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ISL95876

更新时间： 2024-11-06 02:57:35
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瑞萨 - RENESAS /
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29页 1281K
描述
PWM DC/DC Controllers with VID Inputs for Portable GPU Core-Voltage Regulator

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ISL95876 数据手册

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DATASHEET  
ISL95874, ISL95875, ISL95876  
PWM DC/DC Controllers with VID Inputs for Portable GPU Core-Voltage  
Regulator  
FN7933  
Rev 1.00  
March 2, 2012  
The ISL95874, ISL95875, ISL95876 ICs are Single-Phase  
Features  
Synchronous-Buck PWM regulators featuring Intersil’s  
4
• Input Voltage Range: 3.3V to 25V  
proprietary R 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.  
• Output Voltage Range: 0.5V to 5V  
• Precision Regulation  
4
- Proprietary R ™ Frequency Control Loop  
- ±0.5% System Accuracy Over -10°C to +100°C  
• Optimal Transient Response  
4
- Intersil’s R ™ Modulator Technology  
• Output Remote Sense  
3
4
Compared with R modulator, the R 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.  
• 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  
R
VCC  
+5V  
C
VCC  
C
PVCC  
V
IN  
3.3V TO 25V  
CIN  
Q
HS  
1
12  
11  
10  
9
GND  
RTN  
BOOT  
R
FB1  
RTN1  
2
V
UGATE  
PHASE  
PGOOD  
L
OUT  
O
0.5V TO 3.3V  
3
4
EN  
GPIO  
Q
LS  
CO  
SREF  
C
SEN  
RTN1  
C
BOOT  
R
O
0
R
FB  
R
OFS  
FIGURE 1. ISL95874 APPLICATION SCHEMATIC WITH ONE OUTPUT VOLTAGE SETPOINT AND DCR CURRENT SENSE  
FN7933 Rev 1.00  
March 2, 2012  
Page 1 of 29  
1234567...29

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