ISL78205 Datasheet, PDF (1/16 Pages) Intersil Corporation – 2.5A Buck Controller with Integrated High-Side MOSFET

2.5A Buck Controller with Integrated High-Side MOSFET
ISL78205
The ISL78205 is a synchronous buck controller with a 90mΩ
high side MOSFET and low side driver integrated. The
ISL78205 supports a wide input voltage range from 3V to 40V.
Regarding the output current capability, the ISL78205 can
typically support a continuous load of 2.5A under conditions of
5V V_OUT, V_IN range of 8V to 30V, 500kHz, +85°C ambient
temperature with still air. For any specific application, the
actual maximum output current depends upon the die
temperature not exceeding +125°C with the power dissipated
in the IC, which is related to input voltage, output voltage, duty
cycle, switching frequency, ambient temperature and board
layout, etc. Refer to “Output Current” on page 12 for more
details.
The ISL78205 offers the most robust current protections. It
uses peak current mode control with cycle-by-cycle current
limiting. It is implemented with frequency foldback under
current limit conditions. In addition, the hiccup overcurrent
mode is also implemented to guarantee reliable operations
under harsh short conditions.
The ISL78205 has comprehensive protections against various
faults, including overvoltage and over-temperature protections,
etc.
Features
• Ultra Wide Input Voltage Range 3V to 40V
• Less than 3µA Standby Input Current (IC Disabled)
• Temperature Range -40°C to +105°C
• Integrated 90mΩ 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
• 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
VIN
BOOT
VCC
ILIMIT
SS
FS
DGND
SGND
ISL78205 _PHASE
LGATE
PGND
FB
COMP
VIN
VOUT
FIGURE 1. TYPICAL APPLICATION SCHEMATIC I - SYNCHRONOUS
BUCK
100
95 ^6V
90
85
12V
80
24V
75
40V
70
65
60
55
50
45
40
35
30
0.0
0.5
1.0
1.5
2.0
2.5
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, 500kHZ, V_OUT 5V,
T_A = +25°C
September 22, 2011
1
FN7926.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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