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參數(shù)資料
| 型號： | LSP3603TCAK |
| 廠商： | LITE-ON SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 4/7頁 |
| 文件大小： | 143K |
| 代理商： | LSP3603TCAK |
Liteon Semiconductor Corporation
LSP3603
1.2 MHZ, 300mA Synchronous Step-Up Converter
Rev1.0
4/7
PIN DESCRIPTION
Low Voltage Start-Up
Pulse Skipping Mode
Antiringing Control
Synchronous Rectification
Current Mode PWM Control
Device Shutdown
The LSP3603 is a synchronous step-up DC-DC
converter. It utilizes internal MOSFETs to achieve
high efficiency over the full load current range. It
operates at a fixed switching frequency of 1.2MHz,
and uses the slope compensated current mode
architecture. The device can operate with input voltage
even below 1 V and the typical start-up voltage is 0.85V
The LSP3603 can start up at supply voltage down to
0.85V. During start-up, the internal low voltage
start-up circuitry controls the NMOS switch to
maximum peak inductor current. The device leaves
the start-up mode once the VOUT exceeds 2.3V. A
Comparator (VOUT GOOD Comp) monitors the
output voltage and allows the chip into normal
operation once the VOUT exceeds 2.3V. The device is
biased by VIN during start-up while biased by VOUT
once VOUT exceeds VIN then the operation will be
independent of VIN
The LSP3603 integrates a synchronous rectifier to
improve efficiency as well as to eliminate the
external Schottky diode. The synchronous rectifier is
used to reduce the conduction loss contributed by
the forward voltage of Scho ttky diode . T h e
synchronous rectifier is realized by a P-ch MOSFET
with gate control circuitry that incorporates relatively
complicated timing concerns.
The LSP3603 is based on a slope compensated
current mode control topology. It operates at a fixed
frequency of 1.2MHz. At the beginning of each
clock cycle, the main switch (NMOS) is turned on
and the inductor current starts to ramp. After the
maximum duty cycle or the sense current signal
equals to the error amplifier (EA) output, the main
switch is turned off and the synchronous switch
(PMOS) is turn on. This control topology features
cycle by cycle current limiting which can prevent
the main switch from overstress and prevent
external inductor from saturation.
At very light load, the LSP3603 automatically
switches into Pulse Skipping Mode to improve
efficiency. During this mode, the PWM control will
skip some pulses to maintain regulation. If the load
increases and the output voltage drops, the device
will automatically switch back to normal PWM
mode and maintain regulation.
An antiringing circuitry is included to remove the
high frequency ringing that appears on the SW pin
when the inductor current goes to zero. In this case,
a ringing on the SW pin is induced due to remaining
energy stored in parasitic components of switch and
inductor. The antiringing circuitry clamps the
voltage internally to battery voltage and therefore
dampens this ringing.
When EN is set logic high, the LSP3603 is put into
operation. If EN is set logic low, the device is put
into shutdown mode and consumes lower than 1 A
current. After start-up timing, the internal circuitry is
supplied by VOUT, however, if shutdown mode is
enabled, the internal circuitry will be supplied by
battery again
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