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PDF XR76203 Data sheet ( Hoja de datos )

Número de pieza XR76203
Descripción 3A/5A/8A Synchronous Step Down COT Regulator
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XR76203/5/8
40V PowerBloxTM
3A/5A/8A Synchronous Step Down COT Regulator
General Description
The XR76203, XR76205 and XR76208 are synchronous step-down regu-
lators combining the controller, drivers, bootstrap diode and MOSFETs in
a single package for point-of-load supplies. The XR76203, XR76205 and
XR76208 have load current ratings of 3A, 5A and 8A respectively. A wide
5V to 40V input voltage range allows for single supply operation from
industry standard 24V ±10%, 18V-36V, and rectified 18VAC and 24VAC
rails.
With a proprietary emulated current mode Constant On-Time (COT) con-
trol scheme, the XR76203, XR76205 and XR76208 provide 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
0.07% load and 0.15% line regulation and maintains constant operating
frequency. A selectable power saving mode allows the user to operate in
discontinuous conduction mode (DCM) at light current loads thereby sig-
nificantly increasing the converter efficiency.
A host of protection features, including over-current, over-temperature,
short-circuit and UVLO, helps achieve safe operation under abnormal
operating conditions.
The XR76203/5/8 are available in a RoHS-compliant, green/halogen-free
space-saving QFN 5x5mm package.
FEATURES
Controller, drivers, bootstrap diode and
MOSFETs integrated in one package
3A, 5A and 8A Step Down Regulators
Wide 5V to 40V 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 100kHz to 800kHz 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
Thermal Compensation
Precision Enable and Power Good flag
Programmable Soft-start
30-pin 5x5mm QFN package
APPLICATIONS
Distributed Power Architecture
Point-of-Load Converters
Power Supply Modules
FPGA, DSP, and Processor Supplies
Base Stations, Switches/Routers, and Servers
Ordering Information – back page
Typical Application
VIN
Enable/Mode
Power Good
CIN
R
VIN PVIN
EN/MODE
BST
PGOOD
XR76208
VCC XR76205
SS XR76203
SW
ILIM
CVCC
CSS
TON
RON AGND
FB
PGND
CBST
RLIM
L1 VOUT
CFF R1
R2
COUT
Line Regulation
3.340
3.330
3.320
3.310
3.300
3.290
3.280
3.270
3.260
5
10 15 20 25 30 35 40
VIN (V)
© 2015 Exar Corporation
1 / 20
exar.com/XR76203/5/8
Rev 1A

1 page




XR76203 pdf
Pin Configuration, Top View
XR76203/5/8
BST
30
SW PVIN PVIN PVIN PVIN PVIN PVIN
29 28 27 26 25 24 23
ILIM 1
EN 2
TON 3
SS 4
PGOOD 5
FB 6
AGND 7
PVIN PAD
22 PVIN
21 PVIN
20 SW
19 PGND
AGND PAD
SW PAD
18 PGND
PGND 17
PAD
PGND
16 PGND
8 9 10 11
VIN VCC AGND SW
12 13 14
SW SW SW
15 PGND
© 2015 Exar Corporation
5 / 20
exar.com/XR76203/5/8
Rev 1A

5 Page





XR76203 arduino
XR76203/5/8
Efficiency
Unless otherwise noted: TAMBIENT = 25°C, No Air flow, f=400kHz, Inductor losses are included, Schematic from the applica-
tion information section.
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
3.3uH
2.2uH
1.5uH
5.0V DCM
3.3V DCM
1.8V DCM
1.0
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 19: XR76208 efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
200kHz, 8.2uH
3.3uH
2.2uH
1.5uH
12V DCM
5.0V DCM
3.3V DCM
1.8V DCM
1.0
12V CCM
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 20: XR76208 efficiency, VIN=24V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
4.7uH
3.3uH
2.2uH
5.0V DCM
3.3V DCM
1.8V DCM
1.0
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 21: XR76205 efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
200kHz 6.8uH
4.7uH
3.3uH
12V DCM
5.0V DCM
3.3V DCM
1.8V DCM
1.0
2.2uH
12V CCM
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 22: XR76205 efficiency, VIN=24V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
6.8uH
4.7uH
3.3uH
5.0V DCM
3.3V DCM
1.8V DCM
1.0
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 23: XR76203 efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
200kHz
10uH
6.8uH
4.7uH
3.3uH
12V DCM
5.0V DCM
3.3V DCM
1.8V DCM
1.0
12V CCM
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 24: XR76203 efficiency, VIN=24V
© 2015 Exar Corporation
11 / 20
exar.com/XR76203/5/8
Rev 1A

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