XR76112 반도체 회로 부품 판매점
8A and 12A Synchronous Step Down COT Regulator
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 Exar |
XR76108 and XR76112
PowerBlox™
8A and 12A Synchronous Step Down COT Regulator
General Description
The XR76108 and XR76112 are synchronous step-down
regulators combining the controller, drivers, bootstrap
diode and MOSFETs in a single package for point-of-load
supplies. The XR76108 has a load current rating of 8A and
the XR76112 has a load current rating of 12A. A wide 4.5V
to 22V input voltage range allows for single supply
operation from industry standard 5V, 12V and 19.6V rails.
With a proprietary emulated current mode Constant On-
Time (COT) control scheme, the XR76108 and XR76112
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 0.25% load and 0.1% line regulation and
maintains constant operating frequency. A selectable
power saving mode, allows the user to operate in
discontinuous 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, help achieve
safe operation under abnormal operating conditions.
The XR76108/12 are available in a RoHS-compliant,
green/halogen-free space-saving QFN 5x5mm package.
Typical Application
VIN
Enable/Mode
Power Good
CIN
R3
VIN PVIN
EN/MODE
BST
PGOOD
SW
VCC XR76108
XR76112
SS ILIM
CVCC
CSS
TON
RON
AGND
FB
PGND
CBST
RLIM
L1 VOUT
CFF R1
R2
COUT
Figure 1: XR76108/12 Application Diagram
FEATURES
8A and 12A Capable Step Down
Regulators
4.5V to 5.5V Low VIN Operation
4.5V to 22V Wide Single Input
Voltage
≥0.6V Adjustable Output Voltage
Controller, drivers, bootstrap diode and
MOSFETs integrated in one package
Proprietary Constant On-Time Control
No Loop Compensation Required
Ceramic Output Cap. Stable operation
Programmable 200ns-2µs On-Time
Constant 200kHz-800kHz Freq.
Selectable CCM or CCM/DCM
Operation
Precision Enable and Power-Good Flag
Programmable Soft-start
5x5mm 30-pin QFN Package
APPLICATIONS
Distributed Power Architecture
Point-of-Load Converters
Power Supply Modules
FPGA, DSP, and Processor Supplies
Base Stations, Switches/Routers, and
Servers
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
5
10 15 20
VIN (V)
Figure 2: XR76112 Line Regulation
©2013-2014 Exar Corporation
www.exar.com
Rev. 2A
XR76108 and XR76112
Absolute Maximum Ratings
These are stress ratings only and functional
operation of the device at these ratings or any
other above those indicated in the operation
sections of the specifications below is not
implied. Stresses beyond those listed under
Absolute Maximum Ratings may cause
permanent damage to the device. Exposure to
any Absolute Maximum Rating condition for
extended periods may affect device reliability
and lifetime.
PVIN, VIN .................................................... -0.3V to 25V
VCC .......................................................... -0.3V to 6.0V
BST ......................................................... -0.3V to 31V1
BST-SW ......................................................-0.3V to 6V
SW, ILIM .................................................... -1V to 25V1,2
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 (CDM – Charged Device Model) .............1.5kV
Operating Ratings
PVIN.............................................................. 3V to 22V
VIN .............................................................4.5V to 22V
VCC ............................................................4.5V to 5.5V
SW, ILIM ..................................................... -1V to 22V2
PGOOD, VCC, TON, SS, EN............................ -0.3V to 5.5V
Switching Frequency ............................. 200kHz-800kHz3
Junction Temperature Range (TJ) ..............-40°C to 125°C
XR76108 Package Power Dissipation max at 25°C..... 3.8W
XR76112 Package Power Dissipation max at 25°C..... 4.1W
XR76108 JEDEC51 Package Thermal Resistance θJA........ 26°C/W
XR76112 JEDEC51 Package Thermal Resistance θJA........ 24°C/W
Note 1: No external voltage applied
Note 2: SW pin’s DC range is -1V, transient is -5V for less
than 50ns
Note 3: Recommended
Ordering Information
Part Number
XR76108EL-F
XR76108ELMTR-F
XR76108ELTR-F
XR76112EL-F
XR76112ELMTR-F
XR76112ELTR-F
XR76108EVB
XR76112EVB
Temperature
Range
Marking Package
Packing
Quantity
-40°C≤TJ≤+125°C
76108E
YYWW
XXXXXX
76112E
YYWW
XXXXXX
5x5mm
QFN
XR76108 Evaluation Board
XR76112 Evaluation Board
Bulk
250/Tape & Reel
3K/Tape & Reel
Bulk
250/Tape & Reel
3K/Tape & Reel
“YY” = Year – “WW” = Work Week – “XXXXXX” = Lot Number; when applicable.
Note 1
RoHS Compliant
Halogen Free
Electrical Characteristics
Specifications are for Operating Junction Temperature of TJ = 25°C only; limits applying over the full
Operating Junction Temperature range are denoted by a “•”. Typical values represent the most likely
parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise
indicated, VIN=12V
Parameter
Min.
Power Supply Characteristics
VIN, Input Voltage Range
IVIN, VIN supply current
IVCC, VCC Quiescent current
IVIN, VIN supply current (XR76112)
4.5
4.5
Typ.
12
5.0
0.7
0.7
8
Max. Units
22
V
5.5
1.3 mA
1.3 mA
mA
Conditions
• VCC regulating or in dropout
VCC tied to VIN
• Not switching, VIN=12V, VFB=0.7V
• Not switching, VCC=VIN=5V, VFB=0.7V
f=300kHz, RON=107k, VFB=0.58V
© 2013-2014 Exar Corporation
2/17
www.exar.com
Rev. 2A
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( exar )
XR76112 regulator
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[ XR76112.PDF ]
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국내 전력반도체 판매점
상호 : 아이지 인터내셔날
전화번호 : 051-319-2877
[ 홈페이지 ]
IGBT, TR 모듈, SCR, 다이오드모듈, 각종 전력 휴즈
( IYXS, Powerex, Toshiba, Fuji, Bussmann, Eaton )
전력반도체 문의 : 010-3582-2743
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