NCV8871 Datasheet PDF - ON Semiconductor

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NCV8871
ON Semiconductor

Part Number NCV8871
Description Automotive Grade Non-Synchronous Boost Controller
Page 17 Pages


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NCV8871
Automotive Grade
Non-Synchronous Boost
Controller
The NCV8871 is an adjustable output nonsynchronous boost
controller which drives an external Nchannel MOSFET. The device
uses peak current mode control with internal slope compensation. The
IC incorporates an internal regulator that supplies charge to the gate
driver.
Protection features include internallyset softstart, undervoltage
lockout, cyclebycycle current limiting, hiccupmode shortcircuit
protection and thermal shutdown.
Additional features include low quiescent current sleep mode and
externallysynchronizable switching frequency.
Features
Peak Current Mode Control with Internal Slope Compensation
1.2 V ±2% Reference voltage
Fixed Frequency Operation
Wide Input Voltage Range of 3.2 V to 40 Vdc, 45 V Load Dump
Input Undervoltage Lockout (UVLO)
Internal SoftStart
Low Quiescent Current in Sleep Mode
CyclebyCycle Current Limit Protection
HiccupMode Overcurrent Protection (OCP)
HiccupMode ShortCircuit Protection (SCP)
Thermal Shutdown (TSD)
This is a PbFree Device
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8
1
SOIC8
D SUFFIX
CASE 751
MARKING
DIAGRAM
8
8871xx
ALYW
G
1
8871xx = Specific Device Code
xx = 00, 01, 02, 03, 04
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = PbFree Package
PIN CONNECTIONS
EN/SYNC 1
ISNS 2
GND 3
GDRV 4
8 VFB
7 VC
6 VIN
5 VDRV
(Top View)
ORDERING INFORMATION
Device
Package
NCV887100D1R2G SOIC8
(PbFree)
Shipping
2500 / Tape &
Reel
NCV887101D1R2G SOIC8 2500 / Tape &
(PbFree)
Reel
NCV887102D1R2G SOIC8 2500 / Tape &
(PbFree)
Reel
NCV887103D1R2G SOIC8 2500 / Tape &
(PbFree)
Reel
NCV887104D1R2G SOIC8 2500 / Tape &
(PbFree)
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.
© Semiconductor Components Industries, LLC, 2016
August, 2016 Rev. 12
1
Publication Order Number:
NCV8871/D



