SSPP77666633
TM
TM
PPoowweerrbbllooxx
6A 600KHz Synchronous Step Down Regulator
6A 600KHz Synchronous Step Down Regulator
August 2012 Rev. 2.2.0
GENERAL DESCRIPTION APPLICATIONS
The SP7663 is a synchronous voltage mode Distributed Power Architectures
PWM step down (buck) regulator capable of a
Point of Load Converters
constant output current up to 6 Amps. A wide
5V to 22V single input voltage range allows for Power Supply Modules
single supply operations from industry
FPGAs, DSPs and Processors Supplies
standard 5V, 12V and 18V power rails.
Operations down to 3V are supported with an
additional biasing voltage. FEATURES
With a 600kHz constant operating frequency
6A Continuous Current
and integrated high and low side switch, the
5V-22V Single Input Voltage Rail
SP7663 reduces the overall component count
3V-22V Input Voltage with 5V Bias
and solution footprint. In addition to a 1%
output setpoint accuracy, this device provides
PWM Voltage Mode Control
high efficiency, low ripple and excellent line
600kHz Fixed Synchronous Operations
and load regulation. An enable function and
Low RDSON Power Switches
soft start feature allow for controlled power up
sequencing implementation.
0.8V Min. Output Voltage 1% Accuracy
Built-in current limiting, UVLO, output short-
Type II & III Compensations Support
circuit and over temperature protection insure
Programmable Soft Start
safe operation under abnormal operating
conditions. Over Temperature & Short Circuit
Protection/Auto-Restart
The SP7663 is offered in a RoHS compliant,
lead free 26-pin 7mmx4mm DFN package. Current Limiting
RoHS Compliant Lead Free 26-Pin DFN
US Patent #6,922,041
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP7663 Application Diagram
Exar Corporation www.exar.com
48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 Fax. +1 510 668-7001 SSPP77666633
TM
TM
PPoowweerrbbllooxx
6A 600KHz Synchronous Step Down Regulator
6A 600KHz Synchronous Step Down Regulator
ABSOLUTE MAXIMUM RATINGS OPERATING RATINGS
These are stress ratings only and functional operation of Input Voltage Range V .............................. 4.5V to 5.5V
CC
the device at these ratings or any other above those
Input Voltage Range V .................................. 3V to 22V
IN
indicated in the operation sections of the specifications
Junction Temperature Range ....................-40C to 125C
below is not implied. Exposure to absolute maximum
Thermal Resistance ........................................ 5C/W
JC
rating conditions for extended periods of time may affect
Thermal Resistance JA ...................................... 36C/W
reliability.
V ...................................................................... 7.0V
CC
V ........................................................................ 25V
IN
BST ...................................................................... 30V
LX-BST..................................................... -0.3V to 7.0V
LX ............................................................... -1V to 30V
All other pins ................................... -0.3V to (V +0.3)V
CC
Storage Temperature .............................. -65C to 150C
Power Dissipation .....................Internally Limited via OTP
Lead Temperature (Soldering, 10 sec).................... 300C
ESD Rating (HBM - Human Body Model) ..........................
LX, VINP, PGND................................................... 400V
All other pins ....................................................... 2kV
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Junction Temperature of T = 25C only; limits applying over the full
J
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 T = 25C, and are provided for
J
reference purposes only. Unless otherwise indicated, 4.5V < V < 5.5V, 3V < V < 22V, UVIN = 3V, C = 1F, C =
CC IN VCC COMP
0.1F, C = 50nF.
SS
Parameter Min. Typ. Max. Units Conditions
Quiescent Current
V Supply Current
IN
1.5 3.0 mA V = 0.9V
FB
(No switching)
VIN Supply Current
8 20 mA
(Switching)
BST Supply Current
0.2 0.4 mA V = 0.9V
FB
(No switching)
BST Supply Current (switching) 3 6 mA
Protection: UVLO
V UVLO Start Threshold 4.00 4.25 4.5 V
CC
V UVLO Hysteresis 200 300 mV
CC 100
UV Start Threshold 2.50 2.65 V
IN 2.30
UV Hysteresis 200 300 400 mV
IN
UV Input Current 150 A UV =3.0V
IN IN
Error Amplifier Reference
Error Amplifier Reference 0.800 0.808 V 2X Gain Config., Measure V ; V =5V
0.792 FB CC
Error Amplifier Reference Over
0.800 0.816 V
0.784
Line
COMP Sink Current 150 230 A V =0.9V, COMP=0.9V
70 FB
COMP Source Current -230 -150 -70 A V =0.9V, COMP=0.9V
FB
V Input Bias Current 50 200 nA V =0.8V
FB FB
COMP Clamp 3.5 3.8 V V =0.7V, T =25C
3.2 FB A
COMP Clamp Temp.
-2.0 mV/C
Coefficient
2012 Exar Corporation 2/18 Rev. 2.2.0