ISL95870A Intersil Corporation, ISL95870A Datasheet

ISL95870A

Manufacturer Part Number

ISL95870A

Description

PWM DC/DC Controller

Manufacturer

Intersil Corporation

Datasheet

1.ISL95870A.pdf (29 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

ISL95870AHRUZ-T

Manufacturer:

INTERSIL

Quantity:

20 000

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PWM DC/DC Controller with VID Inputs for

Portable GPU Core-Voltage Regulator

ISL95870, ISL95870A, ISL95870B

The ISL95870, ISL95870A, ISL95870B ICs are

Single-Phase Synchronous-Buck PWM regulators

featuring Intersil’s proprietary R

3.3V to 25V input voltage range is ideal for systems that

run on battery or AC-adapter power sources. The

ISL95870A and ISL95870B are low-cost solutions for

applications requiring dynamically selected slew-rate

controlled output voltages. The soft-start and dynamic

setpoint slew-rates are capacitor programmed. Voltage

identification logic-inputs select four (ISL95870A,

ISL95870B) resistor-programmed setpoint reference

voltages that directly set the output voltage of the

converter between 0.5V and 1.5V, and up to 5V with a

feedback voltage divider.

Compared with R

equivalent light-load efficiency, faster transient

performance, accurately regulated frequency control and

all internal compensation. These updates, together with

integrated MOSFET drivers and schottky bootstrap diode,

allow for a high-performance regulator that is highly

compact and needs few external components. The

differential remote sensing for output voltage and

selectable switching frequency are another two new

functions. For maximum efficiency, the converter

automatically enters diode-emulation mode (DEM)

during light-load conditions such as system standby.

December 22, 2009

FN6899.0

FIGURE 1. ISL95870 APPLICATION SCHEMATIC WITH ONE OUTPUT VOLTAGE SETPOINT AND DCR CURRENT SENSE

RTN1

+5V

FB1

modulator, the R

GPIO

VCC

PVCC

SREF

GND

RTN

Technology™. The wide

modulator has

1-888-INTERSIL or 1-888-468-3774

OFS

BOOT

UGATE

PHASE

PGOOD

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

VCC

BOOT

Features

• Input Voltage Range: 3.3V to 25V

• Output Voltage Range: 0.5V to 5V

• Precision Regulation

• Optimal Transient Response

• Output Remote Sense

• Extremely Flexible Output Voltage Programmability

• Selectable 300kHz, 500kHz, 600kHz or 1MHz PWM

• Automatic Diode Emulation Mode for Highest Efficiency

• Power-Good Monitor for Soft-Start and Fault Detection

Applications*

• Mobile PC Graphical Processing Unit VCC Rail

• Mobile PC I/O Controller Hub (ICH) VCC Rail

• Mobile PC Memory Controller Hub (GMCH) VCC Rail

- Proprietary R

- ±0.5% System Accuracy Over -10°C to +100°C

- Intersil’s R

- 2-Bit VID Selects Four Independent Setpoint

- 2-Bit VID Selects Four Dependent or Three

- Simple Resistor Programming of Setpoint Voltages

Frequency in Continuous Conduction

All other trademarks mentioned are the property of their respective owners.

Voltages for ISL95870B

Independent Setpoint Voltages for ISL95870A

Intersil (and design) is a registered trademark of Intersil Americas Inc.

™ Modulator Technology

™ Frequency Control Loop

SEN

(see page 26)

3.3V TO 25V

0.5V TO 5V

OUT

RTN1

CIN

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