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参数资料
| 型号： | MCP1252DM-BKLT |
| 厂商： | Microchip Technology |
| 文件页数： | 9/18页 |
| 文件大小： | 0K |
| 描述： | BOARD DEMO FOR MCP1252 |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 120mA |
| 输出及类型： | 1，非隔离 |
| 特点： | 短路和热保护，关闭 |
| 输入电压： | 2 ~ 5.5 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | MCP1252 |
MCP1252/3
4.0
DEVICE OVERVIEW
4.1
Theory of Operation
START
The MCP1252 and MCP1253 family of devices employ
a switched capacitor charge pump to buck or boost an
input supply voltage (V IN ) to a regulated output voltage.
Referring to the Functional Block Diagram and
tion in three phases. When the devices are not in shut-
PHASE 1:
Charge Transfer
From V IN to C FLY
down mode and a steady-state condition has been
reached, the three phases are continuously cycled
through. The first phase transfers charge from the input
to the flying capacitor (C FLY ) connected to pins C+ and
C-. This phase always occurs for half of the internal
oscillator period. During this phase, switches S 1 and S 2
are closed.
Once the first phase is complete, all switches are
opened and the second phase (idle phase) is entered.
No
1
t 1 = 2F OSC
Yes
PHASE 2:
Idle State
The device compares the internal or external feedback
voltage with an internal reference. If the feedback volt-
age is below the regulation point, the device transitions
to the third phase.
The third phase transfers energy from the flying capac-
itor to the output capacitor connected to V OUT and the
load. If regulation is maintained, the device returns to
the idle phase. If the charge transfer occurs for half the
internal oscillator period, more charge is needed in the
flying capacitor and the device transitions back to the
first phase.
The regulation control is hysteretic, otherwise referred
to as a bang-bang control. The output is regulated
around a fixed reference with some hysteresis. As a
V FB > V REF
No
PHASE 3:
Charge Transfer
From C FLY to C OUT
1
t 3 = 2F OSC
No
Yes
Yes
result, typically 50 mV of peak-to-peak ripple will be
observed at the output independent of load current.
The frequency of the output ripple, however, will be
influenced heavily by the load current and output
capacitance. The maximum frequency that will be
observed is equal to the internal oscillator frequency.
The devices automatically transition between buck or
boost operation. This provides a low-cost, compact and
simple solution for step-down/step-up DC/DC conver-
sion. This is especially true for battery-operated appli-
cations that require a fixed output above or below the
input.
? 2002 Microchip Technology Inc.
No
Yes
FIGURE 4-1:
V FB > V REF
Flow Algorithm.
DS21752A-page 9
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| MCP1252T-33X50I/MS | 功能描述:电荷泵 120mA Regulated RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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| MCP1253-33X50I/MS | 功能描述:电荷泵 120mA Regulated RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 输出电压:- 1.5 V to - 5.5 V, 3 V to 11 V 输出电流:100 mA 电源电流:1 mA 最大工作温度:+ 70 C 封装 / 箱体:SOIC-8 Narrow 封装:Tube |
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