ISL78200_14 Datasheet, PDF (1/22 Pages) Intersil Corporation – 2.5A Regulator with Integrated High-Side MOSFET for Synchronous Buck or Boost Buck Converter

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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 wide input range of 3V to 40V in buck mode. It supports
2.5A continuous load under conditions of 5V V_OUT, V_IN range of
8V to 36V, 500kHz and +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 section “Output
Current” 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 2.5V 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
• Buck Mode: Input Voltage Range 3V to 40V (Refer to “Input
Voltage” on page 14 for more details)
• Boost Mode Expands Operating Input Voltage Lower Than
2.5V (Refer to “Input Voltage” on page 14 for more details)
• Selectable Forced PWM Mode or PFM Mode
• 300µA IC Quiescent Current (PFM, No Load); 180µA Input
Quiescent Current (PFM, No Load, V_OUT Connected to AUXVCC)
• Less than 3µA Shut Down 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
• 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
VIN
VIN
MODE
SYNC
AUXVCC
BOOT
VCC
ILIMIT
SS
ISL78200 _PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
FIGURE 1. TYPICAL APPLICATION
December 24, 2013
1
FN7641.2
VOUT
100
95
6V V_IN
90
85
12V V_IN
80
75
40V V_IN
70
24V V_IN
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
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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