NCP3064S3BCKGEVB - ON Semiconductor

July, 2009 − Rev. 8

1Publication Order Number:

NCP3064/D

NCP3064, NCP3064B,

NCV3064

1.5 A, Step-Up/Down/

Inverting Switching

Regulator with ON/OFF

Function

The NCP3064 Series is a higher frequency upgrade to the popular

MC33063A and MC34063A monolithic DC−DC converters. These

devices consist of an internal temperature compensated reference,

comparator, controlled duty cycle oscillator with an active current

limit circuit, driver and high current output switch. This series was

specifically designed to be incorporated in Step−Down and Step−Up

and Voltage−Inverting applications with a minimum number of

external components. The ON/OFF pin provides a low power

shutdown mode.

Features

•Input Voltage Range from 3.0 V to 40 V

•Logic Level Shutdown Capability

•Low Power Standby Mode, Typical 100 mA

•Output Switch Current to 1.5 A

•Adjustable Output Voltage Range

•150 kHz Frequency Operation

•Precision 1.5% Reference

•Internal Thermal Shutdown Protection

•Cycle−by−Cycle Current Limiting

•NCV Prefix for Automotive and Other Applications Requiring Site

and Control Changes

•These are Pb−Free Devices

Applications

•Step−Down, Step−Up and Inverting supply applications

•High Power LED Lighting

•Battery Chargers

Figure 1. Typical Buck Application Circuit

ON/OFF

Ipk

SWC

SWE

GND

ÇÇ

VCC

ON/OFF

VCC

GND

CIN

GND

VOUT

Rsense

NCP3064

PDIP−8

P, P1 SUFFIX

CASE 626

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MARKING

DIAGRAMS

DFN8

MN SUFFIX

CASE 488AF

SOIC−8

D SUFFIX

CASE 751

NCP3064x

AWL

YYWWG

NCP3064 = Specific Device Code

x=B

A = Assembly Location

L, WL = Wafer Lot

Y, YY = Year

W, WW = Work Week

G or G= Pb−Free Package

(Note: Microdot may be in either location)

See detailed ordering and shipping information in the package

dimensions section on page 17 of this data sheet.

ORDERING INFORMATION

3064x

ALYWG

NCV

3064

ALYWG

V3064

ALYWG

NCV3064

AWL

YYWWG

NCP

3064x

ALYWG

NCP3064, NCP3064B, NCV3064

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Figure 2. Pin Connections

Timing Capacitor

Comparator

Inverting

Input

VCC

ON/OFF

Ipk Sense

GND

Switch Emitter

Switch Collector

(Top View)

ÇÇ

Comparator

Inverting

Input

VCC

ON/OFF

Ipk Sense

Timing Capacitor

GND

Switch Emitter

Switch Collector

(Top View)

Figure 3. Pin Connections

NOTE: EP Flag must be tied to GND Pin 4 on PCB

EP Flag

SOIC−8/PDIP−8 DFN8

Figure 4. Block Diagram

−

7Comparator

CT 3

8TSD

0.2 V

−

Switch Collector

Switch Emitter

Timing Capacitor

GND

Comparator Inverting Input

VCC

Ipk Sense

ON/OFF

Oscillator

1.25 V

Reference

Regulator

ON/OFF

Bias

Comparator

PIN DESCRIPTION

Pin No. Pin Name Description

1Switch Collector Internal Darlington switch collector

2Switch Emitter Internal Darlington switch emitter

3Timing Capacitor Timing Capacitor Oscillator Input, Timing Capacitor

4 GND Ground pin for all internal circuits

5 Comparator

Inverting Input

Inverting input pin of internal comparator

6 VCC Voltage supply

7 Ipk Sense Peak Current Sense Input to monitor the voltage drop across an external resistor to limit the peak

current through the circuit

8 ON/OFF ON/OFF Pin. Pulling this pin to High level turns the device in Operating. To switch into mode with

low current consumption this pin has to be in Low level or floating.

