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DATASHEET

Continuous Output Current and LDOs

ISL95901

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.

Features

• Wide input voltage range from 4.5V to 16V

• Adjustable output voltages with continuous output current

up to 4A

• 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

Applications

• General purpose, point-of-load DC/DC power conversion

• Notebook, netbook and tablet

• Embedded computing system

Related Literature

4A/4A Continuous Output Current and LDOs”

FIGURE 2. R3™ vs R4™ IDEALIZED TRANSIENT RESPONSE

40

50

60

70

80

90

00

0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

OUTPUT LOAD (A)

R3

t

R4

VOUT

VCOMP

IOUT

January 22, 2015

FN7893.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

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.