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NCP1526 Datasheet(PDF) 10 Page - ON Semiconductor

Part # NCP1526
Description  400 mA, 1.2 V, High?묮fficiency, Step?묭own Converter with Low Noise Voltage Regulator Optimized for RF Module
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1526 Datasheet(HTML) 10 Page - ON Semiconductor

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NCP1526
http://onsemi.com
10
DC−DC OPERATION DESCRIPTION
Detailed Description
The NCP1526 uses a constant frequency, voltage mode
step−down architecture. Both the main (P−Channel
MOSFET) and synchronous (N−Channel MOSFET)
switches are internal.
It delivers a constant voltage from either a single Li−Ion
or three cell NiMH/NiCd battery to portable devices such
as cell phones and PDA. The output voltage accuracy is
well within 3% of the 1.20 V. The NCP1526 can source at
least 400 mA.
PWM Operating Mode
The output voltage of NCP1526 is regulated by
modulating the on−time pulse width of the main switch Q1
at a fixed 3.0 MHz frequency. The switching of the PMOS
Q1 is controlled by a flip−flop driven by the internal
oscillator and a comparator that compares the error signal
from an error amplifier with the PWM ramp. At the
beginning of each cycle, the main switch Q1 is turned ON
by the rising edge of the internal oscillator clock. When the
PWM ramp becomes higher than the error voltage
amplifier the PWM comparator resets the flip−flop, Q1 is
turned OFF and the synchronous switch Q2 is turned ON.
Q2 replaces the external Schottky diode to reduce the
conduction loss and improve the efficiency. To avoid
overall power loss, a certain amount of dead time is
introduced to ensure Q1 is completely turned OFF before
Q2 is being turned ON.
Vin
IPFET
IL
INFET
VO
VLX
3.6040
3.6000
3.5960
400 m
200 m
0.00
400 m
300 m
200 m
400 m
100 m
−200 m
1.205
1.200
1.195
3.70
1.35
−1.00
Figure 24. Waveforms During PWM Operation
Soft−Start
The NCP1526 uses soft−start to limit the inrush current
when the device is initially powered up or enabled.
Soft−start is implemented by gradually increasing the
reference voltage until it reaches the full reference voltage.
During startup, a pulsed current source charges the internal
soft−start capacitor to provide gradually increasing
reference voltage. When the voltage across the capacitor
ramps up to the nominal reference voltage, the pulsed
current source will be switched off and the reference
voltage will switch to the regular reference voltage.
Cycle−by−Cycle Current Limitation
From the block diagram (Figure 2), an ILIM comparator
is used to realize cycle−by−cycle current limit protection.
The comparator compares the LX pin voltage with the
reference voltage, which is biased by a constant current. If
the inductor current reaches the limit, the ILIM comparator
detects the LX voltage falling below the reference voltage
and releases the signal to turn off the switch Q1. The
cycle−by−cycle current limit is set at 1000 mA (nom).


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