XRP7714ILB-F Exar Corporation, XRP7714ILB-F Datasheet - Page 12

• Manufacturer Part Number: XRP7714ILB-F
• Description: IC CTRLR PWM/LDO STP-DWN 40TQFN
• Manufacturer: Exar Corporation
• Type: Step-Down (Buck)r

Specifications of XRP7714ILB-F

• Number Of Outputs: 4
• Package / Case: 40-WFQFN Exposed Pad
• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Voltage - Output: 0.9 ~ 5.1 V
• Frequency - Switching: 300kHz ~ 1.5MHz
• Voltage - Input: 4.75 ~ 25 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Switching Frequency: 300 KHz
• Operating Supply Voltage: 4.75 V to 25 V
• Supply Current: 28 mA to 50 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Output Voltage: 0.9 V to 5.1 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 1016-1350 - EVAL BAORD FOR XRP77141016-1344 - IN-SOCKET PROG BRD VIA USB/GUI
• Current - Output: -
• Power - Output: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 1016-1351

FUNCTIONAL DESCRIPTION AND OPERATION
The XRP7714 is a quad-output digital pulse width modulation (DPWM) controller with integrated
gate drivers for the use in synchronous buck switching regulators. Each output voltage can be
programmed from 0.9V to 5.1V without the need of an external voltage divider. The wide range of
the programmable DPWM switching frequency (from 300kHz to 1.5MHz) enables the user to
optimize for efficiency or component sizes. The digital regulation loop requires no external passive
components for network compensation. The loop performance does not need to be compromised
due to component tolerance, aging, and operating condition. Each digital controller provides a
number of safety features, such as over-current protection (OCP) and over-voltage protection
(OVP).
(UVLO) for two input voltage rails. The XRP7714 also has up to 6 GPIOs and a Standby Linear
Regulator to provide standby power. An I
to communicate with the host for fault reporting and handling, power rail monitoring, channel
enable and disable, Standby LDO voltage reconfiguration, and Standby LDO enable and disable.
The XRP7714 offers a complete solution for soft-start and soft-stop. The delay and ramp of each
PWM regulator can be independently controlled. During soft-stop, the output voltage ramps down
with a programmable slope until it reaches a pre-set value. This pre-set value can be programmed
between within zero volts and the target voltage with the same set target voltage resolution.
R
There are two types of registers in the XRP7714: read/write registers and read-only registers. The
read/write registers are used for the control functions of the IC and can be programmed using
configuration non-volatile memory (NVM) or through an I
for feedback functions such as error/warning flags and for reading the output voltage or current.
N
The non-volatile memory (NVM) in XRP7714 stores the configuration data for the chip and all of the
power rails. This memory is normally configured during manufacturing time. Once a specific bit of
the NVM is programmed, that bit can never be reprogrammed again [i.e. one-time programmable].
During chip power up, the contents in the NVM are automatically transferred to the internal
registers of the chip. Programmed cells have been verified to be permanent for at least 10 years
and are highly reliable.
C
The figure below shows the power-up sequence of XRP7714 during the normal operation. The
startup stage is divided into three phases. The first phase is the internal LDO power-up phase. The
second phase is the configuration transfer phase. The third phase is chip ready phase. The power
up sequence is less than 1ms.
© 2010 Exar Corporation
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The chip also provides over-temperature protection (OTP) and under-voltage lock-out
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