LTC1515 查看數據表（PDF） - Linear Technology
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LTC1515 Datasheet PDF : 8 Pages
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LTC1515 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1515-X
3V Efficiency vs Input Voltage
100
VOUT = 3V
IOUT = 10mA
TA = 25°C
80
LTC1515-X
3.3V Efficiency vs Input Voltage
100
VOUT = 3.3V
IOUT = 10mA
TA = 25°C
80
LTC1515-X
5V Efficiency vs Input Voltage
100
VOUT = 5V
IOUT = 10mA
TA = 25°C
80
60
60
60
40
40
40
20
0
2
4
6
8
10
INPUT VOLTAGE (V)
1515 G09
20
0
2
4
6
8
10
INPUT VOLTAGE (V)
1515 G07
20
2
4
6
8
10
12
INPUT VOLTAGE (V)
1515 G08
LTC1515-X Shutdown Supply
Current vs Input Voltage
25
SHDN = 0V
LTC1515-X Step-Down Mode
5V Load Transient Response
LTC1515-X Step-Up Mode
5V Load Transient Response
20
VOUT
AC COUPLED
100mV/DIV
15
VOUT
AC COUPLED
100mV/DIV
10
5
0
0
85°C
25°C
–40°C
2
4
6
8
10
INPUT VOLTAGE (V)
1515 G12
IOUT
50mA/DIV
50mA
IOUT
0mA 50mA/DIV
VIN = 8V, VOUT = 5V, COUT = 10µF, TA = 25°C
1515 G10
VIN = 3.3V, VOUT = 5V, COUT = 10µF, TA = 25°C
1515 G11
PIN FUNCTIONS
SHDN (Pin 1): Shutdown Input. A logic low on the SHDN
pin puts the part into shutdown mode. A logic high (VSHDN
≥ 1.6V) enables the part. At high VIN voltages, the SHDN
pin may still be controlled with 3V logic without causing a
large rise in VIN quiescent current. The SHDN pin may not
float; connect to VIN if unused.
POR (Pin 2): Open-Drain Power-On Reset Output. This pin
will pull low upon initial power-up, during shutdown or
until VOUT has been within 6.5% of its regulated value for
more than 200ms typ.
5/3 (LTC1515-X) (Pin 3): Output Voltage Select. A logic
high on the 5/3 pin will force VOUT to regulate to 5V. A logic
low will force VOUT to 3V (LTC1515-3/5) or 3.3V (LTC1515-
3.3/5). As with the SHDN pin, the 5/3 pin may be driven with
3V logic over the entire VIN range. The 5/3 pin may not float.
FB (LTC1515) (Pin 3): Feedback Input. The voltage on this
pin is compared to the internal reference voltage (1.232V)
to keep the output in regulation. An external resistor divider
is required between VOUT and FB to adjust the output
voltage. Total divider resistance should not exceed 2M.
GND (Pin 4): Ground. Should be tied to a ground plane for
best performance.
C1– (Pin 5): Charge Pump Flying Capacitor, Negative
Terminal.
4
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