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參數資料
| 型號： | MAX1687ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM |
| 中文描述： | 0.9 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數： | 1/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1687ESA |
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
General Desc ription
The MAX1687/MAX1688 step-up DC-DC converters deliv-
er up to 2W from a single Li-Ion or three NiMH cells. The
devices are ideal for burst-load applications such as GSM
cell phones and wireless LANs, where the RF power
amplifiers require short, high current bursts. The
MAX1687/MAX1688 reduce battery surge current by slow-
ly charging a reservoir capacitor, which supplies the nec-
essary peak energy for the load current burst. As a result,
the peak battery current is limited, thus maximizing battery
life and minimizing battery voltage sag and transient dips.
An internal synchronous rectifier provides over 90% con-
version efficiency and eliminates the need for an external
Schottky diode. A logic shutdown mode reduces the shut-
down current to only 3μA. The devices can be disabled
during current bursts (RF transmit mode) to eliminate
switching noise.
The switching frequency of the MAX1687/MAX1688, con-
trolled by the selected inductor, can exceed 1MHz. Two
external resistors set the output voltage from 1.25V to 6V.
The MAX1687 controls peak battery current, while the
MAX1688 features a more advanced, adaptive constant-
recharge-time algorithm that maximizes battery life. The
MAX1687/MAX1688 are available in thin 16-pin TSSOP
(1.1mm max height) or standard 8-pin SO packages.
Applic ations
GSM Phones
Wireless Handsets
PC Cards (PCMCIA)
Features
o
Low 450mA Peak Battery Current
Provides 2A, 5V GSM Burst
o
90% Efficiency
o
Internal Power MOSFETs and Current-Sense
Resistor
o
Output Disconnects from Input During Shutdown
o
3μA Shutdown Current
o
Precise Voltage-Controlled Current Limit
(MAX1687)
o
Adaptive Constant-Recharge-Time Capability
(MAX1688)
o
1.25V to 6V Adjustable Output
o
2.7V to 6V Input Range
(1 Li-Ion cell or 3 NiMH cells)
o
Switching Frequency Can Exceed 1MHz
o
Standby Mode Disables DC-DC During
Transmission Burst
o
Low Inrush Current at Start-Up
M
/
S tep-Up DC-DC Converters with
Prec ise, Adaptive Current Limit for GS M
________________________________________________________________ Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
IN
OUT
OUT
LX2
LX2
PGND
PGND
AGND
ON
TOP VIEW
MAX1687
MAX1688
TSSOP
IN
LX1
FB
LX1
LIM [CHG]
REF
N.C.
[ ] ARE FOR MAX1688
Pin Configurations continued at end of data sheet.
MAX1687
MAX1688
V
OUT
UP TO6V
OUT
IN
LX1
LX2
ON
ON
2.7V TO6V
OFF
0 TO1V
CONTROL INPUT
1 Li-lon
OR
3 NiMH
OR
3 ALKALINE
(LIM)
REF
FB
[CHG]
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688
GND
Typic al Operating Circ uit
19-1426; Rev 0; 2/99
EVALUATION KIT MANUAL
PART*
MAX1687
EUE
MAX1687ESA
MAX1688
EUE
MAX1688ESA
*U.S. and foreign patents pending.
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
16 TSSOP
8 SO
16 TSSOP
8 SO
Pin Configurations
Ordering Information
Patent pending
FOLLOWS DATA SHEET
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1687ESA+ | 功能描述:直流/直流開關轉換器 StepUp w/Prec Adapt Crnt Limit for GSM 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 |
| MAX1687ESA+T | 功能描述:直流/直流開關轉換器 StepUp w/Prec Adapt Crnt Limit for GSM 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 |
| MAX1687ESA-T | 功能描述:直流/直流開關轉換器 StepUp w/Prec Adapt Crnt Limit for GSM 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 |
| MAX1687EUE | 功能描述:直流/直流開關轉換器 StepUp w/Prec Adapt Crnt Limit for GSM 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 |
| MAX1687EUE+ | 功能描述:直流/直流開關轉換器 StepUp w/Prec Adapt Crnt Limit for GSM 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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