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參數(shù)資料
| 型號： | MAX1724EZK50 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1.5uA IQ, Step-Up DC-DC Converters in Thin SOT23-5 |
| 中文描述： | 1.5uA智商，升壓型DC - DC轉換器，在薄型SOT23 - 5 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 292K |
| 代理商： | MAX1724EZK50 |
M
1.5μA I
Q
, Step-Up DC-DC Converters
in Thin SOT23-5
6
_______________________________________________________________________________________
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
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-
P
N
CONTROL
LOGIC
STARTUP
CIRCUITRY
DRIVER
GND
FB
OUT
LX
CURRENT
LIMIT
1.235V REFERENCE
ERROR
COMPARATOR
ZERO-
CROSSING
DETECTOR
MAX1723
SHDN
Figure 1. MAX1723 Simplified Functional Diagram
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1724EZK50+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 5PIN TSOT-23 - Cut Tape Product |
| MAX1724EZK50+T | 功能描述:直流/直流開關轉換器 1.5uA IQ Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1724EZK50-T | 功能描述:直流/直流開關轉換器 1.5uA IQ Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1725EUK | 制造商:Maxim Integrated Products 功能描述:LOW DROPOUT LINEAR REGAULATORS - Cut Tape Product |
| MAX1725EUK+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.5V TO 5V 0.08A 5PIN SOT-23 - Rail/Tube 制造商:Maxim Integrated Products 功能描述:IC, LDO lin regulator,adj,1.5-5V,MAX1725 |
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