APW7075

APW7075 Step-Up Converter and LDO Combo Features • • • • Built-In a 500mA LDO and Synchronous Step-Up DC-DC Converter Built-In PWM/PFM Operating Mode Provided Dual Input Power Sources Connect FB to OUT for 3.3V Output Voltage or GND for 2.5V Output Voltage or an External Resistor Divider for Adjustable Output Voltage. General Description The APW7075 is a PWM/PFM, high-efficiency and step-up DC-DC converter with an integrated LDO input switch for dual mode application. During battery mode operation, the APW7075 acts as synchronous rectifier and step-up DC-DC converter with a fixed or adjustable output voltage. When the VIN pin sense 5V input voltage, the APW7075 is switched to LDO operation mode, maintaining the constant output voltage. The input voltage ranges from 0.6 V to 4.5V for stepup DC-DC converter. The start-up is guaranteed at1V and the device is operating down to 0.6V. When the device is at LDO operating mode, the suitable output voltage 3.3V and loading current 500mA for maximum power consumption are guaranteed. The APW7075 is suited for dual mode and portable battery powered appliance with low-battery detector. In dual-mode applications, the APW7075 draws power from any available 5V USB connection and reverts to battery power when the USB power is removed. • • • • • • • • • • Fixed 300KHz Operating Frequency High Efficiency Up to 94% at 200mA Output Current 0.6V to 4.5V Operating Voltage 1V Start Up Input Voltage Low Battery Voltage Detection Reverse Voltage Protection Internal Synchronous Rectifier Automatic Detection Input Voltage Compact SOP-8-P and TSSOP-8 Packages Lead Free Available (RoHS Compliant) Applications • • • • • Dual Mode Power System USB Peripheral Camcorders and Digital Camera Hand-held Instrument PDAs Pin Description TSSOP-8 Top View VIN FB SHDN LBI SOP-8-P Top View VIN FB SHDN LBI 1 2 3 4 8 7 6 5 OUT LX GND LBO 1 2 3 4 8 7 6 5 OUT LX GND LBO = Thermal Pad (connected to GND plane for better heat dissipation) 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.5 - Aug., 2005 1 www.anpec.com.tw APW7075 Ordering and Marking Information APW7075 Lead Free Code Handling Code Temp. Range Package Code APW7075 KA : APW7075 O : APW7075 XXXXX APW7075 XXXXX Package Code KA : SOP-8-P O : TSSOP-8 Temp. Range C : 0 to 70 °C Handling Code TU : Tube TR : Tape & Reel Lead Free Code L : Lead Free Device Blank : Original Device XXXXX - Date Code XXXXX - Date Code 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 VIN SHDN VDD FB Y VDD Current Limit Vref VDD P-MOS VDD Vref Q2 P-MOS A B C phase compensation Y Q1 VOUT A GND B R1,R2 C OUT VDD PWM/ PFM controller Drive Q3 Oscillator N-MOS voltage reference soft-start Q4 Vref 2 SHDN LX FB GND LBI LBO N-MOS Copyright © ANPEC Electronics Corp. Rev. A.5 - Aug., 2005 2 www.anpec.com.tw APW7075 Absolute Maximum Ratings Symbol VOUT VIO TA TJ TSTG TS Parameter Supply voltage(OUT to GND) Input / output pins Operating Ambient Temperature Range Junction Temperature Range Storage Temperature Range Soldering Temperature Value -0.3 to 6.0 -0.3 to 6.0 0 to 85 0 to 150 -65 to +150 300, 10 seconds Unit V V °C °C °C °C Thermal Characteristics Symbol R θJA Parameter Thermal Resistance − Junction to Ambient SOP-8 SOP-8-P TSSOP-8 Value 124 80 160 Unit °C/W Electrical Characteristics VBAT = 2V, FB = OUT (VOUT = 3.3V), RL = ∞, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C. Symbol Parameter Test Conditions APW7075 Min. Typ. Max. Unit Step-up section Minimum Operating Input VBAT Voltage (Note1) Operating Voltage Start-up Voltage FSW DMAX Operating Frequency Maximum PWM Duty Cycle RL = 3 K Ω VOUT = 3.3VX96% VOUT = 3.3VX96% ILX = 100mA ILX = 100mA 0.6 0.6 0.9 300 90 0.3 0.6 0.6 0.9 4.5 1 V V V kHz % Ω Ω Power MOSFET RDS(on)-N Active Switch ON Resistance Synchronous Switch on RDS(ON)-P Resistance Control Output Voltage Output Voltage Range FB = OUT, ILOAD = 0mA FB = GND, ILOAD = 0mA External divider 3.234 2.45 2.5 3.3 2.5 3.366 2.55 5.5 150 V V V mV VOUT VOUT(drop) VOUT Dropping Voltage (Note 2) VOUT = 3.3V, C OUT = 100µF Copyright © ANPEC Electronics Corp. Rev. A.5 - Aug., 2005 3 www.anpec.com.tw APW7075 Electrical Characteristics (Cont.) Unless otherwise noted these specifications apply over full temperature, 3.9V ≤VIN