ISL8270M Datasheet PDF - Intersil
| Part Number | ISL8270M | |
| Description | Digital DC/DC PMBus 25A Module | |
| Manufacturers | Intersil | |
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DATASHEET
Digital DC/DC PMBus 25A Module
ISL8270M
The ISL8270M is a 25A step-down DC/DC power supply module
with integrated digital PWM controller, synchronous power
switches, an inductor and passives. Only bulk input and output
capacitors are needed to finish the design. The 25A of
continuous output current can be delivered without a need of
airflow or a heatsink. The thermally enhanced HDA module is
capable of dissipating heat directly into the PCB.
The ISL8270M uses ChargeMode™ control architecture, which
responds to a transient load within a single switching cycle.
The ISL8270M comes with a preprogrammed configuration for
operating in a pin strap mode; output voltage, switching
frequency and device SMBus address can be programmed
with external resistors. More configuration such as soft-start
and fault limits can be easily programmed or changed via
PMBus compliant serial bus interface. PMBus can be used to
monitor voltages, current, temperatures and fault status. The
ISL8270M is supported by PowerNavigator™ software, a
graphical user interface (GUI) that can be used to configure
modules to a desired solution.
The ISL8270M is available in a 40-pin compact 17mmx19mm
HDA module with very low profile height of3.55mm, suitable
for automated assembly by standard surface mount
equipment. The ISL8270M is RoHS compliant by exemption.
Features
• Complete digital switch mode power supply
- Wide VIN range: 4.5V to 14V
- Programmable VOUT range: 0.6V to 5V
• PMBus compliant I2C communication interface
- Programmable VOUT, margining, UV/OV, IOUT limit,
soft-start/stop, sequencing, and external synchronization
- Monitor: VIN, VOUT, IOUT, temperature, duty cycle,
switching frequency and faults
• ChargeMode control architecture
• ±1.0% VOUT accuracy over line, load and temperature
• Power-Good indicator
• Over-temperature protection
• Internal nonvolatile memory and fault logging
• Patented thermally enhanced HDA package
Applications
• Server, telecom, storage, and datacom
• Industrial/ATE, and networking equipment
• General purpose power for ASIC, FPGA, DSP and memory
Related Literature
• AN1926 “ISL8270MEVAL1Z Evaluation Board User Guide”
VIN
2.2
1
CIN
10
VIN
VDD
VOUT
VSEN+
VSEN-
VDRVIN
VDRVOUT
ISL8270M
SCL
SDA
SALRT
VOUT
COUT
19mm
3.55mm
17mm
SGND
PGND
NOTE:
1. Only bulk input and output capacitors are required to finish the
design.
FIGURE 1. A COMPLETE DIGITAL SWITCH MODE POWER SUPPLY
FIGURE 2. A SMALL PACKAGE FOR HIGH POWER DENSITY
July 2, 2015
FN8635.1
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014, 2015. All Rights Reserved
Intersil (and design), PowerNavigator, ChargeMode and Digital-DC are trademarks owned by Intersil Corporation
or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners.
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ISL8270M
Pin Descriptions (Continued)
PIN LABEL
13 VSWH
14 VOUT
15, 27, 40
16
SGND
VDD
17 EN
18 SCL
19 SDA
20 SALRT
21 SA
24 MGN
25 VSET
28 PG
29 UVLO
30 PHASE
35 VR6
36 VR5
37 VDDC
38 V25
39 SYNC
4, 5, 22,
26, 32, 33
NC
TYPE
PWR
PWR
PWR
PWR
I
I
I/O
O
I
I
I
O
I
PWR
PWR
PWR
PWR
PWR
I/O
DESCRIPTION
Switch node. Refer to the “PCB Layout Guidelines” on page 20 for connecting VSWH pads to electrically isolated
PCB copper island to dissipate internal heat.
Power supply output. Range: 0.6V to 5V. Refer to “Derating Curves” on page 12 for maximum recommended
output current at various output voltages.
Controller Signal ground. Refer to the “PCB Layout Guidelines” on page 20 for the SGND pad connections.
Input supply to digital controller. Connect VDD pad to VIN supply. Refer to the “PCB Layout Guidelines” on page 20
for the decoupling capacitors placement from VDD to SGND.
External enable input. Logic high enables the module.
Serial clock input. A pull-up resistor is required for this application.
Serial data. A pull-up resistor is required for this application.
Serial alert. A pull-up resistor is required for this application.
Serial bus address select pin. Refer to Table 7 for list of resistor values to set various serial bus address.
External VOUT margin control pin. Active high (>2V) signal at this pin sets VOUT margin high, Active low (<0.8V) sets
VOUT margin low and high impedance (float) will bring VOUT back to nominal voltage. Factory default range for
margining is nominal VOUT ±5%. When using PMBus to control margin command, leave this pin as no connect.
Output voltage selection pin. Refer to Table 4 for list of resistor values to set various output voltages.
Power-Good output. Power-Good output can be open drain that requires pull-up resistor or push-pull output that
can drive a logic input.
VDD undervoltage lockout selection. Refer to Table 6 for list of resistors value to set various UVLO levels.
Switch node pad for DCR sensing. Electrically shorted inside to VSWH but for higher current sensing accuracy
connect PHASE pad to VSWH pad externally. Refer to the “PCB Layout Guidelines” on page 20.
6V Internal reference supply voltage.
5V Internal reference supply voltage.
VDD Clean. Noise at the VDD pin is filtered with ferrite bead and capacitor. For VDD > 6V, leave this pin as no
connect. For 5.5 VDD 6V, connect VDDC pin to VR6 pin. For 4.5 VDD < 5.5V, connect VDDC pin to VR6 and
VR5 pin.
2.5V Internal reference supply voltage.
SYNC pin can be input to external clock for frequency synchronization or output to supply clock signal to other
modules for synchronization. Refer to Table 5 for list of resistor values to program various switching frequencies.
These are test pins and are not electrically isolated. Leave these pins as no connect.
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July 2, 2015
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for ISL8270M electronic component. |
| Information | Total 30 Pages | |
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| Download | [ ISL8270M.PDF Datasheet ] | |
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