NQ03009VMA15NRS Datasheet, PDF (13/17 Pages) SynQor Worldwide Headquarters – 15A Non-Isolated DC/DC Converter in SIP configuration

Technical Specification
Non-Isolated
SIP Converter
3.0 - 3.6Vin 15A
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.
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.
The NiQor series of SIPs and SMT converters uses the estab-
lished industry standard footprint and pin-out configurations.
CONTROL FEATURES
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.
Option
N Logic
O Logic
Description
Negative
Negative/Open
Pin-Open
Converter state
Off
On
Pin Action
Pull Low = On
Pull High = Off
Figure A is a schematic view of the internal ON/OFF circuitry.
Vin
10K
(N logic only)
ON/OFF
20K
PWM
Enable
20K
Negative
Logic (N,O)
Figure A: Schematic view of the internal ON/OFF circuitry
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.
TRIM-DOWN: To decrease the output voltage using an exter-
nal resistor, connect the resistor R_trim-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:
[( ) ] ^{Rtrim-down =}
V_OUT ^_ 0.80 _{_ 1}
∆V_OUT
x 30100
_ _Rbuffer
(Ω)
where
V_OUT = Nominal Output Voltage
∆V_OUT = Nominal V_OUT - Desired V_OUT
R_buffer = defined in Table 1 below
(value internal to the module)
V_out, set R_buffer
3.3 V 59 kΩ
Note: wide trim unit has trim
2.5 V 78.7 kΩ range from 0.85-2.75V. Nominal
1.8 V 100 kΩ
voltage is 0.9V. Use Rbuffer value
1.5 V 100 kΩ of 5.11kΩ. when trimming.
1.2 V 59 kΩ
0.9 V 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 R_trim-down resistor value is calculated as fol-
lows:
V_OUT = 1.8V
∆V_OUT = 1.8V - 1.71V = 0.09V
R_buffer = 100kΩ
Rtrim-down = [((1.8 - 0.8)/0.09 -1) x 30100] - 100000 = 204.34kΩ
TRIM-UP: To increase the output voltage using an external
resistor, connect the resistor R_trim-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:
24080
∆ ^{Rtrim-up =}
V_OUT
_ _Rbuffer
(Ω)
where _{∆VOUT = Nominal VOUT - Desired VOUT}
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 R_trim-up resistor value is calculated as follows:
∆V_OUT = 2.5V - 2.75V = 0.25V
R_buffer = 78.7kΩ
Rtrim-up = (24080/0.25) - 78700 = 17.62kΩ
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
Product # NQ03xxxVMA15
Phone [phone]
Doc.# 005-2NV3xxE Rev. E
6/24/04
Page 13