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PDF AP2071AEN Data sheet ( Hoja de datos )
| Número de pieza | AP2071AEN | |
| Descripción | High Current (8A) white LEDs driver | |
| Fabricantes | AKM | |
| Logotipo |  |
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[AP2071AEN]
AP2071AEN
High Current (8A) white LEDs driver for Flash with I2C
1. General Description
The AP2071AEN is a white LED driver IC for camera flash, using EDLC (Electronic Double Layer
Capacitor) in portable equipment. The AP2071AEN integrates a current mode synchronous boost DC-DC
converter and four maximum 2A current sources (maximum 8.0A total). The internal boost DC-DC converter
integrates a switching FET and synchronous rectifier, and supporting small size multilayer inductor with
2MHz switching frequency. An integrated EDLC voltage control circuit and a charge current control circuit
makes the AP2071AEN most suitable for EDLC charge systems. The AP2071AEN also includes eight
protections that are an under voltage lock out, EDLC cell short/open protection, thermal detection, LED
open/short detection, LED thermal protection, output-ground short protection, inductor current limitation and
flashing time limitation to avoid significant system problems. Flash current, torch current, charge current,
inductor limit current, flash on-time and EDLC full charge voltage are programmable through I2C interface.
The AP2071AEN is housed in a small size package (24-pin QFN, 4.0mm x 4.0mm) to utilize less board space.
2. Features
Power Supply Voltage(VIN): 2.5V~5.5V
LED Current:
max 8.0A, total (max 2.0A/ch)
High Efficiency:
- 90% @ VIN pin=3.7V, VOUT pin=4.5V, total LED current= 240mA,
Torch mode, with recommended external parts
Switching Frequency:
2.0 MHz
Mode:
- Charge (charge to EDLC)
- Flash
- Torch
- Bypass torch
(Boost circuit off, only drive LEDs with fixed current source)
- Discharge
I2C Function:
- Flash/Torch LED current setting (Each channel can be set independently)
- Flashing ON-time setting
- Charge current setting
- Current Limit value setting
- Full charge voltage setting (EDLC)
- Discharge finishing voltage setting (EDLC)
- NTC voltage detection voltage setting
Protection Function:
- UVLO (Under Voltage Lock Out) protection
- EDLC cell short/open protection
- Thermal protection
- LED Open/Short protection
- LED thermal protection
- Output-GND protection
- Inductor current limitation protection
- Flashing time limitation protection
Ta:
Package:
-30 to 85C
24-pinUQFN (4.0 x 4.0mm, 0.5mm pitch)
MS1607-E-00
-1-
2014/03
1 page  
[AP2071AEN]
6. Absolute Maximum Ratings
(AGND=PGND=GND1~6=0V; (Note 1))
Parameter
Symbol
min
max
Unit
VIN, SW, VOUT, LED1, LED2, LED3, LED4,
NTC and VCAP pins
VIN1
0.3
6.5
V
DET, EN, STROBE, CHARGE, SCL, SDA and
ADDR pins (Note 2)
VIN2
0.3 VIN + 0.3
V
Junction Temperature
Storage Temperature
Maximum Power Dissipation (Note 3)
TJ
TSTG
PD
-
55
125
150
2.5
C
C
W
Note 1. All voltage is respect to ground. All ground should be connecting to same ground.
Note 2. The maximum value is a lower value either 6.5V or VIN+0.3V.
Note 3. Measured by recommended foot pattern; Size: 50 x 40mm x 1.0mm, 2 layered board (metal densities
of top layer: 80%, metal densities of bottom layer: 80%). This value is reduced by 25mW/C when the
temperature is more than 25C (Ta≥25). The thermal resistance is 40C/W
The value is internal dissipation of the AP2071AEN that does not include power dissipation of
external parts.
“Exposed PAD” must be connected to ground.
Note: Since the actual thermal resistance is much dependent on the board layout and the thermal design, make
sure that the junction temperature of the IC will not exceed 125°C by the system design.
WARNING: Operation at or beyond these limits may result in permanent damage to the device.
Normal operation is guaranteed at these extremes.
7. Recommended Operating Conditions
(AGND=PGND=GND1~6=0V; (Note 1))
Parameter
Symbol min
typ max Unit
Input Voltage (VIN)
Vbatt 2.5 3.7 5.5 V
SCL, SDA, STROBE, CHARGE, EN, ADDR pins
Operation Temperature
VINPUT
Ta
1.2
-30
VIN V
25 85 C
MS1607-E-00
-5-
2014/03
5 Page 
[AP2071AEN]
■ Torching Sequence
A battery can drive LEDs which is connected to the LED1~4 pins through the VOUT pin. The LED current
(torching current) can be set in the range from 10mA to 140mA by a register setting. The AP2071AEN will be
in torch mode by setting TORCH bit to “1” after setting the EN pin to “H” if the CHARGE pin is “H” or
CHAR bit is “1”. LEDs can be driven when the VOUT voltage reaches the voltage which is set by VSET[2:0]
bits.
The stable VOUT voltage is determined by input voltage (VIN), VOUT setting voltage (VSET) and LED VF.
Formula (1): In the case of VSET > VF + 0.5V > VIN*1.07
VOUT = VF + 0.5V
Formula (2): In the case of VSET > VIN*1.07 > VF + 0.5V
VOUT = VIN *1.07
Formula (3): In the case of VF > VSET → LED cannot be driven.
Set appropriate VOUT voltage for LEDs in consideration of VF value of LED.
MS1607-E-00
- 11 -
2014/03
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AP2071AEN.PDF ] | |
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