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. 146-1288
Mfr. Part No.MAX1044CPA+
HK$15.15
Each (In a Tube of 50)
units
Inverting 200µA 5 kHz Through Hole PDIP 8 30 V 9.91 x 7.87 x 4.45mm 4.45mm 9.91mm 200 V +70 °C 10 V -
RS Stock No. 155-7564
Mfr. Part No.LTC3203EDD-1#PBF
HK$26.11
Each (In a Tube of 121)
units
Step Up 500mA 1 MHz Surface Mount DFN 10 2.7 → 5.5 V 3 x 3 x 0.7mm 0.7mm 3mm 5.5 V +85 °C 4.5 V 2.7 V
RS Stock No. 774-7636
Mfr. Part No.TC1044SEPA
BrandMicrochip
HK$7.584
Each (In a Bag of 5)
units
Inverting 20mA 45 kHz Through Hole PDIP 8 - 10.16 x 6.6 x 4.06mm 4.06mm 10.16mm 12 V +85 °C -12 V 1.5 V
RS Stock No. 170-0794
Mfr. Part No.SC630ULTRT
BrandSemtech
HK$7.953
Each (On a Reel of 3000)
units
Step Down, Step Up - - Surface Mount MLPD UT EP 8 - 2 x 2 x 0.55mm 0.55mm 2mm 5.5 V +85 °C - 2.9 V
RS Stock No. 165-9520
Mfr. Part No.ICL7660EPA+
HK$27.21
Each (In a Tube of 50)
units
Inverting, Step Up 20mA 10 kHz Through Hole PDIP 8 - 9.91 x 7.87 x 4.45mm 4.45mm 9.91mm 10 V +85 °C - 1.5 V
RS Stock No. 162-4398
Mfr. Part No.TPS60122PWP
HK$11.389
Each (In a Tube of 70)
units
Step Up - - Surface Mount HTSSOP 20 - 6.5 x 4.4 x 1.15mm 1.15mm 6.5mm 3.6 V +85 °C - 1.8 V
New
RS Stock No. 190-0252
Mfr. Part No.MAX660CSA+
HK$67.65
Each (In a Pack of 2)
units
Inverting, Step Up - - Surface Mount SOIC 8 - 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V +70 °C -1.5 V, 11 V 1.5 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. 165-9118
Mfr. Part No.SI7661CSA+
HK$26.761
Each (In a Tube of 100)
units
Inverting - - Surface Mount SOIC 8 - 5 x 4 x 1.5mm 1.5mm 5mm 20 V +70 °C -4.5 V 4.5 V
RS Stock No. 884-7002
Mfr. Part No.LTC3245IDE#PBF
HK$54.505
Each (In a Pack of 2)
units
Buck Boost 250mA 500 kHz Surface Mount DFN 12 12 V 4 x 3 x 0.7mm 0.7mm 4mm 38 V +125 °C 5 V 2.7 V
RS Stock No. 919-9373
Mfr. Part No.LTC1046IS8#PBF
HK$46.901
Each (In a Tube of 100)
units
Inverting 50µA - Surface Mount SOIC 8 - 5.004 x 3.988 x 1.752mm 1.752mm 5mm 6 V +85 °C - 1.5 V
RS Stock No. 732-7680
Mfr. Part No.MAX1680ESA+
HK$46.18
Each
units
Inverting, Step Up 125mA 348 kHz Surface Mount SOIC 8 2 → 5.5 V 5 x 4 x 1.5mm 1.5mm 5mm 5.5 V +85 °C -3.75 V 2 V
RS Stock No. 146-0990
Mfr. Part No.MAX881REUB+
HK$26.314
Each (In a Tube of 50)
units
Inverting - - Surface Mount μMAX 10 - 3.05 x 3.05 x 0.95mm 0.95mm 3.05mm 5.5 V +85 °C -0.5 V 2.5 V
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