ON Semiconductor NCV891330 Users Guide

NCV891330

Step-Down Regulator Automotive, Low-Iq, Dual-Mode

3 A, 2 MHz

The NCV891330 is a Dual Mode regulator intended for Automotive, battery−connected applications that must operate with up to a 45 V input supply. Depending on the output load, it operates either as a PWM Buck Converter or as a Low Drop−Out Linear Regulator, and is suitable for systems with low noise and Low Quiescent Current requirements often encountered in automotive driver information systems. A reset pin (with fixed delay) simplifies interfacing with a microcontroller.

The NCV891330 also provides several protection features expected in automotive power supply systems such as current limit, short circuit protection, and thermal shutdown. In addition, the high switching frequency produces low output voltage ripple even when using small inductor values and an all−ceramic output filter capacitor – forming a space−efficient switching regulator solution.

Features

• 30 mA Iq in Light Load Condition

• 3.0 A Maximum Output Current in PWM Mode

• Internal N−channel Power Switch

• V

Operating Range 3.7 V to 36 V

IN

• Withstands Load Dump to 45 V

• Logic Level Enable Pin can be Tied to Battery

• Fixed Output Voltage of 5.0 V, 4.0 V, 3.8 V or 3.3 V

• 2 MHz Free−running Switching Frequency

• ±2 % Output Voltage Accuracy

• NCV Prefix for Automotive Requiring Site and Control Changes

• These Devices are Pb−Free and are RoHS Compliant

Typical Applications

• Audio

• Infotainment

• Instrumentation

• Safety−Vision Systems

VIN

CIN

RESET

NCV891330

VIN

DRV

RSTB

GND EN

SW

BST

VOUT

CDRV

CBST

DBST

EN

DFW

L1

VOUT

COUT

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1

SOIC−8

EXPOSED PAD

CASE 751AC

MARKING DIAGRAM

8

891330XX

ALYW

G

1

With XX = 33 for 3.3 V Output

A = Assembly Location L = Wafer Lot Y = Year W = Work Week G = Pb−Free Device

VIN

DRV

RSTB

GND

ORDERING INFORMATION

See detailed ordering and shipping information on page 15 of this data sheet.

= 38 for 3.8 V Output = 40 for 4.0 V Output = 50 for 5.0 V Output

PIN CONNECTIONS

1

2

3

4

(Top View)

8

7

6

5

SW

BST

VOUT

EN

Figure 1. Typical Application

August, 2019 − Rev. 3

1 Publication Order Number:

NCV891330/D

NCV891330

CDRV

DBST

VIN VOUT

VIN

SW

L1

CIN

RESET

DRV

RSTB

GND

3.3 V Reg

VOLTAGES MONITORS

SELECTION

Low

Oscillator

Enable

comp

TSD

MODE

NCV891330

+

S

3A

detector

Soft−Start

RESET

Switcher Supply

ON

PWM

LOGIC

ON

OFF

+

−

+

LINEAR

REGULATOR

ON

Logic

Figure 2. Simplified Block Diagram

+

OVLD

EN

DFW

COUT

CBST

BST

VOUT

EN

−

+

Table 1. PIN FUNCTION DESCRIPTION

Pin No. Pin Name Description

1 VIN Input voltage from battery. Place an input filter capacitor in close proximity to this pin.

2 DRV Output voltage to provide a regulated voltage to the Power Switch gate driver.

3 RSTB Reset function. Open drain output, pulling down to ground when the output voltage is out of regulation.

4 GND Battery return, and output voltage ground reference.

5 EN This TTL compatible Enable input allows the direct connection of Battery as the enable signal. Grounding

6 VOUT Output voltage feedback and LDO output. Feedback of output voltage used for regulation, as well as LDO

7 BST Bootstrap input provides drive voltage higher than VIN to the N−channel Power Switch for minimum

8 SW Switching node of the Regulator. Connect the output inductor and cathode of the freewheeling diode to

EPAD Connect to Pin 4 (electrical ground) and to a low thermal resistance path to the ambient temperature

this input stops switching and reduces quiescent current draw to a minimum.

output in LDO mode.

switch Rdson and highest efficiency.

this pin.

environment.

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NCV891330

Table 2. ABSOLUTE MAXIMUM RATINGS

Rating Symbol Value Unit

Min/Max Voltage VIN −0.3 to 45 V

Max Voltage VIN to SW 45 V

Min/Max Voltage SW −0.7 to 40 V

Min Voltage SW − 20 ns −3.0 V

Min/Max Voltage EN −0.3 to 40 V

Min/Max Voltage BST −0.3 to 43 V

Min/Max Voltage BST to SW −0.3 to 3.6 V

Min/Max Voltage on RSTB −0.3 to 6 V

Min/Max Voltage VOUT −0.3 to 18 V

Min/Max Voltage DRV −0.3 to 3.6 V

Thermal Resistance, SOIC8−EP Junction–to–Ambient (Note 1) R

θ

JA

Storage Temperature range −55 to +150 °C

Operating Junction Temperature Range T

J

ESD withstand Voltage (Note 2) Human Body Model VESD 2.0 kV

Moisture Sensitivity MSL Level 2

Peak Reflow Soldering Temperature (Note 3) 260 °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.

