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AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 1 - DESCRIPTION FEATURES The A7523 is a compact, high efficiency, and low voltage step- up DC/DC converter with an Adaptive Current Mode PWM control loop, includes an error amplifier, ramp generator, comparator, switch pass element and driver in which providing a stable and high ef ficient operation over a wide range of load currents. It operates in stable waveforms without external compensation. The low start -up input voltage below 1V makes A7523 suitable for 1 to 4 battery cells applications of providing up to 600mA output current. Besides, the 14μA low quiescent current together with high efficiency maintains long battery lifetime. The output voltage is set with two external resistors. Both internal 2A switch and driver for driving external power devices (NMOS or NPN) are provided. The A7523 is available in SOT-26 package.

ORDERING INFORMATION

V: Halogen free Package R: Tape & Reel AiT provides all RoHS products Suffix “ V “ means Halogen free Package  0.8V（Iout=1mA） Low Start-up Input Voltage  500kHz Fixed Switching Frequency  90% Efficiency  High Supply Capability to Deliver 3.3V 300mA with1 Alkaline Cell or Deliver 5V 800mA with 1 Li-ion Cell  14μA Quiescent (Switch-off) Supply Current  0.01μA Shutdown Mode Supply Current  Providing Flexibility for Using Internal and External Power Switches  Output voltage: Settable to between 2.0V to 6.0V ,accuracy of 2%  Available in SOT-26 package. APPLICATION  MP3  PDA  DSC  LCD Panel  RF-Tags  Portable Instrument  Wireless Equipment

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 2 - PIN DESCIPTION TOP VIEW Pin # Symbol Functions

1 CE Chip enable

2 EXT Output pin for driving external NMOS

3 GND Ground

4 LX Pin for switching

5 VDD Input positive power pin of A7523

6 FB Feedback input pin

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 3 - ABSOLUTE MAXIMUM RATINGS VDD, Input voltage Vss-0.3V～Vss+7V VOUT, Output voltage Vss-0.3V～Vss+7V VLX, Output voltage Vss-0.3V～Vss+7V IEXT, EXT pin Driver Current 200mA ILX, LX pin Switch Current 2.5A PD, Power dissipation 150mW TOPR, Operating ambient temperature -40℃～＋80℃ TSTG, Storage ambient temperature -40℃～＋125℃ Stress beyond above listed “Absolute Maximum Ratings” may lead permanent damage to the device. These are stress ratings only and operations of the device at these or any other conditions beyond those indicated in the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 4 -

ELECTRICAL CHARACTERISTICS

TA=25℃ unless otherwise specified Parameter Symbol Conditions Min Typ. Max Unit Operation start voltage VST IOUT=1mA 0.8 1.05 V VDD supply voltage VDD VDD pin voltage 2 6 V Shut down current IOFF CE=0,VIN=4.5V 0.01 1 μA Switch-off Current Iswitch-off VIN=6V 14 25 μA Continuous Switching Current Iswitch VIN=CE=3.3V,VFB=GND 180 250 450 mA No load Current Ino-load VIN=1.5V,VOUT=3.3V 56 μA Feedback Reference Voltage Vref Close Loop VDD=3.3V 1.225 1.25 1.275 V Switching Frequency Fs VDD=3.3V 425 500 575 KHz Maximum Duty Dmax VDD=3.3V 85 95 % LX on resistance VDD=3.3V 0.2 1.0 Ω Current Limit Setting Ilimit VDD=3.3V 1.0 1.5 2.0 A EXT on resistance to VDD VDD=3.3V 4 8.0 Ω EXT on resistance to GND VDD=3.3V 2.15 8.0 Ω Line Regulation ΔVline VIN=3.5~6V,IL=1mA 0.25 5 mV/V Load Regulation ΔVload VIN=2.5V,IL=1~100mA 0.5 mV/mA CE pin Trip level VDD=3.3V 0.4 0.8 1.2 V Temperature Stability for VOUT Ts 50 Ppm/℃ Thermal Shut down Hysterises ΔTsd 10 ℃

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 5 - TYPICAL PERFORMANCE CHARACTERISTICS Figure 1.Efficiency vs. Output Current Figure 2. Input current vs. Output current Figure3.Input Current vs. Input Voltage Figure4.Supply Current I(VIN) vs. Input Voltage Figure5．Switching Frequency vs. VDD pin Voltage Figure 6. Start up voltage vs. Output Current

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 6 - Figure7.LX pin wave form & Output Ripple Figure8.Transient Response Figure9．Output Voltage vs. Temperature

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 8 - BLOCK DIAGRAM

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 9 -

PACKAGE INFORMATION

Dimension in SOT-26 Package (Unit: mm) SYMBOL MIN MAX A 1.050 1.250 A1 0.000 0.100 A2 1.050 1.150 b 0.300 0.500 c 0.100 0.200 D 2.820 3.020 E 1.500 1.700 E1 2.650 2.950 e 0.950(BSC) e1 1.800 2.000 L 0.300 0.600 θ 0° 8°

AiT Semiconductor Inc. www.ait-ic.com A7523 DC-DC CONVERTERBOOST(STEP-UP) SUPER-SMALL PACKAGE PWM CONTROL STEP-UP SWITCHING REGULATOR REV1.1 - DEC 2011 RELEASED, FEB 2015 UPDATED - - 10 - IMPORTANT NOTICE AiT Semiconductor Inc. (AiT) reserves the right to make changes to any its product, specifications, to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. AiT Semiconductor Inc. 's integrated circuit products are not designed, intended, authorized, or warranted to be suitable for use in life support applications, devices or systems or other critical applications. Us e of AiT products in such applications is understood to be fully at the risk of the customer. As used herein may involve potential risks of death, personal injury, or servere property, or environmental damage. In order to minimize risks associated with the customer's applications, the customer should provide adequate design and operating safeguards. AiT Semiconductor Inc. assumes to no liability to customer product design or application support. AiT warrants the performance of its products of the specifications applicable at the time of sale.