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REG103-27 Datasheet(PDF) 10 Page - Texas Instruments

Part # REG103-27
Description  DMOS 500mA Low-Dropout Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

REG103-27 Datasheet(HTML) 10 Page - Texas Instruments

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REG103
10
SBVS010D
Since the value of VREF is 1.295V, this relationship reduces to:
V
Vrms
V
V
N
OUT
=
µ
35
Connecting a capacitor, CNR, from the Noise-Reduction
(NR) pin to ground, can reduce the output noise voltage.
Adding CNR, as shown in Figure 7, forms a low-pass filter
for the voltage reference. For CNR = 10nF, the total noise in
the 10Hz to 100kHz bandwidth is reduced by approximately
a factor of 3.5, as shown in Figure 8.
FIGURE 7. Block Diagram.
Over Current
Over Temp
Protection
V
REF
(1.295V)
Low Noise
Charge Pump
DMOS
Output
R
1
NOTE: R
1 and R2 are internal
on fixed output versions.
V
OUT
Adj
(Adjustable
Versions)
R
2
NR
(fixed output
versions only)
ENABLE
REG103
V
IN
ERROR
C
NR
(optional)
FIGURE 8. Output Noise versus Noise-Reduction Capacitor.
0.001
0.01
0.1
1
45
35
25
C
NR (µF)
C
OUT = 0
C
OUT = 10µF
FIGURE 9. Output Noise Density on Adjustable Versions.
100
10
1000
10000
100000
10.0
1.0
0.1
Frequency
C
OUT = 0, CFB = 0
C
OUT = 0, CFB = 0.01µF
C
OUT = 10µF, CFB = 0.01µF
The REG103 adjustable version does not have the noise-
reduction pin available, however, the adjust pin is the sum-
ming junction of the error amplifier. A capacitor, CFB,
connected from the output to the adjust pin will reduce both
the output noise and the peak error from a load transient.
Figure 9 shows improved output noise performance for two
capacitor combinations.
The REG103 utilizes an internal charge pump to develop an
internal supply voltage sufficient to drive the gate of the
DMOS pass element above VIN. The charge-pump switch-
ing noise (nominal switching frequency = 2MHz) is not
measurable at the output of the regulator.
DROP-OUT VOLTAGE
The REG103 uses an N-channel DMOS as the “pass”
element. When the input voltage is within a few hundred
millivolts of the output voltage, the DMOS device behaves
like a resistor. Therefore, for low values of VIN to VOUT, the
regulator’s input-to-output resistance is the RdsON of the
DMOS pass element (typically 230m
Ω). For static (DC)
loads, the REG103 will typically maintain regulation down
to VIN to VOUT voltage drop of 115mV at full-rated output
current. In Figure 10, the bottom line (DC dropout) shows
the minimum VIN to VOUT voltage drop required to prevent
drop-out under DC load conditions.


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