As2014 by Nikuha

AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

FEATURES            

GENERAL DESCRIPTION

Efficiency: Up to 92% Switch Current: Up to 5A Input Voltage: 2.5V to 6V Output Voltage: 10V(max.) 1.2MHz Switching Frequency Very Low RDS(ON): 70mΩ Under-Voltage Lockout Protection Over-Temperature Protection Internal Soft Start 1uA Shutdown Current Accurate Reference: 0.6V Compact Package: SOT23-6L

The AS2014 is a high efficiency current-mode boost converter with a fixed operation frequency. The device integrates a very low RDS(ON) N channel Mosfet to reduce power loss and achieve high efficiency. The maximum efficiency is up to 92%. AS2014 can output 2.5A current when Vin is higher than 3.6V and output is 5V. 1.2MHz operation frequency minimizes L and C value, and internal compensation network reduces external components. SOT23-6L package provides the best solution for PCB layout area.

APPLICATIONS   

Digital Camera Battery Charger Portable Equipments

TYPICAL APPLICATION CIRCUIT

100

L 4.7uH

CIN

AS2014

10uF

OFF ON

GND 2

CCOMP 100pF

220K

CO1

0.1uF

VOUT

Rfb1 3

VIN =4.2V

CO2

22uFx2

Rfb2 30K

Efficiency (%)

VIN

Efficiency vs Load Current

VIN =3.6V

85 80 75 70 65

VOUT = 5V L= 4.7uH

60 55 50 0

0.5

1.5

Load Current (A)

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

PIN CONFIGURATION

TOP VIEW

GND

SYMBOL

FUNCTION

Switching Output; Connect the inductor and the schottky diode

GND

Ground;

Feedback; Enable Pin; A high input enables the device and a low input

disables the device. When not used, connect EN to IN for automatic startup.

Input Supply; Must be locally bypassed.

NC; No connected

BLOCK DIAGRAM IN

SW 1

5 Under Voltage Lockout Internal Compensation

OTP

Internal Soft Start

+ PWM -

EN Logic

Current Sense

Slope Compensation

Logic Control

Driver

Vref

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

ORDER INFORMATION

AS2014EGT Packing: T=T/R Package: G = SOT23-6L Operating Temperature: E = -40°C ~ +85°C Part Number AS2014

ABSOLUTE MAXIMUM RATINGS1)

(TA=25°C)

Parameter

Symbol

Input Voltage SW Voltage EN Voltage Thermal Resistance Storage Temperature Range Soldering Temperature, 10s

Rating

VIN VSW VEN θJA Tstg Tsold

1) Exceeding these ratings may damage the device.

Unit

-0.3 ~ 6.5 -0.5 ~12 -0.3 ~ VIN+0.3 220 -50~150 260

V V V °C/W °C °C

RECOMMENDED OPERATING CONDITIONS2) Parameter

Input Voltage Output Voltage Operating Temperature

Symbol VI VSW TOP

2) The device is not guaranteed to function outside of its operating rating.

AS2014 rev1.5 05/02/2015

Min 2.5 VIN -40

Max

Unit

6 10 +85

V V °C

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

ELECTRICAL CHARACTERISTICS

VIN=3.6V, VOUT=5.0V, IOUT=0.1A, TA=25°C; Unless otherwise noted.

Parameter

Feedback Voltage FB Pin Bias Current Under Voltage Lockout Shutdown Current Standby Current(no switching) Switching Frequency Maximum Duty Cycle EN Voltage EN Voltage Hysteresis EN Pin Bias Current Over Temperature Protection OTP Hyteresis

Symbol

Conditions

VFB

IBIAS(FB) VUVLO ISD ISTB fSW Dmax VEN VHY(EN) IBIAS(EN) TOTP THY(OTP)

VFB=0.7V VFB=0V

0.588 0.4 -

Min

0.600 0.05 2.1 0.1 100 1.2 90 90 130 20

Typ.

0.612 1 1 1.5 1 -

Max

Unit

Min

Typ.

Max

Unit

V uA V uA uA MHz % V mV uA °C °C

ELECTRICAL CHARACTERISTICS

VIN=3.6V, VOUT=5.0V, IOUT=0.1A, TA=25°C; Unless otherwise noted.

Parameter

Resistance3)

SW ON SW Current Limit SW Leakage Current Over Voltage Protection Soft Start Time3)

3) Guaranteed by design.

AS2014 rev1.5 05/02/2015

Symbol RDS(ON) ILIMIT ILEAK VOV tSS

Conditions

VSW=5V VOV Rising VIN Power On

70 5 0.01 10 400

1 -

mΩ

A uA V uS

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

TYPICAL PERFORMANCE CHARACTERISTICS

VIN=3.6V, VOUT=5V, L=4.7uH, TA=25°C; Unless otherwise noted.

Efficiency Load Regulation

Efficiency vs Load Current

100

VIN =4.2V

Output Voltage vs Load Current

5.20

VIN =3.6V

85 80

Output Voltage (V)

Efficiency (%)

75 70 65

VOUT = 5V L= 4.7uH

60 55

5.10

5.00

VIN=3.3V = 3.6V L = 4.7uH

4.90

50 0

0.5

1.5

4.80

Load Current (A)

0.5

1.5

Load Current (A)

Line Regulation Frequency vs. Supply Volt.

