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XR77128 Datasheet Preview

XR77128 Datasheet

Quad Output Digital PWM/PFM Universal PMIC

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XR77128
Quad Output Digital PWM/PFM
Universal PMIC
General Description
The XR77128 is a quad channel digital Pulse Width Modulated (PWM)
step down (buck) controller. A wide 4.75V to 5.5V and 5.5V to 25V input
voltage range allows for single supply operation from standard power
rails.
With integrated FET gate drivers, two LDOs for standby power and a
105kHz to 1.23MHz independent channel to channel programmable
constant operating frequency, the XR77128 reduces overall component
count, solution footprint and optimizes conversion efficiencies. A
selectable digital Pulse Frequency Mode (PFM) capable of better than
80% efficiency at light current load and low operating current allow for
portable and Energy Star compliant applications. Each XR77128
channel’s output voltage is individually programmable down to 0.6V with a
resolution of 2.5mV, and is configurable for precise soft start and soft stop
sequencing, including delay and ramp control.
The XR77128 operations are fully controlled via a SMBus-compliant I2C
interface allowing for advanced local and/or remote reconfiguration, full
performance monitoring and reporting as well as fault handling.
Built-in independent output Over-Voltage, Over-Temperature, Over-
Current and Under-Voltage Lockout protections insure safe operation
under abnormal operating conditions.
The XR77128 is offered in a RoHS compliant, “green”/halogen free 44-pin
TQFN package.
Typical Application
FEATURES
Quad Channel Step-down Controller
Digital PWM 105kHz-1.23MHz Operation
Individual Channel Frequency Selection
Patented digital PFM with Ultrasonic mode
Patented Over Sampling Feedback
Programmable 5 coefficient PID control
Integrated MOSFET Drivers
Supports DrMOS devices
4.75V to 5.5V and 5.5V to 25V Input Voltage
0.6V to 5.5V Output Voltage (higher with
external feedback resistors)
SMBus Compliant I2C Interface
Full Power Monitoring and Reporting
3 x 15V Capable PSIO + 2 x GPIOs
Full Start/Stop Sequencing Support
Built-in Thermal, Over-Current, UVLO and
Output Over-Voltage Protections
On Board 5V and LDOOUT Standby LDOs
On Board Non-Volatile Memory
Supported by PowerArchitect™ (PA5)
APPLICATIONS
Industrial Control Systems
Automatic Test Equipment
Video Surveillance Systems
Automotive Infotainment
Ordering Information – back page
1 / 29
exar.com/XR77128
Rev 1C




MaxLinear

XR77128 Datasheet Preview

XR77128 Datasheet

Quad Output Digital PWM/PFM Universal PMIC

No Preview Available !

XR77128
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause
permanent damage to the device. Exposure to any
Absolute Maximum Rating condition for extended periods
may affect device reliability and lifetime.
VCCD, LDO5, LDOOUT, GLx, VOUTx........................-0.3V to 7.0V
ENABLE, V5EXT.........................................................-0.3V to 7.0V
GPIO0/1, SCL, SDA.................................................................6.0V
PSIO Inputs, BFB......................................................................18V
DVDD, AVDD...........................................................................2.0V
VCC..........................................................................................28V
LX#.................................................................................-1V to 28V
BSTx, GHx........................................................................VLx + 6V
Storage Temperature.............................................-65°C to +150°C
Power Dissipation................................................Internally Limited
Lead Temperature (Soldering, 10 sec)..................................300°C
ESD Rating (HBM - Human Body Model).................................2kV
Operating Conditions
Input Voltage Range VCC.............................................5.5V to 25V
Input Voltage Range VCC = LDO5.............................4.75V to 5.5V
VOUT1, 2, 3, 4.........................................................................5.5V
Junction Temperature Range................................-40°C to +125°C
JEDEC Thermal Resistance JA.........................................32°C/W
Electrical Characteristics
Unless otherwise noted: TJ= 25°C, VCC = 5.5V to 25V, V5EXT open. Limits applying over the full operating temperature
range are denoted by a “•”
Symbol
Parameter
Quiescent Current
ISUPPLY
VCC Supply Current
Conditions
SHUTDOWN
EN = 0V, VCC = 12V
STANDBY
I/Os programmed as inputs, VCC = 12V,
EN = 5V
2ch PFM
2 channels on set at 5V, VOUT forced to
5.1V, no load, non-switching, ultra-sonic
off, VCC = 12V, no I2C activity
4ch PFM
4 channels on set at 5V, VOUT forced to
5.1V, no load, non-switching, ultra-sonic
off, VCC = 12V, no I2C activity
4ch PWM
All channels enabled, fsw = 600kHz, gate
drivers unloaded, no I2C activity
Min Typ Max
Units
10 20
550 650
µA
µA
3.1 mA
4.0 mA
18 mA
2 / 29
exar.com/XR77128
Rev 1C


Part Number XR77128
Description Quad Output Digital PWM/PFM Universal PMIC
Maker MaxLinear
Total Page 29 Pages
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