ON Semiconductor NCV97310 User Manual

NCV97310MW50GEVB

NCV97310 Evaluation Board
User'sManual

Description

The NCV97310 is 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 5 V or 3.3 V output at
a constant 2MHz switching frequency, delivering up to 3A.
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 r egulator serves
as the l ow v oltage i nput f or t he 2 s ynchronous s witchers. E ach
downstream output is adjustable from 1.2 V to 3.3 V, with
a 1.5 A current limit and a constant 2 MHz switching
frequency. Each switcher has independent enable and reset
pins, 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.

Key Features

• Low Quiescent Current in Standby Mode

• 2 Microcontroller Enabled Low Voltage Synchronous

• Large Conversion Ratio of 18 V to 3.3 V Battery

• Wide Input of 4.1 to 45 V with Undervoltage Lockout

• Fixed Frequency Operation Adjustable from 2.0 to

• Internal 1.5 ms Soft−starts

• Cycle−by−cycle Current Limit Protections

• Hiccup Overcurrent Protections (OCP)

• Individual Reset Pins with Adjustable Delays

• These Devices are Pb−Free, Halogen Free/BFR Free

Typical Applications

• Infotainment, Body Electronics, Telematics, ECU

http://onsemi.com

EVAL BOARD USER’S MANUAL

Buck Converters

Connected Switcher

(UVLO)

2.6 MHz

and are RoHS Compliant

© Semiconductor Components Industries, LLC, 2014

October, 2014 − Rev. 1

Figure 1. Evaluation Board Photo

1 Publication Order Number:

EVBUM2218/D

NCV97310MW50GEVB

STBYB

VBAT

VINL

RMIN

EN

GND1

VIN2

EN2

VDD

LOGIC

Master Enable

SEL

REGULATOR 1

5V or 3V3

STEP DOWN

LINEAR

REGULATOR

REGULATOR 2

1V2 ... 3V3

STEP DOWN

VDRV

RSTB

VDRV VDRV2

RSTB

VDRV1

BST1

SW1
COMP1

RSTB1

VOUT

BST2

SW2

FB2
RSTB2

VIN3

EN3

REGULATOR 3

1V2...3V3

STEP DOWN

TEMP

OT

WARNING

VIN_UVLO

VIN_OV

RSTB1
RSTB2
RSTB3

ERR

Figure 2. NCV97310 Block Diagram

RSTB

OSC

GND2

BST3

SW3H
SW3L

FB3
RSTB3

GND3

ROSC

RMOD
RDEPTH

ERRB

http://onsemi.com

2

NCV97310MW50GEVB

TYPICAL APPLICATION

C

OUT1

L

C

D

1

V

BAT

C

IN1

1

EN

STBYB

BST1

32 25

VBAT

1

C

DRV1

R

FB2D

R

MIN

RMINSW1 VDRV1 BST1 VINL VOUT FB2 BST2

GND2

C

24

SW2

VIN2

BST2

C

R

FB2U

OUT2

L

2

V

OUT1

V

OUT2

MOD

RDEPTH

RMOD

RSTB1

COMP1

ROSC

8

ERRB EN2 RSTB2 GND1 RSTB3 FB3 EN3 BST3

9 16

C

COMP1

R

DEPTH

R

R

COMP1

OSC

R

Table 1. EVALUATION BOARD TERMINALS

Pin Name Function

VBAT Positive dc input voltage

GND Common dc return
VOUT1 Positive 5.0 V dc output voltage (LDO / switcher 1)
VOUT2 Positive DC output voltage (switcher 2)
VOUT3 Positive DC output voltage (switcher 3)

EN Master enable input. Includes jumper J3 to connect to VBAT.

STBYB Standby enable input. Includes jumper J4 to connect to VBAT.

EN2 Switcher 2 enable input. Includes jumper J6 to connect to VOUT1.
EN3 Switcher 3 enable input. Includes jumper J5 to connect to VOUT1.

ERRB
RST1B Reset with adjustable delay. Goes low when the VOUT1 is out of regulation.
RST2B Reset with adjustable delay. Goes low when the VOUT2 is out of regulation.
RST3B Reset with adjustable delay. Goes low when the VOUT3 is out of regulation.

Error flag combining temperature and input and output voltage sensing.

Figure 3. Typical Application

VIN3

VDRV2

SW3H

SW3L

GND3

17

C

BST3

C

DRV2

L

C

3

OUT3

R

FB3U

C

IN2

V

OUT3

http://onsemi.com

3

NCV97310MW50GEVB

Table 2. ABSOLUTE MAXIMUM RATINGS (Voltages are with respect to GND)

Rating

Dc Supply Voltage (VBAT, EN, STBYB) −0.3 to 36 V
Dc Supply Voltage (VIN2, VIN3) −0.3 to 12 V
Dc Supply Voltage (RSTB1, RSTB2,

RSTB3, ERRB, EN2, EN3)
Storage Temperature Range −55 to 150 °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.

