APW7077ABI-TRG

APW7077/A PWM Step-Up DC-DC Converter Features • • • • • General Description Low Start-up Voltage 0.9V The APW7077/A series are multi- function PWM step-up DC-DC converter with an adaptive voltage mode controller and higher efficiency application from one to four cells battery packs. The APW7077/A series are set PWM operating mode, voltage-mode to follow portable application. And built-in driver pin, EXT pin, for connecting to an external transistor or MOSFET during light load, the device will automatically skip switching cycles to maintain high efficiency. The APW7077/A series consists of PW M controller, reference voltage, phase compensation, oscillator, soft-start, driver block. It will provide to operate suitable voltage without external compensation circuit. The APW7077/A series have fixed voltage and adjustable voltage version from a wide input voltage ranges 0.7V to 5.5V for step-up DC-DC converter. The start-up is guaranteed at 1V and the device is operating down to 0.7V. And providing up to 300mA loading current. Besides, low quiescent current (switch-off) is guaranteed. Fixed 300kHZ Operating Frequency Built-In Internal Soft Start Circuit Low Operating Current 3.3V and 5V ( ±2.5%) Fixed (APW7077) or Adjustable Output Voltage (APW7077A) • High Efficiency Up to 88% at 400mA Output Current • • • High Output Current Up to 1A Compact Package: SOT-23-5 Lead Free Available (RoHS Compliant) Applications • • • • • Cellular and Portable Phones Portable Audio Pinouts Camcorders and Digital Still Camera Hand-held Instrument PDAs EXT GND EXT GND 5 4 5 4 1 2 3 C E V OUT NC SOT-23-5 (Top View) APW7077 1 2 3 FB V DD CE SOT-23-5 (Top View) APW7077A ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Copyright  ANPEC Electronics Corp. Rev. A.4 - Sep, 2005 1 www.anpec.com.tw APW7077/A Ordering and Marking Information Package Code B : SOT-23-5 Temp. Range I : -40 to 85 ° C Handling Code TU : Tube TR : Tape & Reel Voltage Code R : 3.3V Z : 5.0V Lead Free Code L : Lead Free Device Blank : Original Device APW7077/A Lead Free Code Handling Code Temp. Range Package Code Voltage Code APW7077 B : 77RX APW7077A B : XX - Date Code, R : 3.3V A77X X - Date Code Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldiering operations. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature. Block Diagram VDD Phase Compensation VOUT V DD VDD NC PWM Controller Error Amp. RAMP GEN. Vref=1.0V Voltage Reference GND EXT Driver PWM Comp. Oscillator Soft-Start V DD CE APW 7077 VDD Phase Compensation VDD VDD VDD FB PWM Controller Error Amp. RAMP GEN. Voltage Reference GND Driver EXT PWM Comp. Oscillator Soft-Start VDD CE APW7077A Copyright  ANPEC Electronics Corp. Rev. A.4 - Sep, 2005 2 www.anpec.com.tw APW7077/A Absolute Maximum Ratings Symbol Parameter Value Unit VDD Supply voltage -0.3 to 7 V VIO Input / output pins (CE, FB, EXT) -0.3 to 7 V TA Operating Ambient Temperature Range -40 to 85 °C TJ Junction Temperature Range -40 to 150 °C TSTG Storage Temperature Range -65 to +150 °C TS Soldering Temperature 300, 10 seconds °C VESD Minimum ESD Rating ±2 kV Pin Descrpition Pin Number Pin Name Function Description 3 CE Chip enable input. High = operating mode; Low = shutdown mode 5 5 EXT External MOSFET or transistor drive pin. 4 4 GND Ground pins of the circuit. X 2 VDD Supply voltage. FB: Internal 1.0V reference voltage. Use a resistor divider to set X 1 FB the output voltage from and VOUT = 3 X NC No internal connection to the pin. 2 X VOUT VOUT Provides bootstrap power to the IC. APW7077 APW7077A 1  R2  1 +  R1   VFB. Thermal Characteristics Symbol R θJA Parameter Thermal Resistance − Junction to Ambient SOT-23-5 Copyright  ANPEC Electronics Corp. Rev. A.4 - Sep, 2005 3 Value Unit 200 °C/W www.anpec.com.tw APW7077/A Electrical Characteristics (for all values TA = 25°C, VOUT = 3.3V, unless otherwise noted) Symbol Parameter Test Condition APW7077A Min Typ Max Unit Step-Up Section VIN VDD Minimum Operating Input Voltage Operating Voltage Start-up Voltage fSW DMAX Operating Frequency Oscillator Frequency Line Regulation Maximum Duty Cycle VOUT = VDD VIN = VDD 0.9 1.9 Io