SC900AMLTRT

SC900A Programmable Penta ULDO with RESET and I2C Interface POWER MANAGEMENT Description Features The SC900A is a highly integrated power management device for low power portable applications. The device contains five adjustable low-dropout linear regulators (LDOs) with CMOS pass-devices as well as a band-gap reference, I2C interface, and DACs to control the output voltages. ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ ‹ Many features of the SC900A are programmable through the I2C interface. These include the ability to independently turn on any combination of the five regulators. All five of the LDO output voltages are programmable in 50mV steps from 1.45V to 3.00V for LDOs A and B, and from 1.75V to 3.30V for LDOs C, D and E. Each LDO can have an active shutdown or nonactive shutdown program option through the interface. There is also a reset monitor flag that is associated with LDOA. In addition, the device has a separate programmable power good monitor flag that activates when one or more LDOs go out of regulation. Five LDO regulators in one package I2C interface with multiple device capability Independent I2C enable/disable of LDOs Independent I2C control of output voltages Low thermal impedance of 40°C per watt 150mV dropout at 150mA Input range from 2.7V to 5.5V Programmable power good flag Minimal number of external components Over temperature protection Small 4mm x 4mm 20-lead MLPQ package Small input/output filter capacitors Programmable VOUT range 1.45V to 3.00V for LDOs A and B 1.75V to 3.30V for LDOs C, D and E Applications The SC900A offers significant quiescent current and space savings to the system designer by sharing reference and biasing among five LDOs. The small and thermally efficient 20-lead MLPQ package make it ideal for use in portable products where minimizing layout area is critical. ‹ ‹ ‹ ‹ ‹ Palmtop/Laptop computers Personal Digital Assistants Cellular telephones Battery-powered equipment High efficiency linear power supplies Typical Application Circuit SC900A 4.7uF + - VBAT VIN INA INB INCD INE EN LDOPGD ARST SDA SCL A0 GND LDOE LDOD LDOA LDOB LDOC 2.2uF 2.2uF 2.2uF 2.2uF Baseband Processor VREF Receiver Section LNA 0.1uF TCXO & Synthesiser Audio Processing VASEL DGND Transmitter Section Keypad PA Digital Interface Camera Processing CCD 2.2uF November 14, 2005 1 www.semtech.com SC900A POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Parameter Symbol Maximum Units Input Supply Voltage VIN -0.3 to +7 V Digital Input Voltage VDIG -0.3 to VIN +0.3 V Operating Ambient Temperature Range TA -40 to +85 °C Operating Junction Temperature Range TJ -40 to +125 °C Peak IR Flow Temperature TLEAD 260 °C Storage Temperature TSTG -60 to +150 °C θJA 40 °C/W ESD 2 kV Thermal Impedance Junction to Ambient(1) ESD Protection Level(2) (1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad as per JESD51 standards. (2) Tested according to JEDEC standard JESD22-A114-B. Electrical Characteristics Unless otherwise noted VIN = 3.7V, TA = -40 to +85°C. Typical values are at TA = +25°C. Parameter Symbol Conditions Min VIN All outputs < VIN - dropout 2.7 Typ Max Units 5.5 V 10 μA General Supply Voltage Quiescent Current Shutdown IQ-SHUTDOWN Supply Bypass Capacitor CVCC Per input pin 1 μF Digital Inputs VIL Digital Input Voltage Digital Input Current 0.4 VIH 1.6 IDIG -0.2 V V 0.2 μA 10 %LDOB Digital Outputs Digital Output Voltage(1) VOL ISINK= 1.2mA, V ≥ 1.8V VOH ISOURCE = 0.5mA, V ≥ 1.8V 2 90 98 %LDOB Referencing and Biasing Circuitry Quiescent Current Reference IQ-REF 25 μA Reference Voltage VREF 1.227 V VREF Start-Up Time IVREF 15 ms VREF Bypass Capacitor CVREF 0.1 μF © 2005 Semtech Corp. CVREF = 100nF 2 www.semtech.com SC900A POWER MANAGEMENT Electrical Characteristics (Cont.) Parameter Symbol Conditions Quiescent Supply Current IQ Quiescent Supply Current at Start-Up IQSUP Min Typ Max Units All LDOs active in default states 190 360 μA LDO A, B, C active in default states VOUT + 0.5V < VIN < 5.5V 125 LDO Regulators Current Limit ILIM Bypass Capacitor 250 410 μA 650 mA CBYP Ceramic, low ESR 2.2 VOAA 1.45V ≤ VOUT ≤ 3.00V VOUT + 0.2V ≤ VIN ≤ 5.5V IOUT = 1mA, TA = 25°C -3 +3 % IOUT = 1mA -2 +2 % IOUT = 1mA, TA = 25°C -3 +3 % VOUT + 0.5V ≤ VIN ≤ 5.5V, IOUT = 200mA -3.5 +3.5 % μF LDO Regulator A (Core Supply) Output Voltage Accuracy Output Voltage Accuracy at 2.80V (DAC = 11011) Output Voltage Accuracy at 1.80V (DAC = 00011) VOASA Output Voltage Accuracy at 2.80V (DAC = 11011) Maximum Output Current 200 IOMAXA mA VOA-HI VASEL - High 2.80 V VOA-LO VASEL - Low 1.80 V Line Regulation at 1.8V, 2.8V LINEREGA IOUT = 1mA, VOUT + 0.2V < VIN < 5.5V 2.5 12 mV Load Regulation at 1.8V, 2.8V LOADREGA 1mA < IOUT