1. Value based on 4 layers of 645 mm

2

(or 1 in2) of 1 oz copper thickness on FR4 PCB substrate.

2. This device series incorporates ESD protection and is tested by the following methods: ESD Human Body Model tested per AEC−Q100−002 (EIA/JESD22−A114) Latchup Current Maximum Rating: v150 mA per JEDEC standard: JESD78

3. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D

30 °C/W

−40 to +150 °C

Table 3. ELECTRICAL CHARACTERISTICS

VIN = 4.5 to 28 V, VEN = 5 V, V range −40°C v T

v 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation (Notes 4, 5)

J

Parameter

QUIESCENT CURRENT

Quiescent Current, enabled

Quiescent Current, shutdown VIN = 13.2 V, VEN = 0 V, 25°C I

UNDERVOLTAGE LOCKOUT – VIN (UVLO)

UVLO Start Threshold

UVLO Stop Threshold VIN falling V

UVLO Hysteresis V

SOFT−START (SS)

Soft−Start Completion Time

OUTPUT VOLTAGE

Output Voltage during regulation

OSCILLATOR

Frequency

4. Refer to ABSOLUTE MAXIMUM RATINGS and APPLICATION INFORMATION for Safe Operating Area.

5. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at T duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.

= VSW + 3 V, C

BST

= 0.1 mF, for typical values TJ = 25°C, Min/Max values are valid for the temperature

DRV

Test Conditions Symbol Min Typ Max Unit

VIN = 13.2 V, I

= 100 mA, 25°C

OUT

VIN rising V

100 mA < I

< 2.5 A

OUT

5.0 V option

4.0 V option

3.8 V option

3.3 V option

4.5 < VIN < 18 V 20 V <V

< 28V

IN

I

q

qSD

UVLSTT

UVLSTP

UVLOHY

t

SS

V

OUTreg

F

SW

F

SW(HV)

4.1 4.5 V

3.1 3.7 V

0.4 1.4 V

0.8 1.4 2.0 ms

4.9

3.92

3.724

3.234

1.8

0.9

30 39

9 12

5.0

4.0

3.8

3.3

2.0

1.0

mA

V

5.1

4.08

3.876

3.366

2.2

MHz

1.1

= TA = 25°C. Low

J

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NCV891330

Table 3. ELECTRICAL CHARACTERISTICS

VIN = 4.5 to 28 V, VEN = 5 V, V range −40°C v T

v 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation (Notes 4, 5)

J

Parameter UnitMaxTypMinSymbolTest Conditions

VIN FREQUENCY FOLDBACK MONITOR

Frequency Foldback Threshold

rising

V

IN

VIN falling

Frequency Foldback Hysteresis V

MODE TRANSITION

Normal to Low−Iq mode Current Threshold

Mode Transition Duration

Switcher to Linear Linear to Switcher

Minimum time in Normal Mode before starting to monitor output current

Linear to switcher transition

at high Vin at low Vin

PEAK CURRENT LIMIT

Current Limit Threshold

POWER SWITCH

ON Resistance

Leakage current VIN to SW VSW = 0, −40°C v TJ v 85°C I

Minimum ON Time Measured at SW pin t

Minimum OFF Time Measured at SW pin

SLOPE COMPENSATION

Ramp Slope (With respect to switch current)

LOW POWER LINEAR REGULATOR

Line Regulation

Load Regulation VIN = 13.2 V, 0.1 mA < I

Power Supply Rejection V

Current Limit I

Output clamp current V

SHORT CIRCUIT DETECTOR

Switching frequency in short−circuit condition Analog Foldback

Analog foldback – high V Hiccup Mode

RESET

Leakage current into RSTB pin

Output voltage threshold at which the RSTB signal goes low

4. Refer to ABSOLUTE MAXIMUM RATINGS and APPLICATION INFORMATION for Safe Operating Area.

5. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at T duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.

= VSW + 3 V, C

BST

IN

= 0.1 mF, for typical values TJ = 25°C, Min/Max values are valid for the temperature

DRV

V

8 V < VIN < 28 V I

t t

t

V

= 3.3 V

OUT

V

= VSW + 3.0 V R

BST

V

LINtoSW(HV)

V

LINtoSW(LV)

t

At F

= 2 MHz (normal)

SW

At FSW = 500 kHz (max duty cycle)

4.5 < VIN < 18 V 20 V <VIN < 28V

I

= 5 mA, 6 V < VIN < 18 V V

OUT

< 50 mA V

OUT

OUT(ripple)

OUT

V

OUT

V

OUT

V

OUT

= 0.5 Vp−p, F = 100 Hz PSRR 65 dB

= V

OUTreg(typ)

