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| 型号： | MCP1640T-I/MC |
| 厂商： | Microchip Technology |
| 文件页数： | 12/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 0.1A 8DFN |
| 标准包装： | 3,300 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2 V ~ 5.5 V |
| 输入电压： | 0.8 V ~ 5.5 V |
| 频率 - 开关： | 500kHz |
| 电流 - 输出： | 100mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
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MCP1640/B/C/D
4.2
Functional Description
The MCP1640/B/C/D is a compact, high-efficiency,
fixed frequency, step-up DC-DC converter that
provides an easy-to-use power supply solution for
applications powered by either one-cell, two-cell, or
three-cell alkaline, NiCd, or NiMH, or one-cell Li-Ion or
Li-Polymer batteries.
VOUT
MCP1640/B/C/D.
VIN
INTERNAL
BIAS
DIRECTION
CONTROL
I ZERO
SW
EN
GATE DRIVE
AND
SHUTDOWN
CONTROL
.3V
0V
SOFT-START
I LIMIT
LOGIC
I SENSE
GND
OSCILLATOR
SLOPE
COMP.
S
PWM/PFM
LOGIC
1.21V
FB
EA
FIGURE 4-1:
MCP1640/B/C/D Block Diagram.
4.2.1
LOW-VOLTAGE START-UP
50% of its nominal value. Once the output voltage
The MCP1640/B/C/D is capable of starting from a low
input voltage. Start-up voltage is typically 0.65V for a
3.3V output and 1 mA resistive load.
When enabled, the internal start-up logic turns the
rectifying P-Channel switch on until the output
capacitor is charged to a value close to the input
voltage. The rectifying switch is current-limited during
this time. After charging the output capacitor to the
input voltage, the device starts switching. If the input
voltage is below 1.6V, the device runs open-loop with a
fixed duty cycle of 70% until the output reaches 1.6V.
During this time, the boost switch current is limited to
DS22234B-page 12
reaches 1.6V, normal closed-loop PWM operation is
initiated.
The MCP1640/B/C/D charges an internal capacitor
with a very weak current source. The voltage on this
capacitor, in turn, slowly ramps the current limit of the
boost switch to its nominal value. The soft-start
capacitor is completely discharged in the event of a
commanded shutdown or a thermal shutdown.
There is no undervoltage lockout feature for the
MCP1640/B/C/D. The device will start up at the lowest
possible voltage and run down to the lowest possible
voltage. For typical battery applications, this may result
in “motor-boating” (emitting a low-frequency tone) for
deeply discharged batteries.
? 2011 Microchip Technology Inc.
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