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PDF XR76208-Q Data sheet ( Hoja de datos )

Número de pieza XR76208-Q
Descripción 3A/5A/8A Synchronous Step Down COT Regulator
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XR76203-Q/XR76205-Q/XR76208-Q
AEC-Q100 Qualified 40V PowerBloxTM
3A/5A/8A Synchronous Step Down COT Regulator
General Description
The XR76203-Q, XR76205-Q and XR76208-Q are synchronous step-
down regulators combining the controller, drivers, bootstrap diode and
MOSFETs in a single package for point-of-load supplies well suited for
automotive applications. Qualified per AEC-Q100, the XR76203-Q,
XR76205-Q and XR76208-Q have load current ratings of 3A, 5A and 8A
respectively. A wide 5.5V to 40V input voltage range allows for single sup-
ply operation from 12V battery systems required to withstand load dump,
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-Q, XR76205-Q and XR76208-Q provide
extremely fast line and load transient response using ceramic output
capacitors. They require no loop compensation, simplifying circuit imple-
mentation 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 significantly 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-Q are available in a RoHS-compliant, green/halogen-
free space-saving QFN 5x5mm package.
FEATURES
Automotive AEC-Q100 Qualified
Temperature Grade 1: -40°C to 125°C
HBM ESD Class Level 2
CDM ESD Class Level C4B
Controller, drivers, bootstrap diode and MOS-
FETs integrated in one package
3A, 5A and 8A Step Down Regulators
Wide 5.5V 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 with wettable flanks
APPLICATIONS
Automotive Systems
Distributed Power Architecture
Point-of-Load Converters
Power Supply Modules
FPGA, DSP, and Processor Supplies
Industrial and Military
Typical Application
VIN
Enable/Mode
Power Good
CIN
R
VIN PVIN
EN/MODE
BST
PGOOD
SW
XR76208-Q
VCC XR76205-Q
SS XR76203-Q ILIM
CVCC
CSS
TON
RON AGND
FB
PGND
CBST
RLIM
1
L1
CFF R1
R2
1.
Ordering Information - Back Page
VOUT
COUT
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)
Line Regulation
©2016-2017 Exar Corporation
1 / 20
exar.com/XR76203-Q/XR76205-Q/XR76208-Q
Rev 1C

1 page




XR76208-Q pdf
Pin Configuration, Top View
XR76203-Q/XR76205-Q/XR76208-Q
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
©2016-2017 Exar Corporation
5 / 20
exar.com/XR76203-Q/XR76205-Q/XR76208-Q
Rev 1C

5 Page





XR76208-Q arduino
XR76203-Q/XR76205-Q/XR76208-Q
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-Q 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-Q 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-Q 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-Q 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-Q efficiency, VIN=12V
100
98
96 200kHz
94 10uH
92 6.8uH
90 4.7uH
88
86
84 3.3uH
82
80
78
76
74
72
70
0.1
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-Q efficiency, VIN=24V
©2016-2017 Exar Corporation
11 / 20
exar.com/XR76203-Q/XR76205-Q/XR76208-Q
Rev 1C

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