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. 165-3329
Mfr. Part No.TC1240AECHTR
BrandMicrochip
£0.526
Each (On a Reel of 3000)
Units
Voltage Doubler 50mA 125 kHz Surface Mount SOT-23 6 3.25 V 3.1 x 1.75 x 1.3mm 1.3mm 3.1mm 4 V +85 °C 11.6 V 2.5 V
RS Stock No. 768-1473
Mfr. Part No.TC1240AECHTR
BrandMicrochip
£0.626
Each (In a Pack of 10)
Units
Voltage Doubler 50mA 125 kHz Surface Mount SOT-23 6 3.25 V 3.1 x 1.75 x 1.3mm 1.3mm 3.1mm 4 V +85 °C 11.6 V 2.5 V
RS Stock No. 545-5988
Mfr. Part No.LTC1044CN8#PBF
£3.12
Each
Units
Inverting, Step Down, Step Up - - Through Hole PDIP 8 - 10.16 x 6.48 x 3.3mm 3.3mm 10.16mm 9 V +85 °C -1.5 V, 4.5 V 1.5 V
RS Stock No. 145-6358
Mfr. Part No.LTC1044CN8#PBF
£2.009
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. 145-1324
Mfr. Part No.LTC3260EMSE#PBF
£3.934
Each (In a Tube of 37)
Units
Inverting 100mA 550 kHz Surface Mount MSOP 16 4.5 → 32 V 4.039 x 3 x 0.86mm 0.86mm 4.04mm 32 V +150 °C -32 V 4.5 V
RS Stock No. 851-6768
Mfr. Part No.LTC3260EMSE#PBF
£6.41
Each
Units
Inverting 100mA 550 kHz Surface Mount MSOP 16 4.5 to 32 V 4.039 x 3 x 0.86mm 0.86mm 4.04mm 32 V +150 °C -32 V 4.5 V
RS Stock No. 823-4006
Mfr. Part No.TC1044SCPA
BrandMicrochip
£0.709
Each (In a Pack of 10)
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. 178-4969
Mfr. Part No.TC1044SCPA
BrandMicrochip
£0.595
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. 921-5551
Mfr. Part No.ICL7660CPAZ
£1.354
Each (In a Pack of 5)
Units
Inverting, Step Up - - Through Hole PDIP 8 - 10.16 x 7.11 x 4.95mm 4.95mm 10.16mm 10 V +70 °C -1.5 V 1.5 V
RS Stock No. 923-1411
Mfr. Part No.ICL7660CPAZ
£1.147
Each (In a Tube of 50)
Units
Inverting, Step Up - - Through Hole PDIP 8 - 10.16 x 7.11 x 4.95mm 4.95mm 10.16mm 10 V +70 °C -1.5 V 1.5 V
RS Stock No. 122-0078
Mfr. Part No.NCP1729SN35T1G
£0.306
Each (On a Reel of 3000)
Units
Inverting 100mA 35 kHz Surface Mount TSOP 6 - 3 x 1.5 x 0.94mm 0.94mm 3mm 5.5 V +150 °C -1.15 V 1.15 V
RS Stock No. 464-186
Mfr. Part No.NCP1729SN35T1G
£0.738
Each (In a Pack of 5)
Units
Inverting 100mA 35 kHz Surface Mount TSOP 6 - 3 x 1.5 x 0.94mm 0.94mm 3mm 5.5 V +150 °C -1.15 V 1.15 V
RS Stock No. 912-7211
Mfr. Part No.ADM660ARZ
£3.488
Each (In a Tube of 98)
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. 412-585
Mfr. Part No.ADM660ARZ
£4.12
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. 920-3407
Mfr. Part No.TPS60403DBVT
£0.46
Each (On a Reel of 250)
Units
Inverting, Step Down/Step Up - - Surface Mount SOT-23 5 - 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 5.25 V +125 °C -1.6 V 1.8 V
RS Stock No. 889-5572
Mfr. Part No.MCP1253-33X50I/MS
BrandMicrochip
£0.872
Each (In a Tube of 100)
Units
Step Down/Step Up 120mA 1 MHz Surface Mount MSOP 8 - 3 x 3 x 0.85mm 0.85mm 3mm 5.5 V +85 °C - 2.1 V
RS Stock No. 822-9925
Mfr. Part No.LT1054IN8#PBF
£7.27
Each
Units
Bi-Polar, Monolithic 100mA 40 kHz Through Hole PDIP 8 3.5 → 15 V 10.16 x 6.477 x 3.302mm 3.302mm 10.16mm 15 V +100 °C 15 V 3.5 V
RS Stock No. 922-2707
Mfr. Part No.TPS60403DBVR
£0.328
Each (On a Reel of 3000)
Units
Inverting - - Surface Mount SOT-23 5 - 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 5.25 V +125 °C -1.6 V 1.8 V
RS Stock No. 517-1208
Mfr. Part No.TPS60403DBVT
£0.798
Each (In a Pack of 5)
Units
Inverting, Step Down, Step Up - - Surface Mount SOT-23 5 - 2.9 x 1.6 x 1.15mm 1.15mm 2.9mm 5.25 V +125 °C -1.6 V 1.8 V
RS Stock No. 155-7582
Mfr. Part No.LT1054IN8#PBF
£4.457
Each (In a Tube of 50)
Units
Bi-Polar, Monolithic 100mA 40 kHz Through Hole PDIP 8 3.5 → 15 V 10.16 x 6.477 x 3.302mm 3.302mm 10.16mm 15 V +100 °C 15 V 3.5 V
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