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参数资料
| 型号： | LTC3216EDE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGE PUMP LED 12-DFN |
| 标准包装： | 91 |
| 应用： | 转换器，高电流 LED |
| 输入电压： | 2.9 V ~ 4.4 V |
| 输出数： | 1 |
| 输出电压： | 多重 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN（4x3） |
| 包装： | 管件 |
LTC3216
TYPICAL PERFORMANCE CHARACTERISTICS
(T A = 25°C unless otherwise speci?ed)
Charge Pump Mode Switching
V CPO
20mV/DIV
A/C COUPLED
2x Mode CPO Output Ripple
V CPO
1V/DIV
I VIN
500mA/DIV
EN2
5V/DIV
and Input Current
V IN = 3.6V
500ns/DIV
3216 G12
V IN = 3V
1ms/DIV
3216 G13
I CPO = 400mA
PIN FUNCTIONS
C2 + , C1 + , C2 – , C1 – (Pins 1, 2, 10, 12): 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
EN1/EN2 (Pins 7, 8): Inputs. The EN1 and EN2 pins are
used to select which current level is being supplied to the
LED, as well as to put the part into shutdown mode. The
truth table for these pins is as follows:
Truth Table
pump. This pin may be enabled or disabled using the EN1
and EN2 inputs. A 4.7μF X5R or X7R ceramic capacitor is
required from CPO to GND.
I SET1 /I SET2 (Pins 4, 6): LED Current Programming Resistor
Pins. The I SET1 and I SET2 pins will servo to 1.22V. Resistors
EN1
0
1
0
1
EN2
0
0
1
1
MODE
Shutdown
Low Current
High Current
Low + High Current
connected between each of these pins and GND are used
to set the high and low LED current levels. Connecting
a resistor of 2k or less will cause the LTC3216 to enter
overcurrent shutdown mode.
I LED (Pin 5): 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 via the EN1
and EN2 inputs, and the programming resistors connected
from I SET2 and I SET1 to GND.
V IN (Pin 9): Power. Supply voltage for the LTC3216. V IN
should be bypassed with a 2.2μF or greater low impedance
ceramic capacitor to GND.
GND (Pin 11): Charge Pump Ground. This pin should be
connected directly to a low impedance ground plane.
Exposed Pad (Pin 13): Control Signal Ground. This pad
must be soldered to a low impedance ground plane for
optimum thermal and electrical performance.
3216fc
5
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