A7506 AITSEMI | Alldatasheet
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AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 1 - DESCRIPTION FEATURES The A7506 is synchronous, fixed frequency, step-up DC/DC converters delivering high efficiency in a SOT-26 package. Capable of supplying 3.3V at 100mA from a single AA cell input, the device contain an internal NMOS switch and PMOS synchronous rectifier. A switching frequency of 1.0MHz minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing external parts count. The A7506 features continuous switching at light loads. The device features low shutdown current of under 1uA. The A7506 is available in SOT-26 package High Efficiency: Up to 92% 1.0MHz Constant Switching Frequency 3.3V Output Voltage at IOUT=100mA from a Single AA Cell; 5.0V Output Voltage at IOUT=500mA from one Li battery. Low Start-up Voltage: 0.85V Integrated main switch and synchronous rectifier. No Schottky Diode Required 2.5V to 5V Output Voltage Range Automatic Pulse Skipping Mode Operation Tiny External Components <1µA Shutdown Current Available in SOT-26 package. APPLICATION Cellular and Smart Phones Microprocessors and DSP Core Supplies Wireless and DSL Modems MP3 Player Digital Still and Video Cameras Portable Instruments TYPICAL APPLICATION CIRCUIT Fig 1. Typical Application Circuit
ORDERING INFORMATION
SPQ: 3,000pcs/Reel E6 A7506E6R-XXX A7506E6VR-XXX Note XXX=Output Voltage, ADJ=Adjustable V: Halogen free Package R : Tape & Reel AiT provides all RoHS products
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 2 - PIN DESCRIPTION Top View Pin # Symbol Function 1 SW Power Switch Pin. It is the switch node connection to Inductor.
2 GND Ground Pin
Feedback Input Pin. Connect FB to the center point of the external resi stor divider. The feedback threshold voltage is 1.23V. SHDN Chip Shutdown Signal Input. Logic high is normal operation mode, Logic Low is Shutdown. Typically, this pin is connected to VIN through a 1MΩ resistor. 5 VOUT Power Output Pin. VOUT is held 0.6V below than VIN in shutdown.
6 VIN
Power Supply Input. Must be closely decoupled to GND, Pin 2, with a 10μF or greater ceramic capacitor.
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 3 - ABSOLUTE MAXIMUM RATINGS Input Supply Voltage -0.3V～+6V SW Voltage -0.3V～+6V FB, SHDN Voltages -0.3V～+6V VOUT Voltage -0.3V～+6V Package Thermal ResistanceNOTE1 θJA 220℃/W θJC 110℃/W Operating Temperature Range -40℃～+85℃ Storage Temperature Range -65℃～+150℃ Lead Temperature (Soldering, 10s) ＋260℃ Stresses above 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 in the Electrical Characteristics are not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 4 - ELECTRICAL CHARACTERISTICSNOTE2 VIN =1.2V, VOUT=3.3V, TA = 25°C, Test Circuit of Fig 1., unless otherwise specified. Parameter Conditions Min. Typ. Max. Unit Minimum Start-Up Voltage IOUT = 1mA - 0.85 1.05 V Minimum Operating Voltage V SHDN = VIN - 0.75 - V Output Voltage Range 2.5 - 5 V Feedback Voltage -40oC ≤TA≤ 85oC 1.192 1.230 1.268 V Quiescent Current(Shutdown) V SHDN = 0V - 0.01 1 µA Quiescent Current(Active) Measured on VOUT - 300 500 µA NMOS Switch Leakage VSW = 5V - 0.1 5 µA PMOS Switch Leakage VSW = 0V - 0.1 5 µA NMOS Switch ON Resistance VOUT = 3.3V - 0.40 - Ω VOUT = 5V - 0.35 - Ω PMOS Switch ON Resistance VOUT = 3.3V - 0.70 - Ω VOUT = 5V - 0.60 - Ω Output Voltage VOUT = 3.3V, IOUT = 1mA 3.201 3.300 3.399 V VOUT = 5V , IOUT = 1mA, VIN = 2.4V 4.850 5.000 5.150 V Line Regulation VIN = 0.8V to 3.0V, IOUT = 10mA - 1 - %/V Load Regulation IOUT = 1mA to 100mA - 0.02 - %/mA NMOS Current Limit 600 850 - mA Current Limit Delay to Output NOTE3 - 40 - ns Max Duty Cycle VFB = 1.15V, -40℃ ≤TA≤ 85℃ 80 85 - % Switching Frequency - 1.0 - MHz SHDN Input Threshold 0.35 0.60 1.50 V SHDN Input Current V SHDN = 5.5V - 0.01 1 µA NOTE1: Thermal Resistance is specified with approximately 1 square of 1oz copper. NOTE2:100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization. NOTE3: Guaranteed by design.
