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)