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MAXIMUM RATINGS (measured vs. Pin 4, unless otherwise noted)

RATING SYMBOL VALUE UNIT

VCC (Pin 6) VCC −0.3 to 42 V

Comparator Inverting Input (Pin 5) VCII −0.3 to VCC V

Darlington Switch Emitter (Pin 2) (Transistor OFF) VSWE −0.6 to VCC V

Darlington Switch Collector (Pin 1) VSWC −0.3 to 42 V

Darlington Switch Collector to Emitter (Pins 1 and 2) VSWCE −0.3 to 42 V

Darlington Switch Peak Current ISW 1.5 A

Ipk Sense Voltage (Pin 7) VIPK −0.3 to (VCC + 0.3 V) V

Timing Capacitor Pin Voltage (Pin 3) VTC −0.2 to +1.4 V

Moisture Sensitivity Level MSL 1

Lead Temperature Soldering

Reflow (SMD Styles Only), Pb−Free Versions

TSLD 260

°C

ON/OFF Pin Voltage VON/OFF (−0.3 to 25) < VCC V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

THERMAL CHARACTERISTIC

Rating Symbol Value Unit

PDIP−8 (Note 5) Thermal Resistance Junction−to−Air RqJA 100 °C/W

SOIC−8 (Note 5) Thermal Resistance Junction−to−Air

Thermal Resistance Junction−to−Case

RqJA

RqJC

180

°C/W

DFN−8 (Note 5) Thermal Resistance Junction−to−Air

Thermal Resistance Junction−to−Case

RqJA

RqJC

°C/W

Storage temperature range TSTG −65 to +150 °C

Maximum junction temperature TJ MAX +150 °C

Operation Junction Temperature Range (Note 3) NCP3064

NCP3064B, NCV3064

TJ0 to +70

−40 to +125

°C

1. This device series contains ESD protection and exceeds the following tests:

Pins 1 through 8:

Human Body Model 2000 V per AEC Q100−002; 003 or JESD22/A114; A115

Machine Model Method 200 V

2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.

3. The relation between junction temperature, ambient temperature and Total Power dissipated in IC is TJ = TA + RQ @ PD.

4. The pins which are not defined may not be loaded by external signals.

5. 1 oz copper, 1 in2 copper area.

NCP3064, NCP3064B, NCV3064

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ELECTRICAL CHARACTERISTICS (VCC = 5.0 V, −40°C < TJ < +125°C for NCP3064B and NCV3064, 0°C < TJ < +70°C for

NCP3064 unless otherwise specified)

Symbol Characteristic Conditions Min Typ Max Unit

OSCILLATOR

fOSC Frequency (VPin 5 = 0 V, CT = 2.2 nF,

TJ = 25°C)

110 150 190 kHz

IDISCHG /

ICHG

Discharge to Charge Current Ratio (Pin 7 to VCC, TJ = 25°C) 5.5 6.0 6.5 −

ICCapacitor Charging Current (Pin 7 to VCC, TJ = 25°C) 275 mA

IDISCH Capacitor Discharging Current (Pin 7 to VCC, TJ = 25°C) 1.65 mA

VIPK Current Limit Sense Voltage (TJ = 25°C) 165 200 235 mV

OUTPUT SWITCH (Note 6)

VSWCE Darlington Switch Collector to

Emitter Voltage Drop

(ISW = 1.0 A, TJ = 25°C)

(Note 6)

1.0 1.3 V

IC(OFF) Collector Off−State Current (VCE = 40 V) 1.0 10 mA

COMPARATOR

VTH Threshold Voltage TJ = 25°C 1.25 V

NCP3064 −1.5 +1.5 %

NCP3064B, NCV3064 −1.5 +1.5 %

REGLiNE Threshold Voltage Line Regulation (VCC = 3.0 V to 40 V) −6.0 2.0 6.0 mV

ICII in Input Bias Current (Vin = Vth)−1000 −100 1000 nA

ON/OFF FEATURE

VIH ON/OFF Pin Logic Input Level High

VOUT = Nominal Output Voltage

TJ = 25°C

TJ = −40°C to +125°C

2.2

2.4

−

VIL ON/OFF Pin Logic Input Level Low

VOUT = 0 V

TJ = 25°C

TJ = −40°C to +125°C

−

1.0

0.8

IIH ON/OFF Pin Input Current

ON/OFF Pin = 5 V (ON)

TJ = 25°C 15 mA

IIL ON/OFF Pin Input Current

ON/OFF Pin = 0 V (OFF)

TJ = 25°C 1.0 mA

TOTAL DEVICE

ICC Supply Current (VCC = 5.0 V to 40 V,

CT = 2.2 nF, Pin 7 = VCC,

VPin 5 > Vth, Pin 2 = GND,

remaining pins open)

7.0 mA

ISTBY Standby Quiescent Current ON/OFF Pin = 0 V (OFF)

TJ = 25°C

TJ = −40°C to +125°C

85 100

100

TSHD Thermal Shutdown Threshold 160 °C

TSHDHYS Hysteresis 10 °C

6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient temperature as possible.

