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REG104FA-3.3 Datasheet(PDF) 1 Page - Texas Instruments |
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REG104FA-3.3 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 23 page DMOS 1A Low-Dropout Regulator FEATURES q NEW DMOS TOPOLOGY: Ultra Low Dropout Voltage: 230mV typ at 1A and 3.3V Output Output Capacitor NOT Required for Stability q FAST TRANSIENT RESPONSE q VERY LOW NOISE: 33 µV RMS q HIGH ACCURACY: ±2% max q HIGH EFFICIENCY: IGND = 1.7mA at IOUT = 1A Not Enabled: IGND = 0.5µA q 2.5V, 2.7V, 3.0V, 3.3V, 5.0V AND ADJUSTABLE OUTPUT VERSIONS q THERMAL PROTECTION q SMALL SURFACE-MOUNT PACKAGES: SOT223-5, DDPAK-5 APPLICATIONS q PORTABLE COMMUNICATION DEVICES q BATTERY-POWERED EQUIPMENT q MODEMS q BAR-CODE SCANNERS q BACKUP POWER SUPPLIES DESCRIPTION The REG104 is a family of low-noise, low-dropout linear regulators with low ground pin current. Its new DMOS topol- ogy provides significant improvement over previous designs, including low dropout voltage (only 230mV typ at full load), and better transient performance. In addition, no output capacitor is required for stability, unlike conventional low dropout regulators that are difficult to compensate and require expensive low ESR capacitors greater than 1 µF. Typical ground pin current is only 1.7mA (at IOUT = 1A) and drops to 0.5 µA in not enabled mode. Unlike regulators with PNP pass devices, quiescent current remains relatively con- stant over load variations and under dropout conditions. The REG104 has very low output noise (typically 33 µV RMS for VOUT = 3.3V with CNR = 0.01µF), making it ideal for use in portable communications equipment. On-chip trimming results in high output voltage accuracy. Accuracy is main- tained over temperature, line, and load variations. Key pa- rameters are tested over the specified temperature range (–40 °C to +85°C). The REG104 is well protected—internal circuitry provides a current limit which protects the load from damage. Thermal protection circuitry keeps the chip from being damaged by excessive temperature. The REG104 is available in the DDPAK-5 and the SOT223-5. REG 104 REG104 REG104 (Fixed Voltage Versions) Enable Gnd 0.1 µF C OUT (1) + + V OUT V IN NR NR = Noise Reduction NOTE: (1) Optional. REG104-A Gnd Enable 0.1 µF + C OUT (1) + V OUT V IN R 2 R 1 Adj REG104 SBVS025G – SEPTEMBER 2001 – REVISED SEPTEMBER 2005 www.ti.com PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2001-2005, Texas Instruments Incorporated Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. |
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