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PDF XRP7704 Data sheet ( Hoja de datos )
| Número de pieza | XRP7704 | |
| Descripción | Quad-Output Digital PWM Buck Controller | |
| Fabricantes | Exar | |
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XRP7704www.DataSheet4U.com
Quad-Output Digital PWM Buck Controller
September 2009
GENERAL DESCRIPTION
The XRP7704 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 the included 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 6.5V to 20V.
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 for soft-start and soft-
stop. The start-up delay and ramp of each PWM regulator
can be independently controlled. The device can start up a
pre-biased PWM channel without causing large negative
inductor current.
APPLICATIONS
Computing: Servers, Storage Systems
Consumer: Set-top box (STB), Game Systems
Industrial: ATE, DC-DC converters, Video Processing
Plasma Display Panel (PDP)
Networking and Telecommunications Equipment
REV 1.1.0
KEY FEATURES
Four switching buck (step-down) controllers each with
internal FET drivers
6.5V to 20V input voltage range – no additional voltage
rails required
Output voltages programmable from 0.9V to 5.1V
Up to 6 reconfigurable GPIO pins
Fully programmable via I2C interface
Independent Digital Pulse Width Modulator (DPWM)
channels with five coefficient PID control
High Integration: elimination of external circuits and
components required for compensation, parameter
adjustment and interface
Programmable DPWM frequency range (300 kHz to 1.5
MHz) enables efficiency and component size optimization
Complete power monitoring and reporting
Independently controlled start-up delay and ramp for each
regulator, including soft start with a pre-biased load
voltage
Independently controlled soft-stop delay and ramp for
each regulator with a programmable stop voltage
Over-temperature protection (OTP) and Under Voltage
Lockout (UVLO); per-channel over-current protection
(OCP) and over-voltage protection (OVP)
Built-in LDO (configurable to 3.3V or 5V) with over-current
protection
Non-volatile memory for system configuration
Configuration development tools
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
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REV 1.1.0
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XRP7704
Quad-Output Digital PWM Buck Controller
XRP7704 INTERNAL BLOCK DIAGRAM
VOUT1
PreScaler
Vtar
DAC
Feedback
ADC
Channel 1
Digital
PID
Hybrid
DPWM
SS & PD
Delay
Gate
Driver
BST1
GH1
LX1
GL1
PGND1
Current
ADC 1
2-CH
MUX
VOUT2
PreScaler
Vtar
DAC
Feedback
ADC
Channel 2
Digital
PID
–
Hybrid
DPWM
SS & PD
6
Dead
Time
Gate
Driver
BST2
GH2
LX2
GL2
PGND2
VOUT3
VOUT4
VCC
VDD
GPIO 0-3
SDA,SCL
LDO
GPIO
I2C
Channel 3
Current
ADC 2
2-CH
MUX
VCCD
Channel 4
VREF
OSC
OTP
Fault
Handling
CLOCK
PWR
Good
AUX ADC
UVLO
Configuration
Registers
7-CH
MUX
Vout1
Vout2
Vout3
Vout4
Vtj
VIN2
VIN1
STBY LR
LDOOUT
EXAR CONFIDENTIAL. PROPRIETARY. DO NOT DISTRIBUTE OR COPY.
5
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REV 1.1.0
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XRP7704
Quad-Output Digital PWM Buck Controller
APPLICATION INFORMATION (Cont)
CH1:3.3V CH2:5V CH3:1V CH4:1.8V
Simultaneous Start-up Configuration
CH1:3.3V CH2:5V CH3:1V CH4:1.8V
Simultaneous Soft-Stop
CH1:3.3V CH2:5V CH3:1V CH4:1.8V
Sequential Start-up Configuration
CH1:5V CH2:3.3V CH3:1.8V CH4:1.2V
Sequential Soft-Stop Configuration
Vout Shutdown = 0.8V, 3A load
CH1: Vout (5V)
Startup into 3V prebias - 5V output
CH1:3.3V CH2:5V CH3:1V CH4:1.8V
Sequential Soft-Stop Configuration
Vout Shutdown = 0.8V, No load
EXAR CONFIDENTIAL. PROPRIETARY. DO NOT DISTRIBUTE OR COPY.
11
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet XRP7704.PDF ] | |
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