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NCV8871
EN/
SYNC
EN/SYNC 1
VC 7
RC
CC
TEMP
OSC
SC
FAULT
LOGIC
CLK
DRIVE
LOGIC
VDRV
CL CSA
+
SCP
Gm
SS
Vref
6 VIN
CDRV
5 VDRV
L
D
4 GDRV
Q
2 ISNS
3 GND
RSNS
8 VFB
RF1
RF2
Figure 1. Simplified Block Diagram and Application Schematic
Vg
Cg
Vo
Co
PACKAGE PIN DESCRIPTIONS
Pin No.
Pin
Symbol
Function
1 EN/SYNC Enable and synchronization input. The falling edge synchronizes the internal oscillator. The part is disabled
into sleep mode when this pin is brought low for longer than the enable timeout period.
2
ISNS
Current sense input. Connect this pin to the source of the external NMOSFET, through a currentsense
resistor to ground to sense the switching current for regulation and current limiting.
3
GND
Ground reference.
4
GDRV
Gate driver output. Connect to gate of the external NMOSFET. A series resistance can be added from
GDRV to the gate to tailor EMC performance. An RGND = 15 kW (typical) GDRVGND resistor is strongly
recommended.
5
VDRV
Driving voltage. Internallyregulated supply for driving the external NMOSFET, sourced from VIN. Bypass
with a 1.0 mF ceramic capacitor to ground.
6 VIN Input voltage. If bootstrapping operation is desired, connect a diode from the input supply to VIN, in addi-
tion to a diode from the output voltage to VDRV and/or VIN.
7 VC Output of the voltage error amplifier. An external compensator network from VC to GND is used to stabilize
the converter.
8 VFB Output voltage feedback. A resistor from the output voltage to VFB with another resistor from VFB to GND
creates a voltage divider for regulation and programming of the output voltage.
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NCV8871
ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND, unless otherwise indicated)
Rating
Value
Unit
Dc Supply Voltage (VIN)
0.3 to 40
V
Peak Transient Voltage (Load Dump on VIN)
45 V
Dc Supply Voltage (VDRV, GDRV)
12 V
Peak Transient Voltage (VFB)
0.3 to 6
V
Dc Voltage (VC, VFB, ISNS)
0.3 to 3.6
V
Dc Voltage (EN/SYNC)
0.3 to 6
V
Dc Voltage Stress (VIN VDRV)*
0.7 to 45
V
Operating Junction Temperature
40 to 150
°C
Storage Temperature Range
65 to 150
°C
Peak Reflow Soldering Temperature: PbFree, 60 to 150 seconds at 217°C
265 peak
°C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
*An external diode from the input to the VIN pin is required if bootstrapping VDRV and VIN off of the output voltage.
PACKAGE CAPABILITIES
ESD Capability (All Pins)
Characteristic
Moisture Sensitivity Level
Package Thermal Resistance
1. 1 in2, 1 oz copper area used for heatsinking.
Human Body Model
Machine Model
JunctiontoAmbient, RqJA (Note 1)
Value
w2.0
w200
1
100
Unit
kV
V
°C/W
Device Variations
The NCV8871 features several variants to better fit a
multitude of applications. The table below shows the typical
values of parameters for the parts that are currently
available.
TYPICAL VALUES
Part No.
NCV887100
Dmax
88%
NCV887101
86%
NCV887102
91%
NCV887103
93%
NCV887104
93%
fs
170 kHz
1000 kHz
1000 kHz
340 kHz
340 kHz
tss
7.4 ms
1.25 ms
1.25 ms
3.7 ms
3.7 ms
Sa
53 mV/ms
16 mV/ms
53 mV/ms
53 mV/ms
53 mV/ms
Vcl
400 mV
400 mV
400 mV
200 mV
200 mV
Isrc
800 mA
575 mA
800 mA
575 mA
800 mA
Isink
600 mA
350 mA
600 mA
350 mA
600 mA
VDRV
10.5 V
6.3 V
6.3 V
8.4 V
8.4 V
SCE
Y
Y
N
Y
N
DEFINITIONS
Symbol
Characteristic
Dmax
Sa
Isink
Maximum Duty Cycle
Slope Compensating Ramp
Gate Drive Sinking Current
Symbol
fs
Vcl
VDRV
Characteristic
Switching Frequency
Current Limit Trip Voltage
Drive Voltage
Symbol
tss
Isrc
SCE
Characteristic
SoftStart Time
Gate Drive Sourcing Current
Short Circuit Enable
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NCV8871
ELECTRICAL CHARACTERISTICS (40°C < TJ < 150°C, 3.2 V < VIN < 40 V, unless otherwise specified) Min/Max values are
guaranteed by test, design or statistical correlation.
Characteristic
Symbol
Conditions
Min Typ Max Unit
GENERAL
Quiescent Current, Sleep Mode
Quiescent Current, Sleep Mode
Quiescent Current, No switching
Quiescent Current, Switching,
normal operation
Iq,sleep
Iq,sleep
Iq,off
Iq,on
VIN = 13.2 V, EN = 0, TJ = 25°C
VIN = 13.2 V, EN = 0, 40°C < TJ < 125°C
Into VIN pin, EN = 1, No switching
Into VIN pin, EN = 1, Switching
2.0
mA
2.0 6.0 mA
1.5 2.5 mA
3.0 6.0 mA
OSCILLATOR
Minimum pulse width
Maximum duty cycle
ton,min
Dmax
NCV887100
NCV887101
NCV887102
NCV887103
NCV887104
90 115 140
86 88 90
84 86 88
89 91 93
91 93 95
91 93 95
ns
%
Switching frequency
fs NCV887100
NCV887101
NCV887102
NCV887103
NCV887104
153 170 187
900 1000 1100
900 1000 1100
306 340 374
306 340 374
kHz
Softstart time
tss From start of switching with VFB = 0 until
ms
reference voltage = VREF
NCV887100
6.0 7.4 8.8
NCV887101
1.0 1.25 1.5
NCV887102
1.0 1.25 1.5
NCV887103
3.0 3.7 4.4
NCV887104
3.0 3.7 4.4
Softstart delay
Slope compensating ramp
tss,dly
Sa
From EN 1 until start of switching with
VFB = 0
NCV887100
NCV887101
NCV887102
NCV887103
NCV887104
ms
240 280
46 53 60 mV/ms
13 16 19
46 53 60
46 53 60
46 53 60
ENABLE/SYNCHRONIZATION
EN/SYNC pulldown current
EN/SYNC input high voltage
EN/SYNC input low voltage
EN/SYNC timeout ratio
IEN/SYNC
VEN/SYNC = 5 V
5.0 10
mA
Vs,ih
2.0 5.0
V
Vs,il 0 800 mV
%ten
From SYNC falling edge, to oscillator con-
trol (EN high) or shutdown (EN low), Per-
cent of typical switching period
350
%
SYNC minimum frequency ratio
SYNC maximum frequency
Synchronization delay
%fsync,min
fsync,max
ts,dly
Percent of fs
From SYNC falling edge to GDRV falling
edge under open loop conditions
− − 80 %
1.1
MHz
50 100 ns
Synchronization duty cycle
CURRENT SENSE AMPLIFIER
Dsync
25 75 %
Lowfrequency gain
Bandwidth
ISNS input bias current
Acsa
BWcsa
Isns,bias
Inputtooutput gain at dc, ISNS v 1 V
Gain of Acsa 3 dB
Out of ISNS pin
0.9 1.0 1.1
V/V
2.5
MHz
30 50 mA
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