Ricoh Launches a Single Chip PMU / PMIC IC for Industrial and Consumer Applications

Ricoh Electronic Devices Co., Ltd. in Japan has launched two advanced PMU ICs for industrial and consumer purposes. These ICs are a single chip solution and provides four high-efficiency step-down DC/DC converters, seven low-dropout regulators, four GPIOs, an interrupt controller (INTC) and an I2C-Bus interface. The output voltages and the power-on/off sequence settings can be tailored in a profile and saved in a built-in One-Time Programmable (OTP) memory.

 

 

Ricoh has been developing mixed signal PMU ICs for over 10 years and are used in for example high-end mobile phones and tablets etc., making great contributions reducing power consumption, board space and is more cost efficient compared to a solution with individual power management ICs. A power supply for Application Processors, MCUs, FPGAs is often complex, meaning that an array of power management devices is required to provide power to all individual circuits. The easiest way to build an efficient power management system is to use a single IC that has all power control functions integrated. 

The RN5T5610 is an industrial version suitable for continuous operation under wide operating temperature conditions whilst the RN5T5612 is designed for consumer applications. The PMUs include custom programmable features by OTP for initial output voltage setting and start-up/shut-down sequencing. A 2-wire I2C bus interface bus, operating at 400kHz or 3.4MHz, provides additional control by register settings such as turning individual output voltages on or off as well as adjusting the DC/DC converter and LDO output voltage levels by a Dynamic Voltage Scaling (DVS) feature. Step-rate for adjusting voltages is 50mV for OTP and 12.5mV for register settings.

The PMU ICs distinguishes On, Off and Sleep operating modes, the current consumption varies from Typical 13µA in Off-mode to maximum 440µA in On-mode depending on which outputs are enabled.

The four integrated Buck DC/DC Converters are able to provide 2x 2A and 2x 3A output current and have a peak efficiency level of 95%, all are operating with a 1µH inductor and 22µF output capacitor.

Five LDO regulators can be used for multipurpose and provide 3x 300mA and 2x 200mA, they have a fast-transient response, low output voltage noise and high ripple rejection ratio. Two additional LDO’s are always on but can be configured as always off as well when not used. One to power an RTC with a coin battery as a back-up power supply and also includes a reverse current protection. The other LDO is used for other purposes. 

Target applications are an Industrial Controller Unit, Tablet, Set-Top Box, a power supply for application processors, etcetera. The RN5T5610 and RN5T5612 are available in a QFN0707-48-P25 package and are identical products but differ in operating temperature range. A reference circuit is available to simplify the design of the power supply as well as a bill of material with recommended components. To achieve a maximum performance of the circuit, an example circuit board layout is available for your convenience. Samples and fully assembled + tested evaluation boards can be purchased from our authorized local distributors and online partners.

 

Features

RN5T5610 / RN5T5612

• Operating Voltage Range (Maximum Rating)                        2.7 to 5.5 V (6.0 V)
• Operating Temperature Range RN5T5610 / RN5T5612      -40 to 105°C / -40 to 85°C

 

System

• I2C-Bus interface                                                                    3.4 MHz and 400 kHz
• Detector Function                                                                   System/IO-Voltage-detector, UVLO, DETVSB
• Thermal Shutdown Function
• Watchdog Timer
• Power-on Key Input for System’s power up
• Power-on Reset Output for CPU
• Flexible Power-on/off Sequence by OTP
• Flexible DCDCx and LDOx Default-on/off Control by OTP

 

High Efficiency Step-down DC/DC Converters

• DCDC1 / 2                                                                               0.6 to 3.5 V (Max. 3000 mA)
• DCDC3 / 4                                                                               0.6 to 3.5 V (Max. 2000 mA)
• Soft-start circuit
• Equipped with DVS and Power Save Mode (PSM)

 

LDO Regulators

• LDO1 / 2                                                                                   0.9 to 3.5 V (Max. 300 mA)
• LDO3                                                                                        0.6 to 3.5 V (Max. 300 mA)
• LDO4 / 5                                                                                   0.9 to 3.5 V (Max. 200 mA)
• LDORTC1 (Always-on, for Coin battery)                                  1.2 to 3.5 V (Max. 30 mA)
• LDORTC2 (Always-on)                                                             0.9 to 3.5 V (Max. 10 mA)
• Overcurrent Protection and Short-circuit Protection

 

4-channel GPIOs

• Interrupt function (level/edge) for input signals
• Power-on output signal for external devices
• Power on/off input for System’s power up/down
• Controllable DCDCx and LDOx by external input
• LDORTC2 output via GPIO2 pin
• Current Sink for LED via GPIO0/1 pins                                      Max. 15 mA
• 32kHz output via GPIOx as a clock for external devices
• Interrupt Controller (INTC)  
• Package                                                                                      QFN0707-48-P25 (0.5 mm pitch)

 

Learn more

• https://www.n-redc.co.jp/en/products/multi-channel-pmic/rn5t5610/
• https://www.n-redc.co.jp/en/products/multi-channel-pmic/rn5t5612/

 

About Ricoh Electronic Devices Co., Ltd

Ricoh Electronic Devices Company, Ltd. (REDC) is a leading global provider of semiconductor products, offering a comprehensive portfolio of CMOS Power Management and Real Time Clock IC solutions that enable engineers to design advanced applications for the consumer, industrial, Internet of Things (IoT), medical and automotive markets. 

REDC has extensive expertise in small-sized products providing low-supply current, high-accuracy, high efficiency and high-reliability. 

With certificates for quality management (ISO9001 and ISO/TS16949) and environmental management (ISO14001), REDC strives to provide high quality products and solutions with less impact on the global environment.

The company's headquarters are based in Japan, as well as development, sales and manufacturing facilities. Regional sales and support offices are located in North America, Europe, and Asia.