Datasheet

LDO
SW Supply
(DC-DC)
CPU/MCU/SOC
VIN
VOUT1
R1/C1
ON/OFF
Q1
Q2
R1
C1
CVDDIO
(2, 3)
R2
(1)
(5)
(6)
(4)
CIN
VDDIO VDD
CVDD
DVDD
VIN
VOUT
R1/C1
ON/OFF
Q1
Q2
R1
CIN
(2, 3)
R2
(1)
(5)
(6)
(4)
1.8 - 8V
Input
Boost Reg
CIN
VIN
SW
FB
GPIO
SHDN
TPS27082L
www.ti.com SLVSBR5B –DECEMBER 2012–REVISED SEPTEMBER 2013
Boost Regulator with True Shutdown
Figure 4. True Shutdown Using TPS27082L
The most common boost regulator topology provides a current leakage path through inductor and diode into the
feedback resistor even when the regulator is shut down. Adding a TPS27082L in the input side power path
prevents this leakage current and thus providing a true shutdown.
Single Module Multiple Power Supply Sequencing
Figure 5. Power Sequencing Using TPS27082L, Example 1
Most modern SOCs and CPUs require multiple voltage inputs for its Analog, Digital cores and IO interfaces.
These ICs require that these supplies be applied simultaneously or in a certain sequence. TPS27082L when
configured, as shown in Figure 5, with the VOUT1 rise time adjusted appropriately through resistor R2 and
capacitor C1, will delay the early arriving LDO output to match up with late arriving DC-DC output and thus
achieving power sequencing.
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