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Burr-Brown Corporation - DMOS 500mA Low Dropout Regulator

Numéro de référence REG103GA
Description DMOS 500mA Low Dropout Regulator
Fabricant Burr-Brown Corporation 
Logo Burr-Brown Corporation 





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REG103GA fiche technique
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REG103
REG103
REG103
REG103
DMOS
500mA Low Dropout Regulator
FEATURES
q NEW DMOS TOPOLOGY:
Ultra Low Dropout Voltage:
115mV typ at 500mA and 3.3V Output
Output capacitor NOT required for stability
q FAST TRANSIENT RESPONSE
q VERY LOW NOISE: 33µVrms
q HIGH ACCURACY: ±2% max
q HIGH EFFICIENCY:
IGND = 1mA at IOUT = 500mA
Not Enabled: IGND = 0.5µA
q 2.5V, 2.7V, 3.0V, 3.3V, 5.0V AND
ADJUSTABLE OUTPUT VERSIONS
q FOLDBACK CURRENT LIMIT
q THERMAL PROTECTION
q OUTPUT VOLTAGE ERROR INDICATOR(1)
q SMALL SURFACE-MOUNT PACKAGES:
SOT223-5, DDPAK-5, SO-8
APPLICATIONS
q PORTABLE COMMUNICATION DEVICES
q BATTERY-POWERED EQUIPMENT
q PERSONAL DIGITAL ASSISTANTS
q MODEMS
q BAR-CODE SCANNERS
q BACKUP POWER SUPPLIES
DESCRIPTION
The REG103 is a family of low noise, low dropout
linear regulators with low ground pin current. Its new
DMOS topology provides significant improvement
over previous designs, including low dropout voltage
(only 115mV typ at full load), and better transient
performance. In addition, no output capacitor is re-
quired 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 1mA (at IOUT =
500mA) and drops to 0.5µA in “not enabled” mode.
Unlike regulators with PNP pass devices, quiescent
current remains relatively constant over load varia-
tions and under dropout conditions.
The REG103 has very low output noise (typically
33µVrms 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 maintained over tem-
perature, line, and load variations. Key parameters are
guaranteed over the specified temperature range
(–40°C to +85°C).
The SO-8 version of the REG103 has an Error pin
which provides a “power good” flag indicating the
regulator is in regulation. The REG103 is well pro-
tected: internal circuitry provides a current limit which
protects the load from damage. Thermal protection
circuitry keeps the chip from being damaged by exces-
sive temperature. In addition to the SO-8 package, the
REG103 is also available in the DDPAK and the
SOT223-5.
Enable Error(1)
Enable Error(1)
VIN
+
0.1µF
REG103
(Fixed Voltage
Versions)
NR Gnd
NR = Noise Reduction
VOUT
+ COUT(2)
VIN
+
0.1µF
NOTE: (1) SO-8 Package Only. (2) Optional.
REG103-A
Gnd
R1 +
Adj
VOUT
COUT(2)
R2
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©2000 Burr-Brown Corporation
PDS-11527C
REPriGnte1d i0n U3.S.A. July, 2000
®

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