Texas Instruments REG104 Data Handbook/Specifications

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REG104

REG104

REG104

SBVS025G – SEPTEMBER 2001 – REVISED SEPTEMBER 2005

1A Low-Dropout Regulator

FEATURES DESCRIPTION NEW DMOS TOPOLOGY: The REG104 is a family of low-noise, low-dropout linear Ultra Low Dropout Voltage: regulators with low ground pin current. Its new DMOS topol- 230m V typ at 1A and 3.3V Output ogy provides significant improvement over previous designs, Output Capacitor NOT Required for Stability including low dropout voltage (only 230m V typ at full load), and better transient performance. In addition, no output

FAST TRANSIENT RESPONSE

capacitor is required for stability, unlike conventional low

VERY LOW NOISE: 33µVRMS

dropout regulators that are difficult to compensate and

HIGH ACCURACY: ±2% max require expensive low ESR capacitors greater than 1µF. HIGH EFFICIENCY: Typical ground pin current is only 1.7m A (at IOUT = 1A) and IGND = 1.7m A at IOUT = 1A drops to 0.5µA in not enabled mode. Unlike regulators with Not Enabled: IGND = 0.5µA PNP pass devices, quiescent current remains relatively con-

2.5V, 2.7V, 3.0V, 3.3V, 5.0V AND stant over load variations and under dropout conditions.

ADJUSTABLE OUTPUT VERSIONS The REG104 has very low output noise (typically 33µVRMS

THERMAL PROTECTION for VOUT = 3.3V with CNR = 0.01µF), making it ideal for use in portable communications equipment. On-chip trimming

SMALL SURFACE-MOUNT PACKAGES:

results in high output voltage accuracy. Accuracy is main-

SOT223-5, DDPAK-5

tained over temperature, line, and load variations. Key pa- rameters are tested over the specified temperature range APPLICATIONS (–40°C to +85°C). The REG104 is well protected—internal circuitry provides a

PORTABLE COMMUNICATION DEVICES

current limit which protects the load from damage. Thermal

BATTERY-POWERED EQUIPMENT

protection circuitry keeps the chip from being damaged by

MODEMS

excessive temperature. The REG104 is available in the

BAR-CODE SCANNERS DDPAK-5 and the SOT223-5. BACKUP POWER SUPPLIES

Enable Enable

VOUTVIN VOUTVIN

REG104

0.1µF (1) (1) (Fixed Voltage COUT 0.1µF REG104-A COUT

Versions) Adj

NR R2

Gnd Gnd

NR = Noise Reduction

NOTE: (1) Optional.

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.

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PRODUCTION DATA information is current as of publication date. Copyright © 2001-2005, Texas Instruments Incorporated Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.

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