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PDF ( 数据手册 , 数据表 ) WD3610DA

零件编号 WD3610DA
描述 1000mA Buck/Boost Charge Pump Flash LED Driver
制造商 WillSEMI
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WD3610DA 数据手册, 描述, 功能
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 pdf, 数据表
Operation Information
The WD3610DA is a charge pump regulator
designed for converting a Li-Ion battery voltage of
2.7V to 4.2V to drive a white LED used in digital still
camera Flash and Torch applications. Flash mode of
WD3610DA is usually used with a pulse about 1.2
seconds to generate a high intensity Flash. Torch of
WD3610DA can be used continuously at a lower
output current than Flash and is often used for
several seconds in a digital still camera “movie”
mode.
WD3610DA
When in Flash mode, (Flash = “High”), the FB
regulation voltage is set by the resistor RSET
connected between the RSET pin and SGND and the
equation:
VFB =(1.26V / RSET)x10.2kΩ(Flash Mode)
The output current is then set in either Flash or
Torch mode by the equation:
IOUT = VFB / RSENSE
The WD3610DA also has two modes of operation to
control the output current: the 1X mode and 2X
mode. Operation begins after the enable pin EN
receives a logic high, and then WD3610DA goes
through a soft-start mode designed to reduce inrush
current. The WD3610DA starts in the 1X mode,
which acts like a linear regulator to control the
output current by continuously monitoring the
feedback pin FB. In 1X mode, as FB pin is below the
regulation point, the WD3610DA automatically
switches to the 2X mode. The WD3610DA remains
in the 2X mode until one of four things happens:
1) The enable pin EN has been toggled.
2) The Flash pin has changed from high to low.
3) VIN is cycled or VIN recovers
4) A thermal fault occurs.
Typical values of RSET are 68kΩ to 150kΩ for a
range of VFB = 205mV to 93mV in Flash mode
The 2X mode is the charge pump mode where the
output can be pumped as high as two times the
input voltage, provided the output does not exceed
the maximum voltage for the WD3610DA, which is
internally limited to about 5.5V. In the 2X mode, as
in the 1X mode, the output current is regulated by
the voltage at the FB pin.
In the Torch mode, (Flash = “GND”) the Flash pin is
set to logic low and the WD3610DA FB pin regulates
to typical 50mV output:
VFB = 50mV (Torch Mode)
Will Semiconductor Ltd.
8 Jun, 2016 - Rev. 1.0














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