Renesas ZL8800

Description

The ZL8800 is a dual output or dual phase digital DC/DC controller. Each output can operate independently or be used together in a dual phase configuration for high current applications.

The ZL8800 supports a wide range of output voltages (0.54V to 5.5V) operating from input voltages as low as 4.5V up to 14V.

With the fully digital ChargeMode™ Control the ZL8800 will respond to a transient load step within a single switching cycle. This unique compensation-free modulation technique allows designs to meet transient specifications with minimum output capacitance thus saving cost and board space.

Intersil’s proprietary single wire DDC (Digital-DC™) serial bus enables the ZL8800 to communicate between other Intersil ICs. By using the DDC, the ZL8800 achieves complex functions such as inter-IC phase current balancing, sequencing and fault spreading, eliminating complicated power supply managers with numerous external discrete components.

The ZL8800 features cycle-by-cycle output overcurrent protection. The input voltage, output voltages and DrMOS/MOSFET driver supply voltages are overvoltage and overvoltage protected. Two external and one internal temperature sensor are available for temperature monitoring, one of which is used for under and over-temperature protection. A snapshot parametric capture feature allows users to take a snapshot of operating and fault data during normal or fault conditions.

Integrated Low Dropout (LDO) regulators allow the ZL8800 to be operated from a single input supply eliminating the need for additional linear regulators. The LDO output can be used to power external drivers or DrMOS devices.

With full PMBus™ compliance the ZL8800 is capable of measuring and reporting input voltage, input current, output voltage, output current as well as the device’s internal temperature, 2 external temperatures and an auxiliary voltage input.

Features

• Unique compensation-free design – always stable
• Output voltage range: 0.54V to 5.5V
• Input voltage range: 4.5V to 14V
• 1% Output Voltage accuracy over line, load and temperature
• ChargeMode control achieves fast transient response,
• reduced output capacitance and provides output stability without compensation.
• Switching frequency range 200kHz to 1.33MHz
• Proprietary single wire DDC (Digital-DC) serial bus enables
• voltage sequencing and fault spreading with other Intersil ICs
• Tracking of an external power supply
• Cycle-by-cycle inductor peak current protection
• Digital fault protection for output voltage UV/OV, input
• voltage UV/OV, temperature and MOSFET driver voltage
• 10-bit average output current measurement with adjustable
• gain settings for sensing with high current, low DCR inductors
• 10-bit monitor ADC measures input voltage, input current,
• output voltage, internal, external temperature, driver voltage
• Configurable to use stand-alone MOSFET drivers or
• integrated Driver-MOSFET (DrMOS) devices
• Nonvolatile memory for storing operating parameters and fault events.
• PMBus™ compliant

Typical applications

• Servers/storage equipment
• Telecom/datacom equipment
• Power supplies (memory, DSP, ASIC, FPGA

More information

• Datasheet
• IC product information