NXA66 Series
S i n g l e o u t p u t ( N o n - I s o l a t e d )
• Transient response from 0 A to rated full load
(up to 30 A/µs), recovery within 250 µs
• Democratic current sharing, no need for master/slave
configuration
• Programmable output voltage
• Remote enable pin
• Power good signal
• True double ended differential remote sense
• Available RoHS compliant
The NXA66 non-isolated dc-dc converter is targeted at computing applications that
require point of load power conversion. The NXA66 is designed to meet the precise
voltage and fast transient requirements of today’s high performance applications such
as workstations, file servers, desktop computers, telecommunications equipment,
adapter cards, DSP and data processing. Employing synchronous rectification and
democratic current sharing, the NXA66 can be used in a stand-alone configuration, or
paralleled as a building block to achieve higher output currents or redundancy. The
current sharing specifications are met during static conditions, and transient conditions.
The advanced democratic current sharing technique employed by the NXA66 removes
the need for cumbersome master/slave combinations. The NXA66 uses gold plated
edge tab fingers for a convenient, low impedance interconnect scheme. This also
allows system designers to easily accommodate future expansion in their systems.
2 YEAR WARRANTY
All specifications are typical at nominal input, full load at 25 °C unless otherwise stated
SPECIFICATIONS
OUTPUT SPECIFICATIONS
GENERAL SPECIFICATIONS
Voltage adjustability
Vout programmable
to 2V5 or 3V3
Efficiency
3V3 output
2V5 output
86%
82%
Total error band
3V3 output
2V5 output
4.5%
4.5%
Switching frequency
Fixed
300 kHz
Approvals and
standards
EN60950
Bi-national UL1950
Ripple and noise
(20 MHz bandwidth) 150 mV pk-pk max.
CSA C22.2 No. 234/950
Transient response
peak dev. settling time
50% to 75% and back
to 1.0%, no external cap.
150 mV
400 µs
Weight
MTBF
42.6 g (1.5 oz)
Short circuit protection
Isc = 25 A rms
Continuous
Bellcore 332
3,500,000 hours
automatic recovery
ENVIRONMENTAL SPECIFICATIONS
INPUT SPECIFICATIONS
Input voltage range
Input current
Maximum temperature
shock
Operating
5 ˚C/10 min.
12 Vin nominal
10.8-13.2 Vdc
No load
Remote OFF
100 mA typ.
10 mA max.
Temperature shock
Operating
Non-operating
10 ˚C/hour
20 ˚C/hour
UVLO turn ON voltage
UVLO turn OFF voltage
10.4 V max.
8.2 V min.
Humidity
Operating
Storage
85% RH
95% RH
Start-up time
Nominal line
15 ms
Altitude
Operating
Storage
10,000 feet max.
50,000 feet max.
Active high remote ON/OFF
Logic compatibility
ON
Shock
Operational and
non-operational
50 G 11ms
half sine wave
Ref. to -input
10.8 Vdc min.
0.8 Vdc max.
Open circuit voltage
OFF
Vibration
(See Note 3)
Operational and
non-operational
0.02 G2/Hz max.
Electrostatic discharge
Operating (See Note 4)
non-operating
ESD 15 kV
ESD 25 kV
File Name: nxa66.pdf Rev (02): 20 Dec 2005
