NCV97200
Power Management (PMIC)
- Automotive, Multi-Output,
Safety Applications
Description
The NCV97200 is a 2−output monolithic regulator consisting of
1 buck regulator and 1 boost regulator with supervisory functions
including window voltage monitoring on all outputs and a window
watchdog. This product is ideal for ADAS (Advanced Driver
Assistance Systems) applications and utilizes an independent voltage
reference and an adjustable independent oscillator to realize the
supervisory features.
A 40 V non−synchronous buck regulator converts the battery supply
voltage to a 3.3 V output, and delivers up to 3 A (peak). This output
rail may be used as the low voltage input voltage for the
non−synchronous secondary boost converter. The secondary boost is
fixed and is intended to supply a low current 5.0 V rail for In−Vehicle
Networking circuits (IVN).
All internal MOSFETs are N−channel devices, and a bootstrap
circuit is used to drive the buck high−side MOSFET. Both SMPS
outputs use peak current mode control with internal slope
compensation. The IC incorporates an internal regulator that supplies
charge to the low−voltage gate drivers.
The NCV97200 is a functional safety solution that reduces the time
required to develop safety systems that comply with the International
Standards Organization (ISO) 26262. The device includes a range of
integrated safety features such as dedicated feedback references,
output voltage monitoring, and window watchdog.
Features
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QFNW20
MW SUFFIX
CASE 484AD
MARKING DIAGRAM
1
97200
XX
ALYWG
G
= Specific Device Code
= 01 or 33
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
97200
XX
A
L
Y
W
G
(Note: Microdot may be in either location)
SAFETY DESIGN – ASIL B
•
•
•
•
•
•
•
•
•
1 Enabled Buck Converter
1 Boost Converter for IVN Supply
Wide Input of 4.1 to 40 V with Undervoltage Lockout (UVLO)
Fixed Frequency Operation at 2 MHz
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
Window Watchdog with Independent References
page 21 of this data sheet.
Cycle−by−cycle Current Limit Protection
External Frequency Synchronization
Typical Applications
Pseudo−random Spread Spectrum for Improved EMI
•
Safety Applications
Option for Switcher Shutdown upon Watchdog Fault
•
ADAS (Advanced Driver Assistance Systems)
(controlled by part number)
•
Body Electronics
•
NCV Prefix for Automotive and Other Applications
Requiring Unique Site and Control Change
•
Telematics
Requirements; AEC−Q100 Qualified and PPAP
Capable
ASIL B Product developed in compliance with
ISO 26262 for which a complete safety
package is available.
©
Semiconductor Components Industries, LLC, 2017
October, 2019
−
Rev. 4
1
Publication Order Number:
NCV97200/D
NCV97200
LINEAR
REGULATOR
VBAT
COMP1
REGULATOR 1
3.3 VOLT
STEP DOWN
RESET
LOGIC
WINDOW
WATCHDOG
WATCHDOG
OSCILLATOR
REGULATOR 2
5.0 VOLT
BOOST
OUTPUT
MONITOR
SW2
GND2
VOUT2
OUTPUT
MONITOR
VDRV1
BST1
SW1
VOUT1
RSTB1
WDI
WDT
EN
RSTB2
EN DELAY
TIMER
TSD
VIN_UVLO
VIN_OV
RSTB_VM
VBAT
MAIN
OSCILLATOR
VOUT_PD
FAULT
LOGIC
VOLTAGE
MONITOR
FB_VM
SYNCI
GND1
SPREAD
SPECTRUM
SYNCO
Figure 1. NCV97200 Block Diagram
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2
NCV97200
TYPICAL APPLICATION
L
1
D
1
C
OUT1
L
2
C
BST
D
2
C
OUT2
C
DRV
V
BAT
C
IN
VBAT
20
SW1
BST1
VDRV1
SW2
16
GND2
VOUT2
15
NCV97200
VOUT1
V
OUT1
V
OUT2
1
EN
SYNCI
FB_VM
R
RSTB2
SYNCO
RSTB2
VOUTPD
5
WDI
11
WDT
R
PD
C
WDT
6
COMP1 GND1 RSTB_VM RSTB1
10
R
RSTB1
To
mController
R
COMP
C
COMP
R
RSTBVM
Figure 2. NCV97200 Typical Application
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NCV97200
Table 1. MAXIMUM RATINGS
Rating
Min/Max Voltage VBAT
