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参数资料
| 型号： | LTC3217EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR FLASH TORCH 16QFN |
| 标准包装： | 121 |
| 拓扑： | PWM，升压（升压），切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 1.15MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LTC3217
TYPICAL PERFORMANCE CHARACTERISTICS
1.5x Mode CPO Voltage
vs Load Current
T A = 25°C unless otherwise noted.
2x Mode CPO Voltage
vs Load Current
4.8
C2 = C3 = C4 = 2.2μF
5.2
C2 = C3 = C4 = 2.2μF
5.1
4.6
4.4
3.4V
3.5V
5.0
4.9
3.6V
4.2
4.0
3.8
3.3V
3.2V
3.1V
V BAT = 3V
3.6V
4.8
4.7
4.6
4.5
4.4
4.3
3.3V
3.2V
3.1V
V BAT = 3V
3.6
0
100
200 300 400
500
4.2
0
100
200
300
400
500
LOAD CURRENT (mA)
3217 G13
PIN FUNCTIONS
C1P, C2P, C1M, C2M (Pins 1, 16, 14, 12): Charge Pump
Flying Capacitor Pins. A 2.2μF X7R or X5R ceramic capacitor
should be connected from C1P to C1M and C2P to C2M.
CPO (Pin 2): Output of the charge pump used to power
all LEDs. This pin is enabled or disabled using the EN1
and EN2 inputs. A 2.2μF X5R or X7R ceramic capacitor
should be connected to ground.
EN1, EN2 (Pins 3, 11): Inputs. The EN1 and EN2 pins are
used to select which current level is being supplied to the
LEDs, as well as to put the part into shutdown mode. The
truth table for these pins is as follows:
LOAD CURRENT (mA)
3217 G14
in between CPO (anodes) and LED1 – 4 (cathodes). The
current to each LED output is set via the EN1 and EN2
inputs, and the programming resistors connected from
I SET1 and I SET2 to GND. With the LTC3217, any of the four
LED outputs can be disabled by connecting the output
directly to CPO. 10μA of current will ?ow through each
directly connected LED output. For single LED applications,
all four LED pins may be tied together and will accurately
share current.
GND2 (Pin 8): Analog Ground. This pin should be con-
nected directly to a low impedance ground plane.
Truth Table
EN1
0
1
0
1
EN2
0
0
1
1
MODE
Shutdown
Low Current
High Current
Low + High Current
I SET1 /I SET2 (Pins 9, 10): LED Current Programming Re-
sistor Pins. The I SET1 and I SET2 pins will servo to 1.22V.
Resistors connected between each of these pins and
GND are used to set the high and low LED current levels.
Connecting a resistor 2k or less will cause the LTC3217
to enter overcurrent shutdown.
GND1 (Pin 13): Charge Pump Ground. This pin should be
EN2 can be used for PWM of the LED currents. For proper
operation, the minimum pulse width should be 50μs and
the maximum low time should be 1ms if EN1 is low. If EN1
is high then the 1ms low time limitation does not apply.
LED1, LED2, LED3, LED4 (Pins 4, 5, 6, 7): LED1 to LED4
are the current source outputs. Each LED is connected
connected directly to a low impedance ground plane.
V BAT (Pin 15): Supply Voltage. This pin should be bypassed
with a 2.2μF, or greater low ESR ceramic capacitor.
Exposed Pad (Pin 17): This pad should be connected
directly to a low impedance ground plane for optimal
thermal and electrical performance.
3217fa
5
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