The transient response of a LDO islimited by the size of the power transistor, the biasing current and the loop bandwidth. High quiescent current is very helpful to widen the small-signal bandwidth and increase the large-signal slew rate. However, this is not preferred in modern energy-sensitive battery-powered portable devices.
Current efficiency, which refers to the ratio of load to input current, determines operational life in the world of portable electronics [18, 19]. The ultralow-power OCL-LDO in portable devices can prolong the battery life at the sacrifice of transient performance .
When an undershoot or overshoot voltage occurs in the load transient response, the undershoot voltage and settling time are reduced by increasing the gate discharging current or gate charging current of the pass transistor by the current flowing through the feedback capacitor.
The figure of merit is introduced to compare the transient response of different LDOs, in which , , and represent the settling time, the quiescent current, and the maximum load current step, respectively. A smaller FOM means a superior transient performance of the LDO .
A smaller FOM means a superior transient performance of the LDO . From Table 2, it can be seen that the proposed LDO achieves a fast transient response and a low quiescent current. 4. Conclusions In this paper, a fast-transient low-power OCL-LDO has been presented.
This paper presents a low quiescent current OCL-LDO with fast transient response. A transient enhancement unit (TEU) is proposed as the output voltage-spike detection circuit. It enhances the transient response by improving the slew-rate at the gate of the power transistor.
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A single stage high-gain telescopic cascode-compensated amplifier is used to attain good static performances, while thanks to a very simple dynamic bias circuit, transient performances are significantly enhanced with no quiescent current penalty. Results validate a 1.8 V output voltage from a 3.6 V to 1.9 V battery input voltage, delivering a ...
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Regulation, and Operating Temperature Range ±2% Output
Features • Qualified for Automotive Applications – AEC-Q100 Grade 1, TA: −40°C to +125°C – Junction Temperature, TJ: −40°C to +150°C • Input Voltage: 4.5 V to 42 V, with 45-V Transient • Output Voltage: 2 Output Channels, Adjustable from 1.5 V to 20 V • ±2% Output Accuracy over Line Regulation, Load Regulation, and Operating Temperature Range
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voltage-spike detection circuit to reduce undershoot voltage and settling time without consuming additional quiescent current. When an undershoot or overshoot voltage occurs in the load transient response, the undershoot voltage and settling time are reduced by increasing the gate discharging current or gate charging current of the pass transistor by the current flowing …
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