APW7077AZBI-TUL

APW7077/A PWM Step-Up DC-DC Converter Features • • • • • • • • • Low Start-up Voltage 0.9V 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) General Description 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. Applications • • • • • Cellular and Portable Phones Portable Audio Camcorders and Digital Still Camera Hand-held Instrument PDAs Pinouts EXT GND EXT GND 5 1 2 4 3 5 1 2 4 3 C E V OUT NC FB V DD CE SOT-23-5 (Top View) APW7077 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 APW7077/A Lead Free Code Handling Code Temp. Range Package Code Voltage Code 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 APW7077A B : A77X X - Date Code APW7077 B : 77RX XX - Date Code, R : 3.3V Note : A NPEC 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 VOUT V DD Phase Compensation VDD NC PWM Controller Error Amp. Vref=1.0V RAMP GEN. PWM Comp. Oscillator Driver EXT GND V DD Voltage Reference Soft-Start CE APW 7077 VDD Phase Compensation VDD VDD VDD FB PWM Controller Error Amp. RAMP GEN. PWM Comp. Oscillator Driver EXT GND VDD Voltage Reference Soft-Start CE APW7077A Copyright © ANPEC Electronics Corp. Rev. A.4 - Sep, 2005 2 www.anpec.com.tw APW7077/A Absolute Maximum Ratings Symbol VDD VIO TA TJ TSTG TS VESD Supply voltage Input / output pins (CE, FB, EXT) Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range Soldering Temperature Minimum ESD Rating Parameter Value -0.3 to 7 -0.3 to 7 -40 to 85 -40 to 150 -65 to +150 300, 10 seconds ±2 Unit V V °C °C °C °C kV Pin Descrpition Pin Number APW7077 1 5 4 X X 3 2 APW7077A 3 5 4 2 1 X X Pin Name CE EXT GND VDD FB NC VOUT Function Description Chip enable input. High = operating mode; Low = shutdown mode External MOSFET or transistor drive pin. Ground pins of the circuit. Supply voltage. FB: Internal 1.0V reference voltage. Use a resistor divider to set the output voltage from and VOUT = No internal connection to the pin. VOUT Provides bootstrap power to the IC.  R2  1 +   R1    VFB. Thermal Characteristics Symbol R θJA Parameter Thermal Resistance − Junction to Ambient SOT-23-5 Value 200 Unit °C/W Copyright © ANPEC Electronics Corp. Rev. A.4 - Sep, 2005 3 www.anpec.com.tw APW7077/A Electrical Characteristics (for all values TA = 25°C, VOUT = 3.3V, unless otherwise noted) APW7077A Min Typ Max Symbol Step-Up Section VIN VDD Parameter Test Condition Unit Minimum Operating Input Voltage Operating Voltage Start-up Voltage VOUT = VDD VIN = VDD Io