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PDF ( 数据手册 , 数据表 ) WD3126

零件编号 WD3126
描述 Boost Converter
制造商 WillSEMI
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WD3126 数据手册, 描述, 功能
WD3126
1A output current, Adj. Output voltage, Boost
Converter with 2.75A Main-Switch
Descriptions
The WD3126 is a high efficiency, peak current control
mode DC-DC boost converter. It supports up to 1A
output current with an integrated low RDS(ON) (130mΩ)
N-channel MOSFET and cycle by cycle current limit
protection. The device can provide a USB 5V
compliant power output from a single Li-ion battery.
The boost converter runs in Pulse-Width Modulation
(PWM) mode, at 1MHz fixed switching frequency to
reduce output ripple, improve conversion efficiency. It
allows for the use of small external components. At
light load currents the converter enters Skipping Mode
to maintain a high efficiency over a wide load current
range. The build-in soft start circuitry minimizes the
inrush current at start-up. Internal compensation
network require only boost inductor, schottky diode,
and input and output capacitors for WD3126, save
PCB area.
The WD3126 is available in SOT-23-6L package.
Standard product is Pb-free and Halogen-free.
Features
Input voltage range
: 2.7~5.5V
Continuous output current : 1.0A
Switching frequency
: 1MHz (Typ.)
Efficiency
: Up to 92%
Main switch current limit : 2.75A (Min.)
Output voltage accuracy :±2%
Applications
MID
Mobile power pack
Mobile phones
Notebook computers
Portable games
WD3126
Http//:www.sh-willsemi.com
SOT-23-6L
1 LX
NC 6
2 GND
VDD 5
3 FB
EN 4
Pin configuration (Top view)
6 54
3126
YYWW
1 23
3126 = Device code
YY = Year code
WW = Week code
Marking
Order information
Device
Package
Shipping
WD3126E-6/TR SOT-23-6L 3000/Reel&Tape
Will Semiconductor Ltd.
1 Jun, 2014 - Rev. 1.0







WD3126 pdf, 数据表
WD3126
Operation Information
Normal Operation
The WD3126 is an adj. voltage output, peak current
controlled DC-DC boost converter. This means that
switch duty cycle is directly controlled by the peak
switch current rather than only by output voltage.
The WD3126 regulates the output voltage using a
combined pulse-width (PWM) and pulse-skipping
(PSM) modulation topology. In PWM mode, the
device runs at a 1MHz fixed frequency. Referring to
the block diagram, the switch is turned ON at the
start of each oscillator cycle. It is turned OFF when
switch current reaches a predetermined level. The
current trip level is set by using an error amplifier
which senses the converter output voltage. The
main switch current sensing voltage signal is
summed by a slope compensation voltage signal.
Slope compensation is necessary to prevent sub-
harmonic oscillations that may occur in peak current
mode architectures when exceeding 50% duty cycle.
At very light loads, the WD3126 will automatically
enter pulse skipping mode (PSM). When the
converter feedback output voltage is slightly higher
than 0.6V, the device will stop switching and skip
some periods to maintain output regulation.
The WD3126 is highly integrated with a low
on-resistance N-MOS switch, internal control-loop
compensation network and soft-start circuitry.
Additional features include Cycle-By-Cycle Current
Limit Protection, Under Voltage Protection and Over
Temperature Protection.
Start-Up
The build-in soft-start function of WD3126 is
implemented to suppress the inrush current to an
acceptable value at the beginning of power on.
Cycle by Cycle Current Limit
The WD3126 uses a cycle-by-cycle current limit
circuitry to limit the inductor peak current in the
event of an overload condition. The current flow
through inductor in charging phase is detected by a
current sensing circuit. As the value comes across
the current limiting threshold the N- MOSFET turns
off, so that the inductor will be forced to leave
charging stage and enter discharging stage.
Therefore, the inductor current will not increase over
the current limiting threshold.
UVLO Protection
To avoid malfunction of the WD3126 at low input
voltages, an under voltage lockout is included that
disables the device, until the input voltage exceeds
2.2V (Typ.).
Shutdown Mode
Drive EN to GND to place the WD3126 in shutdown
mode. In shutdown mode, the reference, control
circuit, and the main switch turn off. Input current
falls to smaller than 1μA during shutdown mode.
Over Temperature Protection (OTP)
As soon as the junction temperature (TJ) exceeds
160oC (Typ.), the WD310 goes into thermal
shutdown. In this mode, the main N-MOSFET is
turned off until temperature falls below typically
130oC. Then the device starts switching again.
Will Semiconductor Ltd.
8 Jun, 2014 - Rev. 1.0














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