+ 10% I

= 0 V, 4.5 V < VIN < 18 V = 0 V, 20 V <VIN < 28 V

decreasing

5.0 V option

S

F

V

4.0 V option

3.8 V option

3.3 V option

V

FLDUP

FLDDN

FLDHY

NtoL

SWtoLIN LINtoSW

SWblank

I

LIM

DSON

LKSW

ONMIN

OFFMIN

S

ramp

ramp(HV)

REG(line)

REG(load)

LIN(lim)

CL(OUT)

F

SWAF

SWAFHV

F

SWHIC

I

RSTBlk

RESET

18.4 18

0.2 0.3 0.4 V

3 40 mA

300

1 2

500

19

3.6

3.9 4.4 4.9 A

180 360

45 70 ns

30

1.45

0.65

50 70

2.0

1.0

5 25 mV

5 35 mV

50 80 mA

0.5 1.0 1.5 mA

450 225

24

4.50

3.6

3.42

2.97

550 275

32

4.625

3.7

3.515

3.05

20

V

19.8

ms

V

28

4.5

mW

10

mA

ns

2.8

A/ms

1.3

kHz 650 325

40

1 uA

V

4.75

3.8

3.61

3.14

= TA = 25°C. Low

J

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NCV891330

Table 3. ELECTRICAL CHARACTERISTICS

VIN = 4.5 to 28 V, VEN = 5 V, V range −40°C v T

v 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation (Notes 4, 5)

J

Parameter UnitMaxTypMinSymbolTest Conditions

RESET

Hysteresis on RSTB threshold

Noise−filtering delay From V

Restart Delay time From V

Low RSTB voltage R

GATE VOLTAGE SUPPLY (DRV pin)

Output Voltage

DRV UVLO START Threshold V

DRV UVLO STOP Threshold V

DRV UVLO Hysteresis V

DRV Current Limit V

VIN OVERVOLTAGE SHUTDOWN MONITOR

Overvoltage Stop Threshold

Overvoltage Start Threshold VIN decreasing V

Overvoltage Hysteresis V

ENABLE (EN)

Logic low threshold voltage

Logic high threshold voltage V

EN pin input current I

THERMAL SHUTDOWN

Activation Temperature

Reset temperature TSD

Hysteresis T

4. Refer to ABSOLUTE MAXIMUM RATINGS and APPLICATION INFORMATION for Safe Operating Area.

5. Performance guaranteed over the indicated operating temperature range by design and/or characterization tested at T duty cycle pulse techniques are used during testing to maintain the junction temperature as close to ambient as possible.

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.

= VSW + 3 V, C

BST

= 0.1 mF, for typical values TJ = 25°C, Min/Max values are valid for the temperature

DRV

V

increasing

OUT

5.0 V option

4.0 V option

3.8 V option

3.3 V option

OUT<VRESET

going low

OUT>VRESET+VREShys

high RSTB

RSTBpullup

DRV

= V

= 0 V I

to RSTB pin

/1 mA, V

OUTreg

to

OUT

> 1 V V

VIN increasing V

V

REShys

t

filter

t

delay

RSTBlow

V

DRV

DRVSTT

DRVSTP

DRVHYS

DRVLIM

OVSTP

OVSTT

OVHY

V

ENlow

ENhigh

ENbias

25 20 19 17

60 50 45 40

10 25

14 16 18 ms

3.1 3.3 3.5 V

2.7 2.9 3.05 V

2.5 2.8 3.0 V

50 200 mV

21 50 mA

36.5 37.7 39.0 V

36.0 37.3 38.8 V

0.25 0.40 0.50 V

0.8 V

0.2 1

TSD 155 190 °C

restart

HYS

135 185 °C

5 20 °C

J

100

mV

80 76 66

ms

0.4 V

2 V

mA

= TA = 25°C. Low

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NCV891330

TYPICAL CHARACTERISTICS

80

70

60

50

40

30

20

10

NO LOAD INPUT CURRENT (mA)

0

INPUT VOLTAGE (V)

Figure 3. No−load Input Current at TJ = 255C

vs. Input Voltage

100

80

60

40

1000

800

600

400

INPUT CURRENT (mA)

200

20151050

0

OUTPUT CURRENT (mA)

10008006004002000

Figure 4. Input Current at TJ = 255C vs. Output

Current

13

12

11

10

9

20

Iq IN LOW−Iq LINEAR MODE (mA)

0

TEMPERATURE (°C) TEMPERATURE (°C)

Figure 5. Low−Iq Mode Quiescent Current vs.

Junction Temperature

1.6

1.5

1.4

1.3

Iq IN SWITCHER MODE (mA)

1.2

TEMPERATURE (°C) TEMPERATURE (°C)

Figure 7. Switching Mode Quiescent Current

vs. Junction Temperature

8

Iq IN SHUTDOWN MODE (mA)

150100500−50

7

150100500−50

Figure 6. Shutdown Mode Quiescent Current

vs. Junction Temperature

3.36

3.34

3.32

Switcher Mode

3.30

3.28

3.26

3.3 V OUTPUT VOLTAGE (V)

150100500−50

3.24

Low−Iq Mode

150100500−50

Figure 8. 3.3 V Output Voltage vs. Junction

Temperature

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