LT1500 데이터 시트보기 (PDF) - Linear Technology
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LT1500 Datasheet PDF : 16 Pages
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LT1500/LT1501
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating
temperature range.
Note 1: Feedback pin or output is held sightly above the regulated value to
force the VC node low and switching to stop.
Note 2: See Typical Performance Characteristics for graph of Guaranteed
Switch Voltage vs Saturation Voltage.
Note 3: Peak switch current is the guaranteed minimum value of switch
current available in normal operation. Highest calculated switch current at
full load should not exceed the minimum value shown.
Note 4: Loading on FB pin will affect NFB reference voltage. ∆VNFB = IFB/gm.
Do not exceed 10µA loading on FB when NFB is being used.
Note 5: This is the delay between sense pin current reaching its upper or
lower threshold and switch transition. Switch delay times cause peak-to-
peak inductor current to increase and therefore switching frequency to be
low. This effect will be significant for frequencies above 100kHz. See
Application Information and Typical Performance Characteristics.
Note 6: Reference voltage under all conditions includes VIN = 2.1V to 15V,
all loads and full temperature range.
Note 7: As with all boost regulators the output voltage of the LT1500
cannot fall to less than input voltage because of the path through the catch
diode. This means that the output voltage divider on adjustable parts will
still be generating feedback voltage at the FB pin (fixed voltage parts have
an internal switch to disconnect the divider in shutdown). If the voltage on
FB is greater than 0.6V in shutdown, the internal error amplifier will draw
current that adds to shutdown current. See graph of Shutdown Current vs
FB voltage in Typical Performance Characteristics.
TYPICAL PERFORMANCE CHARACTERISTICS
Switching Frequency
(3.3V Output)
1000
VIN = 2.3V
10µH
100
10
0
20µH
50µH
100µH
BURST REGION
50 100 150 200 250 300
LOAD CURRENT (mA)
LTC1500/01 • TPC20
Efficiency (3.3V Output)
100
90
L = 100µH
80
70
L = 10µH
L = 33µH
60
50
40
TJ = 25°C
VIN = 2.3V
LOW LOSS INDUCTOR
30
1
10
100
LOAD CURRENT (mA)
1000
LTC1500/01 • TPC17
Switching Frequency (5V Output)
1000
VIN = 3V
10µH
20µH
100
50µH
100µH
10
0
BURST REGION
50 100 150 200 250 300
LOAD CURRENT (mA)
LTC1500/01 • TPC21
Efficiency (5V Output)
100
90
L = 100µH
80
70 L = 10µH
L = 33µH
60
50
40 VIN = 3V
LOW LOSS INDUCTOR
30
1
10
100
LOAD CURRENT (mA)
1000
LTC1500/01 • TPC18
Switching Frequency (12V Output)
1000
VIN = 5V
10µH
20µH
50µH
100µH
100
BURST REGION
10
0 25 50 75 100 125 150 175 200
LOAD CURRENT (mA)
LTC1500/01 • TPC22
Efficiency (12V Output)
100
90
L = 100µH
80
70
L = 10µH
L = 33µH
60
50
40 VIN = 5V
LOW LOSS INDUCTOR
30
1
10
100
LOAD CURRENT (mA)
1000
LTC1500/01 • TPC19
4
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