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參數(shù)資料
| 型號： | MAX1686 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM |
| 中文描述： | 3V至5V穩(wěn)壓型電荷泵，用于SIM卡 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1686 |
M
S tep-Up DC-DC Converters with
Prec ise, Adaptive Current Limit for GS M
8
_______________________________________________________________________________________
S ync hronized ON Pin
If desired, drive ON low during periods of high current
demand to eliminate switching noise from affecting
sensitive RF circuitry. During the periods when ON is
low, the output reservoir capacitor provides current to
the load (Figure 4).
Buc k Capability
Although the IC is not intended for this application, the
MAX1687/MAX1688 operate as a buck converter when
the input voltage is higher than the output voltage. The
MAX1687/MAX1688 are not optimally efficient in this
mode (see Typical Operating Characteristics for
efficiencies at 2.7V, 3.3V, 5V, and 6V input supply volt-
ages).
Applic ations Information
Adjusting the Output V oltage
Adjust the MAX1687/MAX1688 output voltage with two
external resistors (Figure 3). Choose R2 to be between
10k
to 100k
. Calculate R1 as follows:
R1 = R2
·
(V
OUT
- V
FB
) / V
FB
where V
FB
is the feedback threshold voltage, 1.25V
nominal.
Adjusting Current Limit (MAX 1687)
The MAX1687 has an adjustable current limit for appli-
cations requiring limited supply current, such as PC
card sockets or applications with variable burst loads.
For single Li-Ion battery cell applications, the high peak
current demands of the RF transmitter power amplifier
can pull the battery very low as the battery impedance
increases toward the end of discharge. The reservoir
capacitor at the output supplies power during load-cur-
rent bursts; this allows for a lower input current limit.
With this feature, the life of the Li-Ion battery versus the
reservoir capacitor size trade-off can be optimized for
each application.
( ) ARE FOR MAX1688
I
PEAK
- 200mA
I
PEAK
SET BY
V
LIM
(V
CHG
)
HYSTERESIS
BAND
C
TIME
Figure 2. Hysteretic Inductor Current
OUT
V
OUT
R1
R2
R1 = R2
OUT
FB
V
( )
FB
MAX1687
MAX1688
Figure 3. Setting the Output Voltage
“ON”
CONTROL INPUT
V
OUT
I
LOAD
TIME
Figure 4. Timing Diagram of “ON”
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1687EUE | Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1686EUA | 功能描述:電荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1686EUA+ | 功能描述:電荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1686EUA+T | 功能描述:電荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1686EUA-T | 功能描述:電荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| MAX1686HEUA | 功能描述:電荷泵 3-5V Regulating Chrg Pump For SIM Cards RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
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