7. The VIPK (Sense) Current Limit Sense Voltage is specified at static conditions. In dynamic operation the sensed current turn−off value

depends on comparator response time and di/dt current slope. See the Operating Description section for details.

NCP3064, NCP3064B, NCV3064

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100

150

200

250

300

350

0 1 2 3 4 5 6 7 8 9 1011 12131415161718192021

Figure 5. Oscilator Frequency vs. Timing

Capacitor CT

, CAPACITANCE (nF)

TJ, JUNCTION TEMPERATURE (°C)

OSCILATOR FREQUENCY (kHz)

VOLTAGE DROP (V)

COMP. THRESHOLD VOLTAGE (V)

ICE = 0.25 A

0.5 A

0.75 A 1 A

1.25 A

TJ, JUNCTION TEMPERATURE (°C)

ON/OFF COMP. THRESHOLD VOLTAGE (V)

Figure 6. Oscillator Frequency vs. Supply

Voltage

VCC, SUPPLY VOLTAGE (V)

FREQUENCY (kHz)

Figure 7. Emitter Follower Configuration Output

Darlington Switch Voltage Drop vs. Temperature

VOLTAGE DROP (V)

ICE = 0.25 A

0.5 A

0.75 A

1 A

1.25 A

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

−40 −20 0 20 40 60 80 100 120 140

0.9

1.0

1.1

1.2

1.3

1.4

1.5

1.6

1.7

1.8

1.9

2.0

2.1

2.2

2.3

−40 −20 0 20 40 60 80 100 120 140

1.19

1.21

1.23

1.25

1.27

1.29

−40 −20 0 20 40 60 80 100 120 140

TJ, JUNCTION TEMPERATURE (°C)

Figure 8. Common Emmitter Configuration Out

Darlington Switch Voltage Drop vs. Temperatur

Figure 9. Comparator Threshold Voltage vs.

Temperature

Figure 10. ON/OFF Comparator Threshold

Voltage vs. Temperature

1.1

1.2

1.3

1.4

1.5

1.6

−40 −20 0 20 40 60 80 100 120 14

120

125

130

135

140

145

150

0 5 10 15 20 25 30 35 4

CT = 2.2 nF

TJ = 25°C

NCP3064, NCP3064B, NCV3064

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Figure 11. Current Limit Sense Voltage vs.

Temperature

TJ, JUNCTION TEMPERATURE (°C)

Vipk, CURRENT LIMIT SENSE

VOLTAGE (V)

0.15

0.16

0.17

0.18

0.19

0.20

−40 −20 0 20 40 60 80 100 120 140

100

150

200

250

300

350

400

450

0 5 10 15 20 25 30 35 40

Figure 12. Standby Current vs. Supply Voltage

VIN, INPUT VOLTAGE (V)

STANDBY SUPPLY CURRENT (mA)

NCP3064, NCP3064B, NCV3064

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INTRODUCTION

The NCP3064 is a monolithic power switching regulator

optimized for dc to dc converter applications. The

combination of its features enables the system designer to

directly implement step−up, step−down, and

voltage−inverting converters with a minimum number of

external components. Potential applications include cost

sensitive consumer products as well as equipment for

industrial markets. A representative block diagram is shown

in Figure 4.

Operating Description

The NCP3064 is a hysteric, dc−dc converter that uses a

gated oscillator to regulate output voltage. In general, this

mode of operation is some what analogous to a capacitor

charge pump and does not require dominant pole loop

compensation for converter stability. The Typical Operating

Waveforms are shown in Figure 13. The output voltage

waveform shown is for a step−down converter with the

ripple and phasing exaggerated for clarity. During initial

converter startup, the feedback comparator senses that the

output voltage level is below nominal. This causes the

output switch to turn on and off at a frequency and duty cycle

controlled by the oscillator, thus pumping up the output filter

capacitor. When the output voltage level reaches nominal,

the output switch next cycle turning on is inhibited. The

feedback comparator will enable the switching immediately

when the load current causes the output voltage to fall below

nominal. Under these conditions, output switch conduction

can be enabled for a partial oscillator cycle, a partial cycle

plus a complete cycle, multiple cycles, or a partial cycle plus

multiple cycles.

Oscillator

The oscillator frequency and off−time of the output switch

are programmed by the value selected for the timing

capacitor CT. Capacitor CT is charged and discharged by a

1 to 6 ratio internal current source and sink, generating a

positive going sawtooth waveform at Pin 3. This ratio sets

the maximum tON/(tON + tOFF) of the switching converter as

6/(6 + 1) or 0.857 (typical).

