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PDF GM7620 Data sheet ( Hoja de datos )
| Número de pieza | GM7620 | |
| Descripción | Fixed Frequency Step-up Dc-to-dc Converter | |
| Fabricantes | Gamma Microelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de GM7620 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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PRELIMINARY
GM7620
FIXED FREQUENCY STEP-UP DC/DC CONVERTER
www.DataSheet4U.com
1.2MHz Fixed Frequency Switching
Inherently Matched LED Current
Adjustable Control of LED Current
Drives Five White LEDs from 2V
Drives Six White LEDs from 2.7V
Drives Eight White LEDs from 3V
Disconnects LEDs In Shutdown
Uses Tiny Ceramic Capacitors
Uses Tiny 1mm-Tall Inductors
Regulates Current Even When VIN > VOUT
Operates with VIN as Low as 1V
Up to 80% Efficiency
Applications:
Handheld Computers
Cellular Telephones
Digital Cameras
Portable MP3 Players
The GM7620 is a fixed frequency step-up DC/DC
converter designed to operate as a constant-current
source. Because it directly regulates output current,
the GM7620 is ideal for driving light emitting diodes
(LEDs) whose light intensity is proportional to the
current passing through them, not the voltage across
their terminals.
With an input voltage range of 1V to 10V, the device
works from a variety of input sources. The GM7620
accurately regulates LED current even when the input
voltage is higher than the LED voltage, greatly
simplifying batterypowered designs. A single external
resistor sets LED current between 5mA and 40mA,
which can then be easily adjusted using either a DC
voltage or a pulse width modulated (PWM) signal.
When the GM7620 is placed in shutdown, the LEDs
are disconnected from the output, ensuring a quiescent
current of under 1mA for the entire circuit. The device’s
1.2MHz switching frequency permits the use of tiny,
low profile chip inductors and capacitors to minimize
footprint and cost in space-conscious portable
applications.
The GM7620 is available in 6-lead plastic SOT-23
package.
VIN
2.7V to 4.2V
C1
4.7µF
TYPICAL APPLICATION (Li-ION Driver for 4 White LEDs)
L1
6.8µH
D1
PWM
DIMMING
CONTROL
61
VIN SW
GM7620
5
SHDN
LED 3
RSET
4
RSET
1.5k
GND
2
15mA
C2
1µF
Revision 1, December 2002
1
www.gammamicro.com
1 page  
PRELIMINARY
GM7620
FIXED FREQUENCY STEP-UP DC/DC CONVERTER
SOT-23-6 PACKAGE OUTLINE DIMENSIONS
www.DataSheet4U.com
Revision 1, December 2002
SYMBOL
A
A1
A2
b
C
D
E
e
H
L
e1
θ1
NOTES:
1. PACKAGE BODY SIZES EXCLUDE
MOLD FLASH AND GATE BURRS
2. DIMENSION L IS MEASURED IN
GAGE PLANE
3. TOLERANCE 0.10 mm
UNLESS OTHERWISE SPECIFIED
4. COPLANARITY: 0.10 mm
MIN
1.00
0
0.70
0.35
0.10
2.70
1.40
2.60
0.37
1°
Dimensions In Millimeters
NOM
1.10
-
0.80
0.40
0.15
2.90
1.60
1.90 TYP.
2.80
-
0.95 TYP.
5°
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
3.00
-
9°
5 www.gammamicro.com
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| PDF Descargar | [ Datasheet GM7620.PDF ] | |
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