XR79106 Datasheet, PDF (1/19 Pages) Exar Corporation – 22V, 6A Synchronous Step-Down

XR79106
22V, 6A Synchronous Step-Down
COT Power Module
Description
The XR79106 is part of a family of 22V synchronous step-down
power modules combining the controller, drivers, inductor, passive
components and MOSFETs in a single package for point-of-load
supplies. This module requires very few external components leading
to ease of design and fast time to market. The XR79106 has load
current rating of 6A. 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 XR79106 provides extremely fast line and load
transient response using ceramic output capacitors. It requires no
loop compensation, simplifying circuit implementation and reducing
overall component count. The control loop also provides 0.2% load
and 0.2% line regulation and maintains constant operating frequency.
A selectable power saving mode, allows the user to operate in
Discontinuous Current Mode (DCM) at light current loads significantly
increasing the converter efficiency.
A host of protection features, including overcurrent, over temperature,
short-circuit and UVLO, helps achieve safe operation under abnormal
operating conditions.
The XR79106 is available in a RoHS-compliant, green/halogen-free
space-saving 8mm x 8mm x 4mm QFN package.
Typical Application
FEATURES
■■ 6A step-down power module
4.5V to 22V wide single input voltage
≥0.6V adjustable output voltage
■■ Controller, drivers, inductor, passive
components and MOSFETs integrated in
one package
■■ Proprietary constant on-time control
No loop compensation required
Stable with ceramic output capacitors
Programmable 100ns to1µs on-time
Constant 600kHz to 800kHz frequency
Selectable CCM or DCM/CCM
operation
■■ Precision enable and power-good flag
■■ Programmable soft-start
■■ 8mm x 8mm x 4mm QFN package
APPLICATIONS
■■ FPGA, DSP and processor supplies
■■ Distributed power architecture
■■ Point-of-load converters
■■ Power supply modules
■■ Base stations
■■ Switches and routers
■■ Servers
VIN
ENABLE/MODE
POWER GOOD
VIN
EN/MODE
PGOOD
PVIN
VOUT
CIN
RPGOOD
VCC
SW
XR79106
RLIM
SS
ILIM
CVCC CSS
TON
AGND
RON
FB
PGND
Figure 1. Typical Application
VOUT
RFB1
RFB2
COUT
100
800kHz
95
90
85
80
600kHz
5.0V
75
3.3V
2.5V
1.8V
70
1.5V
1.2V
1.0V
65
0
1
2
3
4
5
6
IOUT (A)
Figure 2. Efficiency, 12V_IN
REV1B
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