Intel(Intersil) ISL6269B User's Manual

ISL6269B

May 30, 2007 FN6280.2Data Sheet

High-Performance Notebook PWM Features Controller with Audio-Frequency Clamp

High performance R3 technology

The ISL6269B IC is a Single-Phase Synchronous-Buck

Fast transient response

PWM controller featuring Intersil's Robust Ripple Regulator

(R3) technology that delivers truly superior dynamic ±1% regulation accuracy: -10°C to +100°C and -40° to +100°C

response to input voltage and output load transients. Integrated MOSFET drivers and bootstrap diode result in Wide input voltage range: +5.0V to +25.0V fewer components and smaller implementation area.

Output voltage range: +0.6V to +3.3V

Intersil’s R3 technology combines the best features of fixed-

Wide output load range: 0A to 25A

frequency PWM and hysteretic PWM while eliminating many

of their shortcomings. R3 technology employs an innovative Selectable diode emulation mode for increased light load modulator that synthesizes an AC ripple voltage signal VR, efficiency

analogous to the output inductor ripple current. The AC signal

Programmable PWM frequency: 200k Hz to 600k Hz

VR enters a window comparator where the lower threshold is

Pre-biased output start-up capability

the error amplifier output VCOMP, and the upper threshold is a programmable voltage reference VW, resulting in generation Integrated MOSFET drivers and bootstrap diode of the PWM signal. The voltage reference VW sets the steady-

Internal digital soft-start

state PWM frequency. Both edges of the PWM can be

modulated in response to input voltage transients and output Power good monitor

load transients, much faster than conventional fixed-

PWM minimum frequency above audible spectrum

frequency PWM controllers. Unlike a conventional hysteretic

Fault protection

converter, the ISL6269B has an error amplifier that provides

±1% voltage regulation at the FB pin. Undervoltage protection Soft crowbar overvoltage protection

The ISL6269B has a 1.5ms digital soft-start and can be

Low-side MOSFET r DS(ON) overcurrent protection

started into a pre-biased output voltage. A resistor divider is

Over-temperature protection

used to program the output voltage setpoint. The ISL6269B

Fault identification by PGOOD pull down resistance

can be configured to operate in continuous-conduction- mode (CCM) or diode-emulation-mode (DEM), which Pb-free plus anneal available (Ro HS compliant) improves light-load efficiency. In CCM the controller always

operates as a synchronous rectifier however, when DEM is Applications

enabled the low-side MOSFET is permitted to stay off,

PCI express graphical processing unit

blocking negative current flow into the low-side MOSFET

from the output inductor. Auxiliary power rail VRM

Pinout

Network adapter

ISL6269B (16 LD 4x4 QFN)

Ordering Information

TOP VIEW

TEMP PART NUMBER PART RANGE PACKAGE PKG. (Note) MARKING (°C) (Pb-free) DWG. #

ISL6269BCRZ* 62 69BCRZ -10 to +100 16 Ld 4x4 QFN L16.4x4

VIN PVCC

ISL6269BIRZ* 62 69BIRZ -40 to +100 16 Ld 4x4 QFN L16.4x4

VCC LG *Add “-T” suffix for tape and reel.

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

FCCM PGND

material sets; molding compounds/die attach materials and 100% ISEN matte tin plate termination finish, which are Ro HS compliant and

compatible with both Sn Pb and Pb-free soldering operations. Intersil 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.

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 registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006, 2007. All Rights Reserved All other trademarks mentioned are the property of their respective owners.