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 5 - TYPICAL PERFORMANCE CHARACTERISTICS 3. Iq vs.VIN @VOUT=5V 4. Output Voltage Accuracy vs. IOUT 5. Transient response VIN=1.8V,VOUT=3.3V,IOUT=0-100mA 6. Transient response VIN=2.4V,VOUT=3.3V,IOUT=0-100mA
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 6 - BLOCK DIAGRAM
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 7 - DETAILED INFORMATION Operation The A7506 is 1.0MHz, synchronous boost converter housed in a SOT-26 package. Able to operate from an input voltage below 1V, the device features fixed frequency, current mode PWM control for exceptional line and load regulation. With its low R DS (ON) and gate charge internal MOSFET switches, the device maintains high efficiency over a wide range of load current. Detailed descriptions of the operating modes follow. Operation can be best understood by referring to the Block Diagram. Synchronous Rectification The A7506 integrates a synchronous rectifier to improve efficiency as well as to eliminate the external Schottky diode. The synchronous rectifier is used to reduce the conduction loss contributed by the forward voltage of Schottky diode. The synchronous rectifier is realized by a P-ch MOSFET with gate control circuitry that incorporates relatively complicated timing concerns. Low Voltage Start-Up The A7506 will start up at a typical VIN voltage of 0.85V or higher. The low voltage start -up circuitry controls the internal NMOS switch up to a maximum peak inductor current of 850mA (typical), with an approximate1.5us off -time during start -up, allowing the devices to start up into an output load. Once V OUT exceeds 2.3V, the start-up circuitry is disabled and normal fixed frequency PWM operation is initiated. In this mode, the A7506 operate independent of V IN, allowing extended operating time as the battery can droop to several tenths of a volt without affecting output voltage regulation. The limiting factor for the application becomes the ability of the battery to supply sufficient energy to the output. Low Noise Fixed Frequency Operation Oscillator: The frequency of operation is internally set to 1.0MHz. Error Amp: The error amplifier is an internally compensated trans-conductance type (current output) with a trans-conductance (gm) = 33 micro-siemens. The internal 1.23V reference voltage is compared to the voltage at the FB pin to generate an error signal at the output of the error amplifier. A voltage divider from VOUT to ground programs the output voltage via FB from 2.5V to 5V using the equation: VOUT = 1.23V • [1 + (R1/R2)] Current Sensing: A signal representing NM OS switch current is summed with the slope compensator. The summed signal is compared to the error amplifier output to provide a peak current control command for the
signal is blanked for 40ns to enhance noise rejection. current from reversing in polarity improving efficiency at light loads. voltage drop, the device will automatically switch back to normal PWM mode and maintain regulation. Table 1. Resistor selection for output voltage setting is the switching frequency, L is the inductance value and D is the duty cycle.
Table 2. Typical Surface Mount Inductors The output capacitor is required to keep the output voltage ripple small and to ensure regulation loop stability. ESR and high ripple current ratings.
high power applications. Large area of copper has lower resistance and helps to dissipate heat on the device. an example PCB layout for A7506. Figure 4. A7506 PCB layout
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 11 - PACKAGING INFORMATION Dimension in SOT-26 (Unit: mm) Symbol Millimeters Inches Min Max Min Max A 1.050 1.250 0.041 0.049 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.300 0.500 0.012 0.020 c 0.100 0.200 0.004 0.008 D 2.820 3.020 0.111 0.119 E 1.500 1.700 0.059 0.067 E1 2.650 2.950 0.104 0.116 e 0.950 BSC 0.037 BSC e1 1.800 2.000 0.071 0.079 L 0.300 0.600 0.012 0.024 θ 0° 8° 0° 8°
AiT Semiconductor Inc. www.ait-ic.com A7506 DC-DC CONVERTER BOOST(STEP-UP) VIN AS LOW AS 0.85V MICRO-POWER SYNC REV2.1 - APR 2009 RELEASED, OCT 2019 UPDATED - - 12 - 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 inform ation 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, device s 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 dea th, personal injury, or server e property, or environmental damag e. 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.