ
VIN
GND
VOUT
VBIAS
Note
Enable (Input): Logic High = Enable, Logic Low = Shutdown.
Adjustable regulator feedback input. Connect to resistor voltage divider.
Input voltage which supplies current to the output power device.
Ground (TAB is connected to ground).
Regulator output.
Input bias voltage for powering all circuitry on the regulator with the exception of the output
power device.
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LD49300
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Typical characteristics
Figure 19. Stability region vs COUT & Low ESR Figure 20. VBIAS Start Up transient (VIN Start
Up before VBIAS)
VIN=2V, VINH=VBIAS, IOUT=3A, VOUT=1V, CIN=COUT=1µF
Figure 21. VBIAS & VIN Start Up transient
Figure 22. VIN Start Up transient response
response (VIN and VBIAS Start Up at
(VBIAS Start Up before VIN)
the same time)
VIN=VBIAS=VINH=3.1V, VOUT=1V, COUT=1µF
VIN=2.5V, VBIAS=VINH=3.1V, VOUT=1V, COUT=1µF
11/20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LD49300.PDF ] | |
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