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參數資料
| 型號： | MAX1673 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Regulated, 125mA-Output, Charge-Pump DC-DC Inverter |
| 中文描述： | 穩(wěn)壓型、125mA輸出、電荷泵DC-DC反相器 |
| 文件頁數： | 8/8頁 |
| 文件大?。?/td> | 81K |
| 代理商： | MAX1673 |
M
Regulated, 125mA-Output,
Charge-Pump DC-DC Inverter
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
_____________________Maxim Integrated Produc ts, 120 S an Gabriel Drive, S unnyvale, CA 94086 408-737-7600
1998 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
The expression for the ripple component predominantly
due to charge transfer is:
where C
FLY
and C
OUT
are their respective capacitance
values, ESR
COUT
is the equivalent series resistance of
C
OUT
, R
OUT
is the MAX1673 open-loop output imped-
ance (typically 3.5
, and f
OSC
is the MAX1673 switch-
ing frequency (typically 350kHz). If ESR
COUT
is very
small, as is likely when ceramic capacitors are used,
V
RIPPLE (TRANSFER)
dominates. If ESR is relatively
large, as with low-cost tantalum capacitors, then V
RIP-
PLE (ESR)
dominates.
When operating in LIN mode, use the following equa-
tion to approximate peak-to-peak output voltage ripple:
where C
OUT
is the output capacitor value, ESR
COUT
is
the output capacitor’s ESR, and f
OSC
is the MAX1673
oscillator frequency (typically 350kHz).
To ensure LIN mode stability over the entire tempera-
ture range, choose a low-ESR (no more than 100m
)
output capacitance using the following equation:
where C
OUT
is the output capacitor value, and f
MIN
is
the minimum oscillator frequency (250kHz). See Table
1 for a list of suggested capacitor suppliers.
Layout Considerations
The MAX1673’s high oscillator frequency requires good
layout technique, which ensures stability and helps
maintain the output voltage under heavy loads. Take
the following steps to ensure good layout:
Mount all components as close together as possible.
Place the feedback resistors R1 and R2 close to the
FB pin, and minimize the PC trace length at the FB
circuit node.
Keep traces short to minimize parasitic inductance
and capacitance.
Use a ground plane.
COUT = 75 x 10
- 6
R1
R1 + R2
OUT
I
V
=
I
2 f
C
2I
ESR
RIPPLE
OUT
OSC
OUT
OUT
COUT
+
V
f
R
(C
C
)
RIPPLE(ESR) = 2
VIN ± VOUT
OSC
1
OUT
FLY
OUT
+
V
8
f
R
C
RIPPLE(ESR) =
VIN ± VOUT
OSC
ESRCOUT
2 UT FLY
PRODUCTION METHOD
MANUFACTURER
AVX
Matsuo
Sprague
AVX
Matsuo
SERIES
TPS
267
593D, 595D
X7R
X7R
PHONE
(803) 946-0690
(714) 969-2491
(603) 224-1961
(803) 946-0590
(714) 969-2491
FAX
Surface-Mount Tantalum
(803) 448-2170
(714) 960-6492
(603) 224-1430
(803) 626-3123
(714) 960-6492
Surface-Mount Ceramic
Table 1. Partial Listing of Capacitor Vendors
___________________Chip Information
TRANSISTOR COUNT: 386
SUBSTRATE CONNECTED TO: IN
相關PDF資料 |
PDF描述 |
|---|---|
| MAX1673ESA | Regulated, 125mA-Output, Charge-Pump DC-DC Inverter |
| MAX1674 | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| MAX1674-MAX1676 | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| MAX1676EUB | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
| MAX1674EUA | High-Efficiency, Low-Supply-Current, Compact, Step-Up DC-DC Converters |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1673ESA | 功能描述:電荷泵 Regulated 125mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1673ESA+ | 功能描述:電荷泵 Regulated 125mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1673ESA+T | 功能描述:電荷泵 Regulated 125mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1673ESA-T | 功能描述:電荷泵 Regulated 125mA Charge Pump RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1674EUA | 功能描述:直流/直流開關轉換器 Compact 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 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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