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PDF AS3685A Data sheet ( Hoja de datos )
| Número de pieza | AS3685A | |
| Descripción | Ultra Small High Efficiency 1000mA Charge Pump | |
| Fabricantes | ams | |
| Logotipo |  |
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AS3685A/AS3685B
Ultra Small High Efficiency 1000mA
Charge Pump for White LED Flash
General Description
The AS3685 is low noise high efficiency capacitive charge pump
with 1:1, 1:1.5 and 1:2 operating modes in a small 3x3mm DFN10
or a tiny 2x1.5mm WL-CSP (Wafer Level Chip Scale Package)
package. It can drive one flash LED at up to 1000mA current. It
supports flash/torch and indicator mode for the
flash LED.
Additionally the AS3685 limits the flash time automatically to
protect the flash LED.
Ordering Information and Content Guide appear at end of
datasheet.
Key Benefits & Features
The benefits and features of AS3685A/AS3685B, Ultra Small
High Efficiency 1000mA Charge Pump for White LED Flash are
listed below:
Figure 1:
Added Value Of Using AS3685A/AS3685B
Benefits
Features
• System safety
• High efficiency capactive charge pump with 1:1, 1:1.5
and 1:2 modes therefore maximum input current is
exactly controlled.
• Overtemperature protection
• Automatic 800ms flash timeout to protect the flash
LED
• Drive LED at high brightness for better pictures • Up to 1000mA LED Current
• Flexible selection of interface type
• Two device variants:
• AS3685A: Direct control to select three currents
• AS3685B: Single pin interface or two pin
interface with strobe input; 17 different currents
can be selected
• Flexible package options
• DFN10 (3x3mm) 10 pins + exposed pad
• WL-CSP (2x1.5mm) 3x4 balls 0.5mm pitch
ams Datasheet
[v2-23] 2016-Mar-30
Page 1
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1 page  
AS3685A/AS3685B − Pin Assignment
Figure 6:
Pin Description WL-CSP (2x1.5mm)
Pin
Number
A1
A2
Pin
Name
EN1
VSS
A3 ISET
B1 C1+
B2 VCP
B3 EN2
C1 VBAT
C2 C2+
C3 ILED
D1 C2-
D2 C1-
D3 VSS
Type
Description
DI Digital Control Signal EN1
S
Ground Connection – a proper thermal connection to the ground
plane is recommended
AI/O
Current Generator input pin – connect current set resistor RISET
between this pin and VSS (and optional RTXMASK)
Flying Capacitor 1 connection – connect 1μF ceramic capacitor
AI/O CFLY1 between C1- and C1+
Charge Pump Output voltage – connect flash LED anode to this pin
AI/O and add CVCP capacitor with 2.2μF to VSS
DI Digital Control Signal EN2
S Battery Supply Voltage
Flying Capacitor 2 connection – connect 1μF ceramic capacitor
AI/O CFLY2 between C2- and C2+
AI/O Current Source input pin – connect flash LED cathode to this pin
Flying Capacitor 2 connection – connect 1μF ceramic capacitor
AI/O CFLY2 between C2- and C2+
Flying capacitor 1 connection – connect 1μF ceramic capacitor
AI/O CFLY1 between C1- and C1+
S
Ground Connection – a proper thermal connection to the ground
plane is recommended
Note(s):
1. Pin Type Descriptions WL-CSP (2x1.5mm):
AI/O: Analog Pin
DI: Digital Input
S: Supply Pin
ams Datasheet
[v2-23] 2016-Mar-30
Page 5
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5 Page 
AS3685A/AS3685B − Typical Operating Characteristics
Figure 15:
LED Current I(ILED) vs. Battery Voltage (with Lumiled PWF1)
0.8
0.7 ILED=700m
0.6 ILED=600m
0.5 ILED=500m
0.4 ILED=400m
0.3 ILED=300m
0.2 ILED=200m
0.1 ILED=100m
ILED=50m
0.0
2.8 3.2 3.6 4.0 4.4 4.8 5.2
VBAT [V]
Figure 16:
Linearity of Current Sink
0.8
0.7 ILED=700m
0.6 ILED=600m
0.5 ILED=500m
0.4 ILED=400m
0.3 ILED=300m
0.2 ILED=200m
0.1 ILED=100m
ILED=50m
0.0
0.0 0.5 1.0 1.5 2.0 2.5
VILED [V]
ams Datasheet
[v2-23] 2016-Mar-30
Page 11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS3685A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AS3685A | Ultra Small High Efficiency 1000mA Charge Pump | ams |
| AS3685A | Ultra Small High Efficiency 1000mA Charge Pump for White LED Flash |  austriamicrosystems |
| AS3685B | Ultra Small High Efficiency 1000mA Charge Pump | ams |
| AS3685B | Ultra Small High Efficiency 1000mA Charge Pump for White LED Flash | austriamicrosystems |
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