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PDF XR79120 Data sheet ( Hoja de datos )
| Número de pieza | XR79120 | |
| Descripción | 20A Synchronous Step Down COT Power Module | |
| Fabricantes | Exar | |
| Logotipo |  |
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XR79120
22V, 20A Synchronous Step Down COT Power Module
General Description
The XR79120 is a 20A synchronous step-down Power Module for point-of
load supplies. A wide 4.5V to 22V input voltage range allows for single
supply operation from industry standard 5V, 12V, and 19.6V rails.
With a proprietary emulated current mode Constant On-Time (COT) con-
trol scheme, the XR79120 provides extremely fast line and load transient
response using ceramic output capacitors. It requires no loop compensa-
tion hence simplifying circuit implementation and reducing overall compo-
nent count. The control loop also provides 0.12% load and 0.17% 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. With a 93% peak efficiency and 84% for loads as low as
100mA, the XR79120 is suitable for applications where low power losses
are important.
A host of protection features, including over-current, over-temperature,
short-circuit and UVLO, help achieve safe operation under abnormal
operating conditions.
The XR79120 is available in a RoHS compliant, green/halogen free
space-saving 74-pin 12x14x4mm QFN package. With integrated control-
ler, drivers, bootstrap diode and capacitor, MOSFETs, inductor, CIN and
COUT, this solution allows the smallest possible 20A POL design.
FEATURES
Controller, drivers, bootstrap diode and capaci-
tor, MOSFETs, Inductor, CIN and COUT integrated
in one package
20A Step Down Module
Wide 4.5V to 22V Input Voltage Range
>0.6V Adjustable Output Voltage
Proprietary Constant On-Time Control
No Loop Compensation Required
Stable Ceramic Output Capacitor Operation
Programmable 200ns to 2μs On-Time
Constant 400kHz to 600kHz Frequency
Selectable CCM or CCM/DCM
CCM/DCM for high efficiency at light-load
CCM for constant frequency at light-load
Programmable Hiccup Current Limit with Ther-
mal Compensation
Precision Enable and Power Good flag
Programmable Soft-start
74-pin 12x14x4mm QFN package
APPLICATIONS
Networking and Communications
Fast Transient Point-of-Loads
Industrial and Medical Equipment
Embedded High Power FPGA
Ordering Information – back page
Typical Application
VIN
Enable/Mode
Power Good
CIN
R
VIN PVIN
EN/MODE
PGOOD
VOUT
VCC XR79120 SW
SS ILIM
CVCC
CSS
TON
RON
AGND
FB
PGND
RLIM
CFF R1
R2
VOUT
COUT
Line Regulation
1.820
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
4 6 8 10 12 14 16 18 20 22
VIN (V)
© 2014 Exar Corporation
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Rev 1A
1 page  
Pin Configuration, Top View
XR79120
© 2014 Exar Corporation
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XR79120
Efficiency and Package Thermal Derating
Unless otherwise noted: TAMBIENT = 25°C, No Air flow, f=500kHz, Schematic from the application information section.
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
1.8V DCM
1.5V DCM
1.2V DCM
1.0V DCM
1.0
1.8V CCM
1.5V CCM
1.2V CCM
1.0V CCM
10.0
IOUT (A)
Figure 19: Efficiency, VIN=5V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
3.3V DCM
2.5V DCM
1.8V DCM
1.5V DCM
1.2V DCM
1.0V DCM
3.3V CCM
2.5V CCM
1.8V CCM
1.5V CCM
1.2V CCM
1.0V CCM
600kHz
1.0 10.0
IOUT (A)
Figure 21: Efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
1.8V DCM
1.2V DCM
1.8V CCM
1.2V CCM
1.0 10.0
IOUT (A)
Figure 23: Efficiency, VIN=19.6V
130
120
110
100
90
80 1.0 VOUT
1.2 VOUT
70 1.8 VOUT
60
50
40
30
2 4 6 8 10 12 14 16 18 20
IOUT (A)
Figure 20: Maximum TAMBIENT vs IOUT, VIN=5V
130
120
110
100
90 600kHz
80 1.0 VOUT
70 1.2 VOUT
1.8 VOUT
60 3.3 VOUT
50
40
30
2 4 6 8 10 12 14 16 18 20
IOUT (A)
Figure 22: Maximum TAMBIENT vs IOUT, VIN=12V
130
120
110
100
90
80
70 1.2 VOUT
60 1.8 VOUT
50
40
30
2 4 6 8 10 12 14 16 18 20
IOUT (A)
Figure 24: Maximum TAMBIENT vs IOUT, VIN=19.6V
© 2014 Exar Corporation
11 / 19
exar.com/XR79120
Rev 1A
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet XR79120.PDF ] | |
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