PTHxx050Y
3.3/5/12 Vin Single Output
DC-DC CONVERTERS Non-isolated DDR/QDR Memory Bus Termination Module
1
• VTT bus termination output (output tracks the system VREF)
• 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 VTT standby)
• Under-voltage lockout
• Operating temperature range: -40 ºC to +85 ºC
• Efficiencies up to 88%
• Output overcurrent protection (non-latching, auto-reset)
• Point-of-Load-Alliance (POLA) compatible
• Available RoHS compliant
NEW Product
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 VTT output that will
source or sink up to 6 A of current to accurately track their VREF input. VTT is the
required bus termination supply voltage, and VREF is the reference voltage for the
memory and chipset bus receiver comparators. VREF is usually set to half the VDDQ
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, VREF = 1.25 V, full load at 25 °C
unless otherwise stated. Cin, Co1 and Co2 = typical value
2 YEAR WARRANTY
SPECIFICATIONS
OUTPUT SPECIFICATIONS
INPUT SPECIFICATIONS CONTD.
Output current
(over ∆VREF range)
All models
Continuous (See Note 1)
Repetitive pulse (See Note 2)
±6 A
±8 A
Tracking range for VREF
Tracking tolerance to VREF (VTT - VREF)
(over line, load
and temperature)
0.55-1.8 V
-10 mV to +10mV
Ripple and noise
20 MHz bandwidth
20 mV pk-pk
Load transient response
(See Note 5)
80 µs settling time
Overshoot/undershoot 25 mV typ.
Output capacitance:
Non-ceramic values
(See Notes 5 and 6)
Ceramic values
(See Note 5)
(See Note 7)
PTH03050Y 470 µF typ., 3,300 µF max.
PTH05050Y 470 µF typ., 3,300 µF max.
PTH12050Y 940 µF typ., 3,300 µF max.
PTH03050Y
PTH05050Y
PTH12050Y
200 µF typ., 300 µF max.
200 µF typ., 300 µF max.
400 µF typ., 600 µF max.
ESR (non-ceramic)
4 mΩ min
Input capacitance
(See Note 4)
PTH03050Y and PTH05050Y 470 µF
PTH12050Y
560 µF
Remote ON/OFF
Active high
GENERAL SPECIFICATIONS
Efficiency
Io = 4 A
PTH03050Y
PTH05050Y
PTH12050Y
88% typ.
87% typ.
84% typ.
Insulation voltage
Non-isolated
Switching frequency
PTH03050Y
PTH05050Y
PTH12050Y
550- 650 kHz
550-650 kHz
200-300 kHz
Approvals and
standards
EN60950
UL/cUL60950
Material flammability
UL94V-0
Dimensions
(L x W x H) 22.10 x 12.57 x 8.50 mm
0.870 x 0.495 x 0.335 in
Weight
2.9 g (0.10 oz)
INPUT SPECIFICATIONS
Input current
No load
10 mA
Input voltage range
PTH03050Y
PTH05050Y
PTH12050Y
2.95-3.65 Vdc
4.5-5.5 Vdc
10.8-13.2 Vdc
Undervoltage lockout:
PTH03050Y
PTH05050Y
PTH12050Y
Vin increasing 2.45 V typ., 2.80 V max.
Vin decreasing 2.20 V min., 2.40 V typ.
Vin increasing 4.30 V typ., 4.45 V max.
Vin decreasing 3.40 V min., 3.70 V typ.
Vin increasing 9.5 V typ., 10.4 V max.
Vin decreasing 8.80 V min., 9.0 V typ.
MTBF
Telcordia SR-332
6,000,000 hours
ENVIRONMENTAL SPECIFICATIONS
Thermal performance
(See Note 2)
Operating ambient, -40 ºC to +85 ºC
temperature
Non-operating
-40 ºC to +125 ºC
MSL (‘Z’ suffix only)
JEDEC J-STD-020C Level 3
PROTECTION
Overcurrent threshold
(auto reset)
All models
12 A typ.
File Name: PTHxx050Y.pdf Rev (02): 19 Dec 2005
