ISL8106 Datasheet, PDF (1/15 Pages) Intersil Corporation – Wide VIN, 7V to 25V, Single-Phase PWM Controller with Integrated MOSFET Drivers

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Data Sheet
November 10, 2006
ISL8106
FN9283.1
Wide VIN, 7V to 25V, Single-Phase PWM
Controller with Integrated MOSFET
Drivers
The ISL8106 is a Single-Phase Synchronous-Buck PWM
Controller with a input voltage range of +7.0V to +25.0V
featuring Intersil's Robust Ripple Regulator (R³) technology
that delivers exceptional dynamic response to input voltage
and output load transients. Integrated MOSFET drivers, 5V
LDO, and bootstrap diode result in fewer components and
smaller implementation area for power supply systems.
The ISL8106 features 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 ISL8106
can be configured to operate in forced-continuous-
conduction-mode (FCCM) or in diode-emulation-mode
(DEM), which improves light-load efficiency. In FCCM the
controller always operates as a synchronous rectifier,
switching the bottom-side MOSFET regardless of the output
load. With DEM enabled, the bottom-side MOSFET is
disabled preventing negative current flow from the output
inductor during low load operation. This makes the ISL8106
an excellent choice for all “green” applications. An audio
filter prevents the PWM switching frequency from entering
the audible spectrum due to extremely light load while in
DEM.
A PGOOD pin featuring a unique fault-identification
capability significantly reduces system trouble-shooting time
and effort. The pull-down resistance of the PGOOD pin is
30Ω for an overcurrent fault, 60Ω for an overvoltage fault, or
90Ω for either an undervoltage fault or during soft-start.
Overcurrent protection is accomplished by measuring the
voltage drop across the r_DS(ON) of the bottom-side
MOSFET. A single resistor programs the overcurrent and
short-circuit points. Overvoltage and undervoltage protection
is monitored at the FB voltage feedback pin.
Pinout
16 LD QFN (4mm x 4mm)
TOP VIEW
16 15 14 13
VIN 1
VCC 2
FCCM 3
EN 4
GND
12 PVCC
11 BGATE
10 PGND
9 BSOC
5678
Features
• Wide input voltage range: +7.0V to +25.0V
• High performance R³ technology delivers extremely fast
transient response
• +0.6V Internal Reference
- ±0.6% tolerance over the commercial temperature
Range (0°C to +70°C)
- ±1.0% tolerance over the industrial temperature range
(-40°C to +85°C)
• Output voltage range: +0.6V to V_CC-0.3V
• Selectable forced continuous conduction mode or diode
emulation mode
• Integrated MOSFET drivers with shoot-through protection
• External type-two loop compensation
• Internal 5V low-dropout regulator with Integrated boot-
strap diode
• Programmable PWM frequency: 200kHz to 600kHz
• PWM minimum frequency above audible spectrum
• Internal digital soft-start with prebiased startup capability
• Power good monitor with fault identification by PGOOD
pull down resistance
• Lossless, programmable overcurrent protection
- Uses bottom-side MOSFET’s r_DS(ON)
• Undervoltage protection, soft crowbar overvoltage
protection and over-temperature protection
• Pb-free plus anneal available (RoHS compliant)
Applications
• Telecom/datacom applications
• Industrial applications
• Distributed DC/DC power architecture
• Point-of-load modules
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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