AP3433FNTR-G1_技术文档

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter

AP3433

Features

General Description

•

Input Voltage Range: 2.95V to 5.5V

The AP3433 is a current mode, PWM synchronous

buck (step-down) DC-DC converter, capable of

driving a 3A load with high efficiency, excellent line

and load regulation.

0.827V Reference Voltage with ±3% Precision

Two 45mΩ(typical) MOSFETs for High

Efficiency at 3A Load

•

High Efficiency: up to 94%

Output Current: 3A

Programmable Frequency:300kHz to 2MHz

Current Mode Control

Synchronizes to External Clock

Adjustable Soft-start

Soft Start-up into Pre-biased Output

UV and OV Power Good Output

Built-in Over Current Protection

Built-in Thermal Shutdown Function

Programmable UVLO Function

Built-in Over Voltage Protection

Thermally Enhanced 3mm×3mm 16-pin QFN

The device integrates two N-channel power

MOSFETs with low on-resistance. Current mode

control provides fast transient response and

cycle-by-cycle current limit.

The switching frequency of AP3433 can be

programmable from 300kHz to 2MHz, which allows

small-sized components, such as capacitors and

inductors. A standard series of inductors from several

different manufacturers are available. This feature

greatly simplifies the design of switch-mode power

supplies.

Under voltage lockout is internally set at 2.6V, but

can be increased by programming the threshold with

a resistor network on the enable pin. The output

voltage startup ramp is controlled by the soft-start pin.

An open drain power good signal indicates the output

is within 93% to 107% of its nominal voltage.

Applications

•

Low-voltage, High-density Power Systems

Point of Load Regulation for Consumer

Applications such as Set Top Boxes, LCD

Displays, CPE Equipment

The AP3433 is available in QFN-3×3-16 package.

QFN-3×3-16

Figure 1. Package Type of AP3433

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

1

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Pin Configuration

FN Package

(QFN-3×3-16)

Pin 1 Mark

16

15

14

13

SW

VIN

12

1

11 SW

2

VIN

E P

SW

10

GND

3

4

9

SS

GND

5

6

7

8

Figure 2. Pin Configuration of AP3433 (Top View)

Pin Description

Pin Number

Pin Name

Function

Supply input pin. A capacitor should be connected between the VIN and GND

pin to keep the DC input voltage constant

1,2,16

VIN

Power ground. This pin should be electrically connected to the power pad under

the IC

3,4

GND

Analog ground. This pin should be electrically connected to GND close to the

device

5

6

7

AGND

FB

Feedback pin. Inverting node of the transconductance error amplifier

Compensation pin. This pin is the output of the transconductance error amplifier

and the input to the current comparator. Connect external compensation elements

to this pin to stabilize the control loop

COMP

8

9

RT/CLK

SS

Resistor timing or external clock input pin

Soft-start pin. An external capacitor connected to this pin sets the output voltage

rise time. This pin can also be used for tracking

Internal power switch output pin. This pin is connected to the inductor and

bootstrap capacitor

10,11,12

13

SW

Bootstrap pin. A bootstrap capacitor is connected between the BOOT pin and SW

pin. The voltage across the bootstrap capacitor drives the internal high-side power

MOSFET

BOOT

Power good indicator output. Asserts low if output voltage is low due to thermal

shutdown, over-current, over/under-voltage or EN shut down

14

15

PGD

EN

Enable pin, internal pull-up current source. Pull below 1.2V to disable. Float to

enable. Can be used to set the on/off threshold (adjust UVLO) with two additional

resistors

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

2

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter

Functional Block Diagram

AP3433

Figure 3. Functional Block Diagram of AP3433

Ordering Information

AP3433

-

G1: Green

Circuit Type

Package

TR: Tape & Reel

FN: QFN-3×3-16

Temperature

Range

Package

Part Number

Marking ID

Packing Type

QFN-3×3-16

-40 to 85ºC

AP3433FNTR-G1

B1D

Tape & Reel

BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant

and green.

