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參數(shù)資料
| 型號： | MAX848-MAX849 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
| 中文描述： | 1節(jié)至3節(jié)電池，大功率，低噪聲，升壓型DC - DC轉(zhuǎn)換器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 166K |
| 代理商： | MAX848-MAX849 |
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
General Desc ription
The MAX848/MAX849 boost converters set a new stan-
dard of high efficiency and high integration for noise-
sensitive power-supply applications, such as portable
phones and small systems with RF data links. The heart
of the these devices is a synchronous boost-topology
regulator that generates a fixed 3.3V output (or 2.7V to
5.5V adjustable output) from one to three NiCd/NiMH
cells or one Li-Ion cell.
Synchronous rectification provides a 5% efficiency
improvement over similar nonsynchronous boost regu-
lators. In standby mode, pulse-skipping PFM operation
keeps the output voltage alive with only 150μW quies-
cent power consumption. Fixed-frequency PWM opera-
tion ensures that the switching noise spectrum is limited
to the 300kHz fundamental and its harmonics, allowing
easy post-filtering noise reduction. For even tighter
noise spectrum control, synchronize to a 200kHz to
400kHz external clock.
Battery monitoring is provided by a two-channel, volt-
age-to-frequency analog-to-digital converter (ADC).
One channel is intended for a single-cell battery input
(0.625V to 1.875V range), while the other channel is for
monitoring higher voltages (0V to 2.5V range).
Two control inputs are provided for push-on, push-off
control via a momentary pushbutton switch. Upon
power-up, an internal comparator monitors the output
voltage to generate a power-good output (POK).
The devices differ only in the current limit of the
N-channel MOSFET power switch: 0.8A for the
MAX848, and 1.4A for the MAX849.
Features
o
Up to 95% Efficiency
(see Typical Output Selector Guide below)
o
3.3V Dual Mode or 2.7V to 5.5V Adj. Output
o
0.7V to 5.5V Input Range
o
0.15mW Standby Mode
o
300kHz PWM Mode or Synchronizable
o
Two-Channel ADC with Serial Output
o
Power-Good Function
Applic ations
PCS Phones
Digital Cordless Phones
Cellular Phones
Hand-Held Instruments
Palmtop Computers
Personal Communicators
Local 3.3V to 5V Supplies
M
1-Cell to 3-Cell, High-Power,
Low-Noise, S tep-Up DC-DC Converters
________________________________________________________________ Maxim Integrated Products
1
AIN1
AIN2
AINSEL
DATA
ON1
ON2
CLK/SEL
POKIN
LX
OUT
POUT
POK
FB
MAX848
MAX849
OUTPUT
A/D CHANNEL 1 IN
A/D CHANNEL 2 IN
A/D CHANNEL SELECT
A/D OUTPUT
ON/OFF CONTROL
SYNC INPUT
INPUT
0.8V TO5.5V
VOLTAGE MONITOR
OUTPUT
REF
GND
PGND
Typic al Operating Circ uit
19-1095; Rev 2; 12/97
PART
MAX848
ESE
MAX849
ESE
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
16 Narrow SO
16 Narrow SO
Ordering Information
Pin Configuration appears at end of data sheet.
Dual Mode is a trademark of Maxim Integrated Products.
Typic al Output S elec tor Guide
V
IN
(V)
V
OUT
(V)
3.3
5
3.3
5
3.3
5
3.3
5
5
MAX849 I
OUT
(mA)
100
70
300
200
750
500
800
600
1000
MAX848 I
OUT
(mA)
70
40
110
70
200
130
250
150
300
0.9
1.2
2.4
2.7
3.6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX849ESE | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
| MAX848ESE | 1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters |
| MAX848 | Low-Noise, Step-Up DC-DC Converters(高功率，低噪，帶0.5AMOSFET功率開關(guān),步升DC-DC變換器) |
| MAX849 | Low-Noise, Step-Up DC-DC Converters(高功率，低噪，帶0.5AMOSFET功率開關(guān),步升DC-DC變換器) |
| MAX8530 | Dual Low-Dropout Linear Regulators with RESETor Low-Noise Output in UCSP or QFN |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX849ESE | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX849ESE+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX849ESE+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX849ESE-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-3 Cell Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
| MAX849EVKIT | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 1-Cell to 3-Cell High-Power Low-Noise Step-Up DC-DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(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 |
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