1

DATASHEET

Synchronous Step-down PWM Controller

ISL8117

The ISL8117 is a synchronous buck controller to generate POL

voltage rails and bias voltage rails for a wide variety of

applications in industrial and general purpose segments. Its

wide input and output voltage ranges make it suitable for

telecommunication and after-market automotive applications.

The ISL8117 uses the valley current modulation technique to

bring hassle-free power supply design with minimal number of

components and complete protection from unwanted events.

The ISL8117 offers programmable soft-start and enable

functions along with a power-good indicator for ease of supply

rail sequencing and other housekeeping requirements. In ideal

situations, a complete power supply circuit can be designed

with 10 external components and provide OV/OC/OT

protections in a space conscious 16 Ld 4mmx4mm QFN or

easy to assemble 6.4mmx5mm 16 Ld HTSSOP package. Both

packages use an EPAD to improve thermal dissipation and

noise immunity. Low pin count, less number of external

components and default internal values, makes the ISL8117

an ideal solution for quick to market simple power supply

designs. The ISL8117 utilizes internal loop compensation and

single resistor settings for other functions such as operating

frequency and overcurrent protection. Its current mode control

even with fixed internal compensations. The unique

DEM/Skipping mode at light-load dramatically lowers standby

power consumption with consistent output ripple over different

load levels.

Related Literature

• UG020, “ISL8117EVAL2Z Evaluation Board User Guide”

• UG021, “ISL8117DEMO2Z Demonstration Board User Guide”

• UG030, “ISL8117EVAL1Z Evaluation Board User Guide”

• UG031, “ISL8117DEMO1Z Demonstration Board User Guide”

Features

• Wide input voltage range: 4.5V to 60V

• Wide output voltage range: 0.6V to 54V

• Light-load efficiency enhancement

- Low ripple diode emulation mode with pulse skipping

•Programmable soft-start

• Supports prebiased output with SR soft-start

• Programmable frequency: 100kHz to 2MHz

•External sync

•PGOOD indicator

•Forced PWM

• Adaptive shoot-through protection

• No external current sense resistor

• Complete protection

- Overcurrent, overvoltage, over-temperature, undervoltage

• Pb-free (RoHS compliant)

Applications

• PLC and factory automation

•Amusement machines

•Security surveillance

• Server and data centers

•Switcher and routers

• Telecom and datacom

•LED panels

FIGURE 1. TYPICAL APPLICATION

FIGURE 2. EFFICIENCY

VIN

VOUT

ISEN

PGOOD

CLKOUT

SS/TRK

RT

EN

PHASE

LGATE

OCS

VCC5V

UGATE

BOOT

VIN

EXTBIAS

16

1

2

3

4

5

6

7

10

11

12

13

14

15

MOD

SYNC

SGND

FB

8

PGND 9

84

86

88

90

92

94

96

98

100

02468

10

12

14

16

OUTPUT CURRENT (A)

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

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

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.

June 4, 2015

FN8666.3