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NCP3235 Datasheet(PDF) 5 Page - ON Semiconductor

Part # NCP3235
Description  High Current Synchronous Buck Converter
PDF  16 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP3235 Datasheet(HTML) 5 Page - ON Semiconductor

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NCP3235
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Table 4. ELECTRICAL CHARACTERISTICS
(−40
°C < TJ < +125°C, VCC = 12 V, for min/max values unless otherwise noted, TJ = +25°C for typical values)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
POWER SUPPLY
VIN/VCC Operation Voltage
VIN/VCC
4.5
21
V
VB UVLO Threshold (Rising)
4.2
4.3
4.4
V
VB UVLO Threshold (Falling)
3.8
3.95
4.0
V
VB Output Voltage
VB
VCC = 6 V, 0
≤ IB ≤ 40 mA
4.86
5.15
5.45
V
VB Dropout voltage
IB = 25 mA, VCC = 4.5 V
65
120
mV
VCC Quiescent Current
EN=H, COMP=H, no switching;
PG open; no switching
4.7
6.4
mA
Shutdown Supply Current
EN=0; Vcc=21 V; PG open
100
140
mA
EN=0; Vcc=4.5; PG open
75
85
mA
FEEDBACK VOLTAGE
FB input voltage
VFB
TJ = 25
°C, 4.5 V ≤ VCC ≤ 21 V
597
600
603
mV
−40
°C ≤ TJ ≤ 125°C;
4.5 V
≤ VCC ≤ 21 V
594
600
606
Feedback Input Bias Current
IFB
VFB = 0.6 V
75
nA
ERROR AMPLIFIER
Open Loop DC Gain (GBD)
60
85
dB
Open Loop Unity Gain Bandwidth
F0dB,EA
24
MHz
Open Loop Phase Margin
60
deg
Slew Rate
COMP pin to GND = 10 pF
2.5
V/
m
COMP Clamp Voltage, High
3.3
V
COMP Clamp Voltage, Low
0.57
V
Output Source Current
VFB = 0.55 V
15
mA
Output Sink Current
VFB = 1 V
20
mA
CURRENT LIMIT
Low−side RDS(on)/ISET
RDS(on)/
ISET
Guaranteed by
characterization, TJ = 25°C
108
W/A
Low−side ISET Current Source
Temperature Coefficient
TC_LS_ISET
+0.33
%/
°C
Low−side OCP switch−over threshold
Guaranteed by design
600
mV
Low−side Fixed OCP threshold
LS_OCPth
Guaranteed by design
600
mV
Low−side programmable OCP range
Guaranteed by design
<600
mV
LS OCP Blanking time
LS_Tblnk
Guaranteed by design
150
ns
PWM
Maximum duty cycle
fsw = 550 kHz,
4.5 V < VCC < 21 V
87
%
fsw = 1.1 MHz,
4.5 V < VCC < 21 V
76
Minimum duty cycle
VCOMP < PWM Ramp Offset
Voltage
0
%
Minimum GH on−time
Guaranteed by design
35
ns
PWM Ramp Amplitude
Guaranteed by characterization
VCC/7.9
VCC/6.5
VCC/5.6
V
PWM Ramp Offset
0.67
V



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