NCV97310
Automotive Battery-
Connected Low-Iq Multi-
Output Power Management
Unit with 3 Buck Regulators
Description
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The NCV97310 is a 3−output regulator consisting of a low−Iq
battery−connected 3 A, 2 MHz non−synchronous switcher and two
low−voltage 1.5 A, 2 MHz synchronous switchers; all using integrated
power transistors.
The high−voltage switcher is capable of converting a 4.1 V to 18 V
battery input to a 3.3 V output at a constant 2 MHz switching
frequency, delivering up to 3 A. In overvoltage conditions up to 36 V,
the switching frequency folds back to 1 MHz; in load dump conditions
up to 45 V the regulator shuts down.
The output of the battery−connected buck regulator serves as the low
voltage input for the 2 downstream synchronous switchers. Each
downstream output is adjustable from 1.2 V to 2.8 V, with a 1.5 A
average current limit and a constant 2 MHz switching frequency. Each
switcher has an independent enable and reset pin, giving extra power
management flexibility.
For low−Iq operating mode, the low−voltage switchers are disabled
and the standby rail is supplied by a low−Iq LDO (up to 150 mA) with
a typical Iq of 30
mA.
The LDO regulator is in parallel to the
high−voltage switcher, and is activated when the switcher is forced in
standby mode.
All 3 SMPS outputs use peak current mode control with internal
slope compensation, internally−set soft−start, battery undervoltage
lockout, battery overvoltage protection, cycle−by−cycle current
limiting, hiccup mode short−circuit protection and thermal shutdown.
An error flag is available for diagnostics.
Features
1
32
QFN32
MW SUFFIX
CASE 488AM
MARKING DIAGRAM
1
NCV97310
33
AWLYYWWG
G
A
WL
YY
WW
G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
(Note: Microdot may be in either location)
ORDERING INFORMATION
See detailed ordering, marking and shipping information on
page 20 of this data sheet.
•
Low Quiescent Current in Standby Mode
•
Programmable Spread Spectrum for EMI Reduction
•
2 Microcontroller Enabled Low Voltage Synchronous
•
•
•
•
•
Buck Converters
Large Conversion Ratio of 18 V to 3.3 V Battery
Connected Switcher
Wide Input of 4.1 to 45 V with Undervoltage Lockout
(UVLO)
Fixed Frequency Operation Adjustable from 2.0 to
2.6 MHz
Internal 1.5 ms Soft−starts
Cycle−by−cycle Current Limit Protections
•
•
•
•
Hiccup Overcurrent Protections (OCP)
Individual Reset Pins with Adjustable Delays
QFN Package with Wettable Flanks (pin edge plating)
NCV Prefix for Automotive and Other Applications
Requiring Unique Site and Control Change
Requirements; AEC−Q100 Qualified and PPAP
Capable
•
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Typical Applications
•
Infotainment, Body Electronics, Telematics, ECU
©
Semiconductor Components Industries, LLC, 2016
1
April, 2018 − Rev. 8
Publication Order Number:
NCV97310/D
NCV97310
VDRV
VDRV1
STBYB
VDD
BST1
REGULATOR 1
VBAT
VINL
RSTB
RSTB1
3.3 V
STEP DOWN
SW1
COMP1
NC
LINEAR
EN
Master Enable
REGULATOR
VOUT
GND1
Exposed
Pad
VDRV
VDRV2
BST2
REGULATOR 2
VIN2
1.2 V −−> 2.8 V
STEP DOWN
SW2
FB2
EN2
RSTB
RSTB2
GND2
BST3
REGULATOR 3
VIN3
1.2 V −−> 2.8 V
STEP DOWN
SW3L
FB3
EN3
RSTB
RSTB3
GND3
TEMP
OT
WARNING
VIN_UVLO
VIN_OV
RSTB1
RSTB2
ERRB
RSTB3
ERR
RMOD
RDEPTH
OSC
ROSC
SW3H
Figure 1. NCV97310 Block Diagram
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2
NCV97310
TYPICAL APPLICATION
C OUT1
L1
C
DRV1
C BST2
R
DRV1
32
SW1 VDRV1 BST1 VINL VOUT
VBAT
Exposed
Pad
25
BST2
GND2 24
SW2
VIN2
VIN3
VDRV2
SW3H
SW3L
GND3
EN3
BST3
16
17
V OUT1
D1
C BST1
R FB2D
R FB2U
FB2
NC
C OUT2
V OUT2
V BAT
1
C IN1
EN
STBYB
RDEPTH
L2
RDEPTH
R MOD RMOD
V
OUT1
RSTB1
C DRV2
C IN2
C COMP1 R COMP1 COMP1
ROSC
8
ERRB EN2 RSTB2 GND1 RSTB3 FB3
9
L3
C OUT3
V OUT3
R OSC
R FB3U
C BST3
Figure 2. Typical Application
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NCV97310
Table 1. MAXIMUM RATINGS
Rating
Min/Max Voltage VBAT, VINL
Max Voltage VBAT to SW1
Min/Max Voltage SW1
Min Voltage SW1, SW2, SW3 − 20 ns
Min/Max Voltage BST1, STBYB, EN
Min/Max Voltage VIN2, VIN3, BST2, BST3, SW2, SW3H, SW3L, VOUT
Min/Max Voltage on RSTB2, RSTB3, EN2, EN3, FB2, FB3
Min/Max Voltage on RSTB1, ERRB
Max Voltage BST1 to SW1, BST2 to SW2, BST3 to SW3x
Min/Max Voltage VDRV1, VDRV2, COMP1, ROSC, RMOD, RDEPTH
Thermal Resistance, 5 x 5 QFN Junction – to – Ambient (Note 1)
Storage Temperature Range
Operating Junction Temperature Range
ESD Withstand Voltage
Moisture Sensitivity
Peak Reflow Soldering Temperature
Human Body Model
Machine Model
T
J
V
ESD
MSL
R
θJA
Symbol
Value
−0.3 to 45
45
−0.7 to 40
−3.0
−0.3 to 40
−0.3 to 12
−0.3 to 6
−0.3 to 3.6
3.6
−0.3 to 3.6
25
−55 to +150
−40 to +150
2.0*
200
Level 1
260
°C
Unit
V
V
V
V
V
V
V
V
V
V
°C/W
°C
°C
kV
V
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.
