Charge Pumps

Charge pumps are DC to DC converters that are often needed in designs requiring more than one dc supply voltage. It’s made up of switches and capacitors. The switches are usually diodes in discrete designs but are also MOSFETs in IC versions. The capacitors are electrolytic or ceramics depending on the switching speed. There’s no need for an inductor. Charge pumps can double, triple, halve voltages but they can also invert or scale voltages. They are commonly used in low-power electronic devices to suit a voltage for different parts of the circuit.
Charge Pumps have a few advantages over the majority of other types of DC-DC converters and they are:
• Simplicity in build
• Lower cost of production
• Fewer components
• No inductor
• Higher efficiency than linear

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Description Price Converter Type Maximum Output Current Maximum Switching Frequency Mounting Type Package Type Pin Count Typical Operating Supply Voltage Dimensions Height Length Maximum Operating Supply Voltage Maximum Operating Temperature Maximum Output Voltage Minimum Operating Supply Voltage
RS Stock No. 165-9179
Mfr. Part No.MAX868EUB+
HK$19.85
Each (In a Tube of 50)
units
Inverting 35mA 450 kHz Surface Mount μMAX 10 1.8 → 5.5 V 3.15 x 3.15 x 0.94mm 0.94mm 3.15mm 5.5 V +85 °C -3.6 V 1.8 V
RS Stock No. 146-0207
Mfr. Part No.TC7660SEOA
BrandMicrochip
HK$5.041
Each (In a Tube of 100)
units
Inverting 20mA 45 kHz Surface Mount SOIC 8 - 5 x 3.99 x 1.5mm 1.5mm 5mm 12 V +85 °C -12 V 1.5 V
RS Stock No. 146-1028
Mfr. Part No.MAX865EUA+
HK$18.48
Each (In a Tube of 50)
units
Inverting, Step Up - - Surface Mount μMAX 8 - 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 6 V +85 °C ±12 V 1.5 V
RS Stock No. 872-2461
Mfr. Part No.TC7660COA
BrandMicrochip
HK$5.20
Each (In a Tube of 100)
units
- - - Surface Mount SOIC 8 - 4.9 x 3.91 x 1.42mm 1.42mm 4.9mm - +70 °C 10 V -
New
RS Stock No. 190-0321
Mfr. Part No.MAX868EUB+
HK$32.614
Each (In a Pack of 5)
units
Inverting 35mA 450 kHz Surface Mount μMAX 10 1.8 → 5.5 V 3.15 x 3.15 x 0.94mm 0.94mm 3.15mm 5.5 V +85 °C -3.6 V 1.8 V
RS Stock No. 145-6358
Mfr. Part No.LTC1044CN8#PBF
HK$22.66
Each (In a Tube of 50)
units
Inverting, Step Down, Step Up - - Through Hole PDIP 8 - 10.16 x 6.48 x 3.3mm 3.3mm 10.16mm - +85 °C -1.5 V, 4.5 V -
RS Stock No. 207-0281
Mfr. Part No.TC7660COA
BrandMicrochip
HK$6.85
Each
units
- - - Surface Mount SOIC 8 - 4.9 x 3.91 x 1.42mm 1.42mm 4.9mm - +70 °C 10 V -
RS Stock No. 732-7658
Mfr. Part No.ICL7662EPA+
HK$37.85
Each
units
Inverting 20mA 10 kHz Through Hole PDIP 8 4.5 to 20 V 10.033 x 6.35 x 3.302mm 3.302mm 10.03mm 20 V +85 °C -4.5 V 4.5 V
RS Stock No. 177-7264
Mfr. Part No.LTC1044ACS8#PBF
HK$56.571
Each (In a Tube of 100)
units
Inverting, Step Up 20µA - Surface Mount SOIC 8 - 5.004 x 3.988 x 1.752mm 1.752mm 5mm 12 V +70 °C - 1.5 V
RS Stock No. 162-6768
Mfr. Part No.TPS60150DRVT
HK$8.195
Each (On a Reel of 250)
units
Charge Pump 140mA 1.5 MHz Surface Mount SON 6 - 2.1 x 2.1 x 0.75mm 0.75mm 2.1mm 5.5 V +85 °C 5.2 V 2.7 V
RS Stock No. 178-4969
Mfr. Part No.TC1044SCPA
BrandMicrochip
HK$6.76
Each (In a Tube of 60)
units
Charge Pump 20mA 45 kHz Through Hole PDIP 8 - 10.16 x 6.6 x 4.06mm 4.06mm 10.16mm 12 V +70 °C -12 V 3 V
RS Stock No. 403-715
Mfr. Part No.MCP1252-33X50I/MS
BrandMicrochip
HK$11.86
Each (In a Pack of 5)
units
Step Down, Step Up 150mA 650 kHz Surface Mount MSOP 8 - 3 x 3 x 0.85mm 0.85mm 3mm 5.5 V +85 °C - 2.1 V
New
RS Stock No. 190-0503
Mfr. Part No.MAX619ESA+
HK$57.815
Each (In a Pack of 2)
units
Step Up 120mA 500 kHz Surface Mount SOIC 8 2 → 3.6 V 5 x 4 x 1.5mm 1.5mm 5mm 3.6 V +85 °C 5.2 V 2 V
RS Stock No. 146-1040
Mfr. Part No.ICL7662EPA+
HK$42.75
Each (In a Tube of 50)
units
Inverting 20mA 10 kHz Through Hole PDIP 8 4.5 → 20 V 10.033 x 6.35 x 3.302mm 3.302mm 10.03mm 20 V +85 °C -4.5 V 4.5 V
RS Stock No. 798-7894
Mfr. Part No.MAX861ESA+
HK$43.91
Each
units
Inverting 50mA 250 kHz Surface Mount SOIC 8 5 V 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V +85 °C -4 V 2.5 V
New
RS Stock No. 189-7016
Mfr. Part No.MAX870EUK+T
HK$22.356
Each (On a Reel of 2500)
units
Inverting 50mA 125 kHz Surface Mount SOT-23 5 1 V 3 x 3 x 1.3mm 1.3mm 3mm 5.5 V +85 °C -1.4 V 1.4 V
RS Stock No. 412-585
Mfr. Part No.ADM660ARZ
HK$38.486
Each (In a Pack of 5)
units
Inverting, Step Up - - Surface Mount SOIC 8 - 5 x 4 x 1.5mm 1.5mm 5mm 7 V +85 °C 1.7 V, 14 V 1.5 V
RS Stock No. 178-9156
Mfr. Part No.LT1054CDW
HK$28.938
Each (In a Tube of 40)
units
Inverting, Step Up - - Surface Mount SOIC 16 - 10.28 x 7.52 x 2.35mm 2.35mm 10.28mm 15 V +70 °C - 3.5 V
RS Stock No. 146-1213
Mfr. Part No.ICL7660CSA+
HK$16.77
Each (In a Tube of 100)
units
Inverting, Step Up - - Surface Mount SOIC 8 - 5 x 4 x 1.5mm 1.5mm 5mm 10 V +70 °C -1.5 V, 20 V 1.5 V
RS Stock No. 786-9746
Mfr. Part No.LTC1044AIS8#PBF
HK$41.59
Each (In a Pack of 2)
units
Step Up 200µA 5 kHz Surface Mount SOIC 8 5 V 5.004 x 3.988 x 1.498mm 1.498mm 5mm 12 V +85 °C 3.5 V, 5 V 1.5 V
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