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ISL78235R5668

更新时间： 2024-11-24 14:58:11
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瑞萨 - RENESAS /
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21页 2369K
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Automotive 5A Synchronous Buck Regulator

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ISL78235R5668 数据手册

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DATASHEET  
ISL78235R5668  
Automotive 5A Synchronous Buck Regulator  
FN8769  
Rev 2.00  
Apr 19, 2018  
The ISL78235R5668 is a highly efficient, monolithic,  
Features  
synchronous step-down DC/DC converter that can deliver 5A  
continuous and up to 8A pulsed output current from a 2.7V to  
5.5V input supply. The device uses peak current mode control  
architecture to achieve very low duty cycle operation at high  
frequency with fast transient response and excellent loop stability.  
• 2.7 to 5.5V input voltage range  
• 5A continuous; 8A pulse output current operation  
• 2MHz default switching frequency  
• 100ns guaranteed phase minimum on-time for wide output  
regulation  
The ISL78235R5668 integrates a low ON-resistance P-channel  
(35mΩ, typical) high-side FET and N-channel (11mΩ, typical)  
low-side FET to maximize efficiency and minimize external  
component count. The 100% duty cycle operation allows less  
than 250mV dropout voltage at 5A output current. The  
operating 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.  
• Adjustable switching frequency from 500kHz to 4MHz  
• External synchronization from 1MHz to 4MHz  
• Optional PFM mode for light-load efficiency improvement  
• Very low ON-resistance HS/LS switches: 35mΩ/11mΩ  
• Internal 1ms or adjustable external soft-start  
• Soft-stop output discharge during disable  
• OTP, OCP, output OVP, and input UVLO protections  
• 1% reference accuracy over-temperature  
• Up to 95% efficiency  
The ISL78235R5668 can be configured for discontinuous  
(PFM) or forced continuous (PWM) 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.  
• AEC-Q100 qualified  
Fault protection is provided by internal hiccup mode current  
limiting during short-circuit and overcurrent conditions. The  
device also integrates output overvoltage and  
over-temperature protections. A power-good monitor indicates  
when the output is in regulation. The ISL78235R5668 offers a  
1ms Power-Good (PG) timer at power-up.  
Applications  
• Automotive infotainment power  
• DC/DC point-of-load modules  
• μC/µP, FPGA, and DSP power  
• Video processor/SOC power  
• Li-ion battery powered devices  
When in shutdown, the ISL78235R5668 discharges the output  
capacitor through an internal 100Ω soft-stop switch. Other  
features include internal fixed or adjustable soft-start and  
internal/external compensation.  
Related Literature  
The ISL78235R5668 is available in a 3mmx3mm 16 Ld Thin  
Quad Flat No-lead (TQFN) Pb-free package with an exposed pad  
for improved thermal performance. The ISL78235R5668 is  
rated to operate across the temperature range of -40°C to  
+85°C.  
For a full list of related documents, visit our website  
• ISL78235R5668 product page  
L
100  
V
OUT  
5A LOAD  
DSP, FPGA  
2.7V TO 5.5V  
C
OUT  
90  
80  
C
IN  
16  
14  
15  
13  
PGND  
PGND  
SGND  
FB  
VIN  
V
= 1.2V; T = -40°C  
1
2
3
4
12  
11  
10  
9
OUT  
70  
60  
VDD  
PG  
ISL78235R5668  
V
= 1.2V; T = +25°C  
OUT  
V
= 1.2V; T = +105°C  
OUT  
SYNC  
50  
40  
6
7
8
5
0
1
2
3
4
5
6
7
8
OUTPUT LOAD (A)  
FIGURE 1. TYPICAL APPLICATION: 5A BUCK REGULATOR  
FIGURE 2. EFFICIENCY vs LOAD (V = 5V)  
IN  
FN8769 Rev 2.00  
Apr 19, 2018  
Page 1 of 21  
1234567...21

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