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XR79106 Datasheet Preview

XR79106 Datasheet

6A Synchronous Step-Down COT Power Module

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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
CIN RPGOOD
CVCC CSS
RON
VIN PVIN
EN/MODE
PGOOD
VOUT
VCC XR79106
SW
SS ILIM
TON
AGND
PGND
FB
RLIM
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
0123456
IOUT (A)
Figure 2. Efficiency, 12VIN
REV1B
1/19




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XR79106 Datasheet Preview

XR79106 Datasheet

6A Synchronous Step-Down COT Power Module

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XR79106
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 31V(1)
BST-SW.............................................................. -0.3V to 6V
SW, ILIM......................................................... -1V to 25V(1)(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 seconds)....... 260°C MSL3
ESD rating (HBM – human body model)........................ 2kV
ESD rating (CDM – charged device model)................... 2kV
Operating Conditions
PVIN.......................................................................3V to 22V
VIN......................................................................4.5V to 22V
SW, ILIM ........................................................ -1V to 22V(1)(2)
PGOOD, VCC, TON, SS, EN, FB.................... -0.3V to 5.5V
Switching frequency............................. 600kHz to 800kHz(3)
Junction temperature range (TJ).................. -40°C to 125°C
Package power dissipation max at 25°C...................... 4.3W
Package thermal resistance θJA............................... 23°C/W
NOTES:
1. No external voltage applied.
2. SW pin’s DC range is -1V, transient is -5V for less than 50ns.
3. Recommended frequency for optimum performance.
Electrical Characteristics
TJ = 25°C, VIN = 12V, BST = VCC, SW = AGND = PGND = 0V, CVCC = 4.7μF, unless otherwise specified. Limits applying
over the full operating temperature range are denoted by a •.
Symbol Parameter
Conditions
Power Supply Characteristics
VIN Input voltage range
VCC regulating or in dropout
VCC tied to VIN
IVIN
IVCC
IOFF
VIN supply current
VCC quiescent current
Shutdown current
Not switching, VFB = 0.7V
f = 500kHz, RON = 61.9kΩ, VFB = 0.58V
Not switching, VCC tied to VIN, VIN = 5V,
VFB = 0.7V
Enable = 0V, PVIN tied to VIN
Enable and Undervoltage Lock-Out (UVLO)
VIH_EN_1 EN pin rising threshold
VEN_HYS_1
VIH_EN_2
EN pin hysteresis
EN pin rising threshold for
DCM/CCM
VEN_HYS_2 EN pin hysteresis
VCC UVLO start threshold
VCC UVLO hysteresis
Rising edge
• Min Typ Max Units
• 4.5
22 V
• 4.5
5.5 V
• 0.7 2 mA
9 mA
• 0.7 2 mA
1 µA
• 1.8 1.9 2.0
60
• 2.8 3.0 3.1
110
• 4.00 4.25 4.40
• 150
200
V
mV
V
mV
V
mV
REV1B
2/19


Part Number XR79106
Description 6A Synchronous Step-Down COT Power Module
Maker Exar
Total Page 19 Pages
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