SC411 Semtech Corporation, SC411 Datasheet - Page 7

• Manufacturer Part Number: SC411
• Description: Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller
• Manufacturer: Semtech Corporation

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© 2007 Semtech Corp.
POWER MANAGEMENT
Pin Confi guration
Pin Descriptions
Pin #
10
11
1
2
3
4
5
6
7
8
9
VCCA
VOUT
PGD
FB
Pin Name
PGND
VOUT
VCCA
VDDP
VSSA
PGD
ILIM
NC
FB
DL
LX
1
2
3
4
MLPQ16: 4X4 BODY
16
5
TOP VIEW
15
6
Pin Function
Output voltage sense input. Connect to the output at the load.
Supply voltage input for the analog supply. Use a 10Ω /1μF RC fi lter from 5VSUS to VSSA.
Feedback input. Connect to a resistor divider located at the IC from VOUT to VSSA to
set the output voltage from 0.5V to VCCA.
Power Good open drain NMOS output. Goes high after a fi xed clock cycle delay
(440 cycles) following power up.
Not Connected.
Ground reference for analog circuitry. Connect directly to thermal pad.
Power ground. Connect directly to thermal pad.
Gate drive output for the low side MOSFET switch.
+5V supply voltage input for the gate drivers. Decouple this pin with a 1μF ceramic
capacitor to PGND.
Current limit input. Connect to drain of low-side MOSFET for RDS(on) sensing or the
source for resistor sensing through a threshold sensing resistor.
Phase node (junction of top and bottom MOSFETs and the output inductor) connection.
T
14
7
13
8
12
11
10
9
ILIM
LX
VDDP
DH
7
Notes:
1) Only available in tape and reel packaging. A reel contains 3000
devices.
(2) Lead free product. This product is fully WEEE, RoHS and
J-STD-020B compliant.
Ordering Information
SC411MLTRT
SC411EVB
Device
(2)
Evaluation Board
Package
MLPQ-16
www.semtech.com
SC411
(1)