鈥?/div>
Non-isolated DDR/QDR Memory Bus Termination Module
NEW Product
V
TT
bus termination output (output tracks the system V
REF
)
6 A output current (8 A Peak)
3.3 Vdc, 5 Vdc or 12 Vdc input voltage
DDR and QDR compatible
ON/OFF inhibit (for V
TT
standby)
Under-voltage lockout
Operating temperature range: -40 潞C to +85 潞C
Efficiencies up to 88%
Output overcurrent protection (non-latching, auto-reset)
Point-of-Load-Alliance (POLA) compatible
Available RoHS compliant
PTHxx050Y
The PTHxx050Y are a new series of non-isolated dc-dc converters designed
specifically for bus termination in DDR and QDR memory applications. Operating from
either a 3.3 Vdc, 5 Vdc or 12 Vdc input, the modules generate a V
TT
output that will
source or sink up to 6 A of current to accurately track their V
REF
input. V
TT
is the
required bus termination supply voltage, and V
REF
is the reference voltage for the
memory and chipset bus receiver comparators. V
REF
is usually set to half the V
DDQ
power supply voltage. The PTHxx050Y series employs an actively switched
synchronous rectifier output to provide state of the art stepdown switching conversion.
The products are small in size and are an ideal choice where space, performance and
high efficiency are desired.
All specifications are typical at nominal input, V
REF
= 1.25 V, full load at 25 擄C
unless otherwise stated. C
in
, C
o1
and C
o2
= typical value
OUTPUT SPECIFICATIONS
Output current
(over 鈭哣
REF
range)
Tracking range for V
REF
Tracking tolerance to V
REF
(V
TT
- V
REF
)
(over line, load
and temperature)
Ripple and noise
Load transient response
(See Note 5)
Output capacitance:
Non-ceramic values
(See Notes 5 and 6)
Ceramic values
(See Note 5)
(See Note 7)
20 MHz bandwidth
All models
Continuous (See Note 1)
Repetitive pulse (See Note 2)
鹵6 A
鹵8 A
0.55-1.8 V
-10 mV to +10mV
INPUT SPECIFICATIONS CONTD.
Input capacitance
(See Note 4)
Remote ON/OFF
GENERAL SPECIFICATIONS
Efficiency
Io = 4 A
Insulation voltage
Switching frequency
PTH03050Y
PTH05050Y
PTH12050Y
PTH03050Y
PTH05050Y
PTH12050Y
2 YEAR WARRANTY
SPECIFICATIONS
PTH03050Y and PTH05050Y
PTH12050Y
470 碌F
560 碌F
Active high
88% typ.
87% typ.
84% typ.
Non-isolated
550- 650 kHz
550-650 kHz
200-300 kHz
EN60950
UL/cUL60950
UL94V-0
20 mV pk-pk
80 碌s settling time
Overshoot/undershoot 25 mV typ.
PTH03050Y 470 碌F typ., 3,300 碌F max.
PTH05050Y 470 碌F typ., 3,300 碌F max.
PTH12050Y 940 碌F typ., 3,300 碌F max.
PTH03050Y 200 碌F typ., 300 碌F max.
PTH05050Y 200 碌F typ., 300 碌F max.
PTH12050Y 400 碌F typ., 600 碌F max.
4 m鈩?min
ESR (non-ceramic)
Approvals and
standards
Material flammability
Dimensions
Weight
MTBF
Telcordia SR-332
(L x W x H)
22.10 x 12.57 x 8.50 mm
0.870 x 0.495 x 0.335 in
2.9 g (0.10 oz)
6,000,000 hours
INPUT SPECIFICATIONS
Input current
Input voltage range
No load
PTH03050Y
PTH05050Y
PTH12050Y
10 mA
2.95-3.65 Vdc
4.5-5.5 Vdc
10.8-13.2 Vdc
ENVIRONMENTAL SPECIFICATIONS
Thermal performance
(See Note 2)
MSL (鈥榋鈥?suffix only)
Vin increasing 2.45 V typ., 2.80 V max.
Vin decreasing 2.20 V min., 2.40 V typ.
Vin
Vin
Vin
Vin
increasing 4.30 V typ., 4.45 V max.
decreasing 3.40 V min., 3.70 V typ.
increasing
9.5 V typ., 10.4 V max.
decreasing
8.80 V min., 9.0 V typ.
PROTECTION
Overcurrent threshold
(auto reset)
All models
12 A typ.
Operating ambient,
temperature
Non-operating
-40 潞C to +85 潞C
-40 潞C to +125 潞C
Undervoltage lockout:
PTH03050Y
PTH05050Y
PTH12050Y
JEDEC J-STD-020C Level 3
File Name: PTHxx050Y.pdf Rev (02): 19 Dec 2005
1
2
3
4
