ISL6269AIRZ-T Datasheet, PDF (1/14 Pages) Intersil Corporation – High-Performance Notebook PWM Controller

ISL6269A
®
Data Sheet
May 30, 2007
FN9253.2
High-Performance Notebook PWM
Controller
The ISL6269A IC is a Single-Phase Synchronous-Buck
PWM controller featuring Intersil's Robust Ripple Regulator
(R³) technology that delivers truly superior dynamic
response to input voltage and output load transients.
Integrated MOSFET drivers and bootstrap diode result in
fewer components and smaller implementation area.
Intersil’s R³ technology combines the best features of fixed-
frequency PWM and hysteretic PWM while eliminating many
of their shortcomings. R³ technology employs an innovative
modulator that synthesizes an AC ripple voltage signal V_R,
analogous to the output inductor ripple current. The AC
signal V_R enters a window comparator where the lower
threshold is the error amplifier output V_COMP, and the upper
threshold is a programmable voltage reference V_W, resulting
in generation of the PWM signal. The voltage reference V_W
sets the steady-state PWM frequency. Both edges of the
PWM can be modulated in response to input voltage
transients and output load transients, much faster than
conventional fixed-frequency PWM controllers. Unlike a
conventional hysteretic converter, the ISL6269A has an error
amplifier that provides ±1% voltage regulation at the FB pin.
The ISL6269A has a 1.5ms digital soft-start and can be
started into a pre-biased output voltage. A resistor divider is
used to program the output voltage setpoint. The ISL6269A
can be configured to operate in continuous-conduction-
mode (CCM) or diode-emulation-mode (DEM), which
improves light-load efficiency. In CCM the controller always
operates as a synchronous rectifier however, when DEM is
enabled the low-side MOSFET is permitted to stay off,
blocking negative current flow into the low-side MOSFET
from the output inductor.
Pinout
ISL6269A
(16 LD 4x4 QFN)
TOP VIEW
16 15 14 13
VIN 1
VCC 2
FCCM 3
EN 4
GND
12 PVCC
11 LG
10 PGND
9 ISEN
5678
Features
• High performance R³ technology
• Fast transient response
• ±1% regulation accuracy: -10°C to +100°C and
-40°C to +100°C
• Wide input voltage range: +5.0V to +25.0V
• Output voltage range: +0.6V to +3.3V
• Wide output load range: 0A to 25A
• Selectable diode emulation mode for increased light load
efficiency
• Programmable PWM frequency: 200kHz to 600kHz
• Pre-biased output start-up capability
• Integrated MOSFET drivers and bootstrap diode
• Internal digital soft-start
• Power good monitor
• Fault protection
- Undervoltage protection
- Soft crowbar overvoltage protection
- Low-side MOSFET r_DS(ON) overcurrent protection
- Over-temperature protection
- Fault identification by PGOOD pull down resistance
• Pb-free plus anneal available (RoHS compliant)
Applications
• PCI express graphical processing unit
• Auxiliary power rail
• VRM
• Network adapter
Ordering Information
PART NUMBER PART
(Note)
MARKING
TEMP
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6269ACRZ* 62 69ACRZ -10 to +100 16 Ld 4x4 QFN L16.4x4
ISL6269AIRZ* 62 69AIRZ -40 to +100 16 Ld 4x4 QFN L16.4x4
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb 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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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