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| 型号： | MAX1687ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 2.5A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 6 V |
| 输入电压： | 2.7 V ~ 6 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
19-1426; Rev 0; 2/99
KIT MA
EVALU
TA SHE
FOLLO
ATION ET
WS DA
NUAL
Step-Up DC-DC Converters with
Precise, Adaptive Current Limit for GSM
General Description
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
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
Ordering Information
(1.1mm max height) or standard 8-pin SO packages.
Applications
GSM Phones
PART
MAX1687 EUE
MAX1687ESA
MAX1688 EUE
MAX1688ESA
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
8 SO
16 TSSOP
8 SO
Wireless Handsets
PC Cards (PCMCIA)
Pin Configurations
Typical Operating Circuit
TOP VIEW
IN 1
16 OUT
2.7V TO 6V
1 Li-lon
OR
IN
LX1
LX2
OUT
V OUT
UP TO 6V
IN 2
15 OUT
3 NiMH
LX1 3
LX1 4
MAX1687
14 LX2
13 LX2
OR
3 ALKALINE
MAX1687
MAX1688
FB
LIM [CHG] 5
MAX1688
12 PGND
OFF
ON
ON
FB 6
11 PGND
0 TO 1V
CONTROL INPUT
(LIM)
REF 7
10 AGND
REF
[CHG]
N.C. 8
[ ] ARE FOR MAX1688
TSSOP
9
ON
GND
Pin Configurations continued at end of data sheet.
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688
________________________________________________________________ Maxim Integrated Products
1
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.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1687EUE | 功能描述:直流/直流开关转换器 StepUp w/Prec Adapt Crnt Limit for GSM RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1687EUE+ | 功能描述:直流/直流开关转换器 StepUp w/Prec Adapt Crnt Limit for GSM RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1687EUE+T | 功能描述:直流/直流开关转换器 StepUp w/Prec Adapt Crnt Limit for GSM RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1687EUE-T | 功能描述:直流/直流开关转换器 StepUp w/Prec Adapt Crnt Limit for GSM RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1688ESA | 功能描述:直流/直流开关转换器 StepUp w/Prec Adapt Crnt Limit for GSM RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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