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| 型号： | MAX1688ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12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 |
Step-Up DC-DC Converters with
Precise, Adaptive Current Limit for GSM
LX1
LX2
V IN
g m
ZERO
CROSSING
PEAK/
TROUGH
INDUCTOR-
CURRENT
DETECT
Q1
P-SWITCH
CONSTANT
HYSTERETIC
INDUCTOR-CURRENT
CONTROL LOGIC
N-SWITCH
Q3
Q2
P-SWITCH
REF
FB
V OUT
(LIM)
[CHG]
g m
MAX1687
MAX1688
TIMER
ON
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688 (ALSO DASHED LINES)
Figure 1. Functional Diagram
V PRECHARGE
V IN
V OUT
V IN - V DIODE
When starting up, the MAX1687/MAX1688 employ four
successive phases of operation to reduce the inrush of
current from the battery. These phases are Linear
Regulator Mode, Pseudo Buck Mode, Pseudo Boost
Mode, and Boost Mode. In Linear Mode, the output
connects to the input through a 30 ? precharge PMOS
device (Figure1, Q1). The transition from Linear Mode
to Pseudo Buck Mode occurs when V OUT = V IN - 3V.
The transition from Pseudo Buck Mode to Pseudo
Boost Mode occurs when V OUT = V IN - 0.7V. The tran-
sition from Pseudo Boost Mode to Boost Mode occurs
when V OUT > V IN . Due to these mode changes, the
battery input current remains relatively constant, and
V OUT changes slope as it rises.
Hysteretic Inductor-Current Control
Logic circuits in the MAX1687/MAX1688 control the
inductor ripple current to typically 200mA (Figure 2).
The voltage at LIM (CHG) programs I PEAK . The induc-
tor current oscillates between I PEAK - 200mA and
I PEAK .
Standby/Shutdown
When ON goes low, the device enters Standby Mode,
inductor current ramps to zero, and the output discon-
nects from the input. If ON remains low for greater than
1.2ms (typ), the device shuts down and quiescent cur-
rent drops to 3μA (typ).
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1688EUE | 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 |
| MAX1688EUE+ | 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 |
| MAX1688EUE+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 |
| MAX1688EUE-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 |
| MAX1688EUE-T | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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