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ISL78235

更新时间： 2024-11-20 01:05:43
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瑞萨 - RENESAS /
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23页 2183K
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5A Automotive Synchronous Buck Regulator

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ISL78235 数据手册

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DATASHEET  
ISL78235  
5A Automotive Synchronous Buck Regulator  
FN8713  
Rev 6.00  
September 22, 2016  
The ISL78235 is a highly efficient, monolithic, synchronous  
step-down DC/DC converter that can deliver 5A of continuous  
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.  
Features  
• 2.7V to 5.5V input voltage range  
• 2MHz default switching frequency  
• 100ns guaranteed phase minimum on time for wide output  
regulation  
The ISL78235 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, input UVLO protections  
• 1% reference accuracy over-temperature  
• Up to 95% efficiency  
The ISL78235 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  
• Common pinout family allows migration from 3A to 5A  
without PCB change:  
- ISL78233 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A  
- ISL78234 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4A  
- ISL78235 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A  
over-temperature protections. A power-good monitor indicates  
when the output is in regulation. The ISL78235 offers a 1ms  
Power-Good (PG) timer at power-up.  
When in shutdown, the ISL78235 discharges the output  
capacitor through an internal 100Ω soft-stop switch. Other  
features include internal fixed or adjustable soft-start and  
internal/external compensation.  
Applications  
• DC/DC POL modules  
• μC/µP, FPGA and DSP power  
• Video processor/SOC power  
• Automotive infotainment power  
The ISL78235 is available in a 3mmx3mm 16 Ld Thin Quad Flat  
No-lead (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  
ISL78235 is rated to operate across the temperature range of  
-40°C to +105°C in the 3mmx3mm package and -40°C to  
+125°C in the 5mmx5mm package.  
Related Literature  
• UG015, “ISL7823xEVAL1Z Evaluation Board User Guide”  
• ISL78233, ISL78234 Datasheet  
• UG062, “ISL7823xEVAL2Z Evaluation Board User Guide”  
L
100  
90  
V
OUT  
5A LOAD  
DSP, FPGA  
2.7V TO 5.5V  
C
OUT  
C
2.5V  
OUT  
IN  
80  
3.3V  
16  
15  
14  
13  
OUT  
1.2V  
1.8V  
OUT  
PGND  
PGND  
SGND  
FB  
VIN  
1.5V  
OUT  
OUT  
1
2
3
4
12  
11  
10  
9
70  
60  
50  
40  
VDD  
PG  
*ISL78235  
SYNC  
7
8
6
5
T
= +25°C  
A
*Pin Compatible  
ISL78233 - 3A BUCK  
ISL78234 - 4A BUCK  
0.0 0.5 1.0 1.5 2.0 2.5  
3.0 3.5 4.0 4.5  
5.0  
OUTPUT LOAD (A)  
FIGURE 1. TYPICAL APPLICATION: 5A BUCK REGULATOR  
FIGURE 2. EFFICIENCY vs LOAD (V = 5V; f = 2MHz; SYNC = GND)  
IN sw  
FN8713 Rev 6.00  
Page 1 of 23  
September 22, 2016  
1234567...23

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