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TPS78330DDCR Datasheet(PDF) 9 Page - Texas Instruments |
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TPS78330DDCR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 15 page TPS78327 GND EN IN OUT V IN V OUT 1 F m 1 F m 4.2Vto5.5V 2.7V On Off 90 80 70 60 50 40 30 20 10 0 5 10 20 30 40 50 60 70 80 90 100 DutyCycle(TimeinActiveMode)(%) Battery,V =3.0V TPS783,V =2.2V CC CC TPS783xx www.ti.com SBVS133 – FEBRUARY 2010 APPLICATION INFORMATION X5R- and X7R-type capacitors are best because they APPLICATION EXAMPLES have minimal variation in value and ESR over temperature. Maximum ESR should be less than The TPS783 family of LDOs is factory-programmable 1.0 Ω. With tolerance and dc bias effects, the to have a fixed output. Note that during startup or minimum capacitance to ensure stability is 1mF. steady-state conditions, it is important that the EN pin voltage never exceed VIN + 0.3V. EXTENDING BATTERY LIFE IN KEEP-ALIVE CIRCUITRY APPLICATIONS FOR MSP430 AND OTHER LOW-POWER MICROCONTROLLERS One of the primary advantages of a low quiescent current LDO is its extremely low energy requirement. Counter-intuitively, this requirement enables a longer battery life compared to using only the battery as an unregulated voltage supply for low-power microcontrollers such as the MSP430. Figure 19 illustrates the characteristic performance of an unregulated (3.0V) battery supply versus a regulated TPS783 supply for a typical MSP430 application. Figure 18. Typical Application Circuit INPUT AND OUTPUT CAPACITOR REQUIREMENTS Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1mF to 1.0mF low equivalent series resistance (ESR) capacitor across the input supply near the regulator. This capacitor counteracts reactive input sources and improves transient response, noise rejection, and ripple rejection. A higher-value capacitor may be necessary if large, fast rise-time load transients are anticipated, or if the device is not located near the power source. If source impedance is not sufficiently low, a 0.1mF input capacitor may be necessary to ensure stability. Calculated with an MSP430F model, operating at 6MHz. The TPS783 series are designed to be stable with Figure 19. Battery Life Comparison vs Duty Cycle standard ceramic capacitors with values of 1.0mF or for MSP430 Application larger at the output. Table 2 summarizes this comparison. Table 2. Battery Life Comparison vs Active Mode Time for MSP430 Application DUTY CYCLE TPS783xx BATTERY 1mA LDO CONDITION/PERFORMANCE (%) (NO. OF DAYS) (NO. OF DAYS) (NO. OF DAYS) Efficiency with VBAT = 3.0V and VCC = 2.2V (VO/VI) — 73% 100% 73% LDO quiescent current (IQ) — 0.5mA 0 1mA MSP430 active current — 2.19mA 3.09mA 2.19mA MSP430 low-power current — 0.5mA 0.6mA 0.5mA Active mode, 1 sec/hour 0.028 5742 6286 4373 Active mode, 10 sec/hour 0.28 1320 998 1085 Active mode, 100 sec/hour 2.8 151 106 148 Active mode, 1000 sec/hour 28 15.4 10.7 15.4 Active mode, 100% duty cycle (on all the time) 100 4.2 3.0 4.2 Copyright © 2010, Texas Instruments Incorporated 9 |
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