Output Voltage vs Supply Voltage

5.20

Oscillator Frequency vs Supply Voltage

5.10

Oscillator Frequency (MHz)

Output Voltage (V)

1.4

5.00

ILOAD=0.5A

4.90

4.80 2

1.3

1.2

ILOAD=0.5A

1.1

1 2

Supply Voltage (V)

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

TYPICAL PERFORMANCE CHARACTERISTICS (continued) VIN=3.6V, VOUT=5V, L=4.7uH, TA=25°C; Unless otherwise noted. Output Voltage Ripple (Iout=0.5A)

Output Voltage Ripple (Iout=2A)

Shutdown Through VIN

Start Up Through VIN

Transient Response

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

OPERATION OPERATION DESCRIPTION The AS2014 adopts fixed frequency, peak current mode boost regulator architecture to regulate output voltage. The operating principle of the AS2014 can be easily understood by referring to the functional block diagram. At the beginning of each oscillator cycle the MOSFET is turned on by the control circuit. To prevent sub-harmonic oscillations at duty cycle larger than 50%, a stabilizing ramp is added to the output of the current sense amplifier and the result is fed into the negative input of PWM comparator. When this voltage equals the output voltage of the error amplifier, the power MOSFET is turned off. The voltage at the output of the error amplifier is an amplified result of the difference between the 0.6V reference voltage and feedback voltage. In this way the peak current level keeps the output voltage in regulation. If the feedback voltage starts to drop, the output of the error amplifier increases, resulting in more current to flow through the power MOSFET, thus increasing the power delivered to the output. The AS2014 has internal soft start to avoid rush input current during the startup and also to avoid overshoot on the output. APPLICATION INFORMATION Because of the high integration in the AS2014, the application circuit based on this regulator is rather simple. Only input capacitor CIN, output capacitor COUT, Inductor L, Schottky diode D and feedback resistors(Rfb1 and Rfb2) need to be selected for the targeted applications. Feedback Resistor Divider Rfb1 and Rfb2 Chooser Rfb1 and Rfb2 to program the proper output voltage. To minimize the power consumption under light loads, it is desirable to chooser large resistance values for both Rfb1 and Rfb2. A value of between 10KÎŠ and 1MÎŠ is recommended for both resistors. If Rfb1=220KÎŠ is chosen, the Rfb2 can be calculated to be 30KÎŠ based on the the following equation: đ?&#x2018;&#x2026;đ?&#x2018;&#x2026;đ?&#x2018;&#x201C;đ?&#x2018;&#x201C;đ?&#x2018;&#x201C;đ?&#x2018;&#x201C; 2 =

đ?&#x2018;&#x2026;đ?&#x2018;&#x2026;đ?&#x2018;&#x201C;đ?&#x2018;&#x201C;đ?&#x2018;&#x201C;đ?&#x2018;&#x201C; 1 Ă&#x2014; 0.6đ?&#x2018;&#x2030;đ?&#x2018;&#x2030; đ?&#x2018;&#x2030;đ?&#x2018;&#x2030;đ?&#x2018;&#x201A;đ?&#x2018;&#x201A;đ?&#x2018;&#x201A;đ?&#x2018;&#x201A;đ?&#x2018;&#x201A;đ?&#x2018;&#x201A; â&#x2C6;&#x2019; 0.6đ?&#x2018;&#x2030;đ?&#x2018;&#x2030;

AS2014 rev1.5 05/02/2015

Input Capacitor CIN To minimize the potential nose problem, place a typical X5R or better grade ceramic capacitor really close to the IN and GND pins. Care should be taken to minimize the loop area formed by CIN, and IN/GND pins. In this case a 10uF low ESR ceramic is recommended. Output Capacitor COUT The output capacitor is selected to meet the output ripple noise requirements. Both steady state ripple and transient requirements must be taken into consideration when selecting this capacitor. For the best performance, it is recommended to use X5R or better grade ceramic capacitor with 10V rating and more than two pieces of 22uF capacitor. The ESR of the capacitor COUT is critical for low ripple and noise in the output voltage. Inductor L Selection The recommended values of inductor is 2.2uH to 10uH. Small size and better efficiency are major concerns for portable devices. The inductor should have low core loss at 1.2MHz and low DCR for better efficiency. To avoid inductor saturation current rating should be considered. Diode D Selection Schottky diodes is good choice for AS2014 because of its low forward voltage drop and fast reverses recovery in order to get better efficiency. The high speed rectification is also a good characterisitic of schottky diode for high switching frequency. The diode reverse breakdown voltage should be larger than the output voltage. Start-up and Inrush Current The AS2014 has internal soft start to limit the value of current through IN during the startup and also to avoid overshoot on the output. The soft start is realized by gradually increasing the output of error amplify during start-up.

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AS2014 1.2MHz, 5A Peak Current Step-up Converter PRELIMINARY SPECIFICATION SUBJECT TO CHANGE

PACKAGE INFORMATION (All Dimensions in mm) Package 6-Lead Plastic SOT23-6L 0.60 TYP

2.90±0.10

Pin 1

AAAA 1

1.20 TYP

2.60 TYP

1.60±0.10 2.80±0.20

1.35max.

0.35~0.50

0.95 BSC

1.40±0.20

0.15max.

0.30~0.60 0.15~0.21

NOTICE: The information in this document is subject to change without notice. Please contact AniSem for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating AniSemproducts into any application. AniSem will not assume any legal responsibility for any said applications.

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