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| 型号： | MAX1724EZK50+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 5V .15A TSOT23-5 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 0.8 V ~ 5.5 V |
| 电流 - 输出： | 150mA |
| 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： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-5 |
| 产品目录页面： | 1410 (CN2011-ZH PDF) |
| 其它名称： | MAX1724EZK50+TDKR |
MAX1722/MAX1723/MAX1724
1.5μA I Q , Step-Up DC-DC Converters in TSOT
V OUT
V IN
MAX1722
MAX1724
OUT
PDRV
TIMING
CIRCUIT
P
BATT
DAMPING
SWITCH
DAMP
LX
NDRV
N
GND
Figure 4. Simplified Diagram of Damping Switch
R 2 = R 1 ? OUT ? 1 ?
1V/div
1 μ s/div
Figure 5. LX Ringing Without Damping Switch (MAX1723)
BATT/Damping Switch
(MAX1722/MAX1724)
The MAX1722/MAX1724 include an internal damping
switch (Figure 4) to minimize ringing at LX and reduce
EMI. When the energy in the inductor is insufficient to
supply current to the output, the capacitance and
inductance at LX form a resonant circuit that causes
ringing. The damping switch supplies a path to quickly
dissipate this energy, suppressing the ringing at LX.
This does not reduce the output ripple, but does
reduce EMI with minimal impact on efficiency. Figures
5 and 6 show the LX node voltage waveform without
and with the damping switch, respectively.
8
1V/div
1 μ s/div
Figure 6. LX Ringing With Damping Switch (MAX1722/MAX1724)
Design Procedure
Setting the Output Voltage
(MAX1722/MAX1723)
The output voltage can be adjusted from 2V to 5.5V
using external resistors R1 and R2 (Figure 7). Since FB
leakage is 20nA (max), select feedback resistor R1 in
the 100k Ω to 1M Ω range. Calculate R2 as follows:
? V ?
? V FB ?
where V FB = 1.235V.
Maxim Integrated
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