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ISL78225 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 ISL78225
部品説明 4-Phase Interleaved Boost PWM Controller
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 



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ISL78225 Datasheet, ISL78225 PDF,ピン配置, 機能
DATASHEET
4-Phase Interleaved Boost PWM Controller with Light
Load Efficiency Enhancement
ISL78225
The ISL78225 4-phase controller is targeted for applications
where high efficiency (>95%) and high power are required. The
multiphase boost converter architecture uses interleaved timing
to multiply channel ripple frequency and reduce input and output
ripple. Lower ripple results in fewer input/output capacitors and
therefore lower component cost and smaller implementation
area.
The ISL78225 has a dedicated pin to initiate the phase dropping
scheme for higher efficiency at light load by dropping phases
based on the load current, so the switching and core losses in the
converter are reduced significantly. As the load increases, the
dropped phase(s) are added back to accommodate heavy load
transients and improve efficiency.
Input current is sensed continuously by measuring the voltage
across a dedicated current sense resistor or inductor DCR. This
current sensing provides precision channel-current balancing,
and per-phase overcurrent protection. A separate totalizing
current limit function provides overcurrent protection for all the
phases combined. This two-stage current protection provides
maximum performance and circuit reliability.
The ISL78225 can also provide for input voltage tracking via the
VREF2 pin. The comparison reference voltage will be the lower of
the VREF2 pin or the internal 2V reference. By using a resistor
network between VIN and VREF2 pin, the output voltage can track
input voltage to limit the output power during automotive cranking
conditions.
The ISL78225 can output a clock signal for expanding operation to
8 phases, which offers high system flexibility. The
threshold-sensitive enable input is available to accurately
coordinate the start-up of the ISL78225 with any other voltage rail.
Features
• Peak current mode PWM control with adjustable slope
compensation
• Precision resistor/DCR current sensing
• 2-, 3- or 4-phase operation
• Adjustable phase dropping/diode emulation/pulse skipping
for high efficiency at light load
• Phase dropping facilitated with companion FET driver
ISL78420 (featuring tri-level input control)
• Adjustable switching frequency or external synchronization
from 75kHz up to 1MHz per phase
• Over-temperature/overvoltage protection
• 2V 1.0% internal reference
• Pb-free 44 Ld 10x10 EP-TQFP (RoHS compliant)
• -40°C to +125°C operating temperature range
• AEC-Q100 qualified
Applications
• Automotive power supplies
- Start/stop DC/DC converter
- Electronic power steering systems (EPAS)
- Fuel pumps
- Injection system
• Audio trunk amplifier power supplies
• Telecom and industrial power supplies
0.98
WITH PHASE DROPPING
0.93
WITHOUT PHASE DROPPING
0.88
0.83
0.78
16V INPUT, 36V OUTPUT
SYNCHRONOUS BOOST
0.73
0 1 2 3 4 5 6 7 8 9 10
OUTPUT CURRENT (A)
FIGURE 1. EFFICIENCY vs OUTPUT CURRENT vs PHASE DROPPING MODE
September 5, 2014
FN7909.4
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 LLC 2011, 2013, 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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