The oscillator peak and valley voltage difference is

500 mV typically. To calculate the CT capacitor value for the

required oscillator frequency, use the equation found in

Figure 15. An Excel® based design tool can be found at

www.onsemi.com on the NCP3064 product page.

Figure 13. Typical Operating Waveform

NCP3064, NCP3064B, NCV3064

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Peak Current Sense Comparator

With a voltage ripple gated converter operating under

normal conditions, output switch conduction is initiated by

the Voltage Feedback comparator and terminated by the

oscillator. Abnormal operating conditions occur when the

converter output is overloaded or when feedback voltage

sensing is lost. Under these conditions, the Ipk Current

Sense comparator will protect the Darlington output Switch.

The switch current is converted to a voltage by inserting a

fractional W resistor, RSC, in series with VCC and the

Darlington output switch. The voltage drop across RSC is

monitored by the Current Sense comparator. If the voltage

drop exceeds 200 mV with respect to VCC, the comparator

will set the latch and terminate output switch conduction on

a cycle−by−cycle basis. This Comparator/Latch

configuration ensures that the Output Switch has only a

single on−time during a given oscillator cycle.

Real

Vturn−off on

Rs Resistor

t_delay

di/dt slope I through the

Darlington

Switch

Vipk(sense)

Figure 14. Current Sense Waveform

The VIPK(Sense) Current Limit Sense Voltage threshold is

specified at static conditions. In dynamic operation the

sensed current turn−off value depends on comparator

response time and di/dt current slope.

Real Vturn−off on Rsc resistor

Vturn_off = Vipk(sense) + Rs*(tdelay*di/dt)

Typical Ipk comparator response time tdelay is 350 ns. The

di/dt current slope is growing with voltage difference on the

inductor pins and with decreasing inductor value. It is

recommended to check the real max peak current in the

application at worst conditions to be sure that the maximum

peak current will never get over the 1.5 A Darlington Switch

Current maximum rating.

Thermal Shutdown

Internal thermal shutdown circuitry is provided to protect

the IC in the event that the maximum junction temperature

is exceeded. When activated, typically at 160°C, the Output

Switch is disabled. The temperature sensing circuit is

designed with 10°C hysteresis. The Switch is enabled again

when the chip temperature decreases to at least 150°C

threshold. This feature is provided to prevent catastrophic

failures from accidental device overheating. It is not

intended to be used as a replacement for proper

heat−sinking.

Output Switch

The output switch is designed in a Darlington

configuration. This allows the application designer to

operate at all conditions at high switching speed and low

voltage drop. The Darlington Output Switch is designed to

switch a maximum of 40 V collector to emitter voltage and

current up to 1.5 A

ON/OFF Function

The ON/OFF function disables switching and puts the part

into a low power consumption mode. A PWM signal up to

1 kHz can be used to pulse the ON/OFF and control the

output. Pulling this pin below the threshold voltage (~1.4 V)

or leaving it open turns the regulator off and has a standby

current <100 mA. Pulling this pin above 1.4 V (up to 25 V

max) allows the regulator to run in normal operation. If the

ON/OFF feature is not needed, the ON/OFF pin can be

connected to the input voltage VCC, provided that this

voltage does not exceed 25 V.

NCP3064, NCP3064B, NCV3064

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APPLICATIONS

Figures 16, 20 and 24 show the simplicity and flexibility

of the NCP3064. Two main converter topologies are

demonstrated with actual test data shown below the circuit

diagrams.

Figure 15 gives the relevant design equations for the key

parameters. Additionally, a complete application design aid

for the NCP3064 can be found at www.onsemi.com.

It is possible to create applications with external

transistors. This solution helps to increase output current and

helps with efficiency, still keeping the cost of materials low.

Another advantage of using the external transistor is higher

operating frequency, which can go up to 250 kHz. Smaller

size of the output components such as inductor and capacitor

can be used then.

