Features • • • • • • • • • • • • • • • Main Supply 3.0V to 3.6V Independent 2.5V to 3.6V Auxiliary Supply for Backup Section Internal State Machine for Startup 25 mA/1.8V-2.75V Linear Low Drop Out Regulator with High PSRR and Low Noise (LDO1) 30 mA/1.5V-1.8V Linear Low Drop Out Regulator with High PSRR and Low Noise (LDO2) 60 mA/1.23V-1.5V-1.8V Linear Low Drop Out Regulator with High PSRR (LDO3) 2 mA/1.2V-1.5V-1.8V Linear Low Drop Out Regulator with Very Low Quiescent Current (LDO4) HPBG Economic High Performance Voltage Reference for LDO Supply to RF Sections LPBG Low Power Voltage Reference to LDO4 During Backup Battery Operation Internal Oscillator Generates Internal Master Clock Internal Reset Generator for Main Supply Additional External Reset Input Two Wire Interface (TWI) for Independent Activation and Output Voltage Programming for Each LDO Available in 3 x 3 x 0.9 mm 16-pin QFN Package Applications: GPS Modules, WLAN Devices, Wireless Modules 1. Description The AT73C239 is a 4-channel Power Supply Power Management Unit (PMU) available in a QFN 3 x 3 mm package. It is a fully integrated, low cost, combined Power Management device for wireless modules, GPS and WLAN devices. It integrates four Linear Low Drop Out (LDO) Regulators, three of which provide high-accuracy RF performance and one (LDO4) with very low quiescent current that is supplied by an external backup battery. A Low Power Bandgap (LPBG) requiring no external capacitor for decoupling, is used as reference voltage for LDO4 and starts when VBAT is present. LDO4 regulates output voltage with extremely low quiescent current, maximizing the lifetime of the backup battery. An Internal State Machine manages the startup of the other LDOs in the order of LDO3 then LDO1 then LDO2. An economic High Power Bandgap (HPBG) provides highly accurate, low noise voltage reference to LDOs 1, 2, 3. HPBG operates in switching mode thereby decreasing its current consumption and becomes inactive when not directly supplied by VIN current. When the RF LDOs are in idle mode, quiescent current is decreased to a minimum. Power Management for Mobiles (PM) AT73C239 4-channel Power Management for Wireless Modules Summary The AT73C239 features a Two-wire Interface (TWI) to increase the efficiency of the system by disabling LDOs when not needed. 6201AS–PMAAC–24-Oct-05 2. Block Diagram Figure 2-1. AT73C239 Functional Block Diagram LDO1 VBG HPBG VDD1 VDD 3.0V-3.6V VOUT 1.8V or 2.75V GNDA/AVSS ILOAD 25 mA VO1 Internal Oscillator XRESIN LDO2 XRESO Reset Generator TWCK TWI TWD State Machine GNDD VDD 3.0V-3.6V VOUT 1.5V or 1.8V ILOAD 30 mA Fuse1 VDD2 VO2 Fuse2 VZAP VMON POR1 VBAT VO4 POR1 VDD3 LDO4 LDO3 VDD 2.5V-3.6V VDD 3.0V-3.6V VOUT 1.2V or 1.5V or 1.8V VOUT 1.23V or 1.5V or 1.8V ILOAD 2 mA ILOAD 60 mA VO3 LPBG 2 AT73C239 Summary 6201AS–PMAAC–24-Oct-05 AT73C239 Summary Revision History Doc. Rev Date Comments 6201AS 01-Sep-05 First issue Change Request Ref. 3 6201AS–PMAAC–24-Oct-05 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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