ISL78206 Datasheet, PDF (1/19 Pages) Intersil Corporation – 40V 2.5A Buck Controller with Integrated High-side 40V 2.5A Buck Controller with Integrated High-side

DATASHEET
40V 2.5A Buck Controller with Integrated High-side
MOSFET
ISL78206
The ISL78206 is an AEC-Q100 qualified 40V, 2.5A synchronous
buck controller with a high-side MOSFET and low-side driver
integrated. The ISL78206 supports a wide input voltage range
from 3V to 40V, output current up to 2.5A, and can be
operated in synchronous and non-synchronous buck
topologies. The ISL78206 provides a low system cost, high
efficiency, single part buck solution for automotive
applications for a wide variety of input voltages. For vehicle
systems that must be kept powered during cold-cranking or
start-stop operation, the ISL78206 can be replaced by its
pin-to-pin alternative, the ISL78201 which offers boost-buck
operation. Together, these devices offer two functional
alternatives on the same PCB layout, providing convenience,
flexibility, and facilitating extensive design reuse.
The ISL78206 offers the most robust current protections. It
uses peak current mode control with cycle-by-cycle current
limiting. It is implemented with frequency foldback
undercurrent limit conditions. In addition, the hiccup
overcurrent mode is also implemented to guarantee reliable
operations under harsh short conditions.
The ISL78206 has comprehensive protections against various
faults, including overvoltage, undervoltage, programmable
overcurrent and over-temperature. Built-in soft-start allows the
IC to start-up smoothly and is reactivated during hiccup mode
fault recovery.
Features
• Ultra wide input voltage range 3V to 40V (refer to “Input
Voltage” on page 12 for more details)
• Less than 5µA (max) shutdown input current (IC disabled)
• Temperature range -40°C to +105°C
• Integrated high-side MOSFET
• Operational topologies
- Synchronous buck
- Non-synchronous buck
• Programmable frequency from 200kHz to 2.2MHz and
frequency synchronization capability
• ±1% tight voltage regulation accuracy
• Reliable cycle-by-cycle overcurrent protection
- Temperature compensated current sense
- Frequency foldback
- Programmable OC limit
- Hiccup mode protection in worst case short condition
• 20 Ld HTSSOP package, pin-to-pin compatible with
ISL78201 boost buck
• AEC-Q100 qualified
• Pb-free (RoHS compliant)
Applications
• _{Automotive applications}
• General purpose power regulator
• 24V bus power
• Battery power
• Embedded processor and I/O supplies
PGOOD
EN
SYNC
FS
VCC
ILIMIT
SS
ISL78206
VIN
BOOT
PHASE
LGATE
DGND
SGND
PGND
FB
COMP
VIN
VOUT
FIGURE 1. TYPICAL APPLICATION SCHEMATIC I - SYNCHRONOUS
BUCK
100
95 ^6V
90
85
80
75
70
65
60
55
50
45
40
35
300.0
12V
0.5
24V
40V
1.0
1.5
2.0
2.5
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, 500kHz, V_OUT 5V,
T_A = +25°C
March 25, 2015
1
FN8618.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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