The following document contains information on Cypress products. The document has the series name, product name, and ordering part numbering with the prefix MB. However, Cypress will offer these products to new and existing customers with the series name, product name, and ordering part number with the prefix CY. How to Check the Ordering Part Number 1. Go to www.cypress.com/pcn. 2. Enter the keyword (for example, ordering part number) in the SEARCH PCNS field and click Apply. 3. Click the corresponding title from the search results. 4. Download the Affected Parts List file, which has details of all changes For More Information Please contact your local sales office for additional information about Cypress products and solutions. About Cypress Cypress is the leader in advanced embedded system solutions for the world s most innovative automotive, industrial, smart home appliances, consumer electronics and medical products. Cypress microcontrollers, analog ICs, wireless and USB-based connectivity solutions and reliable, high-performance memories help engineers design differentiated products and get them to market first. Cypress is committed to providing customers with the best support and development resources on the planet enabling them to disrupt markets by creating new product categories in record time. To learn more, go to www.cypress.com. MB39C031 2ch Buck DC/DC Converter + 1ch LDO 2 with I C Interface and SW FET Description The MB39C031 contains 2ch buck DC/DC converter and 1ch LDO. It is possible to supply the main power supply line in a system by using only one chip. The current mode system is adopted for the DC/DC converter, and it is possible to use the chip inductor with the high switching frequency operation which contains internal SW FET. The MB39C031 contains the output setting resistor and the the phase compensation circuit, and contributes to reduce the number of external components and the mounting area. 2 Also, it contains the CTL input pin which can control the ON/OFF for each CH, the Power Good signal output pin and the I C communication interface, therefore it is easy to design the power supply sequence. 2 It is possible to tune in the output voltage exactly using the I C communication and possible to correspond to the DVS/ASV system. Features Operating input voltage range:2.5 V to 5.5 V (Maximum rating: 7 V) Output voltage setting range, Maximum output current: DD1*:1.0 V to 1.3 V (20 mV/step), 1.4 A (DC) DD2*:1.2 V to 1.95 V (50 mV/step), 0.6 A (DC) LDO:2.8 V/2.85 V/3.0 V/3.3 V, 0.25 A (DC) Note: Each channel has selective preset voltage (Lineup for a total of 32 kinds) . Soft-start time setting range: 0.9 ms to 14.3 ms (approximately 0.9 ms/step) Switching frequency for the DC/DC block:3 MHz (fixed) 2 Communication interface: I C (ON/OFF, Output voltage, Soft-start time setting) Built-in PFM/PWM auto switching mode Built-in function: Output setting resistor, Phase compensation circuit, Discharge resistor, Soft-start Each Channel Power Good output function (Open-drain) Protection function: Under voltage lockout protection circuit (UVLO), Over current protection circuit (OCP), Thermal shutdown protection circuit (TSD) Error signal output pin installed (Open-drain) Small package: QFN28 (4 mm 4 mm 0.8 mm, 0.4 mm pitch) *: DD1,DD2 : DC/DC converter block 1, 2 Applications Network equipment: Wifi-tuner, Surveillance camera Data-storage device: HDD, SSD, Picture recording equipment Image and voice output equipment: MFP, Printer, Scanner, Projector, Electrophone, STB Various terminals: POS, FA, HEMS etc. Cypress Semiconductor Corporation 198 Champion Court San Jose, CA 95134-1709 408-943-2600 Document Number: 002-08407 Rev. *B Revised May 18, 2017