ISL95876HRZ-T 查看數據表（PDF） - Intersil
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ISL95876HRZ-T Datasheet PDF : 29 Pages
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PWM DC/DC Controller with VID Inputs for Portable
GPU Core-Voltage Regulator
ISL95874, ISL95875, ISL95876
The ISL95874, ISL95875, ISL95876 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 ISL95875 and ISL95876 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 (ISL95875, ISL95876)
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
ISL95875 and ISL95876
- 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
• Mobile PC Graphical Processing Unit VCC Rail
• Mobile PC I/O Controller Hub (ICH) VCC Rail
• Mobile PC Memory Controller Hub (GMCH) VCC Rail
RVCC
+5V
CPVCC
CVCC
RTN1 RFB1
GPIO
1
GND
2 RTN
3 EN
4
SREF
BOOT 12
UGATE 11
PHASE 10
9
PGOOD
CBOOT
QHS
QLS
LO
CSEN
VIN
3.3V TO 25V
CIN
VOUT
0.5V TO 3.3V
CO
RTN1
RO
RFB
0
ROFS
FIGURE 1. ISL95874 APPLICATION SCHEMATIC WITH ONE OUTPUT VOLTAGE SETPOINT AND DCR CURRENT SENSE
October 21, 2011
1
FN7933.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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