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PDF APW7208 Data sheet ( Hoja de datos )
| Número de pieza | APW7208 | |
| Descripción | Step-Up Converter for 2 to 6 White LEDs | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APW7208
1MHz, High-Efficiency, Step-Up Converter for 2 to 6 White LEDs
Features
General Description
• Wide Input Voltage from 2.5V to 6V
• 104mV Reference Voltage
• Fixed 1MHz Switching Frequency
• High Efficiency up to 88%
• 100Hz to 100kHz PWM Brightness Control Fre-
quency
• Open-LED Protection
• Under-Voltage Lockout Protection
• Over-Temperature Protection
• <1µA Quiescent Current During Shutdown
• SOT-23-6 Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• White LED Display Backlighting
• Cell Phone and Smart Phone
• PDA, PMP, and MP3
• Digital Camera
Simplified Application Circuit
The APW7208 is a current-mode and fixed frequency
boost converter with an integrated N-FET to drive up to 6
white LEDs in series.
The series connection allows the LED current to be iden-
tical for uniform brightness. Its low on-resistance of N-
FET and feedback voltage reduces power loss and
achieves high efficiency. Fast 1MHz current-mode PWM
operation is available for input and output capacitors and
a small inductor while minimizing ripple on the input
supply. The OVP pin monitors the output voltage and stops
switching if exceeds the over-voltage threshold. An inter-
nal soft-start circuit eliminates the inrush current during
start-up.
The APW7208 also integrates under-voltage lockout,
over-temperature protection and current limit circuits.
The APW7208 is available in a SOT-23-6 package.
Pin Configuration
LX 1
GND 2
FB 3
6 VIN
5 OVP
4 EN
SOT-23-6
(Top View)
VIN
C1
2.2µF
OFF ON
L1
22µH
6 VIN
LX 1
2
GND
OVP 5
4
EN
FB 3
VOUT
C2
1µF Up to 6
WLEDs
R1
5.1Ω
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Aug., 2009
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APW7208
Operating Waveforms
(Refer to the application circuit in the section “Typical Application Circuits”, VIN=3.6V, TA=25oC, 6WLEDs unless otherwise
specified)
Start-up
Start-up
VEN
VIN
VOUT
VEN
VIN
VOUT
IIN, 0.1A/Div
6WLEDs, L=22µH, VIN=3.6V, ILED=20mA
IIN, 0.1A/Div
4WLEDs, L=22µH, VIN=3.6V, ILED=20mA
Open-LED Protection
VOUT, 10V/Div
Normal Operating Waveform
VLX, 20V/Div, DC
VOUT, 50mV/Div, AC
IL, 0.1A/Div
6WLEDs, L=22µH, VIN=3.6V, ILED=20mA
µ
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Aug., 2009
5
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APW7208
Package Information
SOT-23-6
D
e
SEE
VIEW A
b
e1
c
L
VIEW A
GAUGE PLANE
SEATING PLANE
S SOT-23-6
Y
M
B
MILLIMETERS
INCHES
O
L
MIN.
MAX.
MIN.
MAX.
A 1.45
0.057
A1 0.00
A2 0.90
b 0.30
0.15
1.30
0.50
0.000
0.035
0.012
0.006
0.051
0.020
c 0.08
0.22
0.003
0.009
D 2.70
3.10
E 2.60
3.00
E1 1.40
1.80
e 0.95 BSC
e1 1.90 BSC
L 0.30
0.60
0 0°
8°
0.106
0.122
0.102
0.118
0.055
0.071
0.037 BSC
0.075 BSC
0.012
0.024
0° 8°
Note : 1. Follow JEDEC TO-178 AB.
2. Dimension D and E1 do not include mold flash, protrusions or
gate burrs. Mold flash, protrusion or gate burrs shall not exceed
10 mil per side.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Aug., 2009
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet APW7208.PDF ] | |
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