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ISL95901
FN7893
Rev 1.00
January 22, 2015
Wide V Dual Integrated Buck Regulator With 4A/4A Continuous Output Current
IN
and LDOs
The ISL95901 is a dual, high-efficient buck regulator capable
Features
of 4A per channel continuous output current. It integrates two
• Wide input voltage range from 4.5V to 16V
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.
• Adjustable output voltages with continuous output current
up to 4A
• 1% accuracy over temperature and V range
CC
• Built-in low-power LDO for external µC
• Built-in compensation
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.
• Internally set SS and OCP
• Independent enable, power-good and standby control inputs
for each output
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.
• Innovative R4™ Modulator
• Boot undervoltage detection
Applications
• General purpose, point-of-load DC/DC power conversion
• Notebook, netbook and tablet
• Embedded computing system
Related Literature
• See AN1743 “Wide V Dual Integrated Buck Regulator With
IN
4A/4A Continuous Output Current and LDOs”
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.
00
90
I
OUT
12V PFM
IN
6V PFM
IN
80
70
60
50
40
R4
8.4V PFM
IN
R3
6V PWM
IN
V
COMP
8.4V PWM
IN
f
= 300kHz, V = 5V
OUT
SW
12V PWM
IN
V
OUT
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
t
FIGURE 1. EFFICIENCY vs LOAD, V = 12V, T = +25°C
IN
FIGURE 2. R3™ vs R4™ IDEALIZED TRANSIENT RESPONSE
A
FN7893 Rev 1.00
January 22, 2015
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