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TPS721 Datasheet(PDF) 8 Page - Texas Instruments

Part # TPS721
Description  LOW INPUT VOLTAGE, CAP FREE 150-mA LOW-DROPOUT LINEAR REGULATORS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS721 Datasheet(HTML) 8 Page - Texas Instruments

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TPS72115
1.8 V
1.5 V
Boost Converter
3.3 V
1.8 V – 3 V
VIO
VCORE
DSP or
Controller
Two AAA
Batteries
EXTERNAL CAPACITOR REQUIREMENTS
POWER DISSIPATION AND JUNCTION TEMPERATURE
P
D(max) +
T
J
max * TA
R
q
JA
(1)
P
D +
V
I *
V
O
I
O
(2)
PROGRAMMING THE TPS72101 ADJUSTABLE LDO REGULATOR
V
O +
V
ref
1 )
R1
R2
(3)
TPS72101
,, TPS72115
TPS72116, TPS72118
SLVS352C – DECEMBER 2001 – REVISED MARCH 2006
APPLICATION INFORMATION (continued)
Figure 19. Dual Supply Application Circuit
A 0.1-µF ceramic bypass capacitor is required on both the input and output for stability. Larger capacitors
improve transient response, noise rejection, and ripple rejection. A higher value electrolytic input capacitor may
be necessary if large, fast rise time load transient are anticipated, and/or there is significant input resistance from
the device to the input power supply.
Specified regulator operation is assured to a junction temperature of 125°C; the maximum junction temperature
allowable without damaging the device is 150°C. This restriction limits the power dissipation the regulator can
handle in any given application. To ensure the junction temperature is within acceptable limits, calculate the
maximum allowable dissipation, PD(max), and the actual dissipation, PD, which must be less than or equal to
PD(max).
The maximum-power-dissipation limit is determined using Equation 1 :
Where:
• T
Jmax is the maximum allowable junction temperature.
• Rθ
JA is the thermal resistance junction-to-ambient for the package; see the package dissipation rating table.
• T
A is the ambient temperature.
The regulator dissipation is calculated using Equation 2:
Power dissipation resulting from quiescent current is negligible.
The output voltage of the TPS72101 adjustable regulator is programmed using an external resistor divider as
shown in Figure 20. The output voltage is calculated using Equation 3:
Where:
• V
ref = 1.225 V typ (the internal reference voltage)
8
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