ADT7220 General Description The ADT7220 is a power supply chip with 3.3V 6 5 4 regulated output. It is composed of one PWM A33 controller and one LDO regulator. It provides the pure and excellent regulated output voltage. 1 2 3 Package outline of the ADT7220 Applications Features • Input voltage range : 7V to 15V • DC-DC Converter for 3.3V output • Regulated output voltage : 3.3V • CCD Camera module • 350mA output load current available • Navigation & Portable Devices • PWM controller with built-in compensation components • Externally composed LDO pass transistor • 500kHz fixed frequency internal oscillator • Over voltage protection • Small outline SOT-26 package (2.9mm x 1.6mm body) Typical Application Circuit VIN (12V) VIN DRV A33 C2 GND Q1 OUT OUT C3 PWM FB (ADT7220) L1 U1 C1 * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 1/6 http://www.ad-tech.co.kr ADT7220 Part List Component Description Type Value Composite type with a PNP transistor and schottky barrier diode IC FP103 Q1 PNP transistor Chip transistor MMBT589LT1 L1 Output filter inductor Chip inductor 47uH/590mA C1 Output filter capacitor Tantalum capacitor 47uF/10V C2 Bypass capacitor Tantalum capacitor 10uF/25V C3 Load capacitor for LDO Tantalum capacitor 1uF/10V U1*1 *1 : For cost down , it is possible to use discrete component with a PNP transistor and a schottky barrier diode. In this case, you make use the discrete components with proper electrical specification. Table A shows the required key electrical limits. It is recommended to use PNP and schottky barrier diode having equivalent specification in the Table A. Table A : Selection guide for the discrete components Component Parameter Ratings Unit Collector to Emitter Voltage -20 V Collector Current -2 A Repetitive Peak Reverse Voltage 30 V Average Rectified Current 700 mA PNP Schottky Barrier Diode Remarks Recommend ‘2SB1424’ by ROHM or Equivalent IC Recommend ‘RSX101M-30’ by ROHM or Equivalent Pin Configuration 1 3 A33 2 6 5 4 * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 2/6 http://www.ad-tech.co.kr ADT7220 Pin Description Pin No. Name I/O Type 1 VIN - P Power supply input 2 GND - G Ground 3 PWM O D Switching output 4 FB I A Feedback voltage input 5 OUT O A LDO output 6 DRV I/O A LDO pass transistor drive signal I : Input pin P : Power pin A : Analog pin O : Output pin G : Ground pin D : Digital pin Description IO : Input/Output pin Functional Block Diagram Internal REG. VIN OSC (500kHz) BIAS GND REF + + FB PWM - - ZIN PWM Modulator ERROR AMP PreDRIVER ZFB LDO DRV OUT * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 3/6 http://www.ad-tech.co.kr ADT7220 Absolute Maximum Ratings Parameter Symbol Min. Typ. Max. Unit VIN - - 23 V Power dissipation (Ta=70℃) (Note1) PDmax - - 265 mW Storage temperature TSTG -65 - +150 ℃ Junction temperature TJmax - - +150 ℃ Thermal resistance ΘJA - 301.2 - ℃/W Power supply voltage Note1. derate 301℃/W above +70℃. 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 in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Operating Ratings Parameter Symbol Min. Typ. Max. Unit Power supply voltage*2 VIN 7.0 12.0 15.0 V Operating temperature TOPR -20 - +85 ℃ Junction temperature TJ - - +125 ℃ Max. power dissipation (Ta=70℃)*1 PD - - 180 mW *1 This spec. indicates that junction temperature of the device is under 125℃. In specific applications , this is recommended under this power dissipation specification. *2 Maximum VIN operating range can be extended. In this case, maximum drive current is limited. For using VIN over 15V, refer to the Table B. Table B : Maximum drive current as maximum VIN operating voltage. VIN (V) 16 17 18 19 20 21 22 Drive current (㎃) 330 310 290 270 250 230 210 Electrical Characteristics (Ta=25℃, VIN=12V, unless otherwise noted) Parameter Condition Min. Typ. Max. Unit IO=0mA - 3 - mA IO=300mA - 10 15 mA Efficiency IO=300mA - 70 - % Oscillator frequency - 350 500 625 kHz 3.6 3.8 4.0 V 3.1 3.3 3.5 V Supply current, operating Note PWM controller Output voltage IO=300mA (measured at FB pin voltage) LDO Output voltage IO=300mA Output drive current - - 300 350 mA Load regulation IO=0 to 350mA - 150 - mV Line regulation VIN=7V to 15V, IO=350mA - 20 - mV * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 4/6 http://www.ad-tech.co.kr ADT7220 Typical Performance Characteristics Io vs. Efficiency (VIN=12V) 72 80 70 Efficiency (%) Efficiency (%) VIN vs. Efficiency (Io=300mA) 85 75 70 65 68 66 64 62 60 60 6 8 10 12 VIN (V) 14 16 0 200 Io (mA) 300 400 Temp vs. Frequency (VIN=12V / Io=300mA) Temp vs. Vout (VIN=12V / Io=300mA) 550 3.5 Frequency (KHz) 3.4 Vout (V) 100 3.3 3.2 540 530 520 510 500 3.1 0 20 40 60 Temp (℃) 80 100 0 20 40 60 Temp (℃) 80 100 * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 5/6 http://www.ad-tech.co.kr ADT7220 Package ; SOT-26, 2.9mm x 1.6mm body (units : mm) * This specifications are subject to be changed without notice Jun. 16. 2008 / Rev. 0.1 6/6 http://www.ad-tech.co.kr