XR76208EL-Q Datasheet, PDF (1/21 Pages) Exar Corporation – AEC-Q100 Qualified 40V PowerBloxTM 3A/5A/8A Synchronous Step Down COT Regulator

XR76203-Q/XR76205-Q/XR76208-Q
AEC-Q100 Qualified 40V PowerBlox^TM
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
V_IN
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
V_IN (V)
Line Regulation
©2016-2017 Exar Corporation
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exar.com/XR76203-Q/XR76205-Q/XR76208-Q
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