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PDF LD7282A Datasheet ( Hoja de datos )

Número de pieza LD7282A
Descripción VFM Step-Up DC/DC Converter
Fabricantes Leadtrend 
Logotipo Leadtrend Logotipo

Total 8 Páginas
		
LD7282A Hoja de datos, Descripción, Manual
LD7282A
5/10/2006
VFM STEP-UP DC/DC CONVERTER
REV: 01
General Description
The LD7282A is a VFM step-up DC/DC converter with ultra
low supply current. The CMOS design results in less power
consumption and high capability for battery-powered
instruments.
With a built-in switching MOSFET, the LD7280 takes only
three external components (using a coil, diode & capacitor
connected externally) to achieve the low ripple & high
efficiency.
As well, using chip enable function will make it possible to
supply current on standby minimized. This converter also
features a very low switch off, bias current of 5.0µA typical.
Features
Minimum external component counts
Ultra low input current in switch off (Typ. 5µA)
±2% High accuracy of output voltage
Low ripple and low noise
Low start-up voltage, 0.75V at no load.
85% efficiency with low cost inductor
Applications
Power source for battery -powered equipment
Power source for DSC, PDA, Camcorders, VCRs,
Pagers, and Hand-held communication equipment
Typical Application
47µH
VIN
L
D1
5817SL
LX VOUT
NC
CE GND
VOUT
COUT
22µF
L range: 10µH~120µH
LD7282A
Fig. 1
Leadtrend Technology Corporation
LD7282A-DS-01 May, 2006
1

1 page

LD7282A pdf
LD7282A
Typical Performance Characteristics
(L=47µH, COUT=22µF, VOUT=3.8V)
4.5
4.0
3.5
VIN=1.0V
3.0
2.5
2.0
1.5
VIN=3.0V
VIN=2.5V
VIN=2.0V
VIN=1.5V
1.0
0.5
0.0
0 20 40 60 80 100
Output Current (mA)
Fig. 2 Output voltage vs. Output Current
1.6
1.4
1.2
1.0 VSTART
0.8
0.6 VHOLD
0.4
0.2
0.0
0 5 10 15 20
Output Current (mA)
Fig. 4 Start-up/Hold-on Voltage vs. Output Current
100
80
60 VIN=1.0V
40
20
VIN=3.0V
VIN=2.5V
VIN=2.0V
VIN=1.5V
0
0 20 40 60 80 100
Output Current (mA)
Fig. 3 Efficiency vs. Output Current
4.0
3.9
3.8
3.7
3.6
VIN=3V
IOUT=10mA
3.5
0
20 40 60 80
Temperature (°C )
Fig. 5 Output Voltage vs. Temperature
100
Leadtrend Technology Corporation
LD7282A-DS-01 May 2006
5

5 Page



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