LT3024 LINER [Linear Technology], LT3024 Datasheet - Page 10

• Manufacturer Part Number: LT3024
• Description: Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulator
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
APPLICATIO S I FOR ATIO
LT3024
GND (Pins 4, 13)/(Pins 1, 5, 8, 9, 16, 17): Ground. The
Exposed Pad must be soldered to PCB ground for opti-
mum thermal performance.
ADJ1/ADJ2 (Pins 12/7)/(Pins 15/10): Adjust Pin. These
are the input to the error amplifiers. These pins are
internally clamped to 7V. They have a bias current of
30nA which flows into the pin (see curve of ADJ1/ADJ2 Pin
Bias Current vs Temperature in the Typical Performance
Characteristics section). The ADJ1 and ADJ2 pin voltage
is 1.22V referenced to ground and the output voltage
range is 1.22V to 20V.
BYP1/BYP2 (Pins 1/6)/(Pins 2/7): Bypass. The BYP1/BYP2
pins are used to bypass the reference of the LT3024
regulator to achieve low noise performance from the
regulator. The BYP1/BYP2 pins are clamped internally to
corresponding output to this pin will bypass the reference
to lower the output voltage noise. A maximum value of
0.01 F can be used for reducing output voltage noise to a
typical 20 V
used, this pin must be left unconnected.
OUT1/OUT2 (Pins 2, 3/5)/(Pins 3, 4/6): Output. The
outputs supply power to the loads. A minimum output
capacitor of 1 F is required to prevent oscillations on
Output 2; Output 1 requires a minimum of 3.3 F. Larger
output capacitors will be required for applications with
large transient loads to limit peak voltage transients. See
the Applications Information section for more information
on output capacitance and reverse output characteristics.
The LT3024 is a dual 100mA/500mA low dropout regula-
tor with micropower quiescent current and shutdown. The
device is capable of supplying 100mA from Output 2 at a
dropout voltage of 300mV. Output 1 delivers 500mA at a
dropout voltage of 300mV. The two regulators have com-
mon V
ever, the two outputs of the LT3024 operate indepen-
dently. They can be shut down independently and a fault
10
0.6V (one V
U
IN
and GND pins and are thermally coupled, how-
U
RMS
BE
) from ground. A small capacitor from the
over a 10Hz to 100kHz bandwidth. If not
U
U
U
(DFN Package)/(TSSOP Package)
W
U
SHDN1/SHDN2 (Pins 11/8)/(Pins 14/11): Shutdown. The
SHDN1/SHDN2 pins are used to put the corresponding
output of the LT3024 regulator into a low power shutdown
state. The output will be off when the pin is pulled low. The
SHDN1/SHDN2 pins can be driven either by 5V logic or
open-collector logic with pull-up resistors. The pull-up
resistors are required to supply the pull-up current of the
open-collector gates, normally several microamperes,
and the SHDN1/SHDN2 pin current, typically 1 A. If
unused, the pin must be connected to V
not function if the SHDN1/SHDN2 pins are not connected.
IN (Pins 9, 10)/(Pins 12, 13): Input. Power is supplied to
the device through the IN pin. A bypass capacitor is
required on this pin if the device 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 1 F to
10 F is sufficient. The LT3024 regulator is designed to
withstand reverse voltages on the IN pin with respect to
ground and the OUT pin. In the case of a reverse input,
which can happen if a battery is plugged in backwards, the
device will act as if there is a diode in series with its input.
There will be no reverse current flow into the regulator and
no reverse voltage will appear at the load. The device will
protect both itself and the load.
condition on one output will not affect the other output
electrically. Output voltage noise can be lowered to 20 V
over a 10Hz to 100kHz bandwidth with the addition of a
0.01 F reference bypass capacitor. Additionally, the refer-
ence bypass capacitor will improve transient response of
the regulator, lowering the settling time for transient load
conditions. The low operating quiescent current (30 A per
output) drops to less than 1 A in shutdown. In addition to
IN
. The device will
RMS
3024f