An On-Chip LDO with Low Voltage Fast Transient Response
A transient response and fast technology, which is applied in the direction of instruments, control/regulation systems, and regulation of electrical variables, etc., can solve problems such as poor transient response performance, and achieve the effect of self-starting
Inactive Publication Date: 2018-09-21
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology
[0010] Aiming at the disadvantages of poor transient response performance of the existing on-chip LDO and difficulty in application under low power supply voltage, the present invention provides an on-chip LDO with low-voltage fast transient response, by introducing an inverter-based rail-to-rail into the error amplifier Rail input operational amplifier achieves the purpose of low input voltage, the introduction of STCB structure and high-pass coupling structure realizes the fast transient response of the on-chip LDO, and does not need an external bias network, the LDO can achieve self-start
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[0047] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0048] Such as figure 2 Shown is the operational amplifier circuit diagram based on the rail-to-rail input of the inverter in the error amplifier in the present invention, when V in1 When it is a reference voltage, the bias point control unit Trip Point Controller can automatically establish a bias state through a feedback loop adjustment. In a stable bias state, the upper and lower tube currents of each level shifter level shifter are equal, and each The PMOS current and the NMOS current of the stage inverter are also equal, as shown in formula (2).
[0049]
[0050] V OCM =V gs14 =V DD -V gs13 (3)
[0051] Among them, μ n is the electron mobility, μ p is the hole mobility, C OX is the gate oxide capacitance per unit area, (W / L) 13 and (W / L) 14They are the seventh PMOS transistor M 13 and the sevent...
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An on-chip LDO with low-voltage fast transient response belongs to the technical field of power management. The gate of the power tube is connected to the output end of the output stage, and its drain is grounded after passing through the series structure of the first feedback resistor and the second feedback resistor; the non-inverting input end of the error amplifier is connected to the series connection point of the first feedback resistor and the second feedback resistor , its inverting input terminal is connected to the reference voltage, its first output terminal is connected to the first input terminal of the output stage, and its second output terminal is connected to the second input terminal of the output stage; the Miller capacitor and the zero-adjusting resistor are connected in series , the other end of the zeroing resistor is connected to the gate of the power tube, the other end of the Miller capacitor is connected to the drain of the power tube; the load capacitor is connected between the drain of the power tube and ground; the error amplifier is introduced into the inverter-based The rail-to-rail input operational amplifier realizes the purpose of low input voltage, the introduction of the STCB structure and the high-pass coupling structure realizes the fast transient response of the on-chip LDO, and the invention does not need an external bias network and can realize self-starting.
Description
technical field [0001] The invention belongs to the technical field of power supply management, and in particular relates to an on-chip low-dropout linear regulator LDO with low-voltage fast transient response. Background technique [0002] With the rapid development of mobile phones, handheld computers and other electronic products and integrated circuit systems, power management chips are playing an increasingly important role in the field of integrated circuits. As a member of the DC power management chip, the Low Dropout Regulator (LDO) has the characteristics of low cost, low noise, high precision and simple peripheral circuit, and is widely used in various electronic products. On-chip LDOs are easier to integrate than traditional LDOs with large capacitors on the output. However, due to its small output capacitance, the undershoot of the output voltage will be significantly increased when the load is switched compared with the traditional LDO with large load capacitan...
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IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 明鑫张文林张家豪王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA