SC411 Datasheet, PDF (7/27 Pages) Semtech Corporation – Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller

POWER MANAGEMENT
Pin Configuration
16 15 14 13
VOUT ¹
VCCA ²
FB ³
PGD 4
TOP VIEW
T
12 DH
11 LX
10 ILIM
9 VDDP
5678
SC411
Ordering Information
Device
Package⁽¹⁾
SC411MLTRT⁽²⁾
MLPQ-16
SC411EVB
Evaluation Board
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.
MLPQ16: 4X4 BODY
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
9
10
11
Pin Name Pin Function
VOUT
VCCA
FB
PGD
NC
VSSA
PGND
DL
VDDP
ILIM
LX
Output voltage sense input. Connect to the output at the load.
Supply voltage input for the analog supply. Use a 10Ω /1μF RC filter 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 fixed 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.
© 2007 Semtech Corp.
7
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