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PDF WD3124DA Datasheet ( Hoja de datos )

Número de pieza WD3124DA
Descripción 1000mA Buck/Boost Charge Pump Flash LED Driver
Fabricantes WillSEMI 
Logotipo WillSEMI Logotipo

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WD3124DA Hoja de datos, Descripción, Manual
WD3124DA
1000mA Buck/Boost
Charge Pump Flash LED Driver
WD3124DA
Http//:www.sh-willsemi.com
Description
The WD3124DA is a current-regulated charge pump
ideal for powering high brightness LEDs for camera
flash applications. The charge pump can be set to
regulate two current levels for FLASH and TORCH
modes.
The WD3124DA automatically switches modes
between step-up and step-down ensuring that LED
current does not depend on the forward voltage. It
switches at 2.2MHz, allowing the use of tiny
components. The supply voltage ranges from 2.7V to
5.5V and is ideally suited for all applications powered
by a single LI-Ion battery cell or three to four NiCd,
NiMH, or Alkaline battery cells.
The WD3124DA also features a very low shutdown
current, an automatic soft-start mode to limit inrush
current, as well as over current, over voltage and
over-Thermal shutdown control.
A low current sense reference voltage (50mV) allows
the use of small 0603 current sensing resistors.
The WD3124DA is available in Green DFN3×3-10L
package and is specified over an ambient temperature
range of -40to +85.
DFN3x3-10L
VIN 1
C1 2
C2 3
FLASH 4
EN 5
GND
10 VOUT
9 PGND
8 SGND
7 FB
6 RSET
Pin configuration (Top view)
WD3124DA
3124DA = Device code
Y = Year code
W = Week code
Marking
Features
● Output Current up to 1000mA
● Up to 95% Efficiency in Torch Mode
● Adjustable FLASH Mode Current
● Automatic Buck/Boost Mode Switchover
● Wide Input Voltage Range: 2.7V to 5.5V
● Minimum External Components: No Inductors
● High Frequency Operation: 2.2MHz
● Low 50mV Reference for Low Loss Sensing
● PWM Dimming Control
● Automatic Soft Start Limits Inrush Current
● Low Ripple and EMI
Will Semiconductor Ltd.
Order Information
Device
WD3124DA-10/TR
Function
With timeout
Package
Shipping
DFN3x3-10L
3000/Reel&Tape
Applications
Cellphones
PADs
1 Dec, 2014 - Rev. 1.1

1 page

WD3124DA pdf
WD3124DA
Electronics Characteristics
(Full= -40to +85VIN= 3.6V, CIN = 4.7uF, CF = COUT = 1uF, VEN= VIN, typical values at +25unless
otherwise noted)
Parameter
Symbol
Conditions
Min. Typ. Max. Units
Input Voltage Range
Quiescent Current
VIN 2.7 5.5 V
IQ
VIN=2.7V-5.5V FLASH=GND,
1X Mode ILOAD=100uA
0.3 mA
IQ FLASH = High, 2x mode
2 mA
Shutdown Supply Current
ISHDN
VEN = 0V, VIN=5.5V
1 uA
Feedback
Voltage
reference
VFB
FLASH = VIN, RSET = 68kΩ
FLASH = GND
175 190 205 mV
45 50 55 mV
FB Pin Current
Oscillator Frequency
Charge Pump Equivalent
Resistance (1× mode)
IFB
fOSC
VFB = 0.3V
VIN = 3.6V
1 uA
2.2 MHz
0.5 0.7 Ω
Charge Pump Equivalent
Resistance (2× mode)
EN, FLASH Logic Low
EN, FLASH Logic High
EN, FLASH Pin Current
VOUT Turn-on Time
VEN,FLASH H
VEN,FLASH L
IEN,FLASH
VIN = 3.6V, FB within 90% of
regulation
0.4
1.3
1
250
V
V
uA
us
Thermal Shutdown
Temperature
Maximum Flash ON time
TSHDN
VIN = 3.6V
150
0.8 1.2 1.6
oC
S
Will Semiconductor Ltd.
5 Dec, 2014 - Rev. 1.1

5 Page

WD3124DA arduino
Reference RSET Resistor:
WD3124DA
Part Reference
RSET
RSET
RSET
RSET
RSET
RSET
RSET
RSET
RSET
Value
(Ω)
62k
68K
75K
82K
91K
100K
120K
140K
150K
Package
Tolerance
Size
5% 0402
5% 0402
5% 0402
5% 0402
5% 0402
5% 0402
5% 0402
5% 0402
5% 0402
Flash Current (mA) @ RSENSE =
0.22Ω 0.27 Ω 0.33 Ω 0.39 Ω 0.47 Ω
940 766 627 530
440
859 700 572 484
402
778 634 518 438
363
712 580 474 401
333
640 522 427 361
300
584 476 389 329
273
486 396 324 274
227
416 340 278 235
195
389 317 259 219
182
Reference RSENSE Resistor:
Part Reference
RSENSE
RSENSE
RSENSE
RSENSE
RSENSE
Value (Ω)
0.22
0.27
0.33
0.39
0.47
Tolerance
5%
5%
5%
5%
5%
Package Size
0603
0603
0603
0603
0603
Torch Current (mA)
227
185
151
128
106
Will Semiconductor Ltd.
11 Dec, 2014 - Rev. 1.1

11 Page


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