ISL85033IRTZ-T Intersil, ISL85033IRTZ-T Datasheet - Page 7

• Manufacturer Part Number: ISL85033IRTZ-T
• Description: IC REG BUCK ADJ DUAL 28TQFN
• Manufacturer: Intersil
• Type: Step-Down (Buck)r

Specifications of ISL85033IRTZ-T

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 28 V
• Current - Output: 3A
• Frequency - Switching: 300kHz ~ 2MHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-WFQFN exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

Table of Contents
Pin Configuration ................................................................................................................................ 2
Pin Descriptions .................................................................................................................................. 2
Typical Application Schematics............................................................................................................ 3
Functional Block Diagram .................................................................................................................... 5
Ordering Information ......................................................................................................................... 6
Absolute Maximum Ratings ................................................................................................................ 8
Thermal Information .......................................................................................................................... 8
Recommended Operating Conditions .................................................................................................. 8
Electrical Specificaitons ..................................................................................................................... 8
Typical Performance Curves ............................................................................................................. .10
Detailed Description .......................................................................................................................... 16
Operation Initialization ..................................................................................................................... 16
Output Tracking and Sequencing ....................................................................................................... 16
Protection Features ........................................................................................................................... 17
Application Guidelines ....................................................................................................................... 18
Revision History ................................................................................................................................ 24
Products ............................................................................................................................................ 24
Package Outline Drawing ................................................................................................................. 25
Power-On Reset and Undervoltage Lockout ......................................................................................... 16
Enable and Disable .......................................................................................................................... 16
Power Good.................................................................................................................................... 16
Output Voltage Selection.................................................................................................................. 16
Buck Regulator Overcurrent Protection ............................................................................................... 17
Thermal Overload Protection............................................................................................................. 18
BOOT Undervoltage Protection .......................................................................................................... 18
Operating Frequency ....................................................................................................................... 18
Synchronization Control ................................................................................................................... 18
Output Inductor Selection ................................................................................................................ 18
Buck Regulator Output Capacitor Selection ......................................................................................... 18
Current Sharing Configuration........................................................................................................... 19
Input Capacitor Selection ................................................................................................................. 19
Loop Compensation Design............................................................................................................... 19
Theory of Compensation .................................................................................................................. 20
PWM Comparator Gain Fm................................................................................................................ 20
Power Stage Transfer Functions ........................................................................................................ 20
Rectifier Selection ........................................................................................................................... 21
Power Derating Characteristics.......................................................................................................... 22
Layout Considerations...................................................................................................................... 22
7
ISL85033
ISL85033
December 8, 2010
FN6676.2