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XR76205 Datasheet Preview

XR76205 Datasheet

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




Exar

XR76205 Datasheet Preview

XR76205 Datasheet

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

No Preview Available !

XR76203/5/8
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
Operating Conditions
PVIN...............................................................................5V to 40V
VIN.................................................................................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 JEDEC51 Package Thermal Resistance, JA...............28°C/W
XR76205 JEDEC51 Package Thermal Resistance, JA...............26°C/W
XR76208 JEDEC51 Package Thermal Resistance, JA...............25°C/W
XR76203 Package Power Dissipation at 25°C......................3.6W
XR76205 Package Power Dissipation at 25°C......................3.8W
XR76208 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
Conditions
Power Supply Characteristics
VIN Input Voltage Range
IVIN VIN Input Supply Current
IVIN VIN Input Supply Current (XR76203)
IVIN VIN Input Supply Current (XR76205)
IVIN VIN Input Supply Current (XR76208)
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
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
0.7 2
12
15
19
1
V
mA
mA
mA
mA
μA
1.8 1.9 2.0
70
2.8 3.0 3.1
100
V
mV
V
mV
© 2015 Exar Corporation
2 / 20
exar.com/XR76203/5/8
Rev 1A


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