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參數資料
| 型號： | MAX1774EEI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover |
| 中文描述： | 3 A SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-28 |
| 文件頁數： | 1/21頁 |
| 文件大小： | 398K |
| 代理商： | MAX1774EEI |
General Desc ription
The MAX1774 is a complete power-supply solution for
PDAs and other hand-held devices. It integrates two
high-efficiency step-down converters, a boost converter
for backup battery regulation, and four voltage detec-
tors in a small 32-pin QFN or 28-pin QSOP package.
The MAX1774 accepts inputs from +2.7V to +28V and
provides an adjustable main output from 1.25V to 5.5V
at over 2A. The secondary core converter delivers an
adjustable voltage from 1V to 5V and can deliver up to
1.5A. Both the main and core regulators have separate
shutdown inputs.
When the AC adapter power is removed, an external P-
channel MOSFET switches input to the main battery.
When the main battery is low, the backup step-up con-
verter sustains the main output voltage. When the back-
up battery can no longer deliver the required load, the
system shuts down safely to prevent damage. Four on-
board voltage detectors monitor the status of the AC
adapter power, main battery, and backup battery.
The MAX1774 evaluation kit is available to help reduce
design time.
________________________Applic ations
Hand-Held Computers
PDAs
Internet Access Tablets
POS Terminals
Subnotebooks
Pin Configurations
Features
o
Dual, High-Efficiency, Synchronous-Rectified
Step-Down Converters
o
Thin, Small (1mm High) QFN Package
o
Step-Up Converter for Backup Battery
o
Main Power
Adjustable from +1.25V to +5.5V
Over 2A Load Current
Up to 95% Efficiency
o
Core Power
Adjustable from 1V to 5V
Internal Switches
Up to 1.5A Load Current
Up to 91% Efficiency
o
Automatic Main Battery Switchover
o
100% (max) Duty Cycle
o
Up to 1.25MHz Switching Frequency
o
Input Voltage Range from +2.7V to +28V
o
Four Low-Voltage Detectors
o
170μA Quiescent Current
o
8μA Shutdown Current
o
Digital Soft-Start
o
Independent Shutdown Inputs
M
Dual, High-Effic ienc y, S tep-Down
Converter with Bac kup Battery S witc hover
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
3
3
3
2
2
2
2
B
S
S
N
L
I
L
2
N
9
1
1
1
1
1
1
L
L
32 7mm x 7mm QFN
B
O
A
D
L
1
R
17
18
19
20
21
22
23
N.C.
GND
GND
GND
GND
FBM
CS+
CS-
FBC
GND
INC
8
7
6
5
4
3
2
CVH
PDRV
IN
CVL
NDRV
PGND
PGNDC
MAX1774
1
MDRV
24
ACO
TOP VIEW
19-1810; Rev 1; 1/02
EVALUATION KIT
AVAILABLE
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
28 QSOP
32 7mm x 7mm QFN
MAX1774EEI
MAX1774EMJ
AC
ADAPTER
MAIN
BATTERY
BACKUP
BATTERY
MAIN (+3.3V)
CORE (+1.8V)
AC OK
LOW MAIN BATTERY
DEAD MAIN BATTERY
MAX1774
Func tional Diagram
Pin Configurations continued at end of data sheet.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1774EEI+ | 功能描述:直流/直流開關轉換器 Dual Step-Down w/Switchover 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 |
| MAX1774EEI+T | 功能描述:直流/直流開關轉換器 Dual Step-Down w/Switchover 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 |
| MAX1774EEI-T | 功能描述:直流/直流開關轉換器 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 |
| MAX1774EGJ | 制造商:Maxim Integrated Products 功能描述: |
| MAX1774EMJ | 功能描述:直流/直流開關轉換器 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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