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参数资料
| 型号： | MAX1724EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | EVAL KIT STEP-UP MAX1722-MAX1724 |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 3.3V，3.6V |
| 电流 - 输出： | 100mA |
| 输入电压： | 0.91 ~ 3.3 V |
| 稳压器拓扑结构： | 升压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX1722，MAX1723，MAX1724 |
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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