Datasheet

Output
Voltage
Output
Current
Output
Voltage
Output
Current
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Table 2. Sample Resistor Values for Common Output Voltages
for TPS74001DPT EVM
R
1
[kΩ] R
2
[kΩ] VOUT [V]
Short Open 0.9
0.562 5.11 1.0
0.75 4.53 1.05
1.07 4.99 1.1
1.58 4.75 1.2
1.91 2.87 1.5
2.43 2.43 1.8
3.01 1.69 2.5
4.22 1.58 3.3
5.23 1.74 3.6
TPS74012DPTEVM is a fixed output voltage IC and cannot be modified. The output voltage is fixed at
1.2V.
4.2 Transient Response
The TPS740xx is designed to have excellent transient response for most applications with a small amount
of output capacitance. The TPS740xx is stable with a ceramic output capacitor as low as 2.2µF. Additional
output capacitance will serve to reduce undershoot and overshoot at the output during a transient event.
Below is an example load transient response captured with V
IN
= 3.5V, V
BIAS
= 5.0V, Load = 1.2A.
Figure 3. Transient Response of TPS74001DPTEVM-713
with V
IN
= 3.5V, V
BIAS
= 5.0V, Load = 1.2A
4.3 Dropout Voltage, V
DO
TPS740xxDPT offers very low dropout performance and allows the device to be used in place of a DC/DC
converter and still achieve good efficiency. The V
IN
dropout voltage, V
IN
-V
OUT
, for the TPS740xxDPT is
specified to be a maximum of 300mV at 1.5A load for V
BIAS
= V
OUT
+ 2.0V. The V
IN
dropout voltage
decreases as V
BIAS
increases.
5
SLVU476– June 2011 TPS740xxDPTEVM-713 Evaluation Module
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