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PDF ISL95870A Data sheet ( Hoja de datos )
| Número de pieza | ISL95870A | |
| Descripción | PWM DC/DC Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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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 R4 Technology™. The wide
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 R3 modulator, the R4 modulator has
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.
Features
• Input Voltage Range: 3.3V to 25V
• Output Voltage Range: 0.5V to 5V
• Precision Regulation
- Proprietary R4™ Frequency Control Loop
- ±0.5% System Accuracy Over -10°C to +100°C
• Optimal Transient Response
- Intersil’s R4™ Modulator Technology
• Output Remote Sense
• Extremely Flexible Output Voltage Programmability
- 2-Bit VID Selects Four Independent Setpoint
Voltages for ISL95870B
- 2-Bit VID Selects Four Dependent or Three
Independent Setpoint Voltages for ISL95870A
- Simple Resistor Programming of Setpoint Voltages
• Selectable 300kHz, 500kHz, 600kHz or 1MHz PWM
Frequency in Continuous Conduction
• Automatic Diode Emulation Mode for Highest Efficiency
• Power-Good Monitor for Soft-Start and Fault Detection
Applications*(see page 26)
• Mobile PC Graphical Processing Unit VCC Rail
• Mobile PC I/O Controller Hub (ICH) VCC Rail
• Mobile PC Memory Controller Hub (GMCH) VCC Rail
www.DataSheet4U.com
+5V
RVCC
CPVCC
CVCC
VIN
3.3V TO 25V
CIN
RTN1 RFB1
GPIO
1
GND
2 RTN
3 EN
4
SREF
BOOT
UGATE
PHASE
PGOOD
12
11
10
9
CBOOT
QHS
QLS
LO
CSEN
VOUT
0.5V TO 5V
CO
RTN1
RO
ROFS
RFB
0
FIGURE 1. ISL95870 APPLICATION SCHEMATIC WITH ONE OUTPUT VOLTAGE SETPOINT AND DCR CURRENT SENSE
December 22, 2009
FN6899.0
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
Block Diagram
VCC
EN
PGOOD
FB
SREF
POR
SOFT-START
CIRCUITRY
PGOOD
CIRCUITRY
INTERNAL
COMPENSATION
AMPLIFIER
+
OVERVOLTAGE/
UNDERVOLTAGE
DRIVER
DEAD-TIME
GENERATION
DRIVER
*SET 0
*SET 1
**SET2
*VID1
*VID0
GND
REFERENCE
VOLTAGE
CIRCUITRY
R4
MODULATOR
REMOTE SENSE
CIRCUITRY
Fs SELECTION
CIRCUITRY
OVERCURRENT
*ISL95870A, ISL95870B ONLY
RTN
FSEL
**ISL95870B ONLY
FIGURE 8. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL95870, ISL95870A, ISL95870B
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
VO
OCSET
5 Page 
ISL95870, ISL95870A, ISL95870B
Table of Contents
Applications Schematics: ISL95870 .................................................................................................... 2
Applications Schematics: ISL95870A.................................................................................................. 3
Applications Schematics: ISL95870B.................................................................................................. 4
Block Diagram .................................................................................................................................... 5
ISL95870 Functional Pin Descriptions ................................................................................................ 7
ISL95870A Functional Pin Descriptions .............................................................................................. 8
ISL95870B Functional Pin Descriptions .............................................................................................. 9
Absolute Maximum Ratings .............................................................................................................. 12
Thermal Information ........................................................................................................................ 12
Recommended Operating Conditions ................................................................................................ 12
Electrical Specifications ..................................................................................................................... 12
Theory of Operation.......................................................................................................................... 15
Power-On Reset .............................................................................................................................. 15
Start-Up Timing .............................................................................................................................. 15
Start-Up and Voltage-Step Operation for ISL95870.............................................................................. 15
Start-Up and Voltage-Step Operation for ISL95870A, ISL95870B........................................................... 15
Output Voltage Programming for ISL95870......................................................................................... 16
Output Voltage Programming for ISL95870A ....................................................................................... 16
Output Voltage Programming for ISL95870B ....................................................................................... 17
High Output Voltage Programming ..................................................................................................... 19
R4 Modulator.................................................................................................................................. 19
Stability ......................................................................................................................................... 19
Transient Response ......................................................................................................................... 20
Diode Emulation.............................................................................................................................. 20
Overcurrent.................................................................................................................................... 20
Overvoltage ................................................................................................................................... 21
Undervoltage.................................................................................................................................. 21
Over-Temperature........................................................................................................................... 21
PGOOD Monitor............................................................................................................................... 22
www.DatIanStheegert4aUt.ecdomMOSFET Gate-Drivers ....................................................................................................... 22
Adaptive Shoot-Through Protection.................................................................................................... 22
General Application Design Guide ..................................................................................................... 22
Selecting the LC Output Filter ........................................................................................................... 22
Selecting the Input Capacitor ............................................................................................................ 23
Selecting the Bootstrap Capacitor ...................................................................................................... 23
Driver Power Dissipation .................................................................................................................. 23
MOSFET Selection and Considerations ................................................................................................ 24
Layout Considerations ...................................................................................................................... 24
Revision History ............................................................................................................................... 26
Products ........................................................................................................................................... 26
L16.2.6x1.8A ..................................................................................................................................... 27
L20.3.2x1.8 ........................................................................................................................................ 28
L20.3x4.............................................................................................................................................. 29
11 FN6899.0
December 22, 2009
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet ISL95870A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
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| ISL95870B | PWM DC/DC Controller | Intersil Corporation |
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