ncp1570d ON Semiconductor, ncp1570d Datasheet - Page 4

• Manufacturer Part Number: ncp1570d
• Description: Low Voltage Synchronous Buck Controller
• Manufacturer: ON Semiconductor

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