X
X
R
R
P
P
7
7
7
7
0
0
8
8
a
a
n
n
d
d
X
X
R
R
P
P
7
7
7
7
4
4
0
0
Q
Q
u
u
a
a
d
d
C
C
h
h
a
a
n
n
n
n
e
e
l
l
D
D
i
i
g
g
i
i
t
t
a
a
l
l
P
P
W
W
M
M
S
S
t
t
e
e
p
p
D
D
o
o
w
w
n
n
C
C
o
o
n
n
t
t
r
r
o
o
l
l
l
l
e
e
r
r
s
s
?2012 Exar Corporation
11/28
Rev. 1.2.2
FEATURES AND BENEFITS
General DPWM Benefits:
" Eliminate temperature and time variations associated
with passive components in:
Output set point
Feedback compensation
Frequency set point
Under voltage lock out
Input voltage measurement
Gate drive dead time
" Tighter parameter tolerances including operating
frequency set point
" Easy configuration and re-configuration for different
Vout, Iout, Cout, and Inductor selection by simply
changing internal PID coefficients. No need to change
external passives for a new output specification.
" Higher integration: Many external circuits can be
handled by monitoring or modifying internal registers
" Selectable DPWM frequency and Controller Clock
Frequency
Other Benefits:
" A single voltage is needed for regulation [no External
LDO required].
" I
2
C interface allows:
Communication with a System Controller or other
Power Management devices for optimized system
function
Access to modify or read internal registers that
control or monitor:
Output Current
Input and Output Voltage
Soft-Start/Soft-Stop Time
Power Good
Part Temperature
Enable/Disable Outputs
Over Current
Over Voltage
Temperature Faults
Adjusting fault limits and disabling/enabling
faults
" 6 Configurable GPIO pins, (4 if I
2
C is in use). Pins can
be configured in several ways:
Fault reporting (including OCP, OVP, Temperature,
Soft-Start in progress, Power Good)
Allows a Logic Level interface with other non-digital
ICs or as logic inputs to other devices
Possible to configure as traditional enable pin for
all 4 outputs
2 GPIOs can be dedicated to the I
2
C Interface as
required by the customers design
" Frequency and Synchronization Capability
Selectable switching frequency between 300kHz and
1.5MHz
Each output can be programmed to any one of 4
possible phases
Both internal clock and DPWM clock can be
synchronized to external sources
Master, Slave and Stand-alone Configurations
are possible
" Internal MOSFET Drivers
Internal FET drivers for each Channel: 3?1.8?for
XRP7740 and 5?1.8?for XRP7708
Built-In Automatic Dead-time adjustment
30ns Rise and Fall times
Soft-start into a pre-biased load and Soft-stop with
programmable endpoint voltage
" PowerArchitect" Design and Configuration Software:
In its simplest form only VIN, VOUT, and Iout for
each channel is required.
The software calculates configuration register
content based upon customer requirements. PID
coefficients for correct loop response (for automatic
or customized designs) can be generated and sent
to the device.
Configurations can be saved and/or recalled
GPIOs can be configured easily and intuitively
Synchronization configuration can be adjusted
Interface can be used for real-time debugging and
optimization
" Customizing XRP7708/40 with customer parameters
Once a configuration is finalized it can be sent to
EXAR and can reside in pre-programmed parts that
customers can order with an individual part number.
Allows parts to be used without I
2
C interface
System Benefits:
" Reliability is enhanced via communication with the
system controller which can obtain real time data on
an output voltage, input voltage and current.
" System processors can communicate with the
XRP7708/40 directly to obtain data or make
adjustments to react to circuit conditions
" A system process or could also be configured to log
and analyze operating history, perform diagnostics and
if required, take the supply off-line after making other
system adjustments.
" If customer field service is a possibility for your end
product, parameter reporting and history would
provide additional capabilities for troubleshooting or
aid in future system upgrades.
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