DATASHEET
ISL8280M
R16DS0012EU0200
Rev.2.00
10A High Efficiency Hybrid Digital Step-Down Power Module
Feb 15, 2019
The ISL8280M is a PMBus enabled DC/DC single
Features
channel step-down power supply featuring the
Proprietary Renesas R4 Technology
proprietary Renesas R4 Technology. The module
Linear control loop for optimal transient response
supports a wide 4.5V to 16.5V input voltage range and a
wide 0.5V to 5V output range capable of delivering up to
Variable frequency and duty cycle control during
10A of continuous current. The ISL8280M achieves up
load transient for fastest possible response
to 95% conversion efficiency and is optimized for high
Inherent voltage feed-forward for wide range
power density. Integrated LDOs provide module bias
input
voltage allowing for single supply operation. The
2
ISL8280M includes a SMBus/PMBus/I C interface for Input voltage range: 4.5V to 16.5V
device configuration, telemetry (V , V , I , and
IN OUT OUT
Output voltage range: 0.5V to 5V
temperature), and fault reporting.
1.5% load/line/temperature regulation with remote
The proprietary Renesas R4 control scheme has extremely
sense
fast transient performance, accurately regulated
Supports all ceramic solutions
frequency control, and all internal compensation. An
efficiency enhancing PFM mode greatly improves
Integrated LDOs for single input rail solution
light-load efficiency. The ISL8280Ms serial bus allows
2
SMBus/PMBus/I C compatible up to 1.25MHz
for easy R4 loop optimization that results in fast transient
performance across a wide range of applications
256 boot-up voltage levels with a configuration pin
including all ceramic output filters.
Seven switching frequency options from 300kHz to
The ISL8280M has four 8-bit configuration pins that
1MHz
provide very flexible configuration options (such as
PFM operation option for improved light-load
frequency, V , and AV gain) without the need for
OUT
efficiency
built-in NVM memory. As a result, the design flow
Startup into precharged load
closely matches traditional analog modules while still
offering the design flexibility and feature set of a digital
Power-good monitor for soft-start and fault detection
2
SMBus/PMBus/I C interface. The ISL8280M features
Comprehensive fault protection for high system
remote voltage sensing, completely eliminates any
reliability
potential difference between remote and local ground,
and improves regulation and protection accuracy. A
Over-temperature protection
precision enable input coordinates the startup of the
Output overcurrent and short-circuit protection
ISL8280M with other voltage rails and is especially
useful for power sequencing. Output overvoltage and undervoltage protection
The ISL8280M integrates all power and most passive Open remote sense protection
components to minimize the external components and
Input UVLO and power sequence, fault reset
significantly reduce design complexity and board space.
Compatible with Renesas PowerNavigator
The ISL8280M is available in a low-profile, thermally
software
enhanced, compact 12mmx11mmx5.3mm fully
encapsulated HDA package.
Thermally enhanced 12mmx11mmx5.3mm HDA
package
Applications
Servers, telecom, storage, and datacom Related Literature
For a full list of related documents, visit our website:
Industrial/ATE and networking equipment
ISL8280M device page
Graphics cards
General purpose power for ASIC, FPGA, DSP, and
memory
R16DS0012EU0200 Rev.2.00 Page 1 of 51
Feb 15, 2019ISL8280M
Contents
1. Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Typical Application Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Pin Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Functional Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2. Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.3 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.4 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1 Efficiency Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Output Voltage Ripple . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3 Load Transient Response Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.4 Startup and Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.5 Derating Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.1 Configuring Internal Bias and LDO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.2 Enabling and Disabling the ISL8280M. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3 Programming the Resistor Reader . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4 Soft-Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5 Boot-Up Voltage Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
4.6 Thermal Monitoring and Compensation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.7 Fault Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
4.8 PGOOD Monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
4.9 PFM Mode Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
2
4.10 SMBus, PMBus, and I C Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5. Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6. Thermal Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
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Feb 15, 2019