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DMOS

1A Low-Dropout Regulator

FEATURES

● NEW DMOS TOPOLOGY:

Ultra Low Dropout Voltage:

230mV typ at 1A and 3.3V Output

Output Capacitor NOT Required for Stability

● FAST TRANSIENT RESPONSE

● VERY LOW NOISE: 33µV

RMS

● HIGH ACCURACY: ±2% max

● HIGH EFFICIENCY:

GND

= 1.7mA at I

OUT

= 1A

Not Enabled: I

GND

= 0.5µA

● 2.5V, 2.7V, 3.0V, 3.3V, 5.0V AND

ADJUSTABLE OUTPUT VERSIONS

● THERMAL PROTECTION

● SMALL SURFACE-MOUNT PACKAGES:

SOT223-5, DDPAK-5

APPLICATIONS

● PORTABLE COMMUNICATION DEVICES

● BATTERY-POWERED EQUIPMENT

● MODEMS

● BAR-CODE SCANNERS

● 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 1µF.

Typical ground pin current is only 1.7mA (at I

OUT

= 1A) and

drops to 0.5µA 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 33µV

RMS

for V

OUT

= 3.3V with C

= 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

(Fixed Voltage

Versions)

Enable

Gnd

0.1µF

OUT

(1)

OUT

NR = Noise Reduction

NOTE: (1) Optional.

REG104-A

Gnd

Enable

0.1µF

OUT

(1)

OUT

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.

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.

Summary of content (23 pages)

