Part Number: MAX17497A

Function: AC-DC and DC-DC Peak-Current-Mode Converter

Package: TQFN 12 Pin Type

Manufacturer: Maxim Integrated

Pinouts:

 

Description

The devices include both a current mode fixed-frequency flyback converter and a synchronous step-down regulator. They contain all the control circuitry required to design wide input-voltage noniso lated power supplies to supply multiple output rails for smart meters, industrial control, and other similar applications. The MAX17497A has its rising/falling undervoltage lockout (UVLO) thresholds optimized for universal offline (85V AC to 265V AC) applications, while the MAX17497B supports undervoltage lockout (UVLO) thresholds suit able to low-voltage DC-DC applications. Both devices also include a 3.3V fixed-output synchronous step-down regulator that delivers up to 600mA load current.

The switching frequency of the MAX17497A flyback converter is 250kHz, while the MAX17497B flyback/ boost converter is 500kHz. The internally compensated synchronous step-down regulator switches at 1MHz on both versions. These frequencies allow the use of tiny magnetic and filter components resulting in compact, cost-effective power supplies. An EN/UVLO input allows the user to start the power supply precisely at the desired input voltage, while also functioning as an on/off pin. The OVI pin enables implementation of an input overvoltage protection scheme that ensures the converter shutsdown when the DC input voltage exceeds the desired maximum value.

Benefits and

Features

1. Reduced Component Count and Board Space
(1) Flyback/Boost with Integrated Internally Compensated Step-Down Regulator
(2) No Current-Sense Resistor
(3) Space-Saving 16-Pin (3mm x 3mm) TQFN Package

2. Minimal Radio Interference
(1) 250kHz Switching in Offline Version Minimizes Interference with Radio Receivers in Smart Meter Applications

3.  Reduced Inrush Current
(1) Programmable Flyback/Boost Soft-Start  Internal Digital Soft-Start for Step-Down Regulator

4.  Reduced Power Dissipation Under Fault
(1) Hiccup Mode Overcurrent Protection Thermal Shutdown with Hysteresis

5. Robust Protection Features
(1) Flyback/Boost Programmable Current Limit Input Overvoltage Protection

Other data sheets are available within the file: MAX17497B

MAX17497A Datasheet PDF Download

Part Number: TPS54040-Q1

Function: 0.5-A, 42-V, STEP-DOWN SWIFT DC/DC CONVERTER

Package: MSOP PowerPAD, VSON 10 Pin Type

Manufacturer: Texas Instruments

Pinouts:

 

Description

The TPS54040-Q1, TPS54040 device is a 42-V 0.5-A step-down regulator with an integrated high-side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low-ripple pulse-skip mode reduces the no load, input supply current to 116 μA. Using the enable pin, shutdown supply current is reduced to 1.3 μA, when the enable pin is low.

Undervoltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage startup ramp is controlled by the slow start pin that can also be configured for sequencing or tracking. An open drain power-good signal indicates the output is within 92% to 109% of its nominal voltage. A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold back and thermal shutdown protects the part during an overload condition.

Features

1. Qualified for Automotive Applications

2. 3.5-V to 42-V Input Voltage Range

3. 200-mΩ High-Side MOSFET

4. 100-kHz to 2.5-MHz Switching Frequency

 

TPS54040-Q1 Datasheet PDF Download

Other data sheets are available within the file:

5404Q, TPS54040Q1, TPS54040QDGQRQ1, TPS54040QDRCRQ1