Pushbutton controller with supervisory functions

22 August 2007 Power Electronics / Power Management

Linear Technology has introduced the LTC2953-1, a high-reliability pushbutton controller that integrates supervisory voltage monitors and timers for tracking a switching regulator's input and output voltages. The device uses a power-fail input (PFI) comparator and under-voltage lockout (UVLO) comparator to trigger software and hardware control outputs when the input supply drops below two separate threshold voltages. An enable output forces the switching regulator's shutdown pin high when the input voltage drops below the UVLO threshold longer than an adjustable time period. The device also monitors the regulator's output and triggers a reset signal when the output voltage dips below an adjustable threshold due to excessive loading.

In addition to the input and output voltage comparators, this controller also includes a pushbutton input and software interrupt output. The LTC2953-1 combines these dual input, output and pushbutton functions in a tiny 3 mm x 3 mm DFN-12 package and is targeted for power path control, portable supervisors, PDAs and notebook computers.

Drawing only 14 μA of supply current, the LTC2953-1 operates over a wide 2,7 V to 27 V input supply range, serving single- or multibattery applications as well as industrial supply lines that operate from 24 V (±10% tolerance). The rugged pushbutton input is designed to operate in noisy environments and can withstand ESD strikes up to ±10 kV, per the human body model. A UVLO comparator gracefully latches power off, and the reset output remains low until the supply monitor input has been in compliance for 200 ms. The internal UVLO, PFI and voltage monitor comparators are accurate to 1,5% over the full temperature range of 0°C to 70°C and -65°C to 125°C for the commercial and industrial versions, respectively. A single capacitor controls the adjustable power-down timer in order to allow the system time to perform all of the necessary housekeeping procedures before shutting down.

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...

---