ISL78201 Datasheet, PDF (1/23 Pages) Intersil Corporation – 40V 2.5A Regulator with Integrated High-side MOSFET for Synchronous Buck or Boost Buck Converter

DATASHEET
40V 2.5A Regulator with Integrated High-side MOSFET
for Synchronous Buck or Boost Buck Converter
ISL78201
The ISL78201 is an AEC-Q100 qualified 40V, 2.5A synchronous
buck or boost buck controller with a high-side MOSFET and
low-side driver integrated. In buck mode, the ISL78201 supports
a wide input range of 3V to 40V. In boost-buck mode, the input
range can be extended down to 2.5V and output regulation can be
maintained when V_IN drops below V_OUT, enabling sensitive
electronics to remain on during cold-cranking and start-stop
applications.
The ISL78201 has a flexible selection of operation modes
including forced PWM mode and an optional switch to PFM mode
for light loads. 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 ISL78201 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
condition; in addition, the hiccup overcurrent mode is also
implemented to guarantee reliable operations under harsh short
conditions. The ISL78201 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 15 for more details)
• Boost mode expands operating input voltage lower than 2.5V
(refer to “Input Voltage” on page 15 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 tied to AUXVCC)
• Less than 5µA (MAX) shutdown input current (IC disabled)
• Operational topologies
- Synchronous buck
- Non-synchronous buck
- Two stage boost buck
- Non-inverting single inductor buck boost
• 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
- Programmable OC limit
- Frequency foldback and hiccup mode protection
• 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
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL78201 _PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
VOUT
FIGURE 1. TYPICAL APPLICATION
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
LOAD CURRENT (A)
1 2.5
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
V_OUT 5V, T_A = +25°C
March 31, 2015
1
FN8615.1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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