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LM2736 Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza LM2736
Descripción Electrónicos  LM2736 Thin SOT 750mA Load Step-Down DC-DC Regulator
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Fabricante Electrónico  TI [Texas Instruments]
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LM2736 Datasheet(HTML) 8 Page - Texas Instruments

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BOOST
SW
GND
L
D1
D2
COUT
CBOOST
VOUT
CIN
VIN
VIN
VBOOST
0
0
VIN
VD
TON
t
t
Inductor
Current
D = TON/TSW
VSW
TOFF
TSW
IL
IPK
SW
Voltage
LM2736
SNVS316F – SEPTEMBER 2004 – REVISED APRIL 2013
www.ti.com
Figure 20. LM2736 Waveforms of SW Pin Voltage and Inductor Current
BOOST FUNCTION
Capacitor CBOOST and diode D2 in Figure 21 are used to generate a voltage VBOOST. VBOOST - VSW is the gate
drive voltage to the internal NMOS control switch. To properly drive the internal NMOS switch during its on-time,
VBOOST needs to be at least 1.6V greater than VSW. Although the LM2736 will operate with this minimum voltage,
it may not have sufficient gate drive to supply large values of output current. Therefore, it is recommended that
VBOOST be greater than 2.5V above VSW for best efficiency. VBOOST – VSW should not exceed the maximum
operating limit of 5.5V.
5.5V > VBOOST – VSW > 2.5V for best performance.
Figure 21. VOUT Charges CBOOST
When the LM2736 starts up, internal circuitry from the BOOST pin supplies a maximum of 20mA to CBOOST. This
current charges CBOOST to a voltage sufficient to turn the switch on. The BOOST pin will continue to source
current to CBOOST until the voltage at the feedback pin is greater than 1.18V.
There are various methods to derive VBOOST:
1. From the input voltage (VIN)
2. From the output voltage (VOUT)
3. From an external distributed voltage rail (VEXT)
4. From a shunt or series zener diode
In the Simplifed Block Diagram of Figure 19, capacitor CBOOST and diode D2 supply the gate-drive current for the
NMOS switch. Capacitor CBOOST is charged via diode D2 by VIN. During a normal switching cycle, when the
internal NMOS control switch is off (TOFF) (refer to Figure 20), VBOOST equals VIN minus the forward voltage of D2
(VFD2), during which the current in the inductor (L) forward biases the Schottky diode D1 (VFD1). Therefore the
voltage stored across CBOOST is
VBOOST - VSW = VIN - VFD2 + VFD1
(1)
8
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