(See Notes 8, 9, 10) Step−Down Step−Up Voltage−Inverting

ton

toff

Vout )VF

Vin *VSWCE *Vout

Vout )VF*Vin

Vin *VSWCE

|Vout|)VF

Vin *VSWCE

ton ton

toff

fǒton

toff )1Ǔ

ton

toff

fǒton

toff )1Ǔ

ton

toff

fǒton

toff )1Ǔ

CTCT+381.6 @10*6

fosc *343 @10*12

IL(avg) Iout Iout ǒton

toff )1ǓIout ǒton

toff )1Ǔ

Ipk (Switch) IL(avg) )DIL

2IL(avg) )DIL

RSC 0.20

Ipk (Switch)

0.20

Ipk (Switch)

0.20

Ipk (Switch)

LǒVin *VSWCE *Vout

DILǓton ǒVin *VSWCE

DILǓton

Vripple(pp)

DILǒ1

8fCOǓ2

)(ESR)2

Ǹ[

ton Iout

CO)DIL@ESR [

ton Iout

CO)DIL@ESR

Vout VTHǒR1

R2)1ǓVTHǒR1

R2)1Ǔ

8. VSWCE − Darlington Switch Collector to Emitter Voltage Drop, refer to Figures 7, 5, 8 and 9.

9. VF − Output rectifier forward voltage drop. Typical value for 1N5819 Schottky barrier rectifier is 0.4 V.

10.The calculated ton/toff must not exceed the minimum guaranteed oscillator charge to discharge ratio.

Figure 15. Design Equations

The Following Converter Characteristics Must Be Chosen:

Vin − Nominal operating input voltage.

Vout − Desired output voltage.

Iout − Desired output current.

DIL − Desired peak−to−peak inductor ripple current. For maximum output current it is suggested that DIL be chosen to be

less than 10% of the average inductor current IL(avg). This will help prevent Ipk (Switch) from reaching the current limit threshold

set by RSC. If the design goal is to use a minimum inductance value, let DIL = 2(IL(avg)). This will proportionally reduce

converter output current capability.

f − Maximum output switch frequency.

Vripple(pp) − Desired peak−to−peak output ripple voltage. For best performance the ripple voltage should be kept to a low

value since it will directly affect line and load regulation. Capacitor CO should be a low equivalent series resistance (ESR)

electrolytic designed for switching regulator applications.

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ON/OFF

Ipk

COMP

SWC

SWE

GND

VCC

ON/OFF

VIN

GND

C10

3k9

GND

VOUT

NCP3064

SOIC

Figure 16. Typical Buck Application Schematic

2k4

C8C9

IC1

0.1mF

220mF

R15

10k

12k0

47mH

2n2

0.1mF 220mF

Input

Table 1. TESTED PARAMETERS

Parameter

Input Voltage

(V)

Output Voltage

(V)

Input Current

(A)

Output Current

(A)

Value 10 − 16 3.3 Max. 0.6 A Max. 1.25

Table 2. BILL OF MATERIAL

Designator Qty Description Value Tolerance Footprint Manufacturer

Manufacturer

Part Number

R1 1 Resistor 0.15W1% 1206 Susumu RL1632R-R150-F

R2 1 Resistor 12k 1% 1206 ROHM MCR18EZHF1202

R3 1 Resistor 3k9 1% 1206 ROHM MCR18EZHF3901

R4 1 Resistor 2k4 1% 1206 ROHM MCR18EZHF4701

R9 1 Resisitor 10k 1% 1206 ROHM MCR18EZHF1002

C1 1 Capacitor 220mF/35V 20% F PANASONIC EEEFP1V221AP

C2, C8 2 Capacitor 100nF 10% 1206 Kemet C1206C104K5RACTU

C9 1 Capacitor 220mF/6V 20% F8 SANYO 6SVP220M

C10 1 Capacitor 2.2nF 10% 1206 Kemet C1206C222K5RACTU

L1 1 Inductor 47mH20% DO3316 CoilCraft DO3316P-473MLB

D1 1 Diode MBRS230 −SMB ON Semiconductor MBRS230LT3G

IC 1 Switching

Regulator

NCP3064 −SOIC8 ON Semiconductor NCP3064DR2G

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Figure 17. Buck Demoboard Layout Figure 18. Buck Demoboard Photo

Figure 19. Efficiency vs. Output Current for

Buck Demoboard

OUTPUT CURRENT (A)

EFFICIENCY (%)

Vin = 10 V

Vin = 16 V

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2

Table 3. TEST RESULTS

Line Regulation Vin = 9 V to 12 V, Vout = 3.3 V, Iout = 800 mA 8 mV

Load Regulation Vin = 12 V, Vout = 3.3 V, Iout = 800 mA 10 mV

Output Ripple Vin = 12 V, Vout = 3.3 V, Iout = 100 mA to 800 mA < 85 mV Peak - Peak