PAGE 1
REG104 REG 104 REG 104 SBVS025G – SEPTEMBER 2001 – REVISED SEPTEMBER 2005 DMOS 1A Low-Dropout Regulator FEATURES DESCRIPTION ● NEW DMOS TOPOLOGY: Ultra Low Dropout Voltage: 230mV typ at 1A and 3.3V Output Output Capacitor NOT Required for Stability ● FAST TRANSIENT RESPONSE ● VERY LOW NOISE: 33µVRMS ● HIGH ACCURACY: ±2% max ● HIGH EFFICIENCY: IGND = 1.7mA at IOUT = 1A Not Enabled: IGND = 0.5µA ● 2.5V, 2.7V, 3.0V, 3.3V, 5.
PAGE 2
ABSOLUTE MAXIMUM RATINGS(1) Supply Input Voltage, VIN ....................................................... –0.3V to 16V Enable Input Voltage, VEN ....................................................... –0.3V to VIN Feedback Voltage, VFB ........................................................ –0.3V to 6.0V NR Pin Voltage, VNR ............................................................. –0.3V to 6.0V Output Short-Circuit Duration ......................................................
PAGE 3
ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TJ = –40°C to +85°C At TJ = +25°C, VIN = VOUT + 1V (VOUT = 3.0V for REG104-A), VENABLE = 2V, IOUT = 10mA, CNR = 0.01µF, and COUT = 0.1µF(1), unless otherwise noted. REG104GA REG104FA PARAMETER OUTPUT VOLTAGE Output Voltage Range REG104-2.5 REG104-2.7 REG104-3.0 REG104-3.
PAGE 4
TYPICAL CHARACTERISTICS For all models, at TJ = +25°C and VENABLE = 2V, unless otherwise noted. OUTPUT VOLTAGE CHANGE vs IOUT (VIN = VOUT + 1V, Output Voltage % Change Referred to IOUT = 10mA at +25°C) DC DROPOUT VOLTAGE vs IOUT 350 0.8 300 +125°C 0.4 DC Dropout Voltage (mV) Output Voltage Change (%) 0.6 0.2 0 +25°C –0.2 –0.4 –0.6 –0.8 –55°C +125°C 250 +25°C 200 –55°C 150 100 50 –1 0 –1.
PAGE 5
TYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25°C and VENABLE = 2V, unless otherwise noted. LOAD TRANSIENT RESPONSE LINE TRANSIENT RESPONSE 50mV/div 500mV/div REG104-3.3 COUT = 0 500mV/div VOUT 1A VOUT 50mV/div COUT = 10µF ILOAD 6V VOUT COUT = 10µF VOUT VIN 5V 10µs/div 50µs/div LOAD TRANSIENT RESPONSE LOAD TRANSIENT RESPONSE REG104–A REG104–A CFB = 0.01µF, VOUT = 3.3V Load = 200mA, CFB = 0.01µF, VOUT = 3.3V 50mV/div 50mV/div 500mV/div 500mV/div 10mA REG104-3.
PAGE 6
TYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25°C and VENABLE = 2V, unless otherwise noted. GROUND PIN CURRENT, NOT ENABLED vs TEMPERATURE GROUND PIN CURRENT vs TEMPERATURE 3 1.8 VENABLE = 0V IOUT = 1000mA 1.6 2.5 2 IGND (µA) IGND (mA) 1.4 1.2 1 IOUT = 200mA 0.8 1.5 1 0.5 0.6 IOUT = 10mA 0.4 –60 –40 –20 0 20 40 60 80 100 0 –75 120 –50 –25 0 25 50 75 100 125 Temperature (°C) Temperature (°C) IADJUST vs TEMPERATURE GROUND PIN CURRENT vs IOUT 1.6 0.28 1.4 0.
PAGE 7
TYPICAL CHARACTERISTICS (Cont.) For all models, at TJ = +25°C and VENABLE = 2V, unless otherwise noted.
PAGE 8
BASIC OPERATION The REG104 series is a family of LDO (Low DropOut) linear regulators. The family includes five fixed output versions (2.5V to 5.0V) and an adjustable output version. An internal DMOS power device provides low dropout regulation with near constant ground pin current (largely independent of load and dropout conditions) and very fast line and load transient response. All versions include internal current limit and thermal shutdown circuitry.
PAGE 9
The Enable Pin Current versus Applied Voltage relationship is shown in Figure 4. When the Enable pin is connected to VIN greater than 10V, a series resistor may be used to limit the current. VN = 35 µVRMS • VOUT V Connecting a capacitor, CNR, from the Noise-Reduction (NR) pin to ground can reduce the output noise voltage. Adding CNR, as shown in Figure 5, forms a low-pass filter for the voltage reference.
PAGE 10
connected from the output to the adjust pin will reduce both the output noise and the peak error from a load transient. Figure 7 shows improved output noise performance for two capacitor combinations. nV/√Hz 10.0 In the transient dropout region between DC and Transient, transient response recovery time increases. The time required to recover from a load transient is a function of both the magnitude and rate of the step change in load current and the available headroom VIN to VOUT voltage drop.
PAGE 11
POWER DISSIPATION Power dissipation depends on input voltage and load conditions. Power dissipation is equal to the product of the average output current times the voltage across the output element, VIN to VOUT voltage drop. PD = (VIN – VOUT ) • IOUT ( AVG) Power dissipation can be minimized by using the lowest possible input voltage necessary to assure the required output voltage. REG104 SBVS025G 5 Power Dissipation (Watts) The REG104 is available in two different package configurations.
PAGE 12
REGULATOR MOUNTING The tab of both packages is electrically connected to ground. For best thermal performance, the tab of the DDPAK surface-mount version should be soldered directly to a circuitboard copper area. Increasing the copper area improves heat dissipation. Figure 10 shows typical thermal resistance from junction to ambient as a function of the copper area for the DDPAK. Figure 11 shows the same relationship for the SOT-223.
PAGE 13
PACKAGE OPTION ADDENDUM www.ti.com 31-Oct-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) TBD Call TI Call TI Op Temp (°C) Device Marking (4/5) REG104FA-2.5 OBSOLETE DDPAK/ TO-263 KTT 5 REG104FA-2.5/500 ACTIVE DDPAK/ TO-263 KTT 5 500 Green (RoHS & no Sb/Br) CU SN Level-2-260C-1 YEAR REG 104FA-2.5 REG104FA-2.
PAGE 14
PACKAGE OPTION ADDENDUM www.ti.
PAGE 15
PACKAGE OPTION ADDENDUM www.ti.
PAGE 16
PACKAGE OPTION ADDENDUM www.ti.com 31-Oct-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 28-Sep-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant REG104FA-2.5/500 DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.6 15.6 4.9 16.0 24.0 Q2 REG104FA-2.5KTTT DDPAK/ TO-263 KTT 5 50 330.0 24.4 10.6 15.6 4.9 16.0 24.0 Q2 REG104FA-3.3/500 DDPAK/ TO-263 KTT 5 500 330.0 24.4 10.6 15.6 4.
PAGE 18
PACKAGE MATERIALS INFORMATION www.ti.com 28-Sep-2013 Device REG104GA-A/2K5 Package Package Pins Type Drawing SPQ SOT-223 2500 DCQ 6 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 12.4 6.8 B0 (mm) K0 (mm) P1 (mm) 7.3 1.88 8.0 W Pin1 (mm) Quadrant 12.0 Q3 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) REG104FA-2.5/500 DDPAK/TO-263 KTT 5 500 367.0 367.0 45.0 REG104FA-2.5KTTT DDPAK/TO-263 KTT 5 50 367.
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