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Low Voltage Integrated Regulator Circuit

IP.com Disclosure Number: IPCOM000034351D
Original Publication Date: 1989-Feb-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

Cvijanovic, MC: AUTHOR [+2]

Abstract

This Low Voltage Integrated Regulator Circuit (LVIRC) is based on Widler's bandgap reference circuit and an improved error amplifier design. In Fig. 1 the output of the regulator circuit is 1.7 V and the input is 5 +/- 10% and includes a reference circuit shown in Fig. 2. The load regulation of the circuit is 0.12% over 1.8 amperes and the temperature variation is 0.53% over 85oC. The overall statistical average worst-case regulation is +- 7.6%. This regulator circuit is designed for use on a master slice as an on-chip voltage regulator to supply the +1.7 V necessary for an internal cell array and can be used in any other application where low voltage and high load currents are required. (Image Omitted) In Fig.

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Low Voltage Integrated Regulator Circuit

This Low Voltage Integrated Regulator Circuit (LVIRC) is based on Widler's bandgap reference circuit and an improved error amplifier design. In Fig. 1 the output of the regulator circuit is 1.7 V and the input is 5 +/- 10% and includes a reference circuit shown in Fig. 2. The load regulation of the circuit is 0.12% over
1.8 amperes and the temperature variation is 0.53% over 85oC. The overall statistical average worst-case regulation is +- 7.6%. This regulator circuit is designed for use on a master slice as an on-chip voltage regulator to supply the +1.7 V necessary for an internal cell array and can be used in any other application where low voltage and high load currents are required.

(Image Omitted)

In Fig. 1, transistors T7 and T8 form a differential pair; T9 and T10 form a lateral PNP current divider with equal amounts of currents through T7 and T8 transistors and T13, T14 form a stable current source. Resistor R5 controls the approximately equal stable current through T13 and T14 devices. Equal amounts of current through T7 and T8 will cause equal Vbe voltage drops in T7 and T8 devices and thus the Vf voltage will match closely to the Vref voltage. T11 is a series pass transistor which is used as a current multiplier and a driver to a high current device. T12 is a high current Darlington pair. This device has very high Beta (B) and can handle up to 8 amperes (the Darlington is located off chip on a card). Resistors R6 and R7 form a feedback network, and the values are chosen to maintain Vf at 1.4 V and Vregout at 1.7 V. The features of the circuit in Fig. 1 compared to a regular differential amplifier are the gain of the amplifier is extremely high due to the PNP device (T10) instead...