XR79110 Module Datasheet

XR79110 Datasheet, PDF, Equivalent


Part Number

XR79110

Description

10A Synchronous Step Down COT Power Module

Manufacture

Exar

Total Page 20 Pages
Datasheet
Download XR79110 Datasheet


XR79110
XR79110
22V, 10A Synchronous Step Down COT Power Module
General Description
The XR79110 is a 10A synchronous step-down Power Module for point-of
load supplies. 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) con-
trol scheme, the XR79110 provides extremely fast line and load transient
response using ceramic output capacitors. It requires no loop compensa-
tion hence simplifying circuit implementation and reducing overall compo-
nent count. The control loop also provides 0.35% 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. With a 96% peak efficiency and 90% for loads as low as
100mA, the XR79110 is suitable for applications where low power losses
are important.
A host of protection features, including over-current, over-temperature,
short-circuit and UVLO, help achieve safe operation under abnormal
operating conditions.
The XR79110 is available in a RoHS compliant, green/halogen free
space-saving 72-pin 10x10x4mm QFN package with a 260°C lead solder
temperature. With integrated controller, drivers, bootstrap diode and
capacitor, MOSFETs, inductor, CIN and COUT, this solution allows the
smallest possible 10A POL design.
FEATURES
Controller, drivers, bootstrap diode and capaci-
tor, MOSFETs, Inductor, CIN and COUT integrated
in one package
10A Step Down Module
Wide 4.5V to 22V Input Voltage Range
>0.6V Adjustable Output Voltage
Proprietary Constant On-Time Control
No Loop Compensation Required
Stable Ceramic Output Capacitor Operation
Programmable 200ns to 2μs On-Time
Constant 400kHz to 600kHz Frequency
Selectable CCM or CCM/DCM
CCM/DCM for high efficiency at light-load
CCM for constant frequency at light-load
Programmable Hiccup Current Limit with Ther-
mal Compensation
Precision Enable and Power Good flag
Programmable Soft-start
72-pin 10x10x4mm QFN package 260°C solder
temperature
APPLICATIONS
Networking and Communications
Fast Transient Point-of-Loads
Industrial and Medical Equipment
Embedded High Power FPGA
Ordering Information – back page
Typical Application
VIN
Enable/Mode
Power Good
CIN
R3
VIN PVIN
EN/MODE
PGOOD
VOUT
VCC XR79110 SW
SS ILIM
CVCC
CSS
TON
RON
AGND
FB
PGND
RLIM
Line Regulation
1.220
1.215
VOUT
1.210
1.205
1.200
R1 1.195
COUT
1.190
R2 1.185
1.180
4 6 8 10 12 14 16 18 20 22
VIN (V)
© 2015 Exar Corporation
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exar.com/XR79110
Rev 2A

XR79110
XR79110
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause perma-
nent damage to the device. Exposure to any Absolute Max-
imum 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 31V1
BST-SW.......................................................................-0.3V to 6V
SW, ILIM...................................................................-1V to 25V1, 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 sec)......................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
VCC............................................................................4.5V to 5.5V
SW, ILIM.....................................................................-1V to 22V1
PGOOD, VCC, TON, SS, EN, FB...............................-0.3V to 5.5V
Switching Frequency......................................400kHz to 600kHz3
Junction Temperature Range..............................-40°C to +125°C
JEDEC51 Package Thermal Resistance, JA................18.1°C/W
Package Power Dissipation at 25°C.......................................5.5W
Note 1: No external voltage applied.
Note 2: SW pin’s minimum DC range is -1V, transient is -5V for less than
50ns.
Note 3: Recommended frequency for optimum performance
Electrical Characteristics
Unless otherwise noted: TJ= 25°C, VIN=12V, BST=VCC, SW=AGND=PGND=0V, CVCC=4.7uF. Limits applying over the full
operating temperature range are denoted by a “•”
Symbol
Parameter
Conditions
Min Typ Max
Power Supply Characteristics
VIN Input Voltage Range
VCC regulating or in dropout
VCC tied to VIN
4.5
4.5
22
5.5
IVIN
IVCC
VIN Input Supply Current
VCC Quiescent Current
Not switching, VIN = 12V, VFB = 0.7V
Not switching, VCC=VIN = 5V, VFB = 0.7V
0.7 2
0.7 2
IVIN VIN Input Supply Current
f=500kHz, RON=61.9k, VFB=0.58V
11
IOFF Shutdown Current
Enable = 0V, VIN = 12V
1
Enable and Under-Voltage Lock-Out UVLO
VIH_EN
EN Pin Rising Threshold
1.8 1.9 2.0
VEN_HYS
VIH_EN
EN Pin Hysteresis
EN Pin Rising Threshold for DCM/
CCM operation
50
2.8 3.0 3.1
VEN_HYS EN Pin Hysteresis
100
Units
V
mA
mA
mA
μA
V
mV
V
mV
© 2015 Exar Corporation
2 / 20
exar.com/XR79110
Rev 2A


Features XR79110 22V, 10A Synchronous Step Down C OT Power Module General Description Th e XR79110 is a 10A synchronous step-dow n Power Module for point-of load suppli es. A wide 4.5V to 22V input voltage ra nge allows for single supply operation from industry standard 5V, 12V, and 19. 6V rails. With a proprietary emulated c urrent mode Constant On-Time (COT) cont rol scheme, the XR79110 provides extrem ely fast line and load transient respon se using ceramic output capacitors. It requires no loop compensation hence sim plifying circuit implementation and red ucing overall component count. The cont rol loop also provides 0.35% load and 0 .1% line regulation and maintains const ant operating frequency. A selectable p ower saving mode allows the user to ope rate in discontinuous mode (DCM) at lig ht current loads thereby significantly increasing the converter efficiency. Wi th a 96% peak efficiency and 90% for lo ads as low as 100mA, the XR79110 is sui table for applications where low power losses are important. A .
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