Value Unit

−0.3 to 6 V

Table 3. ELECTRICAL CHARACTERSITICS (T

Characteristic

= 25°C, 4.5 ≤ VIN ≤ 18 V, IOUT ≤ 2 A, unless otherwise specified)

A

Conditions Typical Value Unit

REGULATION

Output Voltage (VOUT1)

5.0 V
Output Voltage (VOUT2) 3.3 V
Output Voltage (VOUT3) 1.2 V
Line Regulation (VOUT1) I
Line Regulation (VOUT2) I
Line Regulation (VOUT3) I
Load Regulation (VOUT1) V
Load Regulation (VOUT2) V
Load Regulation (VOUT3) V

= 1.0 A 0.03 %

OUT1

= 1.0 A 0.01 %

OUT2

= 1.0 A 0.001 %

OUT3

= 13.2 V 0.3 %

BAT

= 13.2 V 0.02 %

BAT

= 13.2 V 0.03 %

BAT

SWITCHING

Switching Frequency

2.0 MHz
Soft−start Time 1.4 ms
R

Frequency Range

OSC

50 kW ≥ R

OSC

≥ 10 kW

2.0 to 2.6 MHz

CURRENT LIMIT

Peak Current Limit (VOUT1)

STBYB = 0 V 0.2 A
Peak Current Limit (VOUT1) STBYB = 5 V 4.4 A
Peak Current Limit (VOUT2) 2.9 A
Peak Current Limit (VOUT3) 2.9 A

PROTECTION

V

Input Undervoltage Lockout (UVLO)
Input Overvoltage Protection V

Decreasing 3.9 V

BAT

Increasing 36 V

BAT

Thermal Warning TJ Rising 150 °C
Thermal Shutdown TJ Rising 170 °C

Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.

http://onsemi.com

4

VOUT1

VOUT1

(5.0 V)

1

VOUT1

CO15

VIN2

CO14

VIN2

GND1

1

Place close

to VIN2

4.7 uF

Place close

to VIN2

1 uF

NCV97310MW50GEVB

VOUT2

GND2

VOUT3

VOUT3

1

(1.2 V)

COUT32

COUT31

1

1

VOUT2

(3.3 V)

COUT22

10 uF

VOUT2

VIN2

COUT21

R7

0.0

10 uF

10 uF

10 uF

VOUT3

GND3

1

SW1

COUT13

10 uF

COUT12

10 uF

0.1 uF

DRV1

VIND

10K

BST2

0.1 uF

C3

VBAT_IC

CIN4

CIN3

CIN2

CIN1

CBST2

33

25
26
27
28
29
30
31
32

U1

J2

J1

2.2 uF

1 uF

4.7 uF

4.7 uF

COUT11

10 uF

100

RMIN3

100

RMIN2

100

RMIN1

L1

4.7 uH

SW1

D1

RMIN

NRVB440MFS

C1

RFB2L

5.76K

R1

RMIN

CBST1

100 pF

0.0

FB2

50V

0.1 uF

RFB2U

FB2

CDRV1

CSNB2

100 pF

L2 2.2 uH

RSNB2

10.0

SW2

0.1 uF

FB2

1 2

1 2

24

BST2
RMIN

VINL

BST1

SW1

EPAD

VOUT

VIN2

SW2

23

22

SW2

EN

EN

STBYB

STBYB

VIN321VIN2

TP1

RDEPTH

DNP

VOUT1

NCV97310MW50R2G

TP2

GND2

VDRV1

VBAT1EN2STBY3RDEPTH4RMOD5RST16COMP17ROSC

CDRV2

0.47 uF

20

VDRV2

RMOD

DNP

SW3

19

SW3H

RST1B

R3

SW3

18

SW3L

COMP1

10K

CSNB3

L3 1.0 uH

RSNB3

17

8

ROSC

COMP1

100 pF

10.0

GND3

TP3

RCOMP1

12.4K

CBST3

0.1 uF

BST3
EN3
FB3
RST3
GND1
RST2
EN2
ERR

9

ROSC

CCOMP2

VOUT1

VOUT1

J3

EN3

BST3

16
15
14
13
12
11
10

GND

DNP

CCOMP1

22 pF

1 2

EN3

FB3

Place GND near

330 pF

R4

10K

C2

10K

RFB3U

R2

FB3

RFB3L

DNP

ERRB for logic

reference.

VOUT1

ERRB

ERRB

R5

10K

VOUT1

VOUT1

100 pF

0.0

EN2

J4

1 2

R6

10K

EN2

RST2B

RST2B

RST3B

RST3B

Figure 4. NCV97310GEVB 5.0 V Board Schematic

Place CIN0, L0, CIN1, CIN2 on VBAT side.

Place CIN3 close to VINL (pin 29)

CIN5

Place CIN4 close to VBAT (pin 1)

L0

1.0 uH
CIN0

VBAT

VBAT_1

1

100 uF

4.7 uF

VBAT

Place CIN5 on

bottom of PCB

1

GND0

http://onsemi.com

5

RST1B