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| 型号： | MCP1650DM-LED2 |
| 厂商： | Microchip Technology |
| 文件页数： | 12/28页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP1650 WHITE LED |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 15mA |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 32.4V |
| 特点： | 可调光 |
| 输入电压： | 2.7 ~ 4.5V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP1650 |
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MCP1650/51/52/53
3.0
PIN DESCRIPTIONS
TABLE 3-1:
PIN FUNCTION TABLE
Pin No. Pin No. Pin No. Pin No.
MCP1650 MCP1651 MCP1652 MCP1653
Symbol
Function
1
2
3
4
5
—
—
—
8
1
2
3
4
5
6
7
—
8
1
2
3
4
5
—
—
7
8
1
2
3
4
6
7
8
9
10
EXT
GND
CS
FB
SHDN
LBI
LBO
PG
V IN
External Gate Drive
Ground
Current Sense
Feedback Input
Shutdown
Low Battery Input
Low Battery Output
Power Good Output
Input Voltage
3.1
External Gate Drive (EXT)
3.6
Low Battery Input (LBI)
EXT is the output pin that drives the external N-channel
MOSFET on and off during boost operation. EXT is
equal to GND for SHDN or UVLO conditions.
LBI is the input pin for the low battery comparator.
When the voltage on this pin falls below the nominal
1.22V threshold setting, the LBO (Low Battery Output)
open-drain is active-low.
3.2 Circuit Ground (GND)
Connect the GND pin to circuit ground. See layout
3.7
Low Battery Output (LBO)
guidelines for suggested grounding physical layout.
3.3 Current Sense (CS)
Input peak current is sensed on CS through the exter-
LBO is an active-low, open-drain output capable of
sinking 10 mA when the LBI pin is below the threshold
voltage. LBO is high-impedance during SHDN or UVLO
conditions.
nal current sense resistor. When the sensed current is
converted to a voltage, the current sense threshold is
3.8
Power Good (PG)
122 mV below V IN typical. If that threshold is exceeded,
the pulse is terminated asynchronously.
3.4 Feedback Input (FB)
Connect output voltage of boost converter through
external resistor divider to the FB pin for voltage
PG is an active-high, open-drain output capable of
sinking 10 mA when the FB input pin is 15% below its
typical value or more than 15% above its typical value,
indicating that the output voltage is out of regulation.
PG is high impedance during SHDN or UVLO
condition.
regulation. The nominal voltage that is compared to this
input for pulse termination is 1.22V.
3.9
Input Voltage (V IN )
3.5
Shutdown Input (SHDN)
V IN is an input supply pin. Tie 2.7V to 5.5V input power
source.
The SHDN input is used to turn the boost converter on
and off. For normal operation, tie this pin high or to V IN .
To turn off the device, tie this pin to low or ground.
DS21876A-page 12
? 2004 Microchip Technology Inc.
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