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ISL85403DEMO1Z

更新时间： 2024-11-16 02:51:47
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2.5A Regulator with Integrated High-side MOSFET for Synchronous Buck or Boost Buck Converter

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DATASHEET  
ISL85403  
FN8631  
Rev 1.00  
March 13, 2015  
2.5A Regulator with Integrated High-side MOSFET for Synchronous Buck or  
Boost Buck Converter  
The ISL85403 is a 40V, 2.5A synchronous buck or boost buck  
Features  
controller with a high-side MOSFET and low-side driver  
• Buck mode: input voltage range 3V to 40V (refer to “Input  
Voltage” on page 15 for more details)  
integrated. In buck mode, the ISL85403 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 drops below V , enabling sensitive  
• Boost mode expands operating input voltage lower than  
2.5V (refer to “Input Voltage” on page 15 for more details)  
IN  
OUT  
electronics to remain on in low input voltage conditions.  
• Selectable forced PWM mode or PFM mode  
The ISL85403 has a flexible selection of operation modes of  
forced PWM mode and PFM mode. In PFM mode, the  
quiescent input current is as low as 180µA (AUXVCC connected  
• 300µA IC quiescent current (PFM, no load); 180µA input  
quiescent current (PFM, no load, V  
tied to AUXVCC)  
OUT  
• Less than 5µA (MAX) shutdown input current (IC disabled)  
to V  
). The load boundary between PFM and PWM can be  
OUT  
programmed to cover wide applications.  
• Operational topologies  
- Synchronous buck  
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 preregulator followed by a buck  
controlled by the same IC, which greatly expands the operating  
input voltage range down to 2.5V or lower (Refer to “Typical  
Application Schematic III - Boost Buck Converter” on page 6).  
- Non-synchronous buck  
- Two-stage boost buck  
- Non-inverting single inductor buck boost  
• Programmable frequency from 200kHz to 2.2MHz and  
frequency synchronization capability  
• ±1% tight voltage regulation accuracy  
The ISL85403 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; also, the hiccup overcurrent mode is also  
implemented to guarantee reliable operations under harsh  
short conditions.  
• Reliable overcurrent protection  
- Temperature compensated current sense  
- Cycle-by-cycle current limiting with frequency foldback  
- Hiccup mode for worst case short condition  
• 20 Ld 4x4 QFN package  
• Pb-free (RoHS compliant)  
The ISL85403 has comprehensive protections against various  
faults including overvoltage and over-temperature protections,  
etc.  
Applications  
• General purpose  
• 24V bus power  
Related Literature  
• AN1960, “ISL85403DEMO1Z Demonstration Board User  
Guide”  
• Battery power  
• UG010, “ISL85403EVAL2Z Evaluation Board User Guide”  
•
Point-of-load  
• Embedded processor and I/O supplies  
100  
95  
90  
85  
80  
75  
70  
65  
60  
55  
50  
6V V  
IN  
PGOOD  
EN  
V
IN  
VIN  
MODE  
SYNC  
AUXVCC  
12V V  
IN  
BOOT  
36V V  
ISL85403  
IN  
VCC  
ILIMIT  
SS  
V
OUT  
24V V  
PHASE  
LGATE  
IN  
PGND  
FB  
EXT_BOOST  
FS  
SGND  
COMP  
0.1m  
1m  
10m  
100m  
1.0  
2.5  
LOAD CURRENT (A)  
FIGURE 1. TYPICAL APPLICATION  
FIGURE 2. EFFICIENCY, SYNCHRONOUS BUCK, PFM MODE,  
5V, T = +25°C  
V
OUT  
A
FN8631 Rev 1.00  
March 13, 2015  
Page 1 of 24  
1234567...24

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