LTC3215 データシートの表示（PDF） - Linear Technology
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LTC3215 Datasheet PDF : 14 Pages
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LTC3215
TYPICAL PERFORMANCE CHARACTERISTICS (TA = 25°C unless otherwise specified)
Charge Pump Mode Switching
and Input Current (ILED = 400mA)
VCPO
1V/DIV
IVIN
500mA/
DIV
EN2
5V/DIV
VIN = 3V
1ms/DIV
3215 G12
Efficiency vs VIN
100
90
80
70
60
50
40
30
100mA
200mA
20
400mA
10 AOT2015
VF = 3V TYP AT 200mA
0
2.8 3.0 3.2 3.4 3.6 3.8 4.0 4.2 4.4
VIN (V)
3215 G13
ISET/ILED Current Ratio
vs ILED Current
3400
3350
3300
3250
3200
25°C
85°C
–40°C
3150
3100
0
200
400
600
ILED CURRENT (mA)
800
3215 G14
PIN FUNCTIONS
C2+, C1+, C2–, C1– (Pins 1, 2, 8, 10): Charge Pump
Flying Capacitor Pins. A 2.2µF X5R or X7R ceramic ca-
pacitor should be connected from C1+ to C1– and from
C2+ to C2–.
CPO (Pin 3): Output. CPO is the output of the Charge
Pump. This pin may be enabled or disabled using the EN
input. A 4.7µF X5R or X7R ceramic capacitor is required
from CPO to GND.
ILED (Pin 4): Output. ILED is the LED current source
output. The LED is connected between CPO (anode) and
ILED (cathode). The current into the ILED pin is set by the
programming resistor connected from ISET to GND.
ISET (Pin 5): LED Current Programming Resistor Pin. The
ISET pin will servo to 1.22V. A resistor connected between
this pin and GND is used to set the LED current level. Con-
necting a resistor of 2k or less will cause the LTC3215 to
enter overcurrent shutdown mode.
EN (Pin 6): Input. The EN is used to enable the part or put
it into shutdown mode.
VIN (Pin 7): Power. Supply voltage for the LTC3215. VIN
should be bypassed with a 2.2µF or greater low impedance
ceramic capacitor to GND.
GND (Pin 9): Charge Pump Ground. This pin should be
connected directly to a low impedance ground plane.
EXPOSED PAD (Pin 11): Control Signal Ground. This pad
must be soldered to a low impedance ground plane for
optimum thermal and electrical performance.
3215fc
5
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