Enpirion Power Datasheet ER3125QI 2.5 A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter ER3125QI Datasheet NOT RECOMMENDED FOR NEW DESIGN The ER3125QI is a 36V, 2.5A synchronous buck or boost buck Features controller with a high-side MOSFET and low-side driver integrated. In buck mode, the ER3125QI supports a wide input range of 3V to Buck mode: input voltage range 3V to 36V (refer to Input 36V. In boost-buck mode, the input range can be extended down to Voltage on page 16 for more details) 2.5V and output regulation can be maintained when V drops PVIN Boost mode expands operating input voltage lower than 2.5V below V , enabling sensitive electronics to remain on in low input OUT (refer to Input Voltage on page 16 for more details) voltage conditions. Selectable forced PWM mode or LLM mode The ER3125QI has a flexible selection of operation modes of 300A IC quiescent current (LLM, no load) 180A input forced PWM mode and LLM mode. In LLM mode, the quiescent current (LLM, no load, V tied to AVIN) OUT quiescent input current is as low as 180A (AVIN connected to Less than 5A (MAX) shutdown input current (IC disabled) V ). The load boundary between LLM and PWM can be OUT Operational topologies programmed to cover wide applications. - Synchronous buck The low-side driver can be either used to drive an external low- - Non-synchronous buck side MOSFET for a synchronous buck, or left unused for a - Two-stage boost buck standard non-synchronous buck. The low-side driver can also be - Non-inverting single inductor buck boost used to drive a boost converter as a pre-regulator followed by a Programmable frequency from 200kHz to 2.2MHz and buck controlled by the same IC, which greatly expands the frequency synchronization capability operating input voltage range down to 2.5V or lower (Refer to 1% tight voltage regulation accuracy Typical Application Schematic III - Boost Buck Converter on page 4). Reliable overcurrent protection - Temperature compensated current sense The ER3125QI offers the most robust current protections. It uses - Cycle-by-cycle current limiting with frequency foldback peak current mode control with cycle-by-cycle current limiting. - Hiccup mode for worst case short condition It is implemented with frequency foldback under current limit condition besides that, the hiccup overcurrent mode is also 20 Ld 4x4 QFN package implemented to guarantee reliable operations under short Pb-free (RoHS compliant) circuit conditions. Applications The ER3125QI has comprehensive protections against various faults including overvoltage and over-temperature protections, FPGA Applications etc. General purpose 24V bus power Battery power Point of load Embedded processor and I/O supplies 100 POK 95 6V V PVIN PVIN V PVIN 90 LLM 12V V PVIN 85 AVIN 80 AVINO 36V V PVIN 75 ER3125QI SW 24V V PVIN RCLX 70 65 60 BOOST 55 FSW AGND 50 0.1m 1m 10m 100m 1.0 2.5 LOAD CURRENT (A) FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, LLM MODE, V 5V, T = OUT A +25C 2014 Altera Corporation. All rights reserved. ALTERA, ARRIA, CYCLONE, ENPIRION, HARDCOPY, MAX, MEGACORE, NIOS, QUARTUS and STRATIX words and logos are trademarks of Altera Corporation and registered in the U.S. Patent and Trademark Office and in other countries. All other words and logos identified as trademarks or service marks are the property of ISO their respective holders as described at www.altera.com/common/legal.html. Altera warrants performance of its semiconductor 9001:2008 products to current specifications in accordance with Altera s standard warranty, but reserves the right to make changes to any 101 Innovation Drive Registered products and services at any time without notice. Altera assumes no responsibility or liability arising out of the application or use San Jose, CA 95134 of any information, product, or service described herein except as expressly agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device specifications before relying on any published information and before placing orders www.altera.com for products or services. May 2014 Altera Corporation Subscribe 10040 May 28, 2014 Rev A EFFICIENCY (%)Page 2 Ordering Information PART NUMBER PART TEMP. PACKAGE (Notes 1, 2) MARKING RANGE (C) (PB-Free) PKG. DWG. ER3125QI R3125 -40 to +105 20 Ld 4x4 QFN L20.4x4C NOTES: 1. Please refer to Packing and Marking Information: www.altera.com/support/reliability/packing/rel-packing-and-marking.html 2. These Altera Enpirion Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Altera Enpirion Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Pin Configuration ER3125QI (20 LD QFN) TOP VIEW FSW 21 PAD BOOST Functional Pin Descriptions PIN NAME PIN DESCRIPTION EN 1 The controller is enabled when this pin is left floating or pulled HIGH. The IC is disabled when this pin is pulled LOW. Range: 0V to 5.5V. FSW 2 Connecting this pin to AVINO, or GND, or leaving it open will force the IC to have 500kHz switching frequency. The oscillator switching frequency can also be programmed by adjusting the resistor from this pin to GND. SS 3 Connect a capacitor from this pin to ground. This capacitor, along with an internal 5A current source, sets the soft-start interval of the converter. Also, this pin can be used to track a ramp on this pin. FB 4 This pin is the inverting input of the voltage feedback error amplifier. With a properly selected resistor divider connected from V to FB, the OUT output voltage can be set to any voltage between the power rail (reduced by maximum duty cycle and voltage drop) and the 0.8V reference. Loop compensation is achieved by connecting an RC network across COMP and FB. The FB pin is also monitored for overvoltage events. COMP 5 Output of the voltage feedback error amplifier. RCLX 6 Programmable current limit pin. With this pin connected to the AVINO pin, or to GND, or left open, the current limiting threshold is set to default of 3.6A the current limiting threshold can be programmed with a resistor from this pin to GND. Enpirion Power Datasheet ER3125QI 2.5A Regulator with Integrated High-Side MOSFET for May 2014 Altera Corporation Synchronous Buck or Boost Buck Converter 10040 May 28, 2014 Rev A AVIN RCLX LLM AVINO AGND POK PVIN SW SW PVIN