PT6470 Datasheet, PDF (3/14 Pages) Texas Instruments – 14-A 3.3-V Input Adjustable Integrated Switching Regulator

PT6470 Series
14-A 3.3-V Input Adjustable
Integrated Switching Regulator
SLTS180A - JANUARY 2003 - REVISED JUNE 2003
Pin Descriptions
V_IN: The positive supply voltage input for the module
with respect to the common GND.
V_OUT: This is the regulated output voltage from the mod-
ule with respect to the common GND.
GND: The common node to which the input, output, and
external control signals are referenced.
Inhibit*: This is an open-collector (open-drain) negative
logic input that is referenced to GND. Pulling this pin
low disables the module’s output voltage. If Inhibit* is
left open-circuit, the output will be active whenever a
valid input source is applied.
V_o Adjust: This pin is used to trim the output voltage
over a typical range of ±15 % of nominal. The adjust-
ment method uses an external resistor. The resistor is
connected from V_o Adjust to either the GND or (+)Sense,
in order to adjust the output either up or down, respec-
tively.
Vsense: An external remote sense input is provided to
allow the regulation circuit to compensate for voltage
drop between the module and the load. For optimal
voltage accuracy Vsense should be connected to V_OUT. If
desired, Vsense may also be left open circuit.
Typical Characteristics
Performance Data; V_in =3.3 V (See Note A)
Efficiency vs Output Current
100
90
PT6472
80
PT6473
PT6474
PT6475
70
PT6476
PT6477
60
50
0
2
4
6
8
10
12
14
Iout (A)
Power Dissipation vs Output Current
5
4
3
2
1
0
0
2
4
6
8
10
12
14
Iout (A)
Output Ripple vs Output Current
35
30
25
PT6475
20
PT6474
PT6473
PT6476
15
PT6477
PT6472
10
5
0
0
2
4
6
8
10
12
14
Iout (A)
Note A: Characteristic data has been developed from actual products tested at 25 °C. This data is considered typical data for the ISR.
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