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ISL85403 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 ISL85403
部品説明 2.5A Regulator
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 



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ISL85403 Datasheet, ISL85403 PDF,ピン配置, 機能
2.5A Regulator with Integrated High-Side MOSFET for
Synchronous Buck or Boost Buck Converter
ISL85403
The ISL85403 is an 36V, 2.5A synchronous buck or boost buck
controller with a high-side MOSFET and low-side driver integrated. In
buck mode, the ISL85403 supports a wide input range of 3V to 36V.
In boost-buck mode, the input range can be extended down to 2.5V
and output regulation can be maintained when VIN drops below
VOUT, enabling sensitive electronics to remain on in low input voltage
conditions.
The ISL85403 has a flexible selection of operation modes of
forced PWM mode and PFM mode. In PFM mode, the
quiescent input current is as low as 180µA (AUXVCC connected
to VOUT). The load boundary between PFM and PWM can be
programmed to cover wide applications.
The low-side driver can be either used to drive an external low-side
MOSFET for a synchronous buck, or left unused for a standard
non-synchronous buck. The low-side driver can also be used to
drive a boost converter as a pre-regulator followed by a buck
controlled by the same IC, which greatly expands the operating
input voltage range down to 2.5V or lower (Refer to “Typical
Application Schematic III - Boost Buck Converter” on page 6).
The ISL85403 offers the most robust current protections. It uses
peak current mode control with cycle-by-cycle current limiting.
It is implemented with frequency foldback under current limit
condition; besides that, the hiccup overcurrent mode is also
implemented to guarantee reliable operations under harsh
short conditions.
The ISL85403 has comprehensive protections against various
faults including overvoltage and over-temperature protections,
etc.
Features
• Buck mode: input voltage range 3V to 36V (refer to “Input
Voltage” on page 15 for more details)
• Boost mode expands operating input voltage lower than
2.5V (refer to “Input Voltage” on page 15 for more details)
• Selectable forced PWM mode or PFM mode
• 300µA IC quiescent current (PFM, no load); 180µA input
quiescent current (PFM, no load, VOUT tied to AUXVCC)
• Less than 5µA (MAX) shutdown input current (IC disabled)
• Operational topologies
- Synchronous buck
- Non-synchronous buck
- Two-stage boost buck
- Non-inverting single inductor buck boost
• Programmable frequency from 200kHz to 2.2MHz and
frequency synchronization capability
±1% tight voltage regulation accuracy
• Reliable overcurrent protection
- Temperature compensated current sense
- Cycle-by-cycle current limiting with frequency foldback
- Hiccup mode for worst case short condition
• 20 Ld 4x4 QFN package
• Pb-free (RoHS compliant)
Applications
• General purpose
• 24V bus power
• Battery power
Point of load
• Embedded processor and I/O supplies
PGOOD
EN
MODE
VIN
SYNC
AUXVCC
ISL85403
VCC
ISL85403
ILIMIT
SS
BOOT
PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
FIGURE 1. TYPICAL APPLICATION
March 12, 2014
FN8631.0
1
VOUT
100
95 6V VIN
90
85 12V VIN
80
75 36V VIN
70 24V VIN
65
60
55
50
0.1m
1m
10m
100m
1.0
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
VOUT 5V, TA = +25°C
2.5
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014. 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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