Datasheet

LT3032 Series
14
3032ff
For more information www.linear.com/LT3032
PIN FUNCTIONS
OUTP (Pin 1): Positive Output. This output supplies power
to the positive side load. A minimum output capacitor
of 2.2µF is required to prevent oscillations. Larger out
-
put capacitors are required for applications with large
transient loads to limit peak voltage transients. See the
Applications Information section for more information
on output capacitance, bypass capacitance, and reverse
output characteristics.
ADJP (Pin 2, Adjustable Part Only): Positive Adjust. This
is the input to the positive side error amplifier. This pin
is internally clamped to ±7V. It has a typical bias current
of 30nA which flows into the pin (see curve of ADJP Pin
Bias Current vs Temperature in the Typical Performance
Characteristics). The ADJP pin voltage is 1.22V referenced
to ground and the output voltage range is 1.22V to 20V.
BYPP (Pin 3): Positive Bypass. The BYPP pin is used to
bypass the reference of the positive side regulator to achieve
low noise performance. The BYPP pin is clamped internally
to ±0.6V (one V
BE
). A small capacitor from OUTP to this pin
will bypass the reference to lower the output voltage noise.
A maximum value of 0.01µF is used for reducing output
voltage noise to a typical 20µV
RMS
over the 10Hz to 100kHz
bandwidth. If not used, this pin must be left unconnected.
GND (Pins 4, 5, Exposed Pad Pin 15): Ground. One of
the DFN’s exposed backside pads (Pin 15) is an electrical
connection to ground. To ensure proper electrical and
thermal performance, solder Pin 15 to the PCB’s ground
and tie directly to Pins 4 and 5. Connect the bottom of
the positive and negative output voltage setting resistor
dividers directly to Pins 4 and 5 for optimum load regula
-
tion performance.
INN (
Pin 6, 9, Exposed Pad Pin 16): Negative Input. The
DFN package’s second exposed backside pad (Pin 16) is
an electrical connection to INN. To ensure proper electri
-
cal and thermal performance, solder Pin 16 to the PCB’s
negative
input supply and tie directly to Pins 6 and 9.
Power is
supplied to the negative side of the LT3032
through
the INN pins. A bypass capacitor is required on
this pin if it is more than six inches away from the main
input filter capacitor. In general, the output impedance of
a battery rises with frequency, so it is advisable to include
a bypass capacitor in battery-powered circuits. A bypass
capacitor in the range of 1µF to 10µF is sufficient.
TYPICAL PERFORMANCE CHARACTERISTICS
OUTP Transient Response
C
BYPP
= 0.01µF
TIME (µs)
0.04
0.02
0
–0.02
–0.04
OUTP VOLTAGE
DEVIATION (V)
150
100
50
0
LOAD CURRENT
(mA)
3032 G49
0 40
80
120 160 200
V
OUTP
= 5V
V
INP
= 6V
C
INP
= 10µF
C
OUTP
= 10µF
OUTN Transient Response
C
BYPN
= 0
OUTN Transient Response
C
BYPN
= 0.01µF
TIME (µs)
0.2
0.1
0
–0.2
–0.1
0
–50
–150
–100
OUTN VOLTAGE
DEVIATION (V)
LOAD CURRENT
(mA)
3032 G50
0 100 200 300 400 500 600 700 800 900 1k
V
OUTN
= –5V
V
INN
= –6V
C
INN
= 10µF
C
OUTN
= 10µF
TIME (µs)
0.04
0.06
0.02
0
–0.02
–0.04
–0.06
–50
0
–100
–150
OUTN VOLTAGE
DEVIATION (V)
LOAD CURRENT
(mA)
3032 G51
0 50 100 150 200 250 300 350 400 450 500
V
OUTN
= –5V
V
INN
= –6V
C
INN
= 10µF
C
OUTN
= 10µF
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