ISL78200 Datasheet, PDF (1/19 Pages) Intersil Corporation – 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter

2.5A Regulator with Integrated High-Side MOSFET for
Synchronous Buck or Boost Buck Converter
ISL78200
The ISL78200 is a synchronous buck controller with a 90mΩ
high side MOSFET and low side driver integrated. The ISL78200
supports a wide input voltage range from 3V to 40V. Regarding
the output current capability, the ISL78200 can typically support
a continuous load of 2.5A under conditions of 5V V_OUT, V_IN
range of 8V to 36V, 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 the Output
Current section on page 14 for more details.
The ISL78200 has flexible selection of operation modes of
forced PWM mode and PFM mode. In PFM mode, the
quiescent input current is as low as 300µA and can be further
reduced to 180µA with AUXVCC connected to V_OUT under 12V
V_IN and 5V V_OUT application. The load boundary between PFM
and PWM can be programmed to cover wide applications.
The low side driver can be either used to drive an external low
side MOSFET for a synchronous buck, or left unused for a
standard non-synchronous buck. The low side driver can also
be used to drive a boost converter as a pre-regulator that
greatly expands the operating input voltage range down to 3V
or lower (refer to “Typical Application Schematic III - Boost
Buck Converters” on page 5).
The ISL78200 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 condition; in addition, the hiccup overcurrent
mode is also implemented to guarantee reliable operations
under harsh short conditions.
The ISL78200 has comprehensive protections against various faults
including overvoltage and over-temperature protections, etc.
Features
• Ultra Wide Input Voltage Range 3V to 40V
• Selectable Mode Operation
- Forced PWM Mode
- PFM Mode
- Programmable Current Boundary between PFM and PWM
Modes
• 300µA IC Quiescent Current (PFM, No Load); 180µA Input
Quiescent Current (PFM, No Load, V_OUT Connected to AUXVCC)
• Less than 3µA Standby Input Current (IC Disabled)
• Operational Topologies
- Synchronous Buck
- Non-Synchronous Buck
- Two Stage Boost Buck
• Programmable Frequency from 200kHz - 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
VIN
VIN
MODE
SYNC
AUXVCC
BOOT
VCC
ILIMIT
SS
ISL78200 _PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
FIGURE 1. TYPICAL APPLICATION
VOUT
100
95
6V V_IN
90
85
12V V_IN
80
75
40V V_IN
24V V_IN
70
65
60
55
50
0.1m
1m
10m
100m
1 2.5
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
V_OUT 5V, T_A = +25°C
September 22, 2011
1
FN7641.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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