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ISL62875 데이터시트 PDF




Intersil에서 제조한 전자 부품 ISL62875은 전자 산업 및 응용 분야에서
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PDF 형식의 ISL62875 자료 제공

부품번호 ISL62875 기능
기능 PWM DC/DC Controller
제조업체 Intersil
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ISL62875 데이터시트, 핀배열, 회로
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PWM DC/DC Controller with VID Inputs for
Portable GPU Core-Voltage Regulator
ISL62875
The ISL62875 is a Single-Phase Synchronous-Buck
PWM voltage regulator featuring Intersil’s Robust Ripple
Regulator (R3) Technology™. The wide 3.3V to 25V
input voltage range is ideal for systems that run on
battery or AC-adapter power sources. The ISL62875 is a
low-cost solution 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 resistor-programmed setpoint reference voltages
that directly set the output voltage of the converter
between 0.5V to 1.5V, and up to 3.3V using a feedback
voltage divider. Robust integrated MOSFET drivers and
Schottky bootstrap diode reduce the implementation
area and component cost.
Intersil’s R3 Technology™ combines the best features of
both fixed-frequency and hysteretic PWM control. The
PWM frequency is 500kHz during static operation,
becoming variable during changes in load, setpoint
voltage, and input voltage when changing between
battery and AC-adapter power. The modulators ability to
change the PWM switching frequency during these
events in conjunction with external loop compensation
produces superior transient response. 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 3.3V
• Output Load up to 30A
• Extremely Flexible Output Voltage Programmability
- 2-Bit VID Selects Four Independent Setpoint
Voltages
- Simple Resistor Programming of Setpoint Voltages
- Accepts External Setpoint Reference such as DAC
• ±0.75% System Accuracy: -10°C to +100°C
• Fixed 500kHz PWM Frequency in Continuous
Conduction
• Integrated High-current MOSFET Drivers and
Schottky Boot-Strap Diode for Optimal Efficiency
Applications*(see page 21)
• Mobile PC GPU Core Power
• Mobile PC I/O Controller Hub (ICH) VCC Rail
• Tablet PCs/Slates and Netbooks
• Hand-Held Portable Instruments
Related Literature*(see page 21)
• TB389 “PCB Land Pattern Design and Surface Mount
Guidelines for QFN Packages”
Typical Application
+5V
GPIO
CPVCC
1
2
PGND
3
GND
4
EN
5 VID1
6 VID0
7 SREF
8 SET0
9 SET1
20
19
VCC
18
BOOT
17
UGATE
PHASE 16
14
OCSET
13
VO
12
FB
10 11 VCC
RSET1 RSET2 RSET3
GPIO
CVCC
QHS
CBOOT
QLS
VIN
3.3V TO 25V
CIN
LO
COCSET
VOUT
0.5V TO 3.3V
COUT
RCOMP
CCOMP
RO
RFB
FN6905.1
September 18, 2009
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 trademark of Intersil Americas LLC
Copyright Intersil Americas LLC 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.




ISL62875 pdf, 반도체, 판매, 대치품
Block Diagram
FB
SREF
SET0
SET1
SET2
VID1
VID0
GND
EN VCC
POR
100k
EA
VCOMP
100pF
VSET
SW0
SW1
SW2
SW3
FAULT
RUN
H
L
VW IN
PWM
RUN
DRIVER
OTP
SHOOT-THROUGH
PROTECTION
PWM RUN DRIVER
gmVIN
VCC
Cr
VR
gmVO
VID DECODER
INT
500mV
EXT
SW4
VREF
FB
UVP
FAULT
OCP
FIGURE 4. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL62875
IOCSET
10µA
BOOT
UGATE
PHASE
PVCC
LGATE
PGND
VO
OCSET
PGOOD

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ISL62875 전자부품, 판매, 대치품
ISL62875
Table of Contents
Application Schematics ....................................................................................................................... 2
Block Diagram .................................................................................................................................... 4
Pin Configuration ................................................................................................................................ 5
ISL62875 Functional Pin Descriptions ................................................................................................ 5
Ordering Information ......................................................................................................................... 6
Absolute Maximum Ratings ................................................................................................................ 8
Thermal Information .......................................................................................................................... 8
Recommended Operating Conditions .................................................................................................. 8
Electrical Specifications ...................................................................................................................... 8
Theory of Operation .......................................................................................................................... 11
Modulator ...................................................................................................................................... 11
Synchronous Rectification ................................................................................................................. 11
Diode Emulation .............................................................................................................................. 11
Power-On Reset .............................................................................................................................. 12
VIN and PVCC Voltage Sequence ....................................................................................................... 12
Start-Up Timing .............................................................................................................................. 12
PGOOD Monitor ............................................................................................................................... 12
LGATE and UGATE MOSFET Gate-Drivers ............................................................................................ 12
Adaptive Shoot-Through Protection .................................................................................................... 12
Setpoint Reference Voltage Programming ........................................................................................ 13
Calculating Setpoint Voltage Programming Resistor Values .................................................................... 13
External Setpoint Reference .............................................................................................................. 14
Soft-Start and Voltage-Step Delay .................................................................................................... 14
Circuit Description ........................................................................................................................... 14
Component Selection For CSOFT Capacitor .......................................................................................... 15
Compensation Design ....................................................................................................................... 15
Fault Protection ................................................................................................................................ 15
Overcurrent .................................................................................................................................... 15
Component Selection for ROCSET and CSEN ......................................................................................... 16
Overvoltage .................................................................................................................................... 16
Undervoltage .................................................................................................................................. 16
Over-Temperature ........................................................................................................................... 16
General Application Design Guide ..................................................................................................... 16
Selecting the LC Output Filter ........................................................................................................... 17
Selection of the Input Capacitor ........................................................................................................ 17
Selecting The Bootstrap Capacitor ..................................................................................................... 17
Driver Power Dissipation .................................................................................................................. 18
MOSFET Selection and Considerations ................................................................................................ 18
PCB Layout Considerations ............................................................................................................... 19
Power and Signal Layers Placement on the PCB ................................................................................... 19
Component Placement ..................................................................................................................... 19
Signal Ground and Power Ground ...................................................................................................... 19
Routing and Connection Details ......................................................................................................... 19
Copper Size for the Phase Node ........................................................................................................ 20
Revision History ............................................................................................................................... 21
Products ........................................................................................................................................... 21
Package Outline Drawing ................................................................................................................. 22
7 September 18, 2009
FN6905.1

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