FAN1654 Datasheet, PDF (2/7 Pages) Fairchild Semiconductor – 1.5A LDO, DDR Bus Termination Regulator

PRODUCT SPECIFICATION
Pin Assignments
VDD 1
VDD 2
VTTFORCE 3
VSS 4
VSS 5
VTTFORCE 6
VDD 7
VSS 8
FAN1654
16 NC
15 VDDQ
14 VREFOUT
13 VSSQ
12 SHDN
11 VREFIN
10 VTTSENSE
9 NC
16-Lead Plastic eTSSOP-16
θ_JC = 4˚C/W*
*With package power slug soldered to 0.5 square inch
copper area over backside ground plane of internal
power plane
FAN1654
VSSQ 1
VREFOUT 2
VDDQ 3
VDD 4
VDD 5
VTTFORCE 6
VSS 7
FAN1654
14 SHDN
13 VREFIN
12 VTTSENSE
11 VSS
10 VDD
9 VTTFORCE
8 VSS
14-Lead Plastic SOIC
θ_JC = 37˚C/W, θ_JA = 88˚C/W
Pin Definitions
Pin Number*
1, 2, 7 (4, 5, 10)
3, 6 (6, 9)
4, 5, 8 (7, 8, 11)
10 (12)
11 (13)
12 (14)
13 (1)
14 (2)
15 (3)
9,16
Pin Name
VDD
VTTFORCE
VSS
VTTSENSE
VREFIN
SHDN
VSSQ
VREFOUT
VDDQ
NC
Pin Function Description
VDD. Input power for the LDO.
VTT Force Output.
Power Ground.
VTT Sense. Feedback for remote sense of the VTT voltage.
VREFIN. Alternative input for direct control of VTTOUT and VREFOUT.
Shutdown. This active low shutdown turns off both VTT and VREFOUT. This
pin has an internal pull-down, and must be externally driven high for the IC to be
on.
Signal Ground.
Buffered Voltage Reference Output.
VDDQ Input. Attach this pin to the VDDQ supply to generate VTT and
VREFOUT.
No Internal Connection
* Pin Numbers in brackets are for the SOIC-14 package
Typical Application
VDD
GND
VDDQ
100µF
6V
10µF
1
16
2
15
3
14
4 _FAN1654 13
5
12
6
11
7
10
8
9
470µF
10k
VTTFORCE
10µF
VREFOUT
1nF
SHDN
VTTSENSE
(connect to VTTFORCE
1nF
at the load)
GND
Figure 1. (eTSSOP pinout shown)
2
REV. 1.0.5 4/17/02