參數(shù)資料
型號(hào)： MAX1687EUE
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, PDSO16
封裝： 4.40 MM, 0.65 MM PITCH, MO-153AC, TSSOP-16
文件頁(yè)數(shù)： 7/12頁(yè)
文件大?。?/td> 210K
代理商： MAX1687EUE
M
S tep-Up DC-DC Converters with
Prec ise, Adaptive Current Limit for GS M
_______________________________________________________________________________________
7
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 Induc tor-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
.
S tandby/S hutdown
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).
Q3
REF
FB
V
OUT
V
OUT
V
PRECHARGE
V
IN
g
m
ON
( ) ARE FOR MAX1687
[ ] ARE FOR MAX1688 (ALSODASHED LINES)
(LIM)
[CHG]
g
m
V
IN
-
V
DIODE
CONSTANT
HYSTERETIC
INDUCTOR-CURRENT
CONTROL LOGIC
PEAK/
TROUGH
INDUCTOR-
CURRENT
DETECT
Q2
P-SWITCH
N-SWITCH
ZERO
CROSSING
P-SWITCH
LX2
Q1
LX1
V
IN
MAX1687
MAX1688
TIMER
Figure 1. Functional Diagram
相關(guān)PDF資料
PDF描述
MAX1688EUE Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM
MAX1692 Low-Noise, 5.5V-Input, PWM Step-Down Regulator
MAX1692EUB Low-Noise, 5.5V-Input, PWM Step-Down Regulator
MAX1719 Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP 0 to 0
MAX1719EUT Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP 0 to 0
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1687EUE+ 功能描述:直流/直流開關(guān)轉(zhuǎn)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(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
MAX1687EUE+T 功能描述:直流/直流開關(guān)轉(zhuǎn)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(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
MAX1687EUE-T 功能描述:直流/直流開關(guān)轉(zhuǎn)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(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
MAX1688ESA 功能描述:直流/直流開關(guān)轉(zhuǎn)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(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
MAX1688ESA+ 功能描述:直流/直流開關(guān)轉(zhuǎn)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(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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