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NCV8851B 데이터시트 PDF




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부품번호 NCV8851B 기능
기능 Automotive Grade Synchronous Buck Controller
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NCV8851B 데이터시트, 핀배열, 회로
NCV8851B
Automotive Grade
Synchronous Buck
Controller
The NCV8851B is an adjustable output, synchronous buck
controller, which drives dual Nchannel MOSFETs, ideal for high
power applications. Average current mode control is employed for
very fast transient response and tight regulation over wide input
voltage and output load ranges. The IC incorporates an internal fixed
6.0 V lowdropout linear regulator (LDO), which supplies charge to
the switch mode power supply’s (SMPS) bottom gate driver, limiting
the power lost to excess gate drive. The IC is designed for operation
over a wide input voltage range (4.5 V to 40 V) and is capable of 10 to
1 voltage conversion at 500 kHz.
Additional controller features include undervoltage lockout,
internal soft start, low quiescent current sleep mode, programmable
frequency, SYNC function, average current limiting, cyclebycycle
overcurrent protection and thermal shutdown.
Features
Average Current Mode Control
0.8 V ±2% Reference Voltage
Wide Input Voltage Range of 4.5 V to 40 V
Operates through Load Dump Conditions
6.0 V Lowdropout Linear Regulator (LDO)
Input UVLO (Undervoltage Lockout)
Internal Softstart
1.0 mA Maximum Quiescent Current in Sleep Mode
Adaptive Nonoverlap Circuitry
150 ns Minimum Highside Gate Offtime
Programmable Fixed Frequency – 170 kHz to 500 kHz
External Clock Synchronization up to 600 kHz
Average Current Limiting (ACL)
CyclebyCycle Overcurrent Protection (OCP)
Thermal Shutdown (TSD)
This is a PbFree Device
www.DataSheet.co.kr
Applications
Automotive Systems Requiring High Current
Preregulated Supply for Lowvoltage SMPSs and LDOs
http://onsemi.com
TSSOP20
SUFFIX DB
CASE 948E
MARKING DIAGRAM
NCV
8851B
ALYWG
G
NCV8851B = Specific Device Code
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
Device
Package
Shipping
NCV8851BDBR2G TSSOP20 2500/Tape & Reel
(PbFree)
†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.
© Semiconductor Components Industries, LLC, 2010
June, 2010 Rev. 1
1
Publication Order Number:
NCV8851B/D
Datasheet pdf - http://www.DataSheet4U.net/




NCV8851B pdf, 반도체, 판매, 대치품
NCV8851B
ATTRIBUTES
Characteristic
ESD Capability
Human Body Model (Boost, VIN_CS)
Human Body Model (All Others)
Machine Model
Charge Device Model
Package Thermal Resistance
Junction–to–Ambient, RqJA (Note 1)
Junction–to–Ambient, RqJA (Note 2)
1. 50 mm2, 1.0 oz copper on FR4 board.
2. 500 mm2, 1.0 oz copper on FR4 board.
ELECTRICAL CHARACTERISTICS
(40°C < TJ < 150°C, 4.5 V < VIN < 40 V, 4.5 V < BST < 46 V, ROSC = 51.1 kW, unless otherwise specified)
Characteristic
Conditions
Min
Typ
GENERAL
Quiescent Current
(IVIN + IVIN_CS + IBST)
VIN = 13.2 V, EN = 0 V, Sleep Mode
40°C < TA < 125°C
VIN = 13.2 V, VFB = 1 V
EN = 5 V, No Switching
−−
2.0
VIN = 13.2 V, VFB = 0 V
EN = 5 V, Switching
3.2
LDO Current
VIN = 13.2 V, VFB = 0 V, EN = 5 V
Switching, 3.3 nF on GH and GL
10
Thermal Shutdown
Guaranteed by Design
150 180
Thermal Shutdown Hysteresis
Guaranteed by Design
10
Undervoltage Lockout (VIN_IC)
Undervoltage Lockout Hysteresis
VIN_IC increasingwww.DataSheet.co.kr
4.1 4.3
50 125
SWITCHING REGULATOR
Reference Voltage
0.784
0.8
Minimum GH Off Time
80 150
Minimum GH Pulse Width
Static Operating
140
OSCILLATOR
Switching Frequency
Ramp Voltage Amplitude
ROSC = 51.1 kW
ROSC = 23.2 kW
ROSC = 16.2 kW
153 170
306 360
425 500
0.9 1.1
VOLTAGE ERROR AMPLIFIER
DC Gain
Guaranteed by Design
70 73
GainBandwidth Product
Guaranteed by Design
8.0 10
Charge Currents
FB Bias Current
Source, VCOMP = 0 V
Sink, VCOMP = 1.75 V
Guaranteed by Design
24
1.3 3
0.1
CURRENT SENSE AMPLIFIER
CommonMode Range
1.2
Amplifier Gain
0 (CSPCSN) 100 mV
1.2 V CSN 10.0 V
1
Value
1.0 kV
1.5 kV
200 V
1.0 kV
156°C/W
108°C/W
Max
1
3.0
5.0
20
210
20
4.5
200
0.816
220
200
187
414
575
1.3
1.0
10.0
Unit
mA
mA
mA
mA
°C
°C
V
mV
V
ns
ns
kHz
kHz
kHz
V
dB
MHz
mA
mA
mA
V
V/V
http://onsemi.com
4
Datasheet pdf - http://www.DataSheet4U.net/

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NCV8851B 전자부품, 판매, 대치품
NCV8851B
TYPICAL CHARACTERISTICS
(TA = +25°C, VIN = 13.2 V, ROSC = 51.1 kW, unless otherwise noted)
102%
170 kHz 360 kHz 500 kHz
101%
100%
99%
98%
97%
96%
50
0 50 100
Ambient Temperature (°C)
150
Figure 12. Oscillator Frequency
vs. Temperature
70 GH to GL GL to GH
65
60
55
50
45
40
35
30
25
20
50
0 50 100
Ambient Temperature (°C)
150
Figure 13. NonOverlap Delay vs.
Temperature
108%
106%
104%
102%
100%
98%
50
0 50 100
Ambient Temperature (°C)
150
Figure 14. GH Minimum Pulse
Width vs. Temperature
100.50%
100.25%
100.00%
99.75%
99.50%
0.00
5.00
10.00
15.00
LDO Load Current (mA)
20.00
Figure 15. LDO Load Regulation
1000
UNSTABLE
130
120
100 110
STABLE
10
100
90
80
1 70
UNSTABLE
www.DataSheet.co.kr
(0.1uF only)
60
0.1
0
5 10 15
LDO Load Current (mA)
50
20 50
0 50 100
Ambient Temperature (°C)
150
Figure 16. LDO Stability Region
Figure 17. LDO Dropout Voltage vs.
Temperature
100
93%
80
60
40
20
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
Load Current (A)
Figure 18. Efficiency vs. Load Cur-
rent 5 V, 170 kHz Demo Board
http://onsemi.com
7
Datasheet pdf - http://www.DataSheet4U.net/

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