San Jose, Calif.—Summit Microelectronics' new SMB110 and SMB113 chips bring additional functionality to the company's line of Programmable Power Manager (PMM) ICs for digital supplies. Working directly from a 2.7 to 6-volt input, they're suited to one-cell lithium-ion battery applications. Higher input voltages (two-cell lithium-ion, or +12 volts) can be accommodated in many cases with simple applications configurations.
The SMB110 five-channel and SMB113 four-channel PPM ICs are optimized for increasingly complex consumer electronics applications. These include digital cameras and camcorders, DVD/MP3 portable media players/recorders, global positioning receivers, personal digital assistants (PDAs), LCD/TFT monitors, digital set-top boxes and digital video recorders (DVRs), as well as 3G "smart" mobile phones.
The SMB110 comprises five channels of power conversion— two pulse-width modulated (PWM) DC-DC step-down (buck) converters, a PWM DC-DC step-up (boost) converter, a PWM DC-DC inverting step-up/down
(buck/boost) converter, and a low-dropout (LDO) linear regulator. The SMB113 offers four identical channels, each having a PWM DC/DC step-down (buck) converter. The PWM channels on both devices are digitally programmable
for output characteristics and monitoring, including the accurate setting of output voltage to ±0.5 percent. The outputs are scalable with external MOSFET switches, further enhancing the chips' flexibility for various system requirements.
A suite of advanced power control features further enhance functionality, including static or dynamic output voltage programming and margining, independent channel sequencing and enable, and an output slew-rate control. Additionally, the devices provide complete power system diagnostics, including input and output monitoring for under/over-voltage (UV/OV), low/missing battery detection, AC adapter detection and Reset output. The margining function can be brought into service as an LED backlight brightness or audio-level control.
Programming is achieved via an I2C bus and configuration data is stored in non-volatile EEPROM memory, of which 96 bytes are available for user data storage. The devices can be programmed during
development and then used in a "fixed" configuration or they may be re-programmed in-system via the I2C interface.
The SMB110EV and SBM113EV companion evaluation boards are available to speed product development. The design kits
include menu-driven Microsoft Windows graphic user interface (GUI) software to automate programming tasks and also include all necessary hardware to interface to the parallel or USB port of a laptop or PC. The design kit software can be downloaded from the company's website. Once a user completes design and prototyping, the SMB110EV and SMB113EV outputs automatically generate a HEX data file that can be transmitted to the company for review and approval. The company then assigns a customer
identification code to the HEX file and programs the customer's production devices prior to final electrical test operations.
The SMB110 and SMB113 chips, packaged in a 5-by-5 mm, 32-pad QFN-32 and rated for operation over 0 to +70°C, are available now in production, both priced at $2.60 each in 1k quantities. The packages are lead-free and RoHS-standard compliant.
Summit Microelectronics, 1-408-436-9890, www.summitmicro.com