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参数资料
| 型号： | MAX8569EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/11页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX8569 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升 |
| 输出及类型： | 1，非隔离 |
| 电流 - 输出： | 200mA |
| 输入电压： | 1.5 ~ 5.5 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： | MAX8569 |
200mA Step-Up Converters in 6-Pin
SOT23 and TDFN
Detailed Description
The MAX8569A and MAX8569B compact high-efficien-
cy step-up converters feature low-quiescent supply cur-
rent to ensure the highest possible efficiency over a
wide load range. With a minimum 1.5V input voltage,
these devices are well suited for applications with two
alkaline cells, two nickel-metal-hydride (NiMH) cells, or
one lithium-ion (Li+) cell. When SHDN is low, the output
is connected to the battery through the inductor and an
internal p-channel MOSFET. This allows the input bat-
tery to be used as a backup or real-time clock supply
when the converter is off by eliminating the voltage drop
across the MOSFET body diode. These devices are
ideal for low-power applications where a small footprint
is critical. The internal synchronous rectifier improves
efficiency significantly and reduces size and cost by
eliminating the need for an external Schottky diode.
Control Scheme
The MAX8569A/MAX8569B feature a current-limited
control scheme that provides ultra-low quiescent current
and high efficiency over a wide output current range.
The switching cycles are not controlled by an oscillator.
Instead, switch on-time is terminated when the inductor
current reaches the 780mA (typ) n-channel current limit,
or when the 5μs maximum n-channel switch on-time is
reached. Following each on-cycle, the synchronous rec-
tifier turns on, shunts the MOSFET body diode, and the
inductor current ramps to zero before another cycle
begins. The next cycle occurs when the error compara-
tor senses that the output has fallen below the regulation
threshold.
Applications Information
Shutdown
Drive SHDN low to shut down the MAX8569A/
MAX8569B and reduce the input current to less than
1μA. During shutdown, the battery input is connected
to the output through the inductor and the internal syn-
chronous rectifier. This allows the input battery (rather
than a separate backup battery) to provide backup
power for devices such as an idled microcontroller,
SRAM, or real-time clock, without the usual diode for-
ward drop. Drive SHDN to V OUT (logic-high) to enable
the IC for normal operation.
2
BATT
OUT
5
3.3V OUTPUT
1.5V TO 3V
INPUT
C1
10 μ F
R1
220k ?
R2
1M ?
L1
10 μ H
C2
0.01 μ F
4
1
LX
SHDN
MAX8569A
GND
3
FB
6
R3
168k ?
R4
100k ?
C3
22 μ F
Figure 1. Typical Application Circuit for MAX8569A
1.5V TO 3V
INPUT C1
10 μ F
L1
10 μ H
2
4
BATT
LX
MAX8569B
OUT
RST
5
6
C3
22 μ F
R1
100k ?
3.3V
OUTPUT
RESET
OUTPUT
OFF
ON
1
SHDN
GND
3
Figure 2. Typical Application Circuit for MAX8569B
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相关代理商/技术参数 |
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|---|---|
| MAX8569EVKIT+ | 功能描述:电源管理IC开发工具 MAX8569 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX856C/D | 功能描述:直流/直流开关转换器 DICE SALES DICE RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX856C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX856CPA | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX856CSA | 功能描述:直流/直流开关转换器 3.3/5/AdjV Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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