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PDF FP6773 Data sheet ( Hoja de datos )
| Número de pieza | FP6773 | |
| Descripción | 1A Buck/Boost Charge Pump LED Driver | |
| Fabricantes | Fiti | |
| Logotipo |  |
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fitipower integrated technology lnc.
FP6773
1A Buck/Bo8o5sTt
Charge Pump LED Driver
Description
The FP6773 Buck/Boost charge pump LED driver is
designed for powering high brightness white LEDs
for camera flash applications. The FP6773
automatically switches modes between step-up and
step-down ensuring that LED current does not
depend on the forward voltage. The FP6773
provides two current levels for TORCH and FLASH
modes. In TORCH mode, the current sense
reference voltage is 50mV. The LED current can be
determined by current sense resistor. In Flash
mode, the current sense reference voltage can be
adjusted by external resistor. The maximum LED
current can be set up to 1A. The FP6773 is
available in a space saving TDFN-10 3mm×3mm
package.
Features
●Output Current up to 1A
● Up to 94% Efficiency in Torch Mode
● Adjustable FLASH Mode Current
● Minimum External Components: No Inductors
● Automatic Buck/Boost Mode Switchover
● Wide VIN Range: 2.7V to 5.5V
● High Frequency Operation: 2MHz
● 50mV Reference for Low Loss Sensing
● IQ < 1μA in Shutdown
● PWM Dimming Control
● Automatic Soft Start Limits Inrush Current
● Over-Voltage Protection on Output
● Over-Current Protection
● Over-Temperature Protection
● Low Ripple and EMI
● Ultra-Low Dropout Voltage in Buck Mode
● 1.6 Second Timeout in Flash Mode
● Space Saving 10-Pin DFN 3mm×3mm package
Applications
● White LED Torch/Flash for Mobile Phones, DSCs,
and Camcorders
● Generic Lighting/Flash/Strobe Applications
● General Purpose High Current Boost
Pin Assignment
WD Package TDFN-10 (3mmX3mm)
VIN 1
C1 2
C2 3
FLASH 4
EN 5
10 VOUT
9 PGND
8 SGND
7 FB
6 RSET
Figure 1. Pin Assignment of FP6773 (Top View)
Ordering Information
FP6773□□□
TR: Tape / Real
Blank: Tube
G: Green
Package Type
WD: TDFN-10(3mmX3mm)
FP6773-1.2-MAY-2011
1
http://www.Datasheet4U.com
1 page  
fitipower integrated technology lnc.
Typical Performance Curves
FP6773
85T
200
3V
3.6V
4.2V
150
100
50
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature(oC)
Figure 4. Torch Mode Output Current vs. Temperature
(CIN=1μF, CFC=1μF, COUT=1μF)
100
90 Torch
Flash
80
70
60
50
40
30
20
10
0
3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 4.1 4.2
Input Voltage (Volt)
Figure 6. Efficiency vs. Input Voltage
(200mA Torch, 300mA Flash, VF=4.0V)
800
750 3.6V
700
650
600
550
500
450
400
350
300
250
200
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
Temperature (oC)
Figure 5. Flash Mode Output Current vs. Temperature
(CIN=1μF, CFC=1μF, COUT=1μF)
1500
1400 Measured
1300 Calculated
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
RSET (Kohm)
Figure 7. VFB vs. RSET
VIN
VOUT
VIN
VOUT
VFB
IOUT
VFB
IOUT
Figure 8. Torch in 1X to Flash in 2X Mode, VIN=3V
FP6773-1.2-MAY-2011
Figure 9. Torch in 1X to Flash in 2X Mode, VIN=3.6V
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet FP6773.PDF ] | |
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