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TPS7A3301 Datasheet(PDF) 11 Page - Texas Instruments

Part # TPS7A3301
Description  ??6-V, ??-A, Ultralow-Noise Negative Voltage Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS7A3301 Datasheet(HTML) 11 Page - Texas Instruments

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Where:
V
OUT
R + R
1
2
³ 5
A, and
m
V
OUT
V
REF
- 1
R = R
1
2
TPS7A3301
OUT
FB
GND
C
10 F
IN
m
C
1 F
NR/SS
m
R
1
1.24 M
W
R
2
105 k
W
C
10 nF
FF
C
47 F
OUT
m
IN
EN
NR/SS
V
IN
V
OUT =
15 V
-
V
OUT
V
REF
- 1
R = R
1
2
V
OUT
R + R
1
2
³ 5
A
m
, where
TPS7A33
www.ti.com
SBVS169B – DECEMBER 2011 – REVISED MARCH 2012
THEORY OF OPERATION
GENERAL DESCRIPTION
The TPS7A33 belongs to a family of new-generation linear regulators that use an innovative bipolar process to
achieve ultralow-noise and very high PSRR levels at a wide input voltage and current range. These features,
combined with the external heatsink-capable, high thermal performance TO-220 package, make this device ideal
for high-performance analog applications.
ADJUSTABLE OPERATION
The TPS7A3301 has an output voltage range of –1.182 V to –33 V. The nominal output voltage of the device is
set by two external resistors, as shown in Figure 28.
Figure 28. Adjustable Operation for Maximum AC Performance
R1 and R2 can be calculated for any output voltage range using Equation 1. To ensure stability under no load
conditions at VOUT > VREF, this resistive network must provide a current equal to or greater than 5 μA.
(1)
If greater voltage accuracy is required, take into account the output voltage offset contributions because of the
feedback pin current and use 0.1% tolerance resistors.
Table 1 shows the resistor combination to achieve a few of the most common rails using commercially-available,
0.1%-tolerance resistors to maximize nominal voltage accuracy while abiding to the formula shown in Equation 1:
Table 1. Suggested Resistors for Common Voltage Rails
VOUT
R1
R2
VOUT/(R1+R2)
NOMINAL ACCURACY
–1.171 V
0
Ω
0
μA
±1.5%
–1.8 V
76.8 k
Ω
143 k
Ω
8.18
μA
±(1.5% + 0.08%)
–3.3 V
200 k
Ω
110 k
Ω
10.64
μA
±(1.5% + 0.13%)
–5 V
332 k
Ω
102 k
Ω
11.48
μA
±(1.5% + 0.50%)
–10 V
1.62 M
Ω
215 k
Ω
5.44
μA
±(1.5% + 0.23%)
–12 V
1.5 M
Ω
162 k
Ω
7.22
μA
±(1.5% + 0.29%)
–15 V
1.24 M
Ω
105 k
Ω
11.15
μA
±(1.5% + 0.18%)
–18 V
3.09 M
Ω
215 k
Ω
5.44
μA
±(1.5% + 0.19%)
–24 V
1.15 M
Ω
59 k
Ω
19.84
μA
±(1.5% + 0.21%)
Copyright © 2011–2012, Texas Instruments Incorporated
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