XRP7714_1009 Datasheet, PDF (1/29 Pages) Exar Corporation – Quad Channel Digital PWM Step Down Controller

September 2010
XRP7714
Quad Channel Digital PWM Step Down Controller
Rev. 1.1.4
GENERAL DESCRIPTION
The XRP7714 is a quad-output pulse-width
modulated (PWM) step-down DC-DC controller
with a built-in LDO for standby power and
GPIOs. The device provides a complete power
management solution in one IC and is fully
programmable via an I²C serial interface.
Independent Digital Pulse Width Modulator
(DPWM) channels regulate output voltages
and provide all required protection functions
such as current limiting and over-voltage
protection.
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 300 KHz to 1.5 MHz) enables the user to
optimize between efficiency and component
size. Input voltage range is from 4.75V to
25V. An I²C bus interface is provided to
program the IC as well as to communicate
with the host for fault reporting and handling,
power rail parameters monitoring, etc.
The device offers a complete solution including
independently programmable: soft-start, soft-
stop, start-up delay and ramp of each PWM
regulator.
APPLICATIONS
• Multi Channel Power Supplies
• Audio-Video Equipments
• Industrial & Telecom Equipments
• Processors & DSPs Based Equipments
FEATURES
• 4 x 5A Channel Step Down Controller
− Programmable Output Voltage 0.9V-5.1V
− Programmable 1.5MHz DPWM Frequency
− Integrated FET Drivers
• 4.75V to 5.5V and 5.5V to 25V Input
Voltage Range
• Up to 6 Reconfigurable GPIO Pins
• Fully Programmable via I²C Interface
• Independent Digital Pulse Width
Modulator (DPWM) channels
• Complete Monitoring and Reporting
• Complete Power Up/Down Sequencing
• Full On Board Protection
OTP, UVLO, OCP and OVP
• Built-in 3.3V/5V LDO
• PowerArchitect™ Design Software
• Green/Halogen Free 40-pin TQFN
TYPICAL APPLICATION DIAGRAM
VIN: 4.75 TO 25V
Vout1
LX1
LDO OUT
C8
GPIO0
GPIO1
GPIO2
GPIO3
SDA
I2C
SCL
ENABLE
VCCA
Vin
C3
GL1
GH1
C5
1 _AVDD
2 _DVDD
3 _GPIO0
4 _GPIO1
5 _GPIO2
6 _GPIO3
7 _{GPIO4_SDA}
8 _{GPIO5_SCL}
9 _ENABLE
10 _DGND
U1
XRP7714
Exposed Pad: DGND
GL2 ³⁰
LX2 ²⁹
GH2 ²⁸
BST2 ²⁷
VCCD ²⁶
BST4 ²⁵
GH4 ²⁴
LX4 ²³
GL4 ²²
PGND4 ²¹
Vout4 _GL3
Vout3
Vout2
GH3
C4 _D1
GL2
Q1
C1
GH1
GL1
LX1
VCCD
Vin
C6
LX2
GH2
Q3
GL2
LX2
GH2
C9
D2
R1
C10
D3
GH4
C11 ^ENABLE
LX4
VCCD
VCCA
Vin
LX4
R2
C14
Q5
GH4
C12
GL4
GL4
D4
C17
VCCD
LX3
Vin
C15
LX3
Q7
GH3
GL3
L1
Q2
Vout2
L2
Q4
Vout4
L3
Q6
Vout3
L4
Q8
Vout1
VOUT1
C2
VOUT2
C7
VOUT4
C13
VOUT3
C16
Fig. 1: XRP7714 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]