XRP7708_12 Datasheet, PDF (2/28 Pages) Exar Corporation – Quad Channel Digital PWM Step Down Controllers

XRP7708 and XRP7740
Quad Channel Digital PWM Step Down Controllers
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
VCCA, VCCD, LDOOUT, GLx, VOUTx............................ 6V
AVDD, DVDD ........................................................ 2.0V
VIN1, VIN2 ............................................................ 22V
LXx..............................................................-1V to 22V
Logic Inputs............................................................. 6V
BSTx, GHx.................................................... VLXx + 5V
Storage Temperature .............................. -65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
OPERATING RATINGS
Operating Input Voltage VINX ........................6.5V to 20V
Junction Temperature Range ....................-40°C to 125°C
Thermal Resistance θJA ....................................24.3°C/W
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of TJ = 25°C only; limits applying over the full
Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for
reference purposes only. Unless otherwise indicated, VIN1 = 6.5V to 20V, VIN2 = 6.5V to 20V, Enable=HIGH,
CGL = CGH = 1nF.
Quiescent Current
Parameter
Min.
VIN Supply Current in STANDBY
VIN Supply Current in
SHUTDOWN
VIN Supply Current
Typ.
9
180
28
Max.
Units
mA
µA
mA
VIN Supply Current
50
mA
Conditions
LDOOUT enabled (no load)
No switching converter channels enabled
I²C communication active
Switching frequency = 400kHz
EN=0V, VIN1=VIN2=12V
4 channels running,
GH and GH = 1nF load each
VIN=12V, Switching frequency = 300kHz
4 channels running,
GH and GH = 1nF load each
VIN=12V, Switching frequency = 1MHz
Step Down Controllers
Parameter
VOUT Regulation Accuracy
VOUT regulation range
VOUT set point resolution
VOUT set point resolution
VOUT Input Current
VOUT Input Resistance
Min.
-20
-40
0.9
Typ.
50
100
120
Max.
20
40
5.1
1
Units
mV
mV
uA
kΩ
Conditions
• 0.9V ≤ VOUT ≤ 2.5V
• 2.6V ≤ VOUT ≤ 5.1V
• Programmable range of each channel¹
0.9V ≤ VOUT ≤ 2.5V
2.6V ≤ VOUT ≤ 5.1V
• 0.9V < VOUT <= 2.5V
2.6V ≤ VOUT ≤ 5.1V
Note 1: Voltages above 5.1V can be obtained by using an external voltage divider.
© 2012 Exar Corporation
2/28
Rev. 1.2.2