DocumentCode :
3135898
Title :
Limiting internal supply voltage spikes in DC-DC converters
Author :
Rocha, José ; Santos, Marcelino ; Santos, Gabriel ; Monteiro, Ângelo ; Neves, Alexandre ; Braga, Pedro
Author_Institution :
Inst. Super. de Eng. de Lisboa / IPL, Lisbon, Portugal
fYear :
2009
fDate :
5-8 July 2009
Firstpage :
1060
Lastpage :
1065
Abstract :
Implementing monolithic DC-DC converters for low power portable applications with a standard low voltage CMOS technology leads to lower production costs and higher reliability. Moreover, it allows miniaturization by the integration of two units in the same die: the power management unit that regulates the supply voltage for the second unit, a dedicated signal processor, that performs the functions required. This paper presents original techniques that limit spikes in the internal supply voltage on a monolithic DC-DC converter, extending the use of the same technology for both units. These spikes are mainly caused by fast current variations in the path connecting the external power supply to the internal pads of the converter power block. This path includes two parasitic inductances inbuilt in bond wires and in package pins. Although these parasitic inductances present relative low values when compared with the typical external inductances of DC-DC converters, their effects can not be neglected when switching high currents at high switching frequency. The associated overvoltage frequently causes destruction, reliability problems and/or control malfunction. Different spike reduction techniques are presented and compared. The proposed techniques were used in the design of the gate driver of a DC-DC converter included in a power management unit implemented in a standard 0.35 mum CMOS technology.
Keywords :
CMOS integrated circuits; DC-DC power convertors; inductance; monolithic integrated circuits; overvoltage; bond wire; converter power block; dedicated signal processor; external inductance; external power supply; fast current variation; gate driver; internal pad; internal supply voltage spike; low power portable application; low production cost; low voltage CMOS technology; monolithic DC-DC converter; overvoltage; package pin; parasitic inductance; power management unit; reliability; spike reduction technique; supply voltage regulation; switching frequency; Bonding; CMOS technology; Costs; DC-DC power converters; Energy management; Joining processes; Low voltage; Power supplies; Production; Signal processing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics, 2009. ISIE 2009. IEEE International Symposium on
Conference_Location :
Seoul
Print_ISBN :
978-1-4244-4347-5
Electronic_ISBN :
978-1-4244-4349-9
Type :
conf
DOI :
10.1109/ISIE.2009.5222413
Filename :
5222413
Link To Document :
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