LTC1503-1.8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1503-1.8' PDF : 12 Pages View PDF
LTC1503-1.8/LTC1503-2
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1503-X Output Short-Circuit
Current vs Input Voltage
40
VOUT SHORTED TO GND
30
TA = –40°C
20
TA = 85°C
TA = 25°C
10
LTC1503-X Start-Up Time
vs Soft-Start Capacitor
100
VIN = 3.6V
10
TA = –40°C
1
TA = 25°C
TA = 85°C
0.1
0
2
3
4
5
6
INPUT VOLTAGE (V)
1503-1.8/2 G10
0.01
0.01
Output Load Transient Response
(LTC1503-1.8,1mA to 100mA Step)
Output Ripple, COUT = 10µF
0.1
1
10
100
SOFT-START CAPACITOR (nF)
1503-1.8/2 G10
Output Ripple, COUT = 22µF
100mA
IOUT
50mA/DIV
1mA
VOUT
50mV/DIV
AC COUPLED
VOUT
10mV/DIV
AC COUPLED
VOUT
10mV/DIV
AC COUPLED
1ms/DIV
1503-1.8/2 G12
VIN = 3.6V
5µs/DIV
VOUT = 2V
IOUT = 100mA
COUT = 10µF CERAMIC
1503-1.8/2 G13
VIN = 3.6V
5µs/DIV
VOUT = 2V
IOUT = 100mA
COUT = 22µF CERAMIC
1503-1.8/2 G14
PI FU CTIO S
VOUT (Pin 1): Regulated Output Voltage. VOUT is discon-
nected from VIN during shutdown. Bypass VOUT to ground
with a ≥ 10µF low ESR capacitor.
C1– (Pin 2): Flying Capacitor One Negative Terminal.
C1+ (Pin 3): Flying Capacitor One Positive Terminal.
VIN (Pin 4): Input Voltage. VIN may be between 2.4V and
6V. Bypass VIN to ground with a ≥10µF low ESR capacitor.
SHDN/SS (Pin 5): Shutdown/Soft-Start Control. The pin
is designed to be driven with an external open-drain
output. Holding the SHDN/SS pin below 0.25V will force
the part into shutdown mode. An internal pull-up current
of 2µA will force the SHDN/SS voltage to climb to VIN once
the device driving the pin is forced into a Hi-Z state. To
limit inrush current on start-up, connect a capacitor
between the SHDN/SS pin and ground. Capacitance on
the SHDN/SS pin will limit the dV/dt of the pin during turn-
on which, in turn, will limit the dV/dt of VOUT. By selecting
an appropriate soft-start capacitor for a known output
capacitor, the user can control the inrush current during
4
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