SC1116 Datasheet, PDF (1/11 Pages) Semtech Corporation – Linear FET Controller For DDR Supplies

POWER MANAGEMENT
Description
The SC1116 is a low cost controller for low power
linear DDR power supplies.
The SC1116 comes in a space saving SOT-23 6 pin
package.
The SC1116 provides a dual gate drive for the top serial
and bottom parallel MOSFETs with internal shoot through
protection.
The wide range of input voltages (3V to 15V) allows the
chip to work in many various applications.
The variable output voltage is programmable from the
outside with an input divider or an external reference.
Wide range of V_DDQ, down to 0.5V
SC1116
Linear FET Controller
For DDR Supplies
Features
‹ User can select FETs to optimize system current
rating/dropout/cost
‹ Low V_DDQ, 0.5V to 2.5V
‹ -40°C to +85°C operating temperature
‹ External compensation capable for low ESR loads
‹ Minimum external components
‹ 0.6 mA Quiescent current
‹ Guaranteed no shoot through
‹ SOT-23 6L small package. Fully WEEE and RoHS
compliant
Applications
‹ DDR supplies
‹ SCSI
‹ Line termination
‹ Source / Sink LDOs
Typical Application Circuit
VDDQ=2.5Vtyp
R1
1k 0.5%
Vcc=3 to 15V
R2
1k 0.5%
Q1
MOS FET N
U1
SC1116
1
0 .1uF
2
VCC
GND
DRVH ⁶
FB ⁵
3 _REF
DRVL ⁴
0 .1uF
4 7uF
typ
Q2
MOS FET N
1k
typ
4 .7nF
typ
1k
typ
4 .7nF
typ
VTT=1.25Vtyp
GND
Notes:
(1) Values used for optional compensation are 1K and 4.7nF typical.
(2) When using 3V as Vcc, use of low threshold FETs is a must.
Revision: March 28, 2007
1
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