PDF《Power》

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) avail- able 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 per- formance and one (LDO4) with very low quiescent current that is supplied by an external backup battery. A Low Power Bandgap (LPBG) requiring no external capaci- tor for decoupling, is used as reference voltage for LDO4 and starts when VBAT is present. LDO4 regulates output voltage with extremely low quiescent current, maxi- mizing 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 con- sumption 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. The AT73C239 features a Two-wire Interface (TWI) to increase the efficiency of the system by disabling LDOs when not needed. Power Management for Mobiles (PM) AT73C239 4-channel Power Management for Wireless Modules Summary 6201ASCPMAACC24-Oct-05

2 6201ASCPMAACC24-Oct-05 AT73C239 Summary 2. Block Diagram Figure 2-1. AT73C239 Functional Block Diagram HPBG LPBG Internal Oscillator Reset Generator TWI State Machine LDO1 VDD 3.0V-3.6V VOUT 1.8V or 2.75V ILOAD

25 mA Fuse1 POR1 Fuse2 POR1 VMON VDD1 VO1 LDO2 VDD 3.0V-3.6V VOUT 1.5V or 1.8V ILOAD

30 mA VDD2 VO2 LDO3 VDD 3.0V-3.6V VOUT 1.23V or 1.5V or 1.8V ILOAD

60 mA VDD3 VO3 LDO4 VDD 2.5V-3.6V VOUT 1.2V or 1.5V or 1.8V ILOAD

2 mA VBAT VBG VO4 GNDA/AVSS XRESIN XRESO TWCK TWD GNDD VZAP

3 6201ASCPMAACC24-Oct-05 AT73C239 Summary Revision History Doc. Rev Date Comments Change Request Ref. 6201AS 01-Sep-05 First issue Printed on recycled paper. Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN ATMEL'S TERMS AND CONDI- TIONS OF SALE LOCATED ON ATMEL'S WEB SITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT, CONSEQUENTIAL, PUNITIVE, SPECIAL OR INCIDEN- TAL DAMAGES (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF PROFITS, BUSINESS INTERRUPTION, OR LOSS OF INFORMATION) ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make changes to specifications and product descriptions at any time without notice. Atmel does not make any commitment to update the information contained herein. Unless specifically provided otherwise, Atmel products are not suitable for, and shall not be used in, automotive applications. Atmel's products are not intended, authorized, or warranted for use as components in applications intended to support or sustain life. Atmel Corporation Atmel Operations