Efficiency Vin = 12 V, Vout = 3.3 V, Iout = 500 mA 70%

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ON/OFF

Ipk

COMP

SWC

SWE

GND

VCC

ON/OFF

VIN

GND

100n

C10

18k0

GND

VOUT

NCP3064

SOIC

Figure 20. Typical Boost Application Schematic

1k0

C5C6

IC1

150mF

0R15

10k0

100mH

2n2

0.1mF330mF

Input

Table 4. TESTED PARAMETERS

Parameter

Input Voltage

(V)

Output Voltage

(V)

Input Current

(A)

Output Current

(A)

Value 10 − 16 24 Max. 1.25 Max. 0.6

Table 5. BILL OF MATERIAL

Designator Qty Description Value Tolerance Footprint Manufacturer

Manufacturer Part

Number

R1 1 Resistor 0.15W1% 1206 Susumu RL1632R-R150-F

R5 1 Resistor 18k 1% 1206 ROHM MCR18EZHF1802

R6 1 Resistor 1k 1% 1206 ROHM MCR18EZHF1001

R9 1 Resisitor 10k 1% 1206 ROHM MCR18EZHF1002

C1 1 Capacitor 150mF/16V 20% F8 SANYO 6SVP150M

C2, C5 2 Capacitor 100nF 10% 1206 Kemet C1206C104K5RACTU

C6 1 Capacitor 330mF/25V 20% SMD Panasonic EEE-FK1E331GP

C10 1 Capacitor 2.2nF 10% 1206 Kemet C1206C222K5RACTU

L2 1 Inductor 100mH20% DO3316 CoilCraft DO3316P-104MLB

D2 1 Diode MBRS230 −SMB ON Semiconductor MBRS230LT3G

IC 1 Switching

Regulator

NCP3064 −SOIC8 ON Semiconductor NCP3064DR2G

Figure 21. Boost Demoboard Layout Figure 22. Boost Demoboard Photo

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Table 6. TEST RESULTS

Line Regulation Vin = 9 V to 15 V, Vout = 24 V, Iout = 250 mA 3 mV

Load Regulation Vin = 12 V, Vout = 24 V, Iout = 50 to 350 mA 5 mV

Output Ripple Vin = 12 V, Vout = 24 V, Iout = 50 to 350 mA < 350 mV Peak - Peak

Efficiency Vin = 12 V, Vout = 24 V, Iout = 200 mA 86%

0 0.04 0.12 0.2 0.28 0.36 0.44

EFFICIENCY (%)

Figure 23. Efficiency vs. Output Current

Current for Boost Demoboard

OUTPUT CURRENT (A)

Vin = 10 V

Vin = 16 V

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ON/OFF

Ipk

COMP

SWC

SWE

GND

VCC

ON/OFF

VIN

GND

C10

2n2

3k9

GND

VOUT

NCP3064

Figure 24. Typical Buck with External Transistor Application Schematic

2k4

IC1

100n

m15

22mH

0.1mF1mF

Input

1n8

10k

R14 ...... R16

4 x R15

10k

Table 7. TESTED PARAMETERS

Parameter

Input Voltage

(V)

Output Voltage

(V)

Input Current

(A)

Output Current

(A)

Value 10 – 16 3.3 Max. 1.25 Max. 3

Table 8. BILL OF MATERIAL

Designator Qty Description Value Tolerance Footprint Manufacturer

Manufacturer

Part Number

R1, R14,

R15, R16

4 Resistor 0.15R 1% 1206 Susumu RL1632R-R150-F

R5, R6 2 Resistor 1k 1% 1206 ROHM MCR18EZHF1001

R3 1 Resistor 3k9 1% 1206 ROHM MCR18EZHF3901

R4 1 Resistor 2k4 1% 1206 ROHM MCR18EZHF2401

R7;R9 2 Resistor 10k 1% 1206 ROHM MCR18EZHF1002

C1 1 Capacitor 270mF20% 10 x 16 PANASONIC EEUFC1V271

C4 1 Capacitor 1n8 10% 1206 Kemet C1206C182K5RACTU

C2, C8 2 Capacitor 100nF 10% 1206 Kemet C1206C104K5RACTU

C9 1 Capacitor 1mF 20% F8 SANYO 4SA1000M

C10 1 Capacitor 2.2nF 10% 1206 Kemet C1206C222K5RACTU

Q1 1 Transistor MMSF7P03 −SOIC8 ON Semiconductor MMSF7P03HDR2G

Q2 1 Transistor NPN MMBT489L −SOT-23 ON Semiconductor MMBT489LT1G

D2 1 Diode MBR130T −SOD-123 ON Semiconductor MBR130T1G

IC1 1 Switching

Regulator

NCP3064 −SOIC8 ON Semiconductor NCP3064DR2G

D1 1 Diode MBRS330T −SMC ON Semiconductor MBRS330T3G

L1 1 Inductor 22mH20% Coilcraft Coilcraft DO5040H-223MLB

NCP3064, NCP3064B, NCV3064

http://onsemi.com

Figure 25. Buck Demoboard with External

PMOS Transistor Layout

Figure 26. Buck Demoboard with External

PMOS Transistor Photo

0 0.5 1.0 1.5 2.0 2.5 3.0

Vin = 10 V

Vin = 16 V

Figure 27. Efficiency vs. Output Current Current for Buck Demoboard with External PMOS Transistor

