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NCP1580 Datasheet(PDF) 3 Page - ON Semiconductor

Part No. NCP1580
Description  Low Voltage Synchronous Buck Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1580 Datasheet(HTML) 3 Page - ON Semiconductor

 
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NCP1580
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 13.2 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
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.
This pin should not be shorted to ground to disable switching.
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. A Schottky diode between this pin and ground is recommended to reduce negative transient
voltages which is common in a power supply system.
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
30 V
−0.7 V, t > 50 ns
−2.0 V, t < 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
Feedback
FB
5.5 V
−0.3 V
COMP
COMP
5.5 V
−0.3 V
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
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
ESD Susceptibility
Human Body Model
Charge Device Model
2.0
200
kV
V
Moisture Sensitivity Level
MSL
1
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.


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