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WD3610DA Schematic ( PDF Datasheet ) - WillSEMI

Teilenummer WD3610DA
Beschreibung 1000mA Buck/Boost Charge Pump Flash LED Driver
Hersteller WillSEMI
Logo WillSEMI Logo 




Gesamt 13 Seiten
WD3610DA Datasheet, Funktion
WD3610DA
1000mA Buck/Boost
Charge Pump Flash LED Driver
WD3610DA
Http//:www.sh-willsemi.com
Description
The WD3610DA 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 WD3610DA automatically switches modes
between step-up and step-down ensuring that LED
current does not depend on the forward voltage. It
switches at 2.4MHz, 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 WD3610DA 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 WD3610DA 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)
3610
DAYW
WD3610DA
3610DA = 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: 2.4MHz
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
WD3610DA-10/TR
Function
With timeout
Package
DFN3x3-10L
Shipping 3000/Reel&Tape
Applications
Cellphones
PADs
1 Jun, 2016 - Rev. 1.0






WD3610DA Datasheet, Funktion
WD3610DA
Typical Characteristics (Ta=25oC, CIN = 4.7uF, COUT = 4.7uF, CF=1uF, unless otherwise noted)
Ripple 1X Flash 1000mA
Ripple 1X Torch 250mA
Ripple 2X Flash 1000mA
Ripple 2X Torch 250mA
Startup 1000mA Flash
Startup 250mA Torch
Will Semiconductor Ltd.
6 Jun, 2016 - Rev. 1.0

6 Page









WD3610DA pdf, datenblatt
EVALUATION BOARD LAYOUT
WD3610DA
Printed Circuit Board Layout Recommendations
Follow the PCB layout guidelines for optimal performance:
1. Place the flying capacitor CF as close to the chip as possible as possible; otherwise 2x
mode performance will be compromised. Also keep analog components away from this
capacitor.
2. Place input and output decoupling capacitors as close to the chip as possible to reduce
switching noise and output ripple.
3. The power traces, consisting of the VIN/GND trace, the VOUT trace and the WLED trace
should be kept short and wide. Also minimize the feedback loop area (consisting of
WLED/FB) small.
4. Connect the exposed pad to the GND plane to achieve the best power dissipation.
Will Semiconductor Ltd.
12 Jun, 2016 - Rev. 1.0

12 Page





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