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

3

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter

Absolute Maximum Ratings (Note 1)

AP3433

Parameter

Symbol

V_IN

Value

-0.3 to 6.5

-0.3 to V_IN+0.3

-0.3 to 6.5

Unit

V

VIN Pin Voltage

EN Pin Voltage

SW Pin Voltage

FB Pin Voltage

COMP Pin Voltage

PGD Pin Voltage

RT/CLK Pin Voltage

SS Pin Voltage

V_EN

V

V_SW

V

V_FB

V

V_COMP

V_PGD

V_RT/CLK

V_SS

V

Thermal Resistance

(Junction to Ambient)

Thermal Resistance

(Junction to Case)

70

5

ºC/W

θ_JA

θ_{JC (BOTTOM)}

Operating Junction Temperature

Storage Temperature

T_J

-40 to 125

-65 to 150

260

ºC

V

T_STG

T_LEAD

Lead Temperature (Soldering, 10sec)

ESD (Machine Model)

200

ESD (Human Body Model)

2000

V

Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to

the device. These are stress ratings only, and functional operation of the device at these or any other conditions

beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute

Maximum Ratings” for extended periods may affect device reliability.

Recommended Operating Conditions

Parameter

Symbol

V_IN

Min

2.95

3

Max

Unit

V

Input Voltage

5.5

Maximum Output Current

Operating Ambient Temperature

I_OUT(MAX)

T_A

A

-40

85

ºC

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

4

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Electrical Characteristics

V_IN=2.95 to 5.5V, T_A=25ºC, unless otherwise specified. Specifications with boldface type apply over full

operating temperature range from -40 to 85ºC.

Parameters

Symbol

Conditions

Min

Typ

Max

Unit

SUPPLY VOLTAGE (VIN PIN)

Input Voltage

V_IN

I_Q

2.95

5.5

575

5

V

V_FB=0.9V,V_IN=5V,

T_A=25°C, R_T=400kΩ

V_EN=0V,T_A=25°C

2.95V≤V_IN≤5.5V

Quiescent Current

360

2

µA

Shutdown

Current

Supply

I_SHDN

ENABLE AND UVLO (EN PIN)

V_{EN_H}

Rising

Falling

1.16

1.25

1.18

1.37

2.8

V

Enable Threshold

V_{EN_L}

Internal Under Voltage

V_UVLO

2.6

V

Lockout Threshold

Internal Under Voltage

V_HYS

Hysteresis

150

mV

VOLTAGE REFERENCE (FB PIN)

Voltage Reference

V_REF

2.95V≤V_IN≤5.5V

0.802

0.827

0.852

V

MOSFET

V

_BOOT-SW=5V

45

64

81

mΩ

High

On-resistance

Side

Switch

R_{ON_H}

V_BOOT-SW=2.95V

V_IN=5V

110

42

59

81

mΩ

Low

On-resistance

Side

R_{ON_L}

V_IN=2.95V

110

CURRENT LIMIT

Current

Threshold

Limit

I_LIMIT

4.2

6.6

A

THERMAL SHUTDOWN

Thermal Shutdown

Hysteresis

T_TSD

140

20

°C

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

5

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Electrical Characteristics (Continued)

V_IN=2.95 to 5.5V, T_A=25ºC, unless otherwise specified. Specifications with boldface type apply over full

operating temperature range from -40 to 85ºC.

Parameters

Symbol

Conditions

Min

Typ

Max

Unit

TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)

Switching Frequency

300

2000

600

kHz

ns

Range (RT Mode)

Switching Frequency

300

Range (CLK Mode)

Switching Frequency

f_S

400

75

500

R_T=400kΩ

Minimum CLK Pulse

Width

RT/CLK Voltage

0.5

1.6

0.6

V

R_T=400kΩ

RT/CLK

Threshold

High

Low

2.2

V

RT/CLK

Threshold

0.4

V

BOOT (BOOT PIN)

BOOT Charge Resistor

BOOT-SW UVLO

R_BOOT

V_IN=5V

16

Ω

V_IN=2.95V

2.2

V

SOFT START (SS PIN)

Charge Current

I_SS

V_SS=0.4

2.2

1.1

µA

SS

to

Reference

V_SS

98% Nominal

V

Crossover

POWER GOOD (PGD PIN)

V

_FBFalling (Fault)

91

93

V_FBRising (Good)

V_FBRising (Fault)

Feedback Threshold

V_{FB_TH}

%V_REF

107

V_FBFalling (Good)

