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PDF ISL78201 Data sheet ( Hoja de datos )
| Número de pieza | ISL78201 | |
| Descripción | 40V 2.5A Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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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 VIN drops below VOUT, 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 VOUT under 12V VIN and 5V VOUT 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, VOUT 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 VIN
90
85 12V VIN
80
75 40V VIN
70 24V VIN
65
60
55
50
0.1m
1m
10m
100m
1 2.5
LOAD CURRENT (A)
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,
VOUT 5V, TA = +25°C
March 31, 2015
FN8615.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014, 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL78201
Typical Application Schematic I
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL78201 PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
VOUT
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL78201 PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
VIN
VOUT
FIGURE 4A. SYNCHRONOUS BUCK
FIGURE 4B. NON-SYNCHRONOUS BUCK
Typical Application Schematic II - VCC Switch Over to VOUT
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL78201 PHASE
LGATE
EXT_BOOST
FS
SGND
PGND
FB
COMP
VIN
VOUT
PGOOD
EN
MODE
SYNC
AUXVCC
VIN
BOOT
VCC
ILIMIT
SS
ISL78201 PHASE
LGATE
PGND
EXT_BOOST
FS
SGND
FB
COMP
VIN
FIGURE 5A. SYNCHRONOUS BUCK
FIGURE 5B. NON-SYNCHRONOUS BUCK
Typical Application Schematic III - Boost Buck Converters
VOUT
Battery
R1 +
R2
PGOOD
EN
MODE
SYNC
VCC
ILIMIT
SS
EXT_BOOST
LGATE
AUXVCC
ISL78201
VIN
BOOT
PHASE
FS
SGND
PGND
FB
COMP
+
R3
R4
VOUT
PGOOD
EN
SYNC
EXT_BOOST
AUXVCC
VIN
VCC
ILIMIT
SS
FS
SGND
BOOT
ISL78201 PHASE
PGND
LGATE
FB
COMP
1M
130k
VCC
VIN
VOUT
FIGURE 6A. 2-STAGE BOOST BUCK
FIGURE 6B. NON-INVERTING SINGLE INDUCTOR BUCK BOOST
Submit Document Feedback
5
FN8615.1
March 31, 2015
5 Page 
Performance Curves (Continued)
ISL78201
VOUT 2V/DIV
PHASE 20V/DIV
VOUT 2V/DIV
PHASE 20V/DIV
2ms/DIV
FIGURE 18. SYNCHRONOUS BUCK MODE, VIN 36V, IO 2A,
ENABLE ON
2ms/DIV
FIGURE 19. SYNCHRONOUS BUCK MODE, VIN 36V, IO 2A,
ENABLE OFF
VOUT 2V/DIV
PHASE 20V/DIV
VOUT 20mV/DIV (5V OFFSET)
PHASE 20V/DIV
2ms/DIV
FIGURE 20. VIN 36V, PREBIASED START-UP
5µs/DIV
FIGURE 21. SYNCHRONOUS BUCK WITH FORCE PWM MODE,
VIN 36V, IO 2A
VOUT 100mV/DIV (5V OFFSET)
IOUT 1A/DIV
PHASE 20V/DIV
1ms/DIV
FIGURE 22. VIN 24V, 0 TO 2A STEP LOAD, FORCE PWM MODE
Submit Document Feedback 11
VOUT 70mV/DIV (5V OFFSET)
VOUT 1V/DIV
LGATE 5V/DIV
PHASE 20V/DIV
100µs/DIV
FIGURE 23. VIN 24V, 80mA LOAD, PFM MODE
FN8615.1
March 31, 2015
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL78201.PDF ] | |
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