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PDF NCP3235 Data sheet ( Hoja de datos )
| Número de pieza | NCP3235 | |
| Descripción | High Current Synchronous Buck Converter | |
| Fabricantes | ON Semiconductor | |
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NCP3235
High Current Synchronous
Buck Converter
The NCP3235 is a high current, high efficiency voltage mode
synchronous buck converter which operates from 4.5 V to 23 V input
and generates output voltages down to 0.6 V at up to 15 A continuous
current. It has two operation modes: FCCM and automatic
CCM/DCM. In automatic CCM/DCM mode, the controller can switch
smoothly between CCM and DCM, where converter runs at reduced
switching frequency to achieve much higher efficiency at light load.
The NCP3235 is available in 6 mm x 6 mm QFN−40 pin package.
Features
• Wide Input Voltage Range from 4.5 V to 23 V
• 0.6 V Internal Reference Voltage
• Switching Frequency Option: 550 kHz, 1.1 MHz
• External Programmable Soft−Start
• Lossless Low−side FET Current Sensing
• Output Over−voltage Protection and Under−voltage Protection
• Selective Hiccup/Latch Off Operation for All Faults
• Pre−bias Start−up
• Adjustable Output Voltage
• Power Good Output
• Internal Over−temperature Protection
• Adjustable Input UVLO
• This is a Pb−Free Device
Typical Application
• Industry PC Equipment
• ASIC, FPGA, DSP and CPU Core and I/O Supplies
• Server and Storage System
• Telecom and Network Equipment
www.onsemi.com
1 40
QFN40 6x6, 0.5P
CASE 485CM
MARKING
DIAGRAM
1
NCP3235
AWLYYWWG
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
PIN CONNECTIONS
VIN 11
VIN 12
VIN 13
VIN 14
VSWH 15
PGND 16
PGND 17
PGND 18
PGND 19
PGND 20
VIN
EP42
GND
EP41
VSWH
EP43
40 EN
39 VCC
38 VB
37 AGND
36 BST
35 VSW
34 VSWH
33 VSWH
32 VSWH
31 VSWH
© Semiconductor Components Industries, LLC, 2016
May, 2016 − Rev. 0
(Top View)
ORDERING INFORMATION
Device
Package
NCP3235MNTXG QFN−40
(Pb−Free)
Shipping†
2500 /
Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
1 Publication Order Number:
NCP3235/D
1 page  
NCP3235
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
POWER SUPPLY
VIN/VCC Operation Voltage
VIN/VCC
4.5
VB UVLO Threshold (Rising)
4.2 4.3
VB UVLO Threshold (Falling)
3.8 3.95
VB Output Voltage
VB
VCC = 6 V, 0 ≤ IB ≤ 40 mA
4.86
5.15
VB Dropout voltage
IB = 25 mA, VCC = 4.5 V
65
VCC Quiescent Current
EN=H, COMP=H, no switching;
PG open; no switching
4.7
Shutdown Supply Current
EN=0; Vcc=21 V; PG open
100
EN=0; Vcc=4.5; PG open
75
FEEDBACK VOLTAGE
FB input voltage
VFB TJ = 25°C, 4.5 V ≤ VCC ≤ 21 V 597
600
−40°C ≤ TJ ≤ 125°C;
4.5 V ≤ VCC ≤ 21 V
594 600
Feedback Input Bias Current
IFB VFB = 0.6 V
ERROR AMPLIFIER
Open Loop DC Gain (GBD)
60 85
Open Loop Unity Gain Bandwidth
F0dB,EA
24
Open Loop Phase Margin
60
Slew Rate
COMP pin to GND = 10 pF
2.5
COMP Clamp Voltage, High
3.3
COMP Clamp Voltage, Low
0.57
Output Source Current
VFB = 0.55 V
15
Output Sink Current
VFB = 1 V
20
CURRENT LIMIT
Low−side RDS(on)/ISET
Low−side ISET Current Source
Temperature Coefficient
RDS(on)/
ISET
TC_LS_ISET
Guaranteed by
characterization, TJ = 25°C
108
+0.33
Low−side OCP switch−over threshold
Guaranteed by design
600
Low−side Fixed OCP threshold
LS_OCPth
Guaranteed by design
600
Low−side programmable OCP range
Guaranteed by design
LS OCP Blanking time
LS_Tblnk
Guaranteed by design
150
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
PWM Ramp Amplitude
Guaranteed by characterization VCC/7.9 VCC/6.5
PWM Ramp Offset
0.67
Max
21
4.4
4.0
5.45
120
6.4
140
85
603
606
75
<600
VCC/5.6
Units
V
V
V
V
mV
mA
mA
mA
mV
nA
dB
MHz
deg
V/m
V
V
mA
mA
W/A
%/°C
mV
mV
mV
ns
%
%
ns
V
V
www.onsemi.com
5
5 Page 
NCP3235
TYPICAL CHARACTERISTICS
CH1 (Yellow): COMP
CH2 (Green): VSW
CH3 (Blue): Vout
Figure 26. Stead−state DCM Operation
(load = 0 A), sonic mode (disabled) allows
switching frequency drop to about 100 Hz
CH1 (Yellow): SS pin
CH2 (Green): VSW
CH3 (Blue): Vout
Figure 27. Hiccup in Over Current Protection
www.onsemi.com
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet NCP3235.PDF ] | |
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