ISL85415

1. Overview

FN8373 Rev.5.01

Page 5 of 30

Jun.4.20

1.3

Ordering Information

1.4

Pin Configuration

1.5

Pin Descriptions

Part Number

(Notes 2, 3)

Part Marking

Temp Range (°C)

Tape and Reel

(Units) (Note 1)

Package

(RoHS Compliant)

Pkg. Dwg. #

ISL85415FRZ

5415

-40 to +125

4.5k

12 Ld DFN

L12.4x3

ISL85415FRZ-T

5415

-40 to +125

6k

12 Ld DFN

L12.4x3

ISL85415FRZ-T7A

5415

-40 to +125

250

12 Ld DFN

L12.4x3

ISL85415EVAL1Z

Buck regulator evaluation board

ISL85415EVAL2Z

Negative buck-boost evaluation board

ISL85415DEMO1Z

Buck regulator evaluation board (compact version)

ISL85415DEMO2Z

Dual output isolated buck converter demo board

Notes:

1. See TB347 for details about reel specifications.

2. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte

tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).

Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC

J STD-020.

3. For Moisture Sensitivity Level (MSL), see the ISL85415 device page. For more information about MSL, see TB363.

12 Ld 4x3 DFN

Top View

Pin Number

Pin Name

Description

1

SS

The SS pin controls the soft-start ramp time of the output. A single capacitor from the SS pin to

ground determines the output ramp rate. See “Soft Start” on page 19 for soft-start details. If the SS

pin is tied to VCC, an internal soft-start of 2ms is used.

2

SYNC

Synchronization and light load operational mode selection input. Connect to logic high or VCC for

PWM mode. Connect to logic low or ground for PFM mode. Logic ground enables the IC to

automatically choose PFM or PWM operation. Connect to an external clock source for

synchronization with positive edge trigger. Sync source must be higher than the programmed IC

frequency. There is an internal 5MΩ pull-down resistor to prevent an undefined logic state if SYNC

is left floating.

3

BOOT

Floating bootstrap supply pin for the power MOSFET gate driver. The bootstrap capacitor provides

the necessary charge to turn on the internal N-Channel MOSFET. Connect an external 100nF

capacitor from this pin to PHASE.

4

VIN

The input supply for the power stage of the regulator and the source for the internal linear bias

regulator. Place a minimum of 4.7µF ceramic capacitance from VIN to GND and close to the IC for

decoupling.

PIN NUMBER

SYMBOL

PIN DESCRIPTION