REG104_08 Datasheet, PDF (1/21 Pages) Burr-Brown (TI) – DMOS 1A Low-Dropout Regulator

REG104
REG104
REG104
SBVS025G – SEPTEMBER 2001 – REVISED SEPTEMBER 2005
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: 33µV_RMS
q HIGH ACCURACY: ±2% max
q HIGH EFFICIENCY:
I_GND = 1.7mA at I_OUT = 1A
Not Enabled: I_GND = 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 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_NR = 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.
Enable
V_IN
+
0.1µF
REG104
(Fixed Voltage
Versions)
NR
Gnd
NR = Noise Reduction
V_OUT
+ _COUT(1)
V_IN
+
0.1µF
NOTE: (1) Optional.
Enable
REG104-A
Gnd
R_{1 +}
Adj
V_OUT
C_OUT(1)
R₂
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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.
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