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PDF ( 数据手册 , 数据表 ) WD3168

零件编号 WD3168
描述 5V/300mA Charge Pump Device
制造商 WillSEMI
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WD3168 数据手册, 描述, 功能
WD3168
5V/300mA Charge Pump Device
WD3168
Http//:www.sh-willsemi.com
Descriptions
The WD3168 is a switched capacitor voltage converter
which produces a regulated, low noise, and low-ripple
output voltage (5V) from an unregulated input voltage.
It maintains 5V regulation even when VIN is greater
than 5V. The 5V output can supply a maximum of
300mA current with a small package.
WD3168 operates in skip-mode when the load current
falls below 4mA under typical condition. In skip-mode
operation, quiescent current is reduced to 170uA.Only
3 external capacitors are needed to generate output
voltage, thereby saving PCB space. Inrush current is
limited by the soft start function during power on and
power transient states.
The WD3168 has built-in current limit protection that is
ideal for HDMI, USB OTG and other battery powered
applications. The WD3168 is available in Green
SOT-23-6L package and is specified over an ambient
temperature range of -40to +85.
Features
● Output Current up to 300mA
● Wide Input Voltage Range: 2.7V to 5.5V
● Fixed Output Voltage of 5.0V
● x2 Charge Pump
● Minimum External Components: No Inductors
● High Frequency Operation: 1.7MHz
● Automatic Soft Start Limits Inrush Current
● Low Ripple and EMI
● Thermal and Over Current Protection
● Typical 170uA Quiescent Current at no Load
condition (Skip-mode)
SOT-23-6L
Pin configuration (Top view)
6 54
3168
EAYW
1 23
SOT-23-6L
3168 = Device code
EA = Special code
Y = Year code
W = Week code
Marking
Applications
3V to 5V Boost Conversion
USB On-The-Go or HDMI 5V Supply
Local 5V Supply from Lower Rail
Battery Backup Systems
Handheld Portable Devices
Order Information
Device
WD3168E-6/TR
Package
SOT-23-6L
Shipping
3000/Reel&Tape
Will Semiconductor Ltd.
1 Jan, 2015 - Rev. 1.1







WD3168 pdf, 数据表
Operation Information
The WD3168 uses a switched capacitor charge
pump to boost the VIN voltage to a regulated
output voltage. Regulation is achieved by sensing
the output voltage through an internal resistor
divider and modulating the charge pump output
current based on the error signal. A two-phase
non-overlapping clock activates the charge pump
switches. The flying capacitor is charged from VIN
on the first phase of the clock. On the second phase
of the clock it is stacked in series with VIN and
connected to VOUT. The charging and discharging
the flying capacitor continues at a free running
frequency of typically 1.7MHz.
In shut down (EN=logic low) mode all circuitry is
turned off and the WD3168 draws only leakage
current from the VIN supply. VOUT is disconnected
from VIN. EN has an internal pull-down resistor and
can be left floating.
WD3168
pre-bias current of the output stage to reduce the
power consumption. As the load current rises above
typically 10mA, it will return to normal constant-
frequency mode, thereby re-enabling the oscillator
and increasing the pre-bias current of the output
stage to supply output current. Constant-frequency
mode, due to higher operating current, is less
efficient at light loads than skip mode. The skip
threshold voltage and current depends on input
voltage and output current conditions.
Tradeoffs Between Operating Modes
Feature
Skip Mode
Normal Mode
Best Light-Load
YES
Efficiency
Smallest External
YES
Component Size
Output Frequency Variable
Constant
Output Ripple
Relatively Large Relatively Small
Load Regulation
Very Good
Good
The WD3168 has built-in short-circuit current
limiting when output is overloaded or shorted to
ground. The WD3168 ensures a limit of 500mA or
less which is mandated by the HDMI electrical
specification. The further avoid damage when
output is shorted to ground, the short circuit
protection circuitry senses the output voltage and
clamp the maximum output current to a lower value,
typically 90mA.
The WD3168 has thermal shutdown circuitry that
protects it from damage caused by overload
conditions. The thermal protection circuitry disables
the output when the junction temperature reaches
approximately 150oC, allowing the device to cool.
When it cools to approximately 120oC, the output
circuitry is automatically re-enabled.
The WD3168 has both normal constant-frequency
mode and skip mode operation. As the load current
falls below 4mA, it will enter skip mode. In which, the
WD3168 disables the oscillator and decreases the
Will Semiconductor Ltd.
The WD3168 charge pump circuit only requires 3
capacitors (recommended values): 1μF input, 1μF
output and 1μF flying capacitors. For the input
capacitor, a larger value of 4.7μF will help reduce
input voltage ripple for applications sensitive to
ripple on the battery voltage. All the capacitors
should be surface mount ceramic for low lead
inductance necessary at the 1.7MHz switching
frequency and to obtain low ESR(<0.03Ω@
100KHz), which improves bypassing on the input
and output and improves output voltage drive by
reducing output resistance. Ceramic capacitors with
X5R or X7R temperature grade and 0402 or 0603
size are recommended for most applications.
The input and output capacitors should be located
as close to the VIN and VOUT pins as possible to
obtain best bypassing, and the returns should be
connected directly to the GND pin or ground located
under the WD3168. The flying capacitors should be
respectively located across CP+ and CP- pins as
close as possible. To obtain lower output ripple, the
COUT value can be increased from 1uF to 2.2μF or to
4.7μF with a corresponding decrease in output
ripple.
8 Jan, 2015 - Rev. 1.1














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