*BST2, BST3 HBM 1.5 kV
Table 2. RECOMMENDED OPERATING CONDITIONS
Rating
VIN Range
Ambient Temperature Range
Value
4.5 V to 36 V
−40°C to 125°C
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
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NCV97310
Table 3. PIN FUNCTION DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Exposed
Pad
Symbol
VBAT
EN
STBYB
RDEPTH
RMOD
RSTB1
COMP1
ROSC
ERRB
EN2
RSTB2
GND1
RSTB3
FB3
EN3
BST3
GND3
SW3L
SW3H
VDRV2
VIN3
VIN2
SW2
GND2
BST2
NC
FB2
VOUT
VINL
BST1
VDRV1
SW1
Description
Input voltage from battery. Place an input filter capacitor in close proximity to this pin. Must be tied to Pin 29 −
VINL.
High−voltage (battery), TTL−compatible, master enable signal. Grounding this input stops all outputs and
reduces Iq to a minimum (shutdown mode).
High−voltage (battery), TTL−compatible, mode selection signal. Grounding this input activates the low−Iq
mode of operation for switcher 1 (standby mode).
Modulation depth adjustment (% of FSW) for spread spectrum. Set with a resistor to GND.
Modulation frequency adjustment for spread spectrum. Set with a resistor to GND.
Reset with adjustable delay. Goes low when the output is out of regulation. When using Low−Iq LDO Mode,
connect a pull−up resistor to a permanent external supply (e.g. V
OUT1
).
Output of the error amplifier for switcher 1
Provides Frequency Adjustment
Error flag combining temperature and input and output voltage sensing
TTL compatible low voltage input. Grounding this input stops switcher 2.
Reset with adjustable delay. Goes low when the output is out of regulation.
Ground reference for the IC.
Reset with adjustable delay. Goes low when the output is out of regulation.
Output voltage sensing, provides adjustability.
TTL compatible low voltage input. Grounding this input stops switcher 3.
Bootstrap input provides drive voltage higher than VIN3 to the high−side N−channel Switch for optimum
switch R
DS(on)
and highest efficiency.
Ground connection for the source of the low−side switch of switcher 3.
Drain of the low−side switch. Connect the output inductor to this pin. Must be tied to SW3H.
Source of the high−side switch. Connect the output inductor to this pin. Must be tied to SW3L.
Internal supply voltage for driving the low−voltage internal switches. Connect a capacitor for noise filtering
purposes.
Low Input voltage for switcher 3. Place an input filter capacitor in close proximity to this pin. Must be
connected to Pin 22 − VIN2 and Pin 28 − VOUT.
Low Input voltage for switcher 2. Place an input filter capacitor in close proximity to this pin. Must be
connected to Pin 21 − VIN3 and Pin 28 − VOUT.
Switching node of the switcher 2 regulator. Connect the output inductor to this pin.
Ground connection for the source of the low−side switch of switcher 2.
Bootstrap input provides drive voltage higher than VIN2 to the high−side N−channel Switch for optimum
switch R
DS(on)
and highest efficiency.
This pin is a no−connect. Leave the pin floating.
Output voltage sensing, provides adjustability.
Output voltage sensing. Delivers the output current in low−Iq mode
Input voltage from battery. Place an input filter capacitor in close proximity to this pin. Must be tied to Pin1 −
VBAT.
Bootstrap input provides drive voltage higher than VBAT to the N−channel Power Switch for optimum switch
Rdson and highest efficiency.
Internal supply voltage for driving the low−voltage internal switch. Connect a capacitor for noise filtering
purposes. (When using Low−Iq LDO Mode, also connect a 100 kW resistor to GND.)
Switching node of the Regulator. Connect the output inductor and cathode of the freewheeling diode to this pin.
Must be connected to GND1 (electrical ground) and to a low thermal resistance path to the ambient
temperature environment.
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