MPQ8634A

16V, 12A, Sync, Step-Down Converter with Adjustable Current Limit, Programmable Frequency, and Voltage Tracking

Datasheet

概要

The MPQ8634A is a fully integrated, high-frequency, synchronous, buck converter. The MPQ8634A offers a very compact solution that achieves up to 12A output current with excellent load and line regulation over a wide input supply range. The MPQ8634A operates at high efficiency over a wide output current load range.

The MPQ8634A adopts an internally compensated constant-on-time (COT) control mode that provides fast transient response and eases loop stabilization.

The operating frequency can be set to 600kHz, 800kHz, or 1000kHz easily with MODE configuration, allowing the MPQ8634A frequency to remain constant regardless of the input/output voltages.

The output voltage start-up ramp is controlled by an internal 1.5ms timer. It can be increased by adding a capacitor on TRK/REF. An open-drain power good (PGOOD) signal indicates when the output is within its nominal voltage range. PGOOD is clamped at around 0.7V with an external pull-up voltage when the input supply fails to power the MPQ8634A.

Fully integrated protection features include over-current protection (OCP), over-voltage protection (OVP), under-voltage protection (UVP), and over-temperature protection (OTP).

The MPQ8634A requires a minimal number of readily available, standard, external components and is available in a QFN-21 (3mmx4mm) package.

機能と利点

Wide Input Voltage Range:
- 2.85V to 16V with External 3.3V VCC Bias
- 4V to 16V with Internal VCC Bias or External 3.3V VCC Bias
Differential Output Voltage Remote Sense
Programmable Accurate Current Limit Level
12A Output Current
Low R_DS(ON) Integrated Power MOSFETs
Proprietary Switching Loss Reduction Technique
Adaptive COT for Ultrafast Transient Response
Stable with Zero ESR Output Capacitor
0.5% Reference Voltage over 0°C to +70°C Junction Temperature Range
1% Reference Voltage from -40°C to +125°C Junction Temperature Range
Pin-Selectable Pulse-Skip Mode or Forced CCM Operation
Excellent Load Regulation
Output Voltage Tracking
Output Voltage Discharge
PGOOD Actively Clamped at a Low Level during Power Failure
Programmable Soft-Start Time from 1.5ms
Pre-Bias Start-Up
Selectable Switching Frequency from 600kHz, 800kHz, and 1000kHz
Latch-Off OCP, UVP, UVLO, Thermal Shutdown, and Latch-Off for OVP
Output Adjustable from 0.9V to 90%*VIN, up to 6V Max
Available in a QFN-21 (3mmx4mm) Package

Evaluation Tools

EVQ8634A-LE-00A Evaluation Kit High-Efficiency, 16V, 12A, Synchronous Step-Down Converter Evaluation Board

The EVQ8634A-LE-00A is an evaluation board for the MPQ8634A, a high-efficiency, monolithic, synchronous step-down converter. The evaluation board can deliver 12A of continuous load current over a wide operating input range. High efficiency can be achieved over a wide output current load range.

The MPQ8634A adopts internally compensated constant-on-time (COT) control mode that provides fast transient response and eases loop stabilization. This evaluation board can be turned on or off via a remote on/off input (EN) that is referenced to ground. This input is compatible with popular logic devices.

￥2,716.25
+ tax