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PDF XR76112 Data sheet ( Hoja de datos )
| Número de pieza | XR76112 | |
| Descripción | 8A and 12A Synchronous Step Down COT Regulator | |
| Fabricantes | Exar | |
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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
1 page  
XR76108 and XR76112
Pin Assignment
BST SW PVIN PVIN PVIN PVIN PVIN PVIN
30 29 28 27 26 25 24 23
ILIM 1
EN 2
TON 3
SS 4
PGOOD 5
FB 6
AGND 7
PVIN PAD
AGND PAD
SW PAD
8 9 10 11 12 13 14
VIN VCC AGND SW SW SW SW
Figure 4: XR76108/12 Pin Assignment
22 PVIN
21 PVIN
20 SW
19 PGND
18 PGND
17 PGND
16 PGND
15 PGND
© 2013-2014 Exar Corporation
5/17
www.exar.com
Rev. 2A
5 Page 
XR76108 and XR76112
Thermal Characteristics
No Air flow, f=600kHz
TAMBIENT vs IOUT
130
120
110
100
90 1.2
80
1.8
70
60 3.3
50
12345678
IOUT (A)
Figure 29: XR76108 Package Thermal Derating, 12VIN
TAMBIENT vs IOUT
130
120
110
100
90 1.2
80
1.8
70
60 3.3
50
12345678
IOUT (A)
Figure 30: XR76108 Package Thermal Derating, 5VIN
TAMBIENT vs IOUT
130
120
110
100
90 1.2
80
1.8
70
60 3.3
50
1 2 3 4 5 6 7 8 9 10 11 12
IOUT (A)
Figure 31: XR76112 Package Thermal Derating, 12VIN
TAMBIENT vs IOUT
130
120
110
100
90 1.2
80
1.8
70
60 3.3
50
1 2 3 4 5 6 7 8 9 10 11 12
IOUT (A)
Figure 32: XR76112 Package Thermal Derating, 5VIN
© 2013-2014 Exar Corporation
11/17
www.exar.com
Rev. 2A
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet XR76112.PDF ] | |
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