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Wide VIN Dual Integrated Buck Regulator With 4A/4A
Continuous Output Current and LDOs
The ISL95901 is a dual, high-efficient buck regulator capable
of 4A per channel continuous output current. It integrates two
LDOs and one low-impedance switch. This power management
IC delivers power in portable and embedded systems. With an
input range of 4.5V to 16V, it provides a high frequency power
solution for a variety of point-of-load applications. Outputs are
adjustable to meet system needs.
A PWM controller drives two pairs of internal switching
N-channel power MOSFETs to generate output voltage. The
integrated power switch is optimized for excellent thermal
performance for up to 4A of output current per channel.
The ISL95901 modulator features Intersil R4™ Technology,
which combines the best features of fixed-frequency and
hysteretic PWMs while eliminating many of their drawbacks.
Like R3™ Technology, the R4™ Technology allows variable
frequency in response to load transients and maintains the
benefits of current-mode hysteretic controllers. In addition, it
reduces regulator output impedance and uses accurate
referencing to eliminate the need for a high-gain voltage
amplifier. The resulting topology can be tuned to voltage-mode
hysteretic transient speed while maintaining a linear control
model. This topology removes the need for compensation,
which greatly simplifies regulator design for customers and
reduces external component count and cost.
Protection features include overcorrect, negative overcorrect,
UVLO and thermal overload. The ISL95901 is available in a
46 Ld 5mmx6mm Quad Flat (QFN) Pb-free package.
• Wide input voltage range from 4.5V to 16V
• Adjustable output voltages with continuous output current
up to 4A
• 1% accuracy over temperature and VCC range
• Built-in low-power LDO for external µC
• Built-in compensation
• Internally set SS and OCP
• Independent enable, power-good and standby control inputs
for each output
• Innovative R4™ Modulator
• Boot undervoltage detection
• General purpose, point-of-load DC/DC power conversion
• Notebook, netbook and tablet
• Embedded computing system
• See AN1743 “Wide VIN Dual Integrated Buck Regulator With
4A/4A Continuous Output Current and LDOs”
70 6VIN PWM
60 12VIN PWM
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 1. EFFICIENCY vs LOAD, VIN = 12V, TA = +25°C
fSW = 300kHz, VOUT = 5V
FIGURE 2. R3™ vs R4™ IDEALIZED TRANSIENT RESPONSE
January 22, 2015
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 2013, 2015. All Rights Reserved
Intersil (and design) and R3 and R4 technologies are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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Dual Integrated Buck Regulator
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