XR79206EL-F Datasheet, PDF (1/20 Pages) Exar Corporation – 40V, 6A Synchronous Step-Down COT Power Module

XR79206
40V, 6A Synchronous Step-Down
COT Power Module
Description
The XR79206 is part of a family of 40V 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 XR79206 has load
current rating of 6A. A wide 5V to 40V input voltage range allows for
single supply operation from industry standard 24V ±10%, 18V to 36V
and rectified 18VAC and 24VAC rails.
With a proprietary emulated current mode Constant On-Time (COT)
control scheme, the XR79206 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 0.1% 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, help achieve safe operation under abnormal
operating conditions.
The XR79206 is available in a RoHS-compliant, green/halogen-free
space-saving 10mm x 10mm x 4mm QFN package.
Typical Application
FEATURES
■■ 6A step-down power module
5V to 40V 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 to 1µs on-time
Constant 400kHz to 800kHz frequency
Selectable CCM or DCM/CCM
operation
■■ Precision enable and power-good flag
■■ Programmable soft-start
■■ 10mm x 10mm x 4mm QFN package
APPLICATIONS
■■ Drones and remote vehicles
■■ Automotive displays
■■ FPGA/DSP/processor supplies
■■ Industrial control and automation
■■ Telecommunications and infrastructure
equipment
■■ Distributed power architecture
VIN
ENABLE/MODE
POWER GOOD
VIN
EN/MODE
PGOOD
PVIN
VOUT
CIN
RPGOOD
VCC
SW
XR79206
RLIM
SS
ILIM
CVCC CSS
TON
AGND
RON
FB
PGND
VOUT
CFF
RFF RFB1
RFB2
COUT
Figure 1. Typical Application
REV1B
100
95
90
85
80
75
70
65
60
0
700kHz
500kHz
12.0V
5.0V
3.3V
1.8V
123456
IOUT (A)
Figure 2. Efficiency, 24V_IN
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