TPS7A6933QDRQ1 Datasheet, PDF (14/26 Pages) Texas Instruments – High-Voltage Ultralow-Iq Low-Dropout Regulator

TPS7A6601-Q1, TPS7A6633-Q1
TPS7A6650-Q1, TPS7A6933-Q1
TPS7A6950-Q1
SLVSBL0B – DECEMBER 2012 – REVISED AUGUST 2013
APPLICATION INFORMATION
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Figure 22 and Figure 23 show typical application circuits for the TPS7A66xx and TPS7A69xx, respectively. One
may use different values of external components, depending on the end application. An application may require a
larger output capacitor may uring fast load steps in order to prevent reset from occurring. TI recommends a low-
ESR ceramic capacitor with dielectric of type X5R or X7R.
Vbat
TPS7A66xx-Q1
1 Vin
1 F
Vout 8
2.2 F
Vreg
Vbat
TPS7A69xx-Q1
1 Vin
1 F
Vout 8
SO 7
2.2 F
10 k 
Vreg
1 nF
2 EN
4 CT
PG 6
GND 5
10 k 
2 SI
2.2 F
1 nF
4 CT
PG 6
GND 5
10 k 
Figure 22. Typical Application Schematic for
TPS7A66xx
Figure 23. Typical Application Schematic for
TPS7A69xx
Power Dissipation and Thermal Considerations
Calculate power dissipated in the device using Equation 3.
space
P_D = I_out × (V_in – V_out) + I_quiescent × V_in
(3)
Where:
P_D = continuous power dissipation
I_out = output current
V_in = input voltage
V_out = output voltage
As I_quiescent << I_out, therefore ignore the term I_quiescent × V_in in Equation 3.
For a device under operation at a given ambient air temperature (T_A), calculate the junction temperature (T_J)
using Equation 4.
space
T_J = T_A + (θ_JA × P_D)
(4)
where:
θ_JA = junction-to-ambient air thermal impedance
space
ΔT = T_J – T_A = (θ_JA × P_D)
(5)
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