ISL95870AHRUZ-T Intersil, ISL95870AHRUZ-T Datasheet - Page 11

• Manufacturer Part Number: ISL95870AHRUZ-T
• Description: IC CTRLR PWM 1PHASE GPU 20UTQFN
• Manufacturer: Intersil

Specifications of ISL95870AHRUZ-T

• Applications: Controller, GPU Core Power
• Voltage - Input: 3.3 V ~ 25 V
• Number Of Outputs: 1
• Voltage - Output: 0.5 V ~ 5 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table of Contents
Applications Schematics: ISL95870 .................................................................................................... 2
Applications Schematics: ISL95870A.................................................................................................. 3
Applications Schematics: ISL95870B.................................................................................................. 4
Block Diagram .................................................................................................................................... 5
ISL95870 Functional Pin Descriptions ................................................................................................ 7
ISL95870A Functional Pin Descriptions .............................................................................................. 8
ISL95870B Functional Pin Descriptions .............................................................................................. 9
Absolute Maximum Ratings .............................................................................................................. 12
Thermal Information ........................................................................................................................ 12
Recommended Operating Conditions ................................................................................................ 12
Electrical Specifications ..................................................................................................................... 12
Theory of Operation.......................................................................................................................... 15
General Application Design Guide ..................................................................................................... 22
Revision History ............................................................................................................................... 26
Products ........................................................................................................................................... 26
L16.2.6x1.8A ..................................................................................................................................... 27
L20.3.2x1.8 ........................................................................................................................................ 28
L20.3x4.............................................................................................................................................. 29
Power-On Reset .............................................................................................................................. 15
Start-Up Timing .............................................................................................................................. 15
Start-Up and Voltage-Step Operation for ISL95870.............................................................................. 15
Start-Up and Voltage-Step Operation for ISL95870A, ISL95870B........................................................... 15
Output Voltage Programming for ISL95870......................................................................................... 16
Output Voltage Programming for ISL95870A ....................................................................................... 16
Output Voltage Programming for ISL95870B ....................................................................................... 17
High Output Voltage Programming ..................................................................................................... 19
R4 Modulator.................................................................................................................................. 19
Stability ......................................................................................................................................... 19
Transient Response ......................................................................................................................... 20
Diode Emulation.............................................................................................................................. 20
Overcurrent.................................................................................................................................... 20
Overvoltage ................................................................................................................................... 21
Undervoltage.................................................................................................................................. 21
Over-Temperature........................................................................................................................... 21
PGOOD Monitor............................................................................................................................... 22
Integrated MOSFET Gate-Drivers ....................................................................................................... 22
Adaptive Shoot-Through Protection.................................................................................................... 22
Selecting the LC Output Filter ........................................................................................................... 22
Selecting the Input Capacitor ............................................................................................................ 23
Selecting the Bootstrap Capacitor ...................................................................................................... 23
Driver Power Dissipation .................................................................................................................. 23
MOSFET Selection and Considerations ................................................................................................ 24
Layout Considerations ...................................................................................................................... 24
11
ISL95870, ISL95870A, ISL95870B
December 22, 2009
FN6899.0