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XR76121ELTR-F

更新时间： 2024-11-26 01:06:19
品牌 Logo 应用领域
艾科嘉 - EXAR /
页数 文件大小 规格书
18页 1225K
描述
PowerBloxTM 20A Synchronous Step-Down COT Regulators

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XR76121ELTR-F 数据手册

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XR76121  
TM  
PowerBlox 20A Synchronous  
Step-Down COT Regulators  
Description  
FEATURES  
The XR76121 is a synchronous step-down regulator combining the  
controller, drivers, bootstrap diode and MOSFETs in a single package  
for point-of-load supplies. The XR76121 has a load current rating  
of 20A. A wide 5V to 22V input voltage range allows for single supply  
operation from industry standard 5V, 12V and 19.6V rails.  
ꢀ■  
20A step-down regulator  
4.5V to 5.5V low VIN operation  
5V to 22V wide single input voltage  
3V to 22V operation with external  
5V bias  
≥0.6V adjustable output voltage  
Proprietary constant on-time control  
No loop compensation required  
Ceramic output capacitor stable  
operation  
With a proprietary emulated current mode constant on-time (COT)  
control scheme, the XR76121 provides extremely fast line and  
load transient response using ceramic output capacitors. They  
require no loop compensation, simplifying circuit implementation  
and reducing overall component count. The control loop also  
provides 0.1% load and 0.1% line regulation and maintains constant  
operating frequency. A selectable power saving mode, allows the user  
to operate in discontinuous mode (DCM) at light current loads thereby  
significantly increasing the converter efficiency.  
ꢀ■  
Programmable 70ns-1µs on-time  
Constant 200kHz-1MHz frequency  
Selectable CCM or CCM/DCM  
operation  
Power-good flag with low impedance when  
power removed  
ꢀ■  
ꢀ■  
ꢀ■  
ꢀ■  
Precision enable  
Programmable soft-start  
5mm x 6mm QFN package  
A host of protection features, including overcurrent, over temperature,  
overvoltage, short-circuit, open feedback detect and UVLO, helps  
achieve safe operation under abnormal operating conditions.  
APPLICATIONS  
The XR76121 is available in a RoHS compliant, green/halogen-free  
space-saving 5mm x 6mm QFN package.  
ꢀ■  
Servers  
Distributed power architecture  
Point-of-load converters  
FPGA, DSP and processor supplies  
ꢀ■  
ꢀ■  
ꢀ■  
ꢀ■  
Base stations, switches/routers  
Typical Application  
100  
C
L1  
C
V
600kHz  
ENABLE  
BST  
OUT  
98  
96  
94  
92  
90  
88  
86  
84  
82  
80  
78  
76  
74  
72  
70  
EN  
BST  
SW  
V
IN  
VIN  
R
FF  
LIM  
PVIN  
PGOOD  
VCC  
SS  
ILIM  
R1  
R2  
POWER GOOD  
R
FF  
800kHz  
XR76121  
FB  
FCCM  
VSNS  
PGND  
C
IN  
C
OUT  
R
5.0V  
3.3V  
2.5V  
1.8V  
1.5V  
1.2V  
1.0V  
V
OUT  
R1  
TON  
AGND  
R
ON  
R2  
C
C
SS  
VCC  
0.1  
5.1  
10.1  
15.1  
20.1  
I
( )  
A
OUT  
Figure 1. Typical Application  
Figure 2. Efficiency  
REV1A  
1/18  
1234567...18

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