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XR76205-Q Datasheet Preview

XR76205-Q Datasheet

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




Exar

XR76205-Q Datasheet Preview

XR76205-Q Datasheet

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

No Preview Available !

XR76203-Q/XR76205-Q/XR76208-Q
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause perma-
nent damage to the device. Exposure to any Absolute Max-
imum Rating condition for extended periods may affect
device reliability and lifetime.
PVIN, VIN.....................................................................-0.3V to 43V
VCC.............................................................................-0.3V to 6.0V
BST............................................................................-0.3V to 48V1
BST-SW.........................................................................-0.3V to 6V
SW, ILIM....................................................................-1V to 43V1, 2
ALL other pins...................................................-0.3V to VCC+0.3V
Storage Temperature............................................-65°C to +150°C
Junction Temperature............................................................150°C
Power Dissipation................................................Internally Limited
Lead Temperature (Soldering, 10 sec)..................................300°C
ESD Rating (HBM - Human Body Model)...............................±2kV
ESD Rating (Charged device model (CDM) per AEC Q100-011,
Non-corner pins...................................................................±500V
ESD Rating (Charged device model (CDM) per AEC Q100-011,
Corner pins 1, 7, 8, 14, 15, 22, 23, 30..................................±750V
Operating Conditions
PVIN.................................................................................5V to 40V
VIN................................................................................5.5V to 40V
SW, ILIM.......................................................................-1V to 40V1
PGOOD, VCC, TON, SS, EN, FB.................................-0.3V to 5.5V
Switching Frequency........................................100kHz to 800kHz3
Junction Temperature Range................................-40°C to +125°C
XR76203-Q Package Thermal Resistance, JA..................28°C/W
XR76205-Q Package Thermal Resistance, JA..................26°C/W
XR76208-Q Package Thermal Resistance, JA..................25°C/W
XR76203-Q Package Power Dissipation at 25°C....................3.6W
XR76205-Q Package Power Dissipation at 25°C....................3.8W
XR76208-Q Package Power Dissipation at 25°C....................4.0W
Note 1: No external voltage applied.
Note 2: SW pin’s minimum DC range is -1V, transient is -5V for less than
50ns.
Note 3: Recommended frequency
Electrical Characteristics
Unless otherwise noted: TJ= 25°C, VIN=24V, BST=VCC, SW=AGND=PGND=0V, CVCC=4.7uF. Limits applying over the full
operating temperature range are denoted by a “•”
Symbol
Parameter
Power Supply Characteristics
VIN Input Voltage Range
IVIN VIN Input Supply Current
IVIN VIN Input Supply Current (XR76203-Q)
IVIN VIN Input Supply Current (XR76205-Q)
IVIN VIN Input Supply Current (XR76208-Q)
IOFF Shutdown Current
Enable and Under-Voltage Lock-Out UVLO
VIH_EN_1 EN Pin Rising Threshold
VEN_H_1 EN Pin Hysteresis
VIH_EN_2 EN Pin Rising Threshold for DCM/CCM
operation
VEN_H_2 EN Pin Hysteresis
Conditions
VCC regulating
Not switching, VIN = 24V, VFB = 0.7V
f=300kHz, RON=215k, VFB=0.58V
f=300kHz, RON=215k, VFB=0.58V
f=300kHz, RON=215k, VFB=0.58V
Enable = 0V, VIN = 12V
Min Typ Max Units
5.5
40 V
0.7 2 mA
12 mA
15 mA
19 mA
1 μA
1.8 1.9 2.0
V
70 mV
2.8 3.0 3.1
V
100 mV
©2016-2017 Exar Corporation
2 / 20
exar.com/XR76203-Q/XR76205-Q/XR76208-Q
Rev 1C


Part Number XR76205-Q
Description 3A/5A/8A Synchronous Step Down COT Regulator
Maker Exar
Total Page 20 Pages
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