Technical Specification
Non-Isolated
SIP Converter
3.0 - 3.6V
15A
in
nal resistor, connect the resistor Rtrim-down between Pin 10 (TRIM)
and the Vout pins or the SENSE pin. For a desired decrease of
the nominal output voltage, the value of the resistor should be:
BASIC OPERATION AND FEATURES
The NiQor series non-isolated converter uses a buck-converter
that keeps the output voltage constant over variations in line,
load, and temperature. The NiQor modules employ synchro-
nous rectification for very high efficiency.
_
VOUT 0.80
_
=
_
Rtrim-down
1
x 30100
(Ω)
Rbuffer
[( ) ]
∆
VOUT
Dissipation throughout the converter is so low that it does not
require a heatsink or metal baseplate for operation. The NiQor
converter can thus be built more simply and reliably using high
yield surface mount techniques on a single PCB substrate.
where
VOUT = Nominal Output Voltage
OUT = Nominal VOUT - Desired VOUT
∆
V
R
buffer = defined in Table 1 below
(value internal to the module)
The NiQor series of SIPs and SMT converters uses the estab-
lished industry standard footprint and pin-out configurations.
Vout, set Rbuffer
Note: wide trim unit has trim
range from 0.85-2.75V. Nominal
voltage is 0.9V. Use Rbuffer value
3.3 V
2.5 V
1.8 V
1.5 V
1.2 V
0.9 V
59 kΩ
78.7 kΩ
100 kΩ
100 kΩ
59 kΩ
CONTROL FEATURES
of 5.11kΩ. when trimming.
REMOTE ON/OFF (Pin 11): The ON/OFF input, Pin 11,
permits the user to control when the converter is on or off. There
are currently two options available for the ON/OFF input as
described in the table below. Other options may be added
based on user demand.
5.11 kΩ
Table 1: Rbuffer values for NiQor trim equation
For example, to trim-down the output voltage of a 1.8V module
by 5% to 1.71V, the Rtrim-down resistor value is calculated as fol-
lows:
Pin-Open
Option
Description Converter state
Pin Action
Pull Low = On
Pull High = Off
VOUT = 1.8V
N Logic Negative
Off
On
∆
V
OUT = 1.8V - 1.71V = 0.09V
buffer = 100
Rtrim-down = [((1.8 - 0.8)/0.09 -1) x 30100] - 100000 = 204.34
O Logic Negative/Open
R
kΩ
Figure A is a schematic view of the internal ON/OFF circuitry.
Vin
kΩ
TRIM-UP: To increase the output voltage using an external
resistor, connect the resistor Rtrim-up between Pin 10 (TRIM) and
the Common Ground Pins. For a desired increase of the nom-
inal output voltage, the value of the resistor should be:
(N logic only)
10K
PWM
Enable
ON/OFF
20K
24080
_
=
Rtrim-up
(Ω)
Rbuffer
∆
VOUT
20K
where
∆
VOUT = Nominal VOUT - Desired VOUT
Negative
Logic (N,O)
R
buffer = defined in Table 1
For example, to trim-up the output voltage of a 2.5V module by
10% to 2.75V, the Rtrim-up resistor value is calculated as follows:
Figure A: Schematic view of the internal ON/OFF circuitry
∆
V
OUT = 2.5V - 2.75V = 0.25V
buffer = 78.7
Rtrim-up = (24080/0.25) - 78700 = 17.62
OUTPUT VOLTAGE TRIM (Pin 10): The TRIM input permits
the user to adjust the output voltage up or down according to
the trim range specifications by using an external resistor or a
voltage source. If the TRIM feature is not being used, leave the
TRIM pin disconnected.
R
kΩ
kΩ
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
TRIM-DOWN: To decrease the output voltage using an exter-
Product # NQ03xxxVMA15
Phone 1-888-567-9596
Doc.# 005-2NV3xxE Rev. E
6/24/04
Page 13
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