OUTPUT CURRENT (A)

EFFICIENCY (%)

Table 9. TEST RESULTS

Line Regulation Vin = 9 V to 15 V, Vout = 3.3 V, Iout = 2 A 8 mV

Load Regulation Vin = 12 V, Vout = 3.3 V, Iout = 0.5 to 3.0 A 10 mV

Output Ripple Vin = 12 V, Vout = 3.3 V, Iout = 0.5 to 3.0 A < 300 mV Peak - Peak

Efficiency Vin = 12 V, Vout = 3.3 V, Iout = 2 A 82%

NCP3064, NCP3064B, NCV3064

http://onsemi.com

The picture in Figure 24. Typical Buck Application

Schematic shows typical configuration with external PMOS

transistor. Resistor R7 connected between timing capacitor

TC Pin and SWE Pin provides a pulse feedback voltage.

The pulse feedback approach increases the operating

ffrequency by up to 50%. Figure 28, Oscillator Frequency

vs. Timing Capacitor with Pulse Feedback, shows the

impact to the oscillator frequency at buck converter for Vin

= 12 V and Vout = 3.3 V with pulse feedback resistor

R7 = 10 kW. It also creates more regular switching

waveforms with constant operating frequency which results

in lower ripple voltage and improved efficiency.

If the application allows ON/OFF pin to be biased by

voltage and the power supply is not connected to Vcc pin at

the same time, then it is recommended to limit ON/OFF

current by resistor with value 10 kW to protect the NCP3064

device. This situation is mentioned in Figure 29, ON/OFF

Serial Resistor Connection.

This resistor shifts the ON/OFF threshold by about

200 mV to higher value, but the TTL logic compatibility is

kept in full range of input voltage and operating temperature

range.

100

150

200

250

300

350

400

450

0246810121416182022

Without Pulse

Feedback

Figure 28. Oscillator Frequency vs. Timing Capacitor with Pulse Feedback

TIMING CAPACITANCE (nF)

OSCILLATOR FREQUENCY (kHz)

With Pulse

Feedback

VIN

ON/OFF

Rsense

NCP3064

IC1

10k

R15

Figure 29. ON/OFF Serial Resistor Connection

ON/OFF

VCC

Ipk

GND

SWE

SWC

NCP3064, NCP3064B, NCV3064

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ORDERING INFORMATION

Device Package Shipping†

NCP3064MNTXG DFN−8

(Pb−Free)

4000 Units / Tape & Reel

NCP3064BMNTXG DFN−8

(Pb−Free)

4000 Units / Tape & Reel

NCP3064PG PDIP−8

(Pb−Free)

50 Units / Rail

NCP3064BPG PDIP−8

(Pb−Free)

50 Units / Rail

NCP3064DR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

NCP3064BDR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

NCV3064MNTXG DFN−8

(Pb−Free)

4000 Units / Tape & Reel

NCV3064PG PDIP−8

(Pb−Free)

50 Units / Rail

NCV3064DR2G SOIC−8

(Pb−Free)

2500 Units / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

NCP3064, NCP3064B, NCV3064

http://onsemi.com

PACKAGE DIMENSIONS

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN

FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR

SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

STYLE 1:

PIN 1. AC IN

2. DC + IN

3. DC - IN

4. AC IN

5. GROUND

6. OUTPUT

7. AUXILIARY

8. VCC

NOTE 2 −A−

−B−

−T−

SEATING

PLANE

0.13 (0.005) B M

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A9.40 10.16 0.370 0.400

B6.10 6.60 0.240 0.260

C3.94 4.45 0.155 0.175

D0.38 0.51 0.015 0.020

F1.02 1.78 0.040 0.070

G2.54 BSC 0.100 BSC

H0.76 1.27 0.030 0.050

J0.20 0.30 0.008 0.012

K2.92 3.43 0.115 0.135

L7.62 BSC 0.300 BSC

M--- 10 --- 10

N0.76 1.01 0.030 0.040

8 LEAD PDIP

CASE 626−05

ISSUE L

NCP3064, NCP3064B, NCV3064

http://onsemi.com

PACKAGE DIMENSIONS

SOIC−8 NB

CASE 751−07

ISSUE AJ

SEATING

PLANE

X 45 _

NOTES:

1. DIMENSIONING AND TOLERANCING PER

ANSI Y14.5M, 1982.

