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參數(shù)資料
| 型號(hào)： | MAX866EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters |
| 中文描述： | SWITCHING REGULATOR, 250 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 1.11 MM HEIGHT, ULTRA SMALL, UMAX-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 139K |
| 代理商： | MAX866EUA |
_______________Detailed Desc ription
Operating Princ iple
The MAX866/MAX867 combine a switch-mode regula-
tor, N-channel power MOSFET, precision voltage refer-
ence, and power-fail detector in a single monolithic
device. The MOSFET is a “sense-FET” type for best effi-
ciency, and has a very low gate threshold voltage to
ensure start-up with low battery voltages (0.8V typ).
PFM Control S c heme
The MAX866/MAX867 control scheme (Figure 1) com-
bines low-voltage efficiency (80% typ) with low battery
drain (100μA typ). There is no oscillator; switching is
accomplished by a pair of one shots that set a maxi-
mum LX on-time (4.5μs typ) and a minimum LX off-time
(1μs). LX on-time will be terminated early if the inductor
current reaches 0.5A before 4.5μs elapses. With the
standard application circuit (Figure 2a), LX current is
typically less than 50mA, so LX on-time is normally not
terminated by the 0.5A limit and lasts the complete
4.5μs. The LX on-resistance is typically 1
to minimize
switch losses. The MAX866/MAX867 switching frequen-
cy depends on load, input voltage, and inductor value,
and it can range up to 250kHz with typical component
values.
M
3.3V /5V or Adjustable-Output,
S ingle-Cell DC-DC Converters
_______________________________________________________________________________________
7
MAX866/MAX867
SHDN
3/5*
LBO
LBI
N
LBI COMPARATOR
ERROR COMPARATOR
CURRENT-LIMIT
COMPARATOR
ONE-SHOT
TRIG
Q
Q
ONE-SHOT
TRIG
S
Q
R
F/F
MINIMUM
OFF-TIME
ONE-SHOT
V
BATT
LX
N
GND
OUT
V
OUT
**
FB**
**
*
*
REF
REFERENCE
MAXIMUM
ON-TIME
ONE-SHOT
*MAX866 ONLY
**MAX867 ONLY
Figure 1. Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX867EUA | 3.3V/5V or Adjustable-Output, Single-Cell DC-DC Converters |
| MAX868 | Regulated, Adjustable -2x Inverting Charge Pump |
| MAX868EUB | Regulated, Adjustable -2x Inverting Charge Pump |
| MAX869LEEE | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
| MAX869 | 2A, Current-Limited, High-Side P-Channel Switch with Thermal Shutdown |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX866EUA-G062 | 制造商:Maxim Integrated Products 功能描述: |
| MAX866EUA-T | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3.3/5/AdjV 1-Cell DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)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(fēng)格:SMD/SMT |
| MAX866EVKIT-MM | 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 Evaluation Kit for the MAX866 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)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(fēng)格:SMD/SMT |
| MAX8670ETL+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8670ETL+TG069 | 制造商:Maxim Integrated Products 功能描述: |
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