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PDF AP3605 Data sheet ( Hoja de datos )
| Número de pieza | AP3605 | |
| Descripción | 4-Channel Charge Pump LED Driver | |
| Fabricantes | BCD Semiconductor | |
| Logotipo |  |
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Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
General Description
Features
The AP3605 is a step-up DC/DC converter based on
1.5x charge pump current source, it is specially
designed for LED supplies in backlight display.
The AP3605 can provide constant current up to 20mA
for each LED, which is programmed by an external
resistor, so it has a total capability to provide 80mA for
4 LEDs. The chip has a good performance of LED
current matching and allows PWM brightness dim-
ming control. Additionally, high switching frequency
up to 1MHz enables the use of two small external
flying capacitors. Internal soft-start circuitry prevents
excessive inrush current during start-up.
The AP3605 supply voltage range is from 2.7V to
5.5V, ideally suited for applications powered by the Li-
ion battery.
· Regulated Output Current with ±3% Matching
· Regulated ±10% Output Current Source
· Drive up to 4 LEDs at 20mA Each
· Wide Operating Voltage Range: 2.7V to 5.5V
· High Efficiency up to 93%
· High Operating Frequency: 1MHz
· Built-in Soft-Start to Limit the Inrush Current
· LED Brightness Control through PWM and Ana-
log Signal
· PWM Dimming Frequency up to 50kHz
· Built-in Standby Mode to Get PWM Dimming
Duty Cycle Control Linearity
· Built-in OTSD (Over Temperature Shutdown)
Function to Protect the Device from Burn Out
Applications
The AP3605 is available in a 3mmx3mm QFN-3x3-16
tiny package. Its operating temperature range is -40oC
to 85oC.
·
·
·
Mobile Phone
MP3, MP4
White LED Backlight in Mobile Phone, PDA
Jan. 2013 Rev. 1. 8
QFN-3x3-16
Figure 1. Package Type of AP3605
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Electrical Characteristics
(VIN=3.5V, VEN=VIN, RISET=1.8kΩ, CFLY1=CFLY2=CIN=COUT=1μF, TA=25oC, VD1=VD2=VD3=VD4=3.4V, unless
otherwise specified. )
Parameter
Input Section
Input Voltage
Supply Current
Shutdown Supply Current
Charge Pump Section
Switching Frequency
Efficiency
Symbol
Conditions
VIN
ICC
ISHDN
ID=0 to 40 mA
No Load, ISET floating
VEN=GND
fOSC
η
VIN=3.5V, ID=40mA Total
Min Typ Max Unit
2.7 5.5 V
1.5 2.5 mA
0.1 1 μA
0.65 1 1.35 MHz
93 %
Current Source Section
Maximum Output Current per
Source
Current Matching between Any
Two Outputs
IDX
ID-MATCH
3.2V≤VIN≤5.5V,
TA=-40oC to 85oC
18 20 22 mA
-3 3 %
Output Current Line Regulation
(ΔID/ID)/
ΔV
3.5V≤VIN≤5.5V
-2 2 %/V
Current Matching between Any
Two Outputs under Different LED
Forward Voltage
Reference Voltage for Current Set
ΔID/ID 3.0V≤VD≤4.0V, VIN=3.5V
VISET
-5 5 %
1.193 1.23 1.267
V
ID to ISET Current Ratio
K
100 120 140
Enable Section
EN High Level Threshold Voltage VIH
EN Low Level Threshold Voltage
VIL
EN Input Leakage Current
IEN VEN=5.5V
EN Low Threshold Time for
Standby State
tSTB
1.4 V
0.5 V
-1 1 μA
2 ms
Total Device
Soft-Start Time
Thermal Shutdown
Thermal Shutdown Hysteresis
tSS
TOTSD
THYS
ID=80mA Total
400 μs
160 oC
20 oC
Jan. 2013 Rev. 1. 8
BCD Semiconductor Manufacturing Limited
5
5 Page 
Data Sheet
4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605
Typical Application (Continued)
C1 1μF
C2 1μF
EN
Li-ion
Battery
PWM Dimming
1kHz to 50kHz
C1+ C1- C2+ C2-
EN D1
VIN
VOUT1
AP3605
D2
D3
VOUT2
D4
CIN
1μF
COUT
1μF
ISET
RISET
GND
Figure 19. AP3605 Typical Application Circuit with 3 WLEDs
Jan. 2013 Rev. 1. 8
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet AP3605.PDF ] | |
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