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MAX8805YEWEEE+T Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX8805YEWEEE+T Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 21 page General Description The MAX8805Y/MAX8805Z high-frequency step-down converters are optimized for dynamically powering the power amplifier (PA) in WCDMA or NCDMA handsets. The devices integrate a high-efficiency PWM step-down converter for medium- and low-power transmission, and a 60m Ω typical bypass FET to power the PA directly from the battery during high-power transmission. Dual 200mA low-noise, high-PSRR low-dropout regulators (LDOs) for PA biasing are also integrated. Two switching frequency options are available—2MHz (MAX8805Y) and 4MHz (MAX8805Z)—allowing optimiza- tion for smallest solution size or highest efficiency. Fast switching allows the use of small ceramic 2.2µF input and output capacitors while maintaining low ripple voltage. The feedback network is integrated, further reducing external component count and total solution size. The MAX8805Y/MAX8805Z use an analog input driven by an external DAC to control the output voltage linearly for continuous PA power adjustment. At high duty cycle, the MAX8805Y/MAX8805Z automatically switch to the bypass mode, connecting the input to the output through a low-impedance (60m Ω typ) MOSFET. The user can also enable the bypass mode directly through a logic-control input. The LDOs in the MAX8805Y/MAX8805Z are designed for low-noise operation (35µVRMS typ). Each LDO is indi- vidually enabled through its own logic control interface. The MAX8805Y/MAX8805Z are available in a 16-bump, 2mm x 2mm WLP package (0.7mm max height). Applications WCDMA/NCDMA Cellular Handsets Wireless PDAs Smartphones Features ♦ PA Step-Down Converter 7.5µs (typ) Settling Time for 0.8V to 3.4V Output Voltage Change Dynamic Output Voltage Setting from 0.4V to VBATT 60m Ω pFET and 100% Duty Cycle for Low Dropout 2MHz or 4MHz Switching Frequency Low Output-Voltage Ripple 600mA Output Drive Capability 2% Maximum Accuracy Tiny External Components ♦ Dual Low-Noise LDOs Low 35µVRMS (typ) Output Noise High 70dB (typ) PSRR Guaranteed 200mA Output Drive Capability Individual ON/OFF Control ♦ Low 0.1µA Shutdown Current ♦ 2.7V to 5.5V Supply Voltage Range ♦ Thermal Shutdown ♦ Tiny 2mm x 2mm x 0.7mm WLP Package (4 x 4 Grid) 600mA PWM Step-Down Converters in 2mm x 2mm WLP for WCDMA PA Power ________________________________________________________________ Maxim Integrated Products 1 Ordering Information IN1A LX PAA 1 μH BATT 2.7V TO 5.5V AGND PA_EN REFIN EN1 EN2 IN2 BATT 2.7V TO 5.5V PA ON/OFF ANALOG CONTROL VPA 0.4V TO VBATT REFBP IN1B LDO1 ON/OFF LDO2 ON/OFF PAB LDO2 LDO1 VLDO2 UP TO 200mA PGND HP FORCED BYPASS 2.2 μF 2.2 μF MAX8805Z VLDO1 UP TO 200mA Typical Operating Circuit 19-0777; Rev 0; 4/07 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. + Denotes a lead-free package. T = Tape and reel package. * xy is the output voltage code (see Table 1 in the Output Voltages section). Note: All devices are specified over the -40°C to +85°C operat- ing temperature range. Pin Configuration appears at end of data sheet. PART PIN- PACKAGE PKG CODE SWITCHING FREQUENCY (MHz) MAX8805YEWExy+T* 16 WLP-16 W162B2+1 2 MAX8805ZEWExy+T* 16 WLP-16 W162B2+1 4 |
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