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參數資料
| 型號： | LM2798MMX-2.0/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.12 A SWITCHED CAPACITOR REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | MSOP-10 |
| 文件頁數： | 1/14頁 |
| 文件大小： | 388K |
| 代理商： | LM2798MMX-2.0/NOPB |
LM2797/LM2798
120mA High Efficiency Step-Down Switched Capacitor
Voltage Converter with Voltage Monitoring
General Description
The LM2797/98 switched capacitor step-down DC/DC con-
verters efficiently produce a 120mA regulated low-voltage
rail from a 2.6V to 5.5V input. Fixed output voltage options of
1.5V, 1.8V, and 2.0V are available. The LM2797/98 uses
multiple fractional gain configurations to maximize conver-
sion efficiency over the entire input voltage and output cur-
rent ranges. Also contributing to high overall efficiency is the
extremely low supply current of the LM2797/98: 35A oper-
ating unloaded and 0.1A in shutdown.
Features of the LM2797/98 include input voltage and output
voltage monitoring. Pin BATOK provides battery monitoring
by indicating when the input voltage is above 2.85V (typ.).
Pin POK verifies that the output voltage is not more than 5%
(typ.) below the nominal output voltage of the part.
The optimal external component requirements of the
LM2797/98 solution minimize size and cost, making the part
ideal for Li-Ion and other battery powered designs. Two 1F
flying capacitors and two 10F bypass capacitors are all that
is required, and no inductors are needed.
The LM2797/98 also features short-circuit protection over-
temperature protection, and soft-start circuitry to prevent
excessive inrush currents. The LM2798 has a 400s turn-on
time. The turn-on time of the LM2797 is 100s.
Features
n
Output voltage options:
2.0V ± 5%, 1.8V ± 5%, and 1.5V ± 6%
n
120mA output current capability
n
Multi-Gain and Gain Hopping for Highest Possible
Efficiency - up to 90% Efficient
n
2.6V to 5.5V input range
n
Input and Output Voltage Monitoring (BATOK and POK)
n
Low operating supply current: 35A
n
Shutdown supply current: 0.1A
n
Thermal and short circuit protection
n
LM2798 turn-on time: 400s
LM2797 turn-on time: 100s
n
Available in an 10-Pin MSOP Package
Applications
n
Cellular Phones
n
Pagers
n
H/PC and P/PC Devices
n
Portable Electronic Equipment
n
Handheld Instrumentation
Typical Application Circuit
20044501
April 2003
LM2797/LM2798
120mA
High
Efficiency
Step-Down
Switched
Capacitor
V
oltage
Converter
with
V
oltage
Monitoring
2003 National Semiconductor Corporation
DS200445
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM27A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:【3∑C Accurate, 120∑C-150∑C Factory Preset Thermostat (LM27 in Die Form) |
| LM27CIM5-1HJ | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| LM27CIM5-1HJ/NOPB | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| LM27CIM5-2HJ | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
| LM27CIM5-2HJ/NOPB | 功能描述:恒溫器 RoHS:否 制造商:Maxim Integrated 功能: 開路溫度: 閉合溫度: 準確性:+/- 1 C 溫度范圍:- 55 C to + 125 C 電流額定值:500 uA 電壓額定值:2.7 V to 5.5 V 產品:Thermostats |
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