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. 464-186
Mfr. Part No.NCP1729SN35T1G
PHP41.246
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. 122-0078
Mfr. Part No.NCP1729SN35T1G
PHP20.95
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. 121-6502
Mfr. Part No.MAX1720EUTG
PHP13.07
Each (On a Reel of 3000)
units
Charge Pump, Inverting 100mA 21 kHz Surface Mount TSOP 6 1.15 → 6 V 3.1 x 1.7 x 1mm 1mm 3.1mm 6 V +85 °C 0.3 V 1.5 V
RS Stock No. 800-9866
Mfr. Part No.CAT3200HU2-GT3
PHP92.93
Each (In a Pack of 5)
units
Charge Pump 100mA 2.6 MHz Surface Mount UDFN 8 - 2 x 2 x 0.5mm 0.5mm 2mm 4.5 V +85 °C 5.2 V 2.7 V
RS Stock No. 163-2072
Mfr. Part No.CAT3200HU2-GT3
PHP52.952
Each (On a Reel of 3000)
units
Charge Pump 100mA 2.6 MHz Surface Mount UDFN 8 - 2 x 2 x 0.5mm 0.5mm 2mm 4.5 V +85 °C 5.2 V 2.7 V
RS Stock No. 806-2447
Mfr. Part No.MAX1720EUTG
PHP29.98
Each (In a Pack of 20)
units
Charge Pump, Inverting 100mA 21 kHz Surface Mount TSOP 6 1.15 → 6 V 3.1 x 1.7 x 1mm 1mm 3.1mm 6 V +85 °C 0.3 V 1.5 V