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ISL95873 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 ISL95873
部品説明 Buck PWM Controller
メーカ Intersil
ロゴ Intersil ロゴ 



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ISL95873 Datasheet, ISL95873 PDF,ピン配置, 機能
Buck PWM Controller with Internal Compensation and
External Reference Tracking
ISL95873
The ISL95873 is a Single-Phase Synchronous-Buck PWM
controller featuring Intersil’s proprietary R4™ Technology. The
R4™ modulator has integrated compensation, fast transient
performance, accurate switching frequency control, and
excellent light-load efficiency. These technology advances,
together with integrated MOSFET drivers and a Schottky
bootstrap diode, allow for a high performance regulator that is
highly compact and needs few external components.
Differential remote sensing of the output voltage is an
additional feature. For maximum efficiency, the converter
automatically enters diode-emulation mode (DEM) during
light-load conditions, such as system standby.
The ISL95873 accepts a wide 3.3V to 25V input voltage range,
making it ideal for systems that run on battery or AC-adapter
power sources. It also is a low-cost solution for applications
requiring tracking of an external reference voltage during
soft-start. When the external reference level meets the internal
reference voltage, the ISL95873 switches from the external
reference to the internal reference. The external reference is
only used during soft-start.
Features
• External reference tracking
• Intersil’s R4™ modulator technology
- Internal compensation
- Fast, optimal transient response
• Input voltage range: 3.3V to 25V
• Output voltage range: 0.5V to 3.3V
• Precision voltage regulation
- ±0.5% System accuracy over -10°C to +100°C
• Output voltage remote sense
• Fixed 300kHz PWM frequency in continuous conduction
- Proprietary frequency control loop
• Automatic diode emulation mode for highest efficiency
• Power-good monitor for soft-start and fault detection
Applications
• Compact buck regulators requiring external tracking
RVCC
+5V
CPVCC
CVCC
RTN1 RFB1
EXTERNAL
REFERENCE
VOLTAGE
GPIO
1
GND
2 RTN
3 EN
4
REFIN
BOOT
UGATE
PHASE
PGOOD
12
11
10
9
CBOOT
QHS
QLS
LO
CSEN
RO
ROFS
RFB
FIGURE 1. ISL95873 APPLICATION SCHEMATIC WITH DCR CURRENT SENSE
VIN
3.3V TO 25V
CIN
VOUT
0.5V TO 3.3V
CO
RTN1
0
December 10, 2012
FN8390.0
1 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. 2012. All Rights Reserved.
R3 , R4 Modulator Technologies and Intersil (and design) are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the propertyForefethDeaitrarsehsepeet chttitvpe://owwwnwe.drsa.tasheet4u.com/

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