Switched capacitor voltage converters and inverters
5 November 2003
Power Electronics / Power Management
Analog Devices' ADM660/ADM8660 are high current CMOS switched capacitor voltage converter ICs and the ADM8828/ADM8829 are switched capacitor voltage inverter ICs with shutdown.
The ADM660/ADM8660 invert the input voltage, producing VOUT = -VIN. The inverting scheme is ideal for generating a negative rail in a single-supply system. Only two small external capacitors are needed for the charge pump. Output currents up to 50 mA with greater than 90% efficiency are achievable. A frequency control (FC) input pin is used to select either 25 kHz or 120 kHz charge pump operation, optimising the capacitor sizes.
For applications that demand a higher voltage, the ADM660 can be used to double the input voltage, VOUT = 2 X VIN. Output voltages of 14 V maximum are attainable. In shutdown mode, the ADM660/ADM8660 consume 300 nA of current.
The ADM8828/ADM8829 are charge pump voltage inverters that generate a negative supply from a positive input. Input voltages ranging from +1,5 V to +5,5 V can be inverted into a -1,5 V to -5,5 V output supply. This inverting scheme is ideal for generating a negative rail in single-power supply systems. Only two small external capacitors are needed. Output currents up to 25 mA with greater than 99% efficiency are achievable. The ADM8828 also features a low power shutdown (SHDN) pin that can be used to disable the device and reduce the quiescent current to 20 nA.
ADM660/ADM8660 key features: 100 mA output current; 2,2 µF or 10 µF capacitors; only 0,3 V drop at 30 mA load; 1,5 V to 7 V supply; 600 µA quiescent current; selectable charge pump frequency (25 kHz/120 kHz).
ADM8828/ADM8829 key features: 99% voltage conversion efficiency; 18 Ω output resistance; high output current; shutdown function; require only two 1 µF capacitors; 1,5 to 5,5 V input range; 600 mA quiescent current; 20 nA shutdown current (ADM8828).
Information from Bekithemba Electronic and Mechanical Distributor. For more information contact 012 543 1451.
Further reading:
Rugged railway-grade DC-DC power modules
iCorp Technologies
Power Electronics / Power Management
iCorp Technologies has introduced the AIPUPOWER ZCD100 and ZCD150 Series, a family of rugged DC-DC converters designed to meet the demanding electrical and environmental requirements of railway and transportation systems.
Read more...
Four-quadrant regenerative grid simulator
Conical Technologies
Power Electronics / Power Management
The IT7900EP series high-performance regenerative grid simulator from ITECH is a full four-quadrant AC grid simulator capable of both sourcing and sinking power.
Read more...
90 W PSU with 150% boost capability
Brabek
Power Electronics / Power Management
RECOM’s cost effective REFIN2U-S90/CL DIN rail AC/DC boasts a 90 W rating with a boost capability of 150% for 4,5 seconds to allow for surge loads.
Read more...
Standalone USB PD controller
Future Electronics
Power Electronics / Power Management
The STUSB4531 from STMicroelectronics is a standalone USB Power Delivery sink controller designed to streamline the implementation of USB-C power negotiation in sink devices without requiring a full software stack on a host microcontroller.
Read more...
Power module enhances AI data centre power density
Altron Arrow
Power Electronics / Power Management
Microchip’s MCPF1525 power module with PMBus delivers 25 A DC-DC power and is stackable up to 200 A.
Read more...
MIL-Spec DC-DC power converters
Vepac Electronics
Power Electronics / Power Management
PowerGood has introduced a range of 15 W to 600 W military DC-DC power converters engineered for mission critical defence applications.
Read more...
Compact power MOSFET for high current switching
Future Electronics
Power Electronics / Power Management
onsemi’s NTMFSC2D6N08X is a high-performance 80 V N-channel power MOSFET engineered for demanding switching and power conversion applications.
Read more...
DC link capacitors for demanding applications
RS South Africa
Power Electronics / Power Management
TDK Corporation has announced the B3271xP series of DC link film capacitors, offering high thermal robustness for demanding automotive and industrial power electronics.
Read more...
N-channel power MOSFETs
TRX Electronics
Power Electronics / Power Management
The TSM2N7002 series from Taiwan Semiconductor are logic-level N-channel power MOSFETs designed with low drain-source on-state resistance, reducing conduction losses and improving efficiency in switching applications.
Read more...
Smart power protection, simplified
TRX Electronics
Power Electronics / Power Management
onsemi electronic fuses (eFuses) deliver integrated, intelligent protection by combining overcurrent, overvoltage, over-temperature, reverse polarity, and inrush current safeguards in a single compact IC.
Read more...
printer friendly version