Datasheet

O
ref
V
R1 ( 1) R2
V
= - ´
O ref
R1
V V (1 )
R2
= ´ +
TPS76901-Q1, TPS76912-Q1, TPS76915-Q1
TPS76918-Q1, TPS76925-Q1, TPS76927-Q1
TPS76928-Q1, TPS76930-Q1, TPS76933-Q1, TPS76950-Q1
SGLS118C –DECEMBER 2001–REVISED JUNE 2012 www.ti.com
electrolytic, aluminum electrolytic, and multilayer ceramic capacitors are all suitable, provided they meet the
requirements described above. Most of the commercially available 4.7 µF surface-mount solid tantalum
capacitors, including devices from Sprague, Kemet, and Nichico, meet the ESR requirements stated above.
Multilayer ceramic capacitors may have very small equivalent series resistances and may therefore require the
addition of a low value series resistor to ensure stability.
Table 1. Capacitor Selection
PART NO. MFR. VALUE MAX ESR SIZE (H × L × W)
(1)
T494B475K016AS KEMET 4.7 µF 1.5 Ω 1.9 × 3.5 × 2.8
195D106x0016x2T SPRAGUE 10 µF 1.5 Ω 1.3 × 7 × 2.7
695D106x003562T SPRAGUE 10 µF 1.3 Ω 2.5 × 7.6 × 2.5
TPSC475K035R0600 AVX 4.7 µF 0.6 Ω 2.6 × 6 × 3.2
(1) Size is in mm. ESR is maximum resistance in Ω at 100 kHz and T
A
= 25°C. Contact manufacturer for minimum ESR values.
Output Voltage Programming
The output voltage of the TPS76901-Q1 adjustable regulator is programmed using an external resistor divider as
shown in Figure 22. The output voltage is calculated using:
(1)
Where:
V
ref
= 1.224 V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 7-µA divider current. Lower value resistors can be
used but offer no inherent advantage and waste more power. Higher values should be avoided as leakage
currents at FB increase the output voltage error. The recommended design procedure is to choose R2 = 169 kΩ
to set the divider current at 7 µA and then calculate R1 using:
(2)
Table 2. Output Voltage Programming Guide
DIVIDER RESISTANCE (kΩ)
(1)
OUTPUT VOLTAGE (V)
R1 R2
2.5 174 169
3.3 287 169
3.6 324 169
4 383 169
5 523 169
(1) 1% values shown.
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Product Folder Link(s): TPS76901-Q1 TPS76912-Q1 TPS76915-Q1 TPS76918-Q1 TPS76925-Q1 TPS76927-Q1
TPS76928-Q1 TPS76930-Q1 TPS76933-Q1 TPS76950-Q1