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NCP1582 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. NCP1582
Description  Low Voltage Synchronous Buck Controllers
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1582 Datasheet(HTML) 3 Page - ON Semiconductor

 
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NCP1582, NCP1582A, NCP1583
http://onsemi.com
3
PIN FUNCTION DESCRIPTION
Pin No.
Symbol
Description
1
BST
Supply rail for the floating top gate driver. To form a boost circuit, use an external diode to bring the
desired input voltage to this pin (cathode connected to BST pin). Connect a capacitor (CBST) between this pin
and the PHASE pin. Typical values for CBST range from 0.1 mF to 1 mF. Ensure that CBST is placed near the IC.
2
TG
Top gate MOSFET driver pin. Connect this pin to the gate of the top N−Channel MOSFET.
3
GND
IC ground reference. All control circuits are referenced to this pin.
4
BG
Bottom gate MOSFET driver pin. Connect this pin to the gate of the bottom N−Channel MOSFET.
5
VCC
Supply rail for the internal circuitry. Operating supply range is 4.5 V to 15 V. Decouple with a 1
mF
capacitor to GND. Ensure that this decoupling capacitor is placed near the IC.
6
FB
This pin is the inverting input to the error amplifier. Use this pin in conjunction with the COMP pin to
compensate the voltage−control feedback loop. Connect this pin to the output resistor divider (if used) or
directly to Vout.
7
COMP/DIS
Compensation Pin. This is the output of the error amplifier (EA) and the non−inverting input of the PWM
comparator. Use this pin in conjunction with the FB pin to compensate the voltage−control feedback loop. The
compensation capacitor also acts as a soft−start capacitor. Pull this pin low with an open drain transistor for
disable.
8
PHASE
Switch node pin. This is the reference for the floating top gate driver. Connect this pin to the source of the top
MOSFET.
ABSOLUTE MAXIMUM RATINGS
Pin Name
Symbol
VMAX
VMIN
Main Supply Voltage Input
VCC
15 V
−0.3 V
Bootstrap Supply Voltage Input
BST
30 V wrt/GND
15 V wrt/PHASE
−0.3 V
Switching Node (Bootstrap Supply Return)
PHASE
24 V
−0.7 V
−5 V for < 50 ns
High−Side Driver Output (Top Gate)
TG
30 V wrt/GND
15 V wrt/PHASE
−0.3 V
wrt/PHASE
Low−Side Driver Output (Bottom Gate)
BG
15 V
−0.3 V
−2 V for < 200 ns
Feedback
FB
5.5 V
−0.3 V
COMP/DISABLE
COMP/DIS
5.5 V
−0.3 V
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Thermal Resistance, Junction−to−Ambient
RqJA
165
°C/W
Thermal Resistance, Junction−to−Case
RqJC
45
°C/W
Operating Junction Temperature Range
TJ
−40 to 150
°C
Operating Ambient Temperature Range
TA
−40 to 85
°C
Storage Temperature Range
Tstg
−55 to +150
°C
Lead Temperature Soldering (10 sec): Reflow (SMD styles only)
Pb−Free
(Note 1)
260 peak
°C
Moisture Sensitivity Level
MSL
1
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. 60−180 seconds minimum above 237
°C.


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