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XR76121 Datasheet

20A Synchronous Step-Down COT Regulators

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XR76121
PowerBloxTM 20A Synchronous
Step-Down COT Regulators
Description
The XR76121 is a synchronous step-down regulator combining the
controller, drivers, bootstrap diode and MOSFETs in a single package
for point-of-load supplies. The XR76121 has a load current rating
of 20A. A wide 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 XR76121 provides 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 0.1% 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 overcurrent, over temperature,
overvoltage, short-circuit, open feedback detect and UVLO, helps
achieve safe operation under abnormal operating conditions.
The XR76121 is available in a RoHS compliant, green/halogen-free
space-saving 5mm x 6mm QFN package.
Typical Application
ENABLE
VIN
POWER GOOD
CIN R
CBST
EN BST
VIN SW
RLIM
PVIN ILIM
PGOOD
VCC
XR76121
FB
SS FCCM
CVCC CSS
TON
RON
AGND
VSNS
PGND
L1
CFF
RFF
VOUT
R1
R2
VOUT
R1
COUT
R2
Figure 1. Typical Application
FEATURES
■■ 20A step-down regulator
4.5V to 5.5V low VIN operation
5V to 22V wide single input voltage
3V to 22V operation with external
5V bias
≥0.6V adjustable output voltage
■■ Proprietary constant on-time control
No loop compensation required
Ceramic output capacitor stable
operation
Programmable 70ns-1µs on-time
Constant 200kHz-1MHz frequency
Selectable CCM or CCM/DCM
operation
■■ Power-good flag with low impedance when
power removed
■■ Precision enable
■■ Programmable soft-start
■■ 5mm x 6mm QFN package
APPLICATIONS
■■ Servers
■■ Distributed power architecture
■■ Point-of-load converters
■■ FPGA, DSP and processor supplies
■■ Base stations, switches/routers
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
600kHz
800kHz
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
5.1 10.1 15.1 20.1
IOUT (A)
Figure 2. Efficiency
REV1A
1/18




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XR76121 Datasheet Preview

XR76121 Datasheet

20A Synchronous Step-Down COT Regulators

No Preview Available !

XR76121
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 second)................... 300°C
ESD rating (HBM – human body model)........................ 2kV
ESD rating (CDM – charged device model)................... 1kV
ESD rating (MM – machine model).............................. 200V
Operating Conditions
PVIN.......................................................................3V to 22V
VIN......................................................................4.5V to 22V
VCC....................................................................4.5V to 5.5V
SW, ILIM ...........................................................-1V to 22V(2)
PGOOD, TON, SS, EN..................................-0.3V to 5.5V(2)
Switching frequency.................................... 200kHz-1MHz(3)
Junction temperature range (TJ).................. -40°C to 125°C
Package power dissipation max at 25°C...................... 4.1W
Package thermal resistance θJA..................................... 24°C/W(4)
NOTES:
1. No external voltage applied.
2. SW pin’s DC range is -1V, transient is -5V for less than 50ns.
3. Recommended.
4. Measured on Exar evaluation board.
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, SW = AGND = PGND = 0V, CVCC = 4.7uF.
Symbol
Parameter
Conditions
• Min Typ Max Units
Power Supply Characteristics
VIN Input voltage range
IVIN
IVCC
VIN supply current
VCC quiescent current
IVIN VIN supply current
IOFF Shutdown current
Enable and Undervoltage Lock-Out UVLO
VCC regulating
VCC tied to VIN
Not switching, VIN = 12V, VFB = 0.7V
Not switching, VCC = VIN = 5V,
VFB = 0.7V
f = 600kHz, RON = 49.9k,
VFB = 0.58V
Enable = 0V, PVIN = VIN = 12V
VIH_EN
VEN_HYS
EN pin rising threshold
EN pin hysteresis
VCC UVLO start threshold, rising edge
VCC UVLO hysteresis
5
4.5
1.8
4.00
100
12
5.0
0.8
0.8
17
1
1.9
60
4.25
170
22
5.5
1.3
1.3
2.0
4.40
V
mA
mA
mA
μA
V
mV
V
mV
REV1A
2/18


Part Number XR76121
Description 20A Synchronous Step-Down COT Regulators
Maker Exar
Total Page 18 Pages
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