EC4514|24V, 4A Asynchronous Boost Converte

EC4514|24V, 4A Asynchronous Boost Converte


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EC4514

24V, 4A Asynchronous Boost Converte

 

General Description

 

 

The EC4514 is a asynchronous rectifier, fixed switching frequency (600kHz or 1.2MHz typical), and current‐mode step‐up regulator. The device allows use of small inductors and output capacitors. The current‐mode control scheme provides fast transient response and good output voltage accuracy.

At light loads, the EC4514 will automatically enter in Pulse Skip Mode (PSM) operation to reduce the dominant switching losses. During PSM operation, the IC consumes very low quiescent current and maintains high efficiency over the complete load range.

The EC4514 also includes current‐limit and over‐temperature shutdown to prevent damage in the event of an output overload.

Features

 

 

  • Wide 2.6V to 6V Input Voltage Range

  • Built‐in 125mΩ N‐Channel MOSFET

  • Built‐in Adjustable Soft‐Start Function

  • High Efficiency up to 90%

  • Current‐Mode Operation

‐Stable with Ceramic Output Capacitors

‐Fast Transient Response

  • Current‐Limit Protection

  • Over‐Temperature Protection with Hysteresis

  • Built in EN Function For Timing Control

  • Selectable Frequency 600kHz/1.2MHz

  • Available in DFN3x3‐10 Package

  • Lead Free and Green Devices Available (RoHS Compliant)

 

Applications

 

  • Panel

  • IEEE1394 Port

  • Thunderbolt Application

  • Boost Regulators

Pin Configurations

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​  ​​ ​​​​ Figure1 Pin Configuration of EC4514(Top View)

 

 

 

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EC4514

24V, 4A Asynchronous Boost Converte

Pin Description

 

Pin Number

Pin Name

Description

 

1

 

COMP

Error Amplifier Output. Use this pin in combination with the FB pin to compensate

the voltage‐control feedback loop of the converter.

2

FB

Converter Feedback Input.

 

3

 

EN

Device Enable Control Input. Force VEN exceed 1.8V enable the device. Left VEN below

0.8V to shutdown.

4,5

GND

Signal and Power Ground. Connect this pin to exposed pad.

6,7

LX

Converter Switch Pin. Connect inductor and diode here.

8

VDD

Device Input Supply Voltage.

 

9

 

RT

Operation Frequency Setting. Force VRT exceeds 1.8V set the oscillator operates at

1.2MHz. Pull VRT below 0.8V at 600kHz

10

SS

Soft Start Output. Connect a capacitor to GND to set the soft start interval.

Exposed Pad(11)

GND

Signal Ground. Tie this pin to the GND.

 

Ordering Information

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ EC4514NN  ​​​​ □  ​​​​ □

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ 

 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ Circuit Type  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ Packing:

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 ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ FN: DFN  ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​ ​​​​ R: Tape and Reel

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Marking rule:

Part Number

Package

Marking

Marking Information

EC4514NNFNR

DFN 3x3-10

4514

LLLL

1.LLLLLast four number of Lot No

 

Function Block

 

Figure 2 Function Block Diagram of EC4514

Absolute Maximum Ratings(Note 1)

 

Symbol

Parameter

Rating

Unit

VDD

Converter Supply Voltage (VDD to GND)

‐0.3 to 7

V

VLX

LX to GND Voltage

‐0.3 to 28

V

 

COMP, FB, EN, RT, SS to GND Voltage

‐0.3 to 7

V

 

PGND to GND (4,11: Signal GND, 5: PGND)

‐0.3 to +0.3

V

PD

Power Dissipation

Internally Limited

W

TJ

Maximum Junction Temperature

150

oC

TSTG

Storage Temperature Range

‐65 to 150

oC

TSDR

Maximum Lead Soldering Temperature, 10 Seconds

260

oC

Note1: Stresses beyond 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 rating conditions for extended periods may affect device reliability.

 

Recommended Operating Conditions(Note 3)

 

Symbol

Parameter

Range

Unit

VOUT

Output and IC Supply Voltage (VOUT to GND)

2.6 to 24

V

VDD

Converter Supply Voltage (VDD to GND)

2.6 to 5.5

V

TA

Ambient Temperature

‐40 to 85

oC

TJ

Junction Temperature

‐40 to 125

oC

Note 3: Please refer to the typical application circuit.

 

 

Thermal Characteristics

 

Symbol

Parameter

Typical Value

Unit

JA

Junction‐to‐Ambient Resistance in free air (Note 2)

DFN3x3‐10

55

JC

Junction‐to‐Case Resistance

DFN3x3‐10

20

Note 2: JA is measured with the component mounted on a high effective thermal conductivity test board in free air.

 

Electrical Characteristics

Refer to the typical application circuits. These specifications apply over. VDD=3.3V, VOUT=12V, TA=25°C.

Symbol

Parameters

Test Condition

Min.

Typ.

Max.

Unit

SUPPLY VOLTAGE AND CURRENT

 

Converter Supply Voltage Range

 

2.6

5.5

V

VDD

Converter Supply Voltage Range

18V < VOUT < 24V

4

5.5

V

VOUT

Converter Output Voltage

 

2.6

24

V

 

VDD Under Voltage Lockout

VDD Rising

 

 

 

 

 

Threshold

2.2

2.4

2.6

V

VUVLO

VDD Under Voltage Lockout

VDD Falling

 

 

 

 

 

Hysteresis

0.2

V

IDD1

No Switching Quiescent Current

VFB = 1.3V

0.5

mA

IDD2

Switching Quiescent Current

VFB = 1V

4

mA

IDD3

Shutdown Quiescent Current

EN=GND

0.2

4

uA

ERROR AMPLIFIER

VREF

Regulated Feedback Voltage

 

1.22

1.24

1.26

V

IFB

FB Input Leakage Current

VFB=1.3V

‐100

100

nA

 

FB Line Regulation

VDD=2.7~5.5V, IOUT=0.2A

‐0.05

%/V

RSENSE

Current Sense Transresistance

 

0.25

V/A

gm

Compensation Network

VDD=3.3V~5V

135

uA/V

 

COMP Pull Low Resistance

EN=GND

1

kΩ

INTERNAL POWER SWITCH

FOSC

Switching Frequency

RT=GND

450

600

750

kHz

 

 

RT=VDD

900

1200

1500

kHz

RN‐FET

N‐FET Switch On Resistance

VDD=3.3V

125

150

mΩ

 

N‐FET Current Limit

VDD=3V~5.5V

4

5

6

A

DMAX

SW Maximum Duty Cycle

 

85

90

95

%

 

Minimum On‐time

 

150

ns

 

LX Leakage Current

VLX=24V, VFB=1.3V

1

10

uA

SOFT‐START

ISS

SS Charge Current

 

4

uA

CONTROL STAGE

EN

EN Input Low Threshold

 

0.8

V

 

EN Input High Threshold

 

1.8

V

RT

RT Input Low Threshold

 

0.8

V

 

RT Input High Threshold

 

1.8

V

PROTECTION

TOTP

Over Temperature Protection (note 4)

TJ Rising

150

 

Over Temperature Protection

 

 

 

 

 

Hysteresis(note 4)

TJ Falling

30

Note 4: Guaranteed by design, not production tested.

 

Typical Application Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Typical Operating Characteristics