105

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter

AP3433

Typical Performance Characteristics

430

425

420

415

410

405

400

395

390

385

380

375

370

365

360

470

460

450

440

430

420

410

400

390

380

370

V_IN=5V

V

_FB=0.9V

-50

-25

0

25

50

75

100

125

150

2.7

3.0

3.3

3.6

3.9

4.2

4.5

4.8

5.1

5.4

5.7

Temperature (^oC)

Input Voltage (V)

Figure 4. Supply Current vs. Input Voltage

Figure 5. Supply Current vs. Temperature

100

95

90

85

80

75

70

65

60

55

50

45

40

35

30

2.60

2.55

2.50

2.45

2.40

2.35

2.30

2.25

2.20

2.15

2.10

V_OUT=1.8V

V_IN=3.3V

Start Switching

Stop Switching

V_IN=5V

-50

-25

0

25

50

75

100

125

150

0

300

600

900 1200 1500 1800 2100 2400 2700 3000

Output Current (mA)

Temperature (^oC)

Figure 6. Efficiency vs. Output Current

Figure 7.UVLO Threshold vs. Temperature

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

7

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Typical Performance Characteristics (Continued)

1020

1010

1000

990

980

970

960

950

940

930

920

910

900

0.834

0.832

0.830

0.828

0.826

0.824

0.822

0.820

0.818

0.816

R_T=180k

-50

-25

0

25

50

75

100

125

150

-50

-25

0

25

50

75

100

125

150

Temperature (^oC)

Temperature (°C)

Figure 8. Switching Frequency vs. Temperature

Figure 9. Reference Voltage vs. Temperature

800

2000

1900

1800

1700

1600

1500

1400

1300

1200

1100

1000

900

700

600

500

400

300

200

100

800

300

400

500

600

700

800

900

1000

80

100

120

140

160

180

200

RT Resistance (kΩ)

Figure 10. Switching Frequency vs. RT Resistance

Low Frequency Range

Figure 11. Switching Frequency vs. RT Resistance

High Frequency Range

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

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Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Typical Performance Characteristics (Continued)

V_EN

2V/div

V_OUT

1V/div

V_SS

V_IN

2V/div

V_OUT

1V/div

V_SS

2V/div

I_L

2A/div

2V/div

I_L

2A/div

Time 4ms/div

Time 20µs/div

Figure 12. Start up from V_IN(V_IN=5V, V_OUT=1.8V, I_OUT=3A)

Figure 13. Disable IC (V_IN=5V, V_OUT=1.8V, I_OUT=3A)

V_OUT(AC)

200mV/div

V_CLOCK

2V/div

V_SW

2V/div

I_OUT

2A/div

Time 200µs/div

Time 400ns/div

Figure 14. Load Transient Response

(V_IN=5V, V_OUT=1.8V, I_OUT=0 to 3A)

Figure 15. Synchronizing to External Clock

(f_CLOCK=2MHz)

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

9

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Typical Performance Characteristics (Continued)

V_OUT

1V/div

V_OUT

1V/div

V_SS

2V/div

V_COMP

0.5V/div

V_COMP

0.5V/div

I_L

2A/div

I_L

2A/div

Time 4ms/div

Figure 16. Short Circuit Protection

(V_IN=5V, V_OUT=1.8V, I_OUT=3A)

Figure 17. Short Circuit Recovery

(V_IN=5V, V_OUT=1.8V, I_OUT=3A)

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

10

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter AP3433

Typical Application

Figure 18. Typical Application of AP3433

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

11

Preliminary Datasheet

3A, 2MHz High Performance Synchronous Buck Converter

AP3433

Mechanical Dimensions

QFN-3×3-16

Unit:mm(inch)

Jul. 2012 Rev. 1. 1

BCD Semiconductor Manufacturing Limited

12

BCD Semiconductor Manufacturing Limited

http://www.bcdsemi.com

IMPORTANT NOTICE

BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-

cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any

particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use

of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or

other rights nor the rights of others.

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型号：	AP3433FNTR-G1
厂家：	DIODES INCORPORATED
描述：	Switching Regulator, Current-mode, 3A, 2000kHz Switching Freq-Max, QFN-16 开关
文件：	总13页 (文件大小：411K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AP3433FNTR-G1 [DIODES]

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