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

Applications

• Servers/storage equipment

• Telecom/datacom equipment

• Power supplies (memory, DSP, ASIC, FPGA)