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A AND B DO NOT INCLUDE

MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)

PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR

PROTRUSION. ALLOWABLE DAMBAR

PROTRUSION SHALL BE 0.127 (0.005) TOTAL

IN EXCESS OF THE D DIMENSION AT

MAXIMUM MATERIAL CONDITION.

6. 751−01 THRU 751−06 ARE OBSOLETE. NEW

STANDARD IS 751−07.

0.10 (0.004)

DIM

MIN MAX MIN MAX

INCHES

4.80 5.00 0.189 0.197

MILLIMETERS

B3.80 4.00 0.150 0.157

C1.35 1.75 0.053 0.069

D0.33 0.51 0.013 0.020

G1.27 BSC 0.050 BSC

H0.10 0.25 0.004 0.010

J0.19 0.25 0.007 0.010

K0.40 1.27 0.016 0.050

M0 8 0 8

N0.25 0.50 0.010 0.020

S5.80 6.20 0.228 0.244

−X−

−Y−

0.25 (0.010)

−Z−

0.25 (0.010) ZSXS

____

1.52

0.060

7.0

0.275

0.6

0.024

1.270

0.050

4.0

0.155

ǒmm

inchesǓ

SCALE 6:1

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

NCP3064, NCP3064B, NCV3064

http://onsemi.com

PACKAGE DIMENSIONS

8 PIN DFN, 4x4

CASE 488AF−01

ISSUE C

ÉÉÉ

NOTES:

1. DIMENSIONS AND TOLERANCING PER

ASME Y14.5M, 1994.

2. CONTROLLING DIMENSION: MILLIMETERS.

3. DIMENSION b APPLIES TO PLATED

TERMINAL AND IS MEASURED BETWEEN

0.15 AND 0.30MM FROM TERMINAL TIP.

4. COPLANARITY APPLIES TO THE EXPOSED

PAD AS WELL AS THE TERMINALS.

5. DETAILS A AND B SHOW OPTIONAL

CONSTRUCTIONS FOR TERMINALS.

DIM MIN MAX

MILLIMETERS

A0.80 1.00

A1 0.00 0.05

A3 0.20 REF

b0.25 0.35

D4.00 BSC

D2 1.91 2.21

E4.00 BSC

E2 2.09 2.39

e0.80 BSC

K0.20 −−−

L0.30 0.50

C0.15

TOP VIEW

SIDE VIEW

BOTTOM VIEW

ÇÇ

(A3)

SEATING

PLANE

C0.08

C0.10

ÇÇ

8X L

NOTE 3

0.10 C

0.05 C

PIN ONE

REFERENCE

*For additional information on our Pb−Free strategy and soldering

details, please download the ON Semiconductor Soldering and

Mounting Techniques Reference Manual, SOLDERRM/D.

SOLDERING FOOTPRINT*

0.63

2.21

2.39

0.80

PITCH

4.30

0.35

DETAIL A

OPTIONAL

CONSTRUCTIONS

ÉÉ

ÇÇ

ÉÉ

DETAIL B

MOLD CMPDEXPOSED Cu

ALTERNATE

CONSTRUCTIONS

L1 −−− 0.15

DETAIL B

NOTE 4

DETAIL A

DIMENSIONS: MILLIMETERS

PACKAGE

OUTLINE

ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice

to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability

arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.

“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All

operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights

nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications

intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should

Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,

and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death

associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal

Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

PUBLICATION ORDERING INFORMATION

N. American Technical Support: 800−282−9855 Toll Free

USA/Canada

Europe, Middle East and Africa Technical Support:

Phone: 421 33 790 2910

Japan Customer Focus Center

Phone: 81−3−5773−3850

NCP3064/D

Excel is a registered trademark of Microsoft Corporation.

LITERATURE FULFILLMENT:

Literature Distribution Center for ON Semiconductor

P.O. Box 5163, Denver, Colorado 80217 USA

Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada

Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada

Email: orderlit@onsemi.com

ON Semiconductor Website: www.onsemi.com

Order Literature: http://www.onsemi.com/orderlit

For additional information, please contact your local

Sales Representative