AD6475 ADV | Alldatasheet

Document overview

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Technical content

Features

◆ Low Quiescent Current: 2uA ◆ Operating Voltage Range: 2.5V-37V ◆ Output Current: 250mA ◆ Low Dropout Voltage:400mV@100mA(VOUT=3.3V) ◆ Output Voltage: 2.1~ 12V Block Diagram ◆ High Accuracy: ±2%/±1%(Typ.) ◆ High Power Supply Rejection Ratio:70dB@1kHz ◆ Low Output Noise:27xVOUT uV/RMS(10Hz~100kHz) ◆ Excellent Line and Load Transient Response ◆ Built-in Current Limiter,Short-Circuit Protection ◆ Over-Temperature Protection ◆ Stable with Ceramic or Tantalum Capacitor

Applications

◆ Cordless Phones Order Information ◆ Radio control systems AD6475AXXYZ ◆ Laptop, Palmtops and PDAs ◆ Single-lens reflex DSC ◆ PC peripherals with memory ◆ Wireless Communication Equipments ◆ Portable Audio Video Equipments ◆ Car Navigation Systems ◆ LAN Cards ◆ Ultra Low Power Microcontrollers PIN NAME FUNCTION PIN NUMBER SOT-23-3 SOT-89-3 M P VSS Ground 1 1 VOUT Output 2 3 VIN Power Input 3 2 DESIGNATOR SYMBOL DESCRIPTION A A Standard XX Integer OutputVoltage e.g.3.3V=X:3, X:3 P Package:SOT-89-3 Z - 2% Accuracy 1 1% Accuracy SOT23-3 1 2 1 2 3 SOT89-3

2 / 6 www.advsemi.com Ver.0.10 ADV ABSOLUTE MAXIMUM RATINGS(1) (Unless otherwise specified, TA=25°C) PARAMETER SYMBOL RATINGS UNITS Input Voltage(2) VIN -0.3~41 V Output Voltage(2) VOUT -0.3~13 V Power Dissipation SOT-23 PD 0.4 W SOT-89 0.6 W Operating Junction Temperature Range(3) Tj 150 °C Storage Temperature Tstg -65~150 °C Lead Temperature(Soldering, 10 sec) Tsolder 260 °C (1) 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-rated conditions for extended periods my affect device reliability. (2) All voltages are with respect to network ground terminal. (3) This IC includes over temperature protection that is intended to protect the device during momentary overload. Junction temperature will exceed 125°C when over temperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. RECOMMENDED OPERATING CONDITIONS PARAMETER MIN. NOM. MAX. UNITS Supply voltage at VIN 2.5 37 V Operating junction temperature range, Tj -40 125 °C Operating free air temperature range, TA -40 85 °C

3 / 6 www.advsemi.com Ver.0.10 ADV

ELECTRICAL CHARACTERISTICS

(VIN=VOUT+2V , CIN=COUT=1μF，TA=25C， u n les s o th erw is e specified) (4) Typical numbers are at 25°C and represent the most likely norm. (5)Vdif:The Difference Of Output Voltage And Input Voltage When Input Voltage Is Decreased Gradually Till Output Voltage Equals To 98% Of V OUT (E).

4 / 6 www.advsemi.com Ver.0.10 ADV TYPICAL APPLICATION CIRCUIT

APPLICATION INFORMATION

Selection of Input/ Output Capacitors In general, all the capacitors need to be low leakage. Any leakage the capacitors have will reduce efficiency, increase the quiescent current. A recent trend in the design of portable devices has been to use ceramic capacitors to filter DC-DC converter inputs. Ceramic capacitors are often chosen because of their small size,low equivalent series resistance (ESR) and high RMS current capability. Also, recently,designers have been looking to ceramic capacitors due to shortages of tantalum capacitors. Unfortunately, using ceramic capacitors for input filtering can cause problems. Applying a voltage step to a ceramic capacitor causes a large current surge that stores energy in the inductances of the power leads. A large voltage spike is created when the stored energy is transferred from these inductances into the ceramic capacitor. These voltage spikes can easily be twice the amplitude of the input voltage step. (See “Ceramic Input Capacitors Can Cause Overvoltage Transients”——Linear Technology applicat ion note 88, March 2001) Many types of capacitors can be used for input bypassing, however, caution must be exercised when using multilayer ceramic capacitors (MLCC). Because of the self-resonant and high Q characteristics of some types of ceramic capacitors, high voltage transients can be generated under some start-up conditions, such as connecting the LDO input to a live power source. Adding a 3Ω resistor in series with an X5R ceramic capacitor will minimize start-up voltage transients. The LDO also requires an output capacitor for loop stability. Connect a 1uF tantalum capacitor from OUT to GND close to the pins. For improved transient response, this output capacitor may be ceramic.

5 / 6 www.advsemi.com Ver.0.10 ADV TYPICAL PERFORMANCE CHARACTERISTICS

6 / 6 www.advsemi.com Ver.0.10 ADV D b E e A c 0.2 L D L e b E c A PACKAGE MECHANICAL DATA Sym bol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.400 1.600 0.055 0.063 b 0.320 0.520 0.013 0.197 b1 0.400 0.580 0.016 0.023 c 0.350 0.440 0.014 0.017 D 4.400 4.600 0.173 0.181 D1 1.550 REF 0.061 REF E 2.300 2.600 0.091 0.102 E1 3.940 4.250 0.155 0.167 e 1.500 TYP 0.060TYP e1 3.000 TYP 0.118TYP L 0.900 1.200 0.035 0.047 Sy mb ol Dimensions In Millimeters Dimensions In Inches Min Max Min Max A 1.100 1.300 0.043 0.051 A1 0.000 0.100 0.000 0.004 A2 1.050 1.150 0.041 0.045 b 0.350 0.550 0.014 0.022 c 0.110 0.170 0.004 0.007 D 2.800 3.000 0.110 0.118 E 1.600 1.640 0.063 0.065 E1 2.650 2.950 0.105 0.116 e 0.950 TYP. 0.037 TYP. e1 1.800 2.000 0.071 0.079 L 0.450 REF. 0.017 REF. θ 0° 9° 0° 9°