參數(shù)資料
型號： LTC3215
廠商： Linear Technology Corporation
英文描述： 700mA Low Noise High Current LED Charge Pump
中文描述： 700mA的低噪音，高電流LED電荷泵
文件頁數(shù)： 5/12頁
文件大?。?/td> 162K
代理商： LTC3215
LTC3215
5
3215f
PIU
C2
+
, C1
+
, C2
–
, C1
–
(Pins 1, 2, 8, 10):
Charge Pump
Flying Capacitor Pins. A 2.2
μ
F X5R or X7R ceramic
capacitor 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 4.7
μ
F X5R or X7R ceramic capacitor is required
from CPO to GND.
I
LED
(Pin 4):
Output. I
LED
is the LED current source output.
The LED is connected between CPO (anode) and I
LED
(cathode). The current into the I
LED
pin is set by the
programming resistor connected from I
SET
to GND.
BLOCK DIAGRA
2
3
4
11
9
10
5
–
+
1
8
1X MODE: CPO = V
1.5X MODE: CPO = 4.6V
2X MODE: CPO = 5.1V
V
REF
DROPOUT
DETECTOR
CONTROL
LOGIC
MODE
CONTROL
OSCILLATOR
6
7
GND
CPO
I
LED
GND
I
SET
V
IN
EN
C1
+
C1
–
C2
+
C2
–
3215 BD
CURRENT
SOURCE
CONTROL
I
SET
(Pin 5):
LED Current Programming Resistor Pin. The
I
SET
pin will servo to 1.22V. A resistor connected between
this pin and GND is used to set the LED current level.
Connecting 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.
V
IN
(Pin 7):
Power. Supply voltage for the LTC3215. V
IN
should be bypassed with a 2.2
μ
F 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.
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