TPS780/781 LDOs designed for the MSP430 December 2008 TPS780xx/781xx Low IQ LDO with Dual-Level Outputs Benefits • • • • • • Ultra-Low IQ: - 500nA typ (TPS780xx) - 1uA typ (TPS781xx) Drop out Voltage: 130mV @ 150mA Output Voltages: Fixed (1.5 to 4.2V) and Adjustable (1.22 to 5.25V) VSET Pin allows VOUT to Toggle Between Two Factory EEPROM Preset Values Stable with 1μF Ceramic Output Capacitor TSOT23-5, 2X2mm SON Packages Applications • • • • • Power Management - LDO TI MSP430 Attach Applications Wireless Handsets Portable Media Players Battery Operated Devices w/ extended sleep times VIN IOUT VOUT TPS780 2.2 – 5.5 TPS781 2.2 - 5.5 Device (V) (V) IQ (uA) VDO 150 1.5 – 4.2 0.5 130 150 1.5 – 4.2 1 130 (mA) (mV) Dynamic Voltage Scaling (DVS) Benefits of DVS Discrete DVS implementation VIN VOUT Power Supply GND VFB • Dynamically switch VOUT between 2 preset levels • Lower VCC results in lower IQ thus prolonging battery life • Integrated DVS eliminates power lost in the discrete components VCC MSP430 Or Equivalent I/O VSS DVS implementation with TPS780xx System Frequency Minimum Operating Voltage MSP430F21X1 Supply Voltage MSP430 Active Current (F Version) • Across VCC and Frequency – – IAM (mA) Current consumption of Active Mode vs. System Frequency (F-Version) I AM IAM = (IAM)[1MHz] x f(System)[MHz] ⎛ ⎝ ≡ ⎜ 175 ⋅ μA ⎞ ⋅V cc − 105μA⎟ ⋅Freq V ⎠ MSP430 “F Version” Active Mode Current (IAM) VCC vs. Operating Frequency 9 8 7 6 5 4 3 2 1 VCC - 3.6V VCC - 3.3V VCC - 2.7V VCC - 2.2V VCC - 1.8V 0 1 2 3 4 5 6 7 8 9 10 11 Operating Frequency (MHz) 12 13 14 15 16 Runtime Calculations • Input Power – CR2032 Lithium Coin Cell • MSP430 – Clock 6MHz – VCC > 2V for 6MHz clock Specifications for CR2032 Nominal Voltage (V) 3 Nominal Capacity (mAh) 220 Continuous Drain (mA) 0.2 Operating Temp (oC) -30 ~ +60 Comparison of Battery Life TPS780 vs. CR2032 Coin Cell Battery Life Comparison Calculated assuming a MSP430 “F” Version operating @ 6Mhz. 90 80 70 60 Battery Life 50 Battery VCC 3.0V (Days) (Days) 40 TPS780 VCC 2.2V (Days) 30 20 10 0 5 10 20 30 40 50 60 Duty Cycle (%) (Time in Active Mode) 70 80 90 100 Battery Life Comparison for MSP430F2619 TPS780 vs. Battery, 1uA LDO and 20uA LDO TPS780 (Days) Battery (Days) 1uA LDO (Days) 20uA LDO (Days) 73% 100% 73% 73% 0.5uA 0 1uA 20uA 2.19mA 3.09mA 2.19mA 2.19mA MSP430 Low Power current 0.5uA 0.6uA 0.5uA 0.5uA Active Mode 1 sec/hour 5742 6286 4373 434 Active Mode 10 sec/hour 1320 998 1085 346 Active Mode 100 sec/hour 151 106 148 114 Active Mode 1000 sec/hour 15.4 10.7 15.4 14.9 Active Mode all the time 4.2 3.0 4.2 4.2 Efficiency with VBAT=3.0 VCC=2.2V LDO Quiescence Current (IQ) MSP430 Active current DVS Offerings VIN IOUT VOUT (V) IQ (uA) VDO (mV) Package TPS780330220 2.2 - 5.5 150 3.3 / 2.2 0.5 130 TSOT-23/SON 6 TPS780230300 2.2 - 5.5 150 2.3 / 3.0 0.5 130 SON 6 TPS780300250 2.2 - 5.5 150 3.0 / 2.5 0.5 130 SON 6 TPS780270200 2.2 - 5.5 150 2.7 / 2.0 0.5 130 TSOT-23 TPS78001 2.2 - 5.5 150 1.22 - 5.25V 1.7 130 TSOT-23/SON 6 TPS781330220 2.2 - 5.5 150 3.3 / 2.2 1 130 TSOT-23/SON 6 TPS78101 2.2 - 5.5 150 1.22 - 5.25V 2.7 130 TSOT-23/SON 6 TPS728185315 2.7 - 6.5 200 1.85 / 3.15 45 230 SON 6/WCSP Device (V) (mA)