|
|
PDF AIC3643 Data sheet ( Hoja de datos )
| Número de pieza | AIC3643 | |
| Descripción | Built-in OVP White LED Step-Up Converter | |
| Fabricantes | Analog Integrations | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AIC3643 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
|
No Preview Available !
AIC3643
Built-in OVP White LED Step-Up Converter
FEATURES
Built-In Open Circuit Protection
Over Voltage Protection
Efficiency Up to 83% at VIN=4.2V, 3LEDs,
ILED=20mA
1.2MHz Fixed Switching Frequency
Drives Up to 5LEDs in series
2.5V to 5.5V Input Voltage
Low Supply Current: 150μA
Matches LED Current
Requires Tiny Inductor and Capacitors
TSOT-23-6, and SOT-23-6 Packages
APPLICATIONS
Cellular Phones
PDAs
DSCs
Handheld Devices
White LED Display Backlighting
DESCRIPTION
AIC3643 is a current-mode pulse-width-
modulation (PWM), step-up DC/DC converter
designed to drive white LEDs with a constant
current to provide backlight in hand-held devices.
Series connection of LEDs provides identical
LED currents resulting in uniform brightness.
This configuration eliminates the need of ballast
resistors. The built-in open load protection
prevents the damage resulting from an open
circuit condition. Also low 100mV feedback
voltage minimizes power loss in the current
setting resistor for better efficiency.
AIC3643 is a step-up PWM converter, which
includes an internal N-channel MOSFET switch
for high efficiency. The high switching frequency,
1.2MHz, allows the use of tiny external
components.
AIC3643 is available in a space-saving TSOT-
23-6, and SOT-23-6 packages.
TYPICAL APPLICATION CIRCUIT
3.0~4.2V L D1
6.8μH
C1
1μF VIN SW
SHDN OVP
GND FB
AIC3643
L1: GTSD31-6R8M, GOTREND
D1: SS0540, PAN JIT
C1: JMK107BJ105KA, TAIYO YUDEN
C2: GRM21BR61C335K, MURATA
www.DataSheet4U.com
90
C2
3.3μF
85
80
20mA
RFB
5Ω
75
70
65
60
0
VIN=4.2V
VIN=3.6V
VIN=3V
3 LEDs, 6.8μH
L1: GTSD31-6R8M, GOTREND
D1: SS0540, PAN JIT
Test Circuit refer to Fig.1
5 10 15 20 25 30
LED Current (mA)
Fig. 1 Li-Ion Powered Driver for Three White LEDs
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510 www.analog.com.tw
DS-3643G-01 20090820
1
1 page  
AIC3643
TYPICAL PERFORMANCE CHARACTERISTICS
200
FB=V
190 IN
180
170
160
150
140
130
120
Non-Switching
110
100
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Supply Voltage (V)
Fig. 2 Supply Current vs. Supply Voltage
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
2.5 3.0 3.5 4.0 4.5 5.0
Supply Voltage (V)
Fig. 4 RDS_ON vs. Supply Voltage
5.5
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
-40
-20
0
20 40 60 80
Temperature (oC)
Fig. 6 Switching Frequency vs. Temperature
www.DataSheet4U.com
1600
1400
FB=GND
1200
1000
800 Switching
2.5 3.0 3.5 4.0 4.5 5.0 5.5
Supply Voltage (V)
Fig. 3 Supply Current vs. Supply Voltage
100
VIN=3.6V; L=6.8μH
80
CIN=1μF; COUT=3.3μF
3LEDs
60 2kHz
1kHz
40 500Hz
100Hz
20
200Hz
0
0 10 20 30 40 50 60 70 80 90 100
SHDN PIN PWM Duty (%)
Fig. 5 Dimming Control by Shutdown Pin
110
108
106
104
102
100
98
96
-40 -20 0 20 40 60 80
Temperature (oC)
Fig. 7 Feedback Voltage vs. Temperature
5
5 Page 
PHYSICAL DIMENSIONS (unit: mm)
SOT-23-6 PACKAGE OUTLINE DRAWING
D
AIC3643
A Ae
e1
SEE VIEW B
WITH PLATING
b
BASE METAL
SECTION A-A
L
L1
VIEW B
GAUGE PLANE
SEATING PLANE
Note : 1. Refer to JEDEC MO-178AB.
2. Dimension "D" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 10 mil per side.
3. Dimension "E1" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
www.DataSheet4U.com
S
Y
M
B
O
L
A
A1
A2
b
c
D
E
E1
e
e1
L
L1
θ
SOT-23-6
MILLIMETERS
MIN.
0.95
0.05
0.90
0.30
0.08
2.80
2.60
1.50
0.95 BSC
1.90 BSC
0.30
0.42 REF
0°
MAX.
1.45
0.15
1.30
0.50
0.22
3.00
3.00
1.70
0.60
8°
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AIC3643.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AIC3643 | Built-in OVP White LED Step-Up Converter | Analog Integrations |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |