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Exar - 3A/5A/8A Synchronous Step Down COT Regulator

Numéro de référence XR76205-Q
Description 3A/5A/8A Synchronous Step Down COT Regulator
Fabricant Exar 
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XR76205-Q fiche technique
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
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