Max Voltage VBAT to SW1 and VBAT to GND
−
peak voltage during load dump
Min/Max Voltage SW1
Min Voltage SW1, SW2
−
20 ns
Min/Max Voltage BST1, EN
Min/Max Voltage SW2
Min/Max Voltage on WDI, SYNCI, SYNCO, VOUT2, RSTB1, RSTB2, RSTB_VM, VOUT_PD
Max Voltage BST1 to SW1
Min/Max Voltage FB_VM, VDRV1, COMP1, WDT, VOUT1
Thermal Resistance, 4x4 QFN Junction–to–Ambient (Note 1)
Storage Temperature range
Operating Junction Temperature Range
ESD withstand Voltage (Human Body Model)
Moisture Sensitivity
Peak Reflow Soldering Temperature
T
J
V
ESD
MSL
R
θJA
Symbol
Value
−0.3
to 40
45
−0.7
to 40
−3.0
−0.3
to 40
−0.3
to 7.2
−0.3
to 6
3.6
−0.3
to 3.6
39
−55
to +150
−40
to +150
2.0
Level 1
260
°C
Unit
V
V
V
V
V
V
V
V
V
°C/W
°C
°C
kV
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.
1. Mounted on 1 sq. in. of a 4−layer PCB with 1 oz. copper thickness.
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NCV97200
Table 2. PIN FUNCTION DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
Symbol
VBAT
EN
SYNCI
SYNCO
VOUT_PD
WDT
COMP1
GND1
RSTB_VM
RSTB1
Description
Input voltage from battery. Place an input filter capacitor in close proximity to this pin.
High−voltage (battery), TTL−compatible, master enable signal. Grounding this input stops all outputs and
reduces Iq to a minimum (shutdown mode).
Synchronization input. Connecting an external clock to the SYNCI pin synchronizes switching to the rising
edge of the SYNCI voltage. If unused, the SYNCI pin should be grounded.
Synchronization output pin. If unused, the SYNCO pin should have no connection.
Internal pull−down circuit
−
active during Enable delay time. Connect to GND when not used.
Watchdog delay programming. Connect a capacitor between this pin and ground to adjust the watchdog
window time.
Output of the error amplifier for switcher 1
Ground reference for the IC.
External voltage monitor reset output with adjustable delay. Goes low when the FB_VM for the external
supply is out of regulation. If unused, the RSTB_VM pin should have no connection.
Switcher 1 voltage monitor reset output with adjustable delay. Goes low when the output is out of regulation
and when a watchdog pulse is not received from the microcontroller. If unused, the RSTB1 pin should have
no connection.
CMOS compatible Watchdog pulse input from a CPU. To be valid, the time between rising edges of this
signal must be between the watchdog window time.
Switcher 2 voltage monitor reset output with adjustable delay. Goes low when the output is out of regulation.
If unused, the RSTB2 pin should have no connection.
Input for the external voltage monitor. Connect to external voltage reference through resistor divider.
If unused, the FB_VM pin should be grounded.
Output voltage sensing for switcher 1.
Output voltage sensing for switcher 2.
Ground connection for the source of the low−side switch of switcher 2.
Switching node of the switcher 2 boost regulator. Connect the output inductor to this pin.
Internal supply voltage for driving the low−voltage internal switch. Connect a 0.1
mF
to 1.0
mF
capacitor for
noise filtering purposes.
Bootstrap input provides drive voltage higher than VBAT to the N−channel Power Switch for optimum switch
R
DS(on)
and highest efficiency.
Switching node of the switcher 1 buck regulator. Connect the output inductor and cathode of the freewheel-
ing diode to this pin.
Must be connected to GND1 (electrical ground) and to a low thermal resistance path to the ambient tem-
perature environment.
11
12
13
14
15
16
17
18
19
20
Exposed
Pad
WDI
RSTB2
FB_VM
VOUT1
VOUT2
GND2
SW2
VDRV1
BST1
SW1
EP
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