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NCP1570 Datasheet(PDF) 4 Page - ON Semiconductor

Part No. NCP1570
Description  Low Voltage Synchronous Buck Controller
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1570 Datasheet(HTML) 4 Page - ON Semiconductor

 
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NCP1570
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (continued) (0°C < TJ < 125°C, 11.4 V < VCC < 12.6 V, CGATE(H) = CGATE(L) = 3.3 nF,
CPGDELAY = 0.01 μF, CCOMP = 0.1 μF; unless otherwise specified.)
Characteristic
Unit
Max
Typ
Min
Test Conditions
PWM Comparator
PWM Comparator Offset
VFB = 0 V, Increase COMP Until GATE(H)
Starts Switching
0.475
0.525
0.575
V
Ramp Max Duty Cycle
80
%
Artificial Ramp
Duty Cycle = 50%
18
25
35
mV
Transient Response
COMP = 1.5 V, VFB 20 mV Overdrive.
Note 3
200
300
ns
VFB Input Range
Note 3
0
1.4
V
Oscillator
Switching Frequency
150
200
250
kHz
General Electrical Specifications
VCC Supply Current
COMP = 0 V (No Switching)
10
15
mA
Start Threshold
GATE(H) Switching, COMP Charging
8.0
8.5
9.0
V
Stop Threshold
GATE(H) Not Switching, COMP Discharging
7.0
7.5
8.0
V
Hysteresis
Start − Stop
0.75
1.0
1.25
V
3. Guaranteed by design. Not tested in production.
PACKAGE PIN DESCRIPTION
PACKAGE PIN #
PIN SYMBOL
FUNCTION
SO−8
1
VCC
Power supply input.
2
PWRGD
Open collector output goes low when VFB is out of regulation. User
must externally limit current into this pin to less than 20 mA.
3
PGDELAY
External capacitor programs PWRGD low−to−high transition delay.
4
COMP
Error amp output. PWM comparator reference input. A capacitor to
LGND provides error amp compensation and Soft Start. Pulling pin
< 0.45 locks gate outputs to a zero percent duty cycle state.
5
GATE(H)
High−side switch FET driver pin. Capable of delivering peak currents
of 1.5 A.
6
GATE(L)
Low−side synchronous FET driver pin. Capable of delivering peak
currents of 1.5 A.
7
VFB
Error amplifier and PWM comparator input.
8
GND
Power supply return.


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