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PDF XR79110 Data sheet ( Hoja de datos )
| Número de pieza | XR79110 | |
| Descripción | 10A Synchronous Step Down COT Power Module | |
| Fabricantes | Exar | |
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XR79110
22V, 10A Synchronous Step Down COT Power Module
General Description
The XR79110 is a 10A 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 XR79110 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 0.35% 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. With a 96% peak efficiency and 90% for loads as low as
100mA, the XR79110 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 XR79110 is available in a RoHS compliant, green/halogen free
space-saving 72-pin 10x10x4mm QFN package with a 260°C lead solder
temperature. With integrated controller, drivers, bootstrap diode and
capacitor, MOSFETs, inductor, CIN and COUT, this solution allows the
smallest possible 10A POL design.
FEATURES
Controller, drivers, bootstrap diode and capaci-
tor, MOSFETs, Inductor, CIN and COUT integrated
in one package
10A 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
72-pin 10x10x4mm QFN package 260°C solder
temperature
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
R3
VIN PVIN
EN/MODE
PGOOD
VOUT
VCC XR79110 SW
SS ILIM
CVCC
CSS
TON
RON
AGND
FB
PGND
RLIM
Line Regulation
1.220
1.215
VOUT
1.210
1.205
1.200
R1 1.195
COUT
1.190
R2 1.185
1.180
4 6 8 10 12 14 16 18 20 22
VIN (V)
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Pin Configuration, Top View
XR79110
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XR79110
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
3.3V DCM
2.5V DCM
1.8V DCM
1.5V DCM
1.2V DCM
1.0V DCM
1.0
IOUT (A)
3.3V CCM
2.5V CCM
1.8V CCM
1.5V CCM
1.2V CCM
1.0V CCM
10.0
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
1.0
IOUT (A)
600kHz
10.0
Figure 21: Efficiency, VIN=12V
100
95
1.8V DCM
1.8V CCM
90
1.2V DCM
1.2V CCM
85
80
75
70
65
60
0.1
1.0
IOUT (A)
Figure 23: Efficiency, VIN=19.6V
10.0
130
120
110
100
90 1.0 VOUT
1.8 VOUT
80 3.3 VOUT
70
60
50
1 2 3 4 5 6 7 8 9 10
IOUT (A)
Figure 20: Maximum TAMBIENT vs IOUT, VIN=5V
130
120
110
100
90 1.0 VOUT
1.8 VOUT
80
3.3 VOUT
70
60
50
1 2 3 4 5 6 7 8 9 10
IOUT (A)
Figure 22: Maximum TAMBIENT vs IOUT, VIN=12V
130
120
110
100
90 1.2 VOUT
1.8 VOUT
80
70
60
50
1 2 3 4 5 6 7 8 9 10
IOUT (A)
Figure 24: Maximum TAMBIENT vs IOUT, VIN=19.6V
© 2015 Exar Corporation
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exar.com/XR79110
Rev 2A
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet XR79110.PDF ] | |
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