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AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 1 - DESCRIPTION FEATURES The A7142 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving 2A load with excellent line and load regulation. These devices are available in fixed output voltages of 5V and an adjustable output versions. Requiring a minimum number of external components, these regulators are simple to use and include internal frequency compensation, and a fixed- frequency oscillator. The A7142 series operates at a switching frequency of 150KHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Some features include a guaranteed ± 4% tolerance on output voltage under specified input volt age and output load conditions, and ± 15% on the oscillator frequency. External shutdown is included, featuring typically 50 μA standby current. The output switch includes cycle -by-cycle current limiting, as well as thermal shutdown for full protection under fault conditions. The oscillator frequency reduces in the event of an output short or an overload which causes the regulat ed output voltage to drop approximately 40% from the nominal output voltage. The A7142 is available in SOP8 and PSOP8 packages.  5V and adjustable output versions  Adjustable version output voltage range, 1.23V to 37V ± 3% max over line and load conditions  Guaranteed 2A output current  Wide input voltage range  Requires only 4 external components  150 kHz fixed frequency oscillator  TTL shutdown capability, low power standby mode  Uses readily available standard inductors  Thermal shutdown and current limit protection  Available in SOP8 and PSOP8 Packages APPLICATION  Simple high-efficiency step-down (buck) regulator  On-card switching regulators  Positive to negative converter

ORDERING INFORMATION

XX: Output Voltage; 50=5.0V; ADJ=Adjustable V: Halogen free Package R: Tape & Reel AiT provides all RoHS products Suffix “V” means Halogen free Package TYPICAL APPLICATION Fixed Output Voltage Versions

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 2 - PIN DESCRIPTION Top View Top View Pin # Symbol Function

1 VIN Input Voltage Pin

2 VOUT Output Voltage Pin

3 FB Feed Back

4 ON/OFF Enable Pin

5,6,7,8 GND Ground Pin

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 3 - ABSOLUTE MAXIMUM RATINGS Maximum Supply Voltage 45V ON/OFF Pin Input Voltage -0.3V ≤ V ≤ +VIN FB Pin Voltage -0.3V ≤ V ≤ +VIN Output Voltage to Ground -0.8V Power Dissipation Internally Limited Storage Temperature Range -65 °C to +150 °C Maximum Junction Temperature 150 °C Minimum ESD Rating (C= 100pF, R = 1.5 kΩ) 2kV 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. RECOMMENDED OPERATING CONDITIONS Temperature Range -40°C ≤ TJ ≤ +125 °C Max Supply Voltage 40V ILOAD 2A

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 4 - ELECTRICAL CHARACTERISTICSNOTE1 VIN= 12V Unless otherwise specified Parameter Symbol Conditions Min. Typ. Max. Unit System Parameters (Test Circuit Figure 1) Output Voltage VOUT 7V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 2A (NOTE7) 5.0V 4.800 4.750 5.0 5.200 5.250 V 7V ≤ VIN ≤ 40V, 0.2A ≤ ILOAD ≤ 2A VOUT programmed for 5V (NOTE7) ADJ 1.193 1.180 1.230 1.267 1.280 V η VIN =12V, ILOAD =2A 5.0V 77 % VIN =12V, ILOAD =2A VOUT programmed for 5V ADJ 77 % All Output Voltage Versions Feedback Bias Current IFB VOUT =5V (Adjustable Version Only) (NOTE7) 50 100 500 nA Oscillator Frequency FO (NOTE6) (NOTE7) 130 120 150 170 180 kHz Saturation Voltage VSAT IOUT =2A (NOTE2) (NOTE7) 1.2 1.4 1.6 V Max Duty Cycle (ON) DC (NOTE3) 93 98 % Current Limit ICL Peak Current (NOTE2, 6) (NOTE7) 2.5 2.3 3.2 4.6 5.2 A Output Leakage Current IOL (NOTE4, 5): Output = 0V Output = -0.8V 0.4 mA Quiescent Current IQ (NOTE 4) 5 10 mA Standby Quiescent Current ISTBY ON/OFF Pin = 5V (OFF) 60 200 uA ON/OFF Control ON/OFF Pin Logic Input Level V IH VOUT=0V (NOTE7) 2.2 2.4 1.4 V VIL VOUT=Nominal Output Voltage (NOTE7) 1.2 1.0 0.8 V ON/OFF Pin Input Current IIH ON/OFF Pin = 5V (OFF) 12 30 uA IIL ON/OFF Pin = 0V (ON) 0 10 uA NOTE1: External components such as the catch diode, inductor, input and output capacitors can affect switching regulator system performance. NOTE2: Output pin sourcing current. No diode, inductor or capacitor connected to output. NOTE3: Feedback pin removed from output and connected to 0V. NOTE4: Feedback pin removed from output and connected to +12V for the adjustable and 5V, versions to force the output transistor OFF NOTE5: VIN =40V. NOTE6: The oscillator frequency reduces to approximately 36 kHz in the event of an output short or an overload which causes the regulated output voltage to drop approximately 40% from the nominal output voltage. This self protections feature lowers the average power dissipation of the IC by lowering the minimum duty cycle from 5% down to approximately 2%. NOTE7: denotes the specifications which apply over full operating temperature range TJ = -40…+125°C.

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 5 - TYPICAL PERFORMANCE CHARACTERISTICS ( Circuit of Figure 1) Figure 1. 1. Normalized Output Voltage 2. Line Regulation 3. Switch Saturation Voltage 4. Efficiency 5. Switching Waveforms ,VOUT =15V, A: Output Pin Voltage, 50V/div, B: Output Pin Current 2A/div, C: Inductor Current 2A/div, D: Output Ripple Voltage 50mv/div 6. Load Transient

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 6 - TEST CIRCUIT 1. Fixed Output Voltage Versions 2. Adjustable Output Voltage Version

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 7 - BLOCK DIAGRAM

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 8 -

PACKAGE INFORMATION

Dimension in SOP8 (Unit: mm) Symbol Min Max A 1.350 1.750 A1 0.100 0.250 A2 1.350 1.550 b 0.330 0.510 c 0.170 0.250 D 4.700 5.100 E 3.800 4.000 E1 5.800 6.200 e 1.270(BSC) L 0.400 1.270 θ 0° 8°

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 UPDATED - - 9 - Dimension in PSOP8 Package (Unit: mm) Symbol Min Max A 1.350 1.750 A1 0.050 0.150 A2 1.350 1.550 b 0.330 0.510 c 0.170 0.250 D 4.700 5.100 D1 3.202 3.402 E 3.800 4.000 E1 5.800 6.200 E2 2.313 2.513 e 1.270(BSC) L 0.400 1.270 θ 0° 8°

AiT Semiconductor Inc. www.ait-ic.com A7142 DC-DC CONVERTER/ BUCK (STEP-DOWN) SIMPLE SWITCHER POWER CONVERTER 150kHz, 2A PWM REV2.1 - JUN 2011 RELEASED, MAY 2016 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. Use 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.