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ISL78234EVAL1Z

更新时间： 2024-11-24 00:59:23
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瑞萨 - RENESAS /
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21页 1480K
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3A and 4A Compact Synchronous Buck Regulators

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DATASHEET  
ISL78233, ISL78234  
3A and 4A Compact Synchronous Buck Regulators  
FN8359  
Rev 8.00  
Apr 19, 2018  
The ISL78233, ISL78234 are highly efficient, monolithic,  
synchronous step-down DC/DC converters that can deliver 3A  
(ISL78233), or 4A (ISL78234) of continuous output current from  
a 2.7V to 5.5V input supply. The devices use current mode control  
architecture to deliver a very low duty cycle operation at high  
frequency with fast transient response and excellent loop stability.  
Features  
• 2.7V to 5.5V input voltage range  
• Very low ON-resistance FETs - P-channel 35mΩ and  
N-channel 11mΩ typical values  
• High efficiency synchronous buck regulator with up to 95%  
efficiency  
The ISL78233, ISL78234 integrate a very low ON-resistance  
P-channel (35mΩ) high-side FET and N-channel (11mΩ)  
low-side FET to maximize efficiency and minimize external  
component count. The 100% duty-cycle operation allows less  
than 200mV dropout voltage at 4A output current. The  
operation frequency of the Pulse-Width Modulator (PWM) is  
adjustable from 500kHz to 4MHz. The default switching  
frequency of 2MHz is set by connecting the FS pin high.  
• -1.2%/1% reference accuracy over temperature/load/line  
• Complete BOM with as few as 3 external parts  
• Internal soft-start - 1ms or adjustable  
• Soft-stop output discharge during disable  
• Adjustable frequency from 500kHz to 4MHz - default at  
2MHz  
The ISL78233, ISL78234 can be configured for discontinuous  
or forced continuous operation at light load. Forced continuous  
operation reduces noise and RF interference, while  
discontinuous mode provides higher efficiency by reducing  
switching losses at light loads.  
• External synchronization up to 4MHz  
• Over-temperature, overcurrent, overvoltage, and negative  
overcurrent protection  
• Shared common device pinout allows simplified output  
power upgrades over time  
Fault protection is provided by internal Hiccup mode current  
limiting during short-circuit and overcurrent conditions. Other  
protection, such as overvoltage and over-temperature are also  
integrated into the device. A power-good output voltage  
monitor indicates when the output is in regulation.  
• Tiny 3mmx3mm TQFN package  
• AEC-Q100 qualified  
Applications  
• DC/DC POL modules  
The ISL78233, ISL78234 offers a 1ms Power-Good (PG) timer  
at power-up. When in shutdown, the ISL78233, ISL78234  
discharges the output capacitor through an internal soft-stop  
switch. Other features include internal fixed or adjustable  
soft-start and internal/external compensation.  
• μC/µP, FPGA, and DSP power  
• Video processor/SOC power  
• Li-ion battery powered devices  
• Automotive infotainment power  
The ISL78233, ISL78234 is available in a 3mmx3mm 16 Ld  
Thin Quad Flat (TQFN) Pb-free package and in a 5mmx5mm  
16 Ld Wettable Flank Quad Flat No-Lead (WFQFN) package  
with an exposed pad for improved thermal performance. The  
ISL78233, ISL78234 are rated to operate across the  
temperature range of -40°C to +125°C.  
Related Literature  
For a full list of related documents, visit our website  
- ISL78233, ISL78234 product page  
100  
90  
3.3V  
OUT  
1.5V  
80  
OUT  
1.2V  
OUT  
1.8V  
OUT  
70  
60  
50  
40  
2.5V  
OUT  
0.0  
0.5  
1.0  
1.5  
2.0  
2.5  
3.0  
3.5  
4.0  
OUTPUT LOAD (A)  
FIGURE 1. EFFICIENCY vs LOAD (2MHz 5V PFM, T = +25°C)  
IN  
A
FN8359 Rev 8.00  
Apr 19, 2018  
Page 1 of 21  
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