SC488 Semtech Corporation, SC488 Datasheet - Page 6

• Manufacturer Part Number: SC488
• Description: Complete DDR1/2/3 Memory Power Supply
• Manufacturer: Semtech Corporation

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© 2006 Semtech Corp.
POWER MANAGEMENT
Pin Description
Pin Confi guration
Pin #
10
12
13
11
1
2
3
4
5
6
7
8
9
PGND2
VCCA
VSSA
VTTS
TON
REF
Pin Name
EN/PSV
VDDQS
PGND2
VTTEN
VCCA
VTTS
VSSA
PGD
TON
REF
2
1
4
3
5
NC
NC
6
FB
SC488
SC480 MLP24 Pin Out
Pin Function
Power ground for VTT output. Connect to thermal pad and ground plane.
Sense pin for VTT. Connect to VTT at the load.
Ground reference for analog circuitry. Connect to thermal pad.
This pin is used to sense VBAT through a pull-up resistor, RTON, which sets the top MOSFET
on-time. Bypass this pin with a 1nF capacitor to VSSA.
Reference output. An internal resistor divider from VDDQS sets this voltage to 50% VDDQ (nomi-
nal). Bypass this pin with a series 10Ω/1μF to VSSA.
Analog supply voltage input. Use a 10Ω/1μF RC fi lter from +5V to VSSA.
No connect.
Sense input for VDDQ. Used to set the on-time for the top MOSFET and also to set REF/VTT.
Feedback select input for VDDQ. See FB Confi guration Table.
Enable pin for VTT. Pull this pin low to disable VTT (REF remains present as long as VDDQ is
present).
Enable/Power Save input pin. Tie to ground to disable VDDQ. Tie to +5V to enable VDDQ and
activate PSAVE mode. Float to enable VDDQ and activate continous conduction mode. If fl oated,
bypass to VSSA with a 10nF capacitor.
No connect.
Power good output for VDDQ. PGD is low if VDDQ is outside the power good thresholds. This
pin is an open drain NMOS output and requires an external pull-up resistor.
T
18
17
16
15
14
13
PGND1
PGND1
ILIM
VDDP
VDDP
PGD
6
Notes:
1) Only available in tape and reel packaging. A reel contains 3000 devices.
2) This product is fully WEEE and RoHS compliant.
Ordering Information
SC488MLTRT
Device
(2)
Package
MLPQ-24
www.semtech.com
SC488
(1)