MIC68400YML-TR

MIC68400 4A Sequencing LDO with Tracking and Ramp Control Features General Description Stable with 10 F Ceramic Capacitor The MIC68400 is a high peak current LDO regulator designed specifically for powering applications such as Input Voltage Range: 1.65V to 5.5V FPGA core voltages that require high start up current 0.5V Reference with lower nominal operating current. Capable of 2.0% Output Tolerance over Temperature sourcing 4A of current for start-up, the MIC68400 4A Maximum Output Current Peak Start-Up provides high power from a small QFN leadless 3A Continuous Operating Current package. The MIC68400 can also implement a variety of power-up and power-down protocols such as Tracking on Turn-On and Turn-Off with Pin sequencing, tracking, and ratiometric tracking. Strapping Timing Controlled Sequencing On/Off The MIC68400 operates from a wide input range of Programmable Ramp Control for In-Rush Current 1.65V to 5.5V, which includes all of the main supply voltages commonly available today. It is designed to Limiting and Slew Rate Control of the Output drive digital circuits requiring low voltage at high Voltage During Turn-On and Turn-Off currents (i.e. PLDs, DSP, microcontroller, etc.). The Power-On Reset (POR) Supervisor with MIC68400 incorporates a delay pin (Delay) for control Programmable Delay Time of power on reset output (POR) at turn-on and Single Master can Control Multiple Slave power-down delay at turn-off. In addition there is a Regulators with Tracking Output Voltages ramp control pin (RC) for either tracking applications or Tiny 4 mm x 4 mm QFN Package output voltage slew rate adjustment at turn-on and Maximum Dropout (V V ) of 500 mV over IN OUT turn-off. This is important in applications where the load Temperature at 3A Output Current is highly capacitive and in-rush currents can cause Fixed and Adjustable Output Voltages supply voltages to fail and microprocessors or other complex logic chips to hang up. Excellent Line and Load Regulation Specifications Logic Controlled Shutdown Multiple MIC68400s can be daisy chained in two modes. In tracking mode the output voltage of the Thermal Shutdown and Current-Limit Protection Master drives the RC pin of a Slave so that the Slave Applications tracks the main regulator during turn-on and turn-off. In sequencing mode the POR of the Master drives the FPGA/PLD Power Supply enable (EN) of the Slave so that it turns on after the Networking/Telecom Equipment Master and turns off before (or after) the Master. This Microprocessor Core Voltage behavior is critical for power-up and power-down High Efficiency Linear Post Regulator control in multi-output power supplies. The MIC68400 Sequenced or Tracked Power Supply is fully protected offering both thermal, current limit protection, and reverse current protection. The MIC68400 has a junction temperature range of 40C to +125C and is available in fixed as well as an adjustable option. The MIC68400 is offered in the tiny 16-pin 4 mm x 4 mm QFN package. 2017 Microchip Technology Inc. DS20005824A-page 1MIC68400 Package Types MIC68400, FIXED VOLTAGES MIC68400, ADJ. VOLTAGES 16-Lead QFN (ML) 16-Lead QFN (ML) 16 15 14 13 16 15 14 13 VIN 1 12 VOUT VIN 1 12 VOUT VIN 2 11 VOUT VIN 2 11 VOUT SNS DELAY 3 10 ADJ DELAY 3 10 RC 4 9 POR RC 4 9 POR 5 6 7 8 5 6 7 8 Typical Application Circuits MIC68400 Sequenced Dual Power Supply for I/O and Core Voltage of Processor Processor 47k 47k MIC68400-1.8YML V = 3.3V IN IN1 OUT1 I/O 10F U1 EN EN1 SNS1 Master RC1 DLY1 POR1 GND 0.6nF 10nF MIC68400-1.5YML IN2 OUT2 CORE 0.1F U2 EN2 SNS2 10F Slave RC2 DLY2 POR2 /RESET GND 0.7nF 1nF U1.EN U1.T U1.T DLY DLY U1.RC U1.T RC U1.DLY U1 Fully Shut Down U1.OUT U2.EN = U1.POR U2.RC U2.T RC2 U2.DLY U2.T U2.T DLY DLY U2 Fully Shut Down U2.OUT U2.POR DS20005824A-page 2 2017 Microchip Technology Inc. EN VIN NC VIN GND NC GND VOUT EN VIN NC VIN GND NC GND VOUT