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| 型号： | MAX1724EVKIT |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12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
OUT
MAX1723
STARTUP
CIRCUITRY
ZERO-
CROSSING
DETECTOR
P
SHDN
FB
ERROR
COMPARATOR
1.235V REFERENCE
CONTROL
LOGIC
DRIVER
CURRENT
LIMIT
N
LX
GND
Figure 1. MAX1723 Simplified Functional Diagram
Detailed Description
The MAX1722/MAX1723/MAX1724 compact, high-effi-
ciency, step-up DC-DC converters are guaranteed to
start up with voltages as low as 0.91V and operate with
an input voltage down to 0.8V. Consuming only 1.5μA of
quiescent current, these devices include a built-in syn-
chronous rectifier that reduces cost by eliminating the
need for an external diode and improves overall efficien-
cy by minimizing losses in the circuit (see Synchronous
Rectification section). The MAX1722/MAX1724 feature a
clamp circuit that reduces EMI due to inductor ringing.
The MAX1723/MAX1724 feature an active-low shutdown
that reduces quiescent supply current to 0.1μA. The
MAX1722/MAX1723 have an adjustable output voltage,
while the MAX1724 is available with four fixed-output
voltage options (see Selector Guide). Figure 1 is the
MAX1723 simplified functional diagram and Figure 2 is
the MAX1724 simplified functional diagram.
PFM Control Scheme
A forced discontinuous, current-limited, pulse-frequency-
modulation (PFM) control scheme is a key feature of the
6
MAX1722/MAX1723/MAX1724. This scheme provides
ultra-low quiescent current and high efficiency over a
wide output current range. There is no oscillator; the
inductor current is limited by the 0.5A N-channel cur-
rent limit or by the 5μs switch maximum on-time.
Following each on cycle, the inductor current must
ramp to zero before another cycle may start. When the
error comparator senses that the output has fallen
below the regulation threshold, another cycle begins.
Synchronous Rectification
The internal synchronous rectifier eliminates the need
for an external Schottky diode, thus reducing cost and
board space. While the inductor discharges, the P-
channel MOSFET turns on and shunts the MOSFET
body diode. As a result, the rectifier voltage drop is sig-
nificantly reduced, improving efficiency without the
addition of external components.
Low-Voltage Startup Circuit
The MAX1722/MAX1723/MAX1724 contain a low-volt-
age startup circuit to control DC-DC operation until the
output voltage exceeds 1.5V (typ). The minimum start-
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1724EZK27 | 制造商:Maxim Integrated Products 功能描述:1.5UA IQ STEP-UP DC-DC CONVERTERS - Cut Tape Product |
| MAX1724EZK27+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 5PIN TSOT-23 - Rail/Tube |
| MAX1724EZK27+T | 功能描述:直流/直流开关转换器 1.5uA IQ 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 |
| MAX1724EZK27-T | 功能描述:直流/直流开关转换器 1.5uA IQ 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 |
| MAX1724EZK30 | 制造商:Maxim Integrated Products 功能描述:1.5UA IQ STEP-UP DC-DC CONVERTERS - Rail/Tube |
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