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參數(shù)資料
| 型號： | MAX1749 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | SOT23 Vibrator Motor Driver |
| 中文描述： | SOT23封裝、震動馬達驅(qū)動器 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 108K |
| 代理商： | MAX1749 |
M
SOT23 Vibrator Motor Driver
_______________________________________________________________________________________
5
Detailed Description
The MAX1749 is a low-quiescent-current, vibrator motor dri-
ver designed for battery-powered wireless handsets and
pagers. The device supplies an adjustable +1.25V to +6.5V
output for load currents up to 120mA. The MAX1749 allows
for a constant vibration force while operating from a +2.5V
to +6.5V input voltage range.
The 1.25V bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier compares this
reference with the feedback voltage and amplifies the differ-
ence. The MOSFET driver reads the error signal and
applies the appropriate drive to the p-channel pass transis-
tor. If the feedback voltage is lower than the reference volt-
age, the pass-transistor gate is pulled lower than the
reference, allowing more current to flow and increasing the
output voltage. If the feedback voltage is too high, the pass-
transistor gate is pulled-up, allowing less current to flow to
the output. The output voltage is fed back to SET either
directly for a 1.25V fixed output or through an external resis-
tor-divider for an adjustable +1.25V to V
IN
output. Additional
blocks include a current limiter, reverse battery protection, a
thermal sensor, and ON/
OFF
logic.
Internal P-Channel Pass Transistor
The MAX1749 features a 1.1
typical P-channel MOS-
FET pass transistor. This provides several advantages
over similar designs using PNP pass transistors, includ-
ing longer battery life.
ON/OFF
LOGIC
ERROR
AMP
1.25V
REF
P
OUT
SET
GND
IN
ON
MAX1749
MOS DRIVER
WITH I
LIMIT
THERMAL
SENSOR
REVERSE
BATTERY
PROTECTION
______________________________________________________________Pin Description
Active-High On/
Off
Input. Apply a logic high to deliver power to the load. Apply a logic low to disconnect the
load and reduce the supply current to 0.1nA.
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to max-
imize thermal dissipation.
Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1μF to GND (see Capacitor
Selection and Regulator Stability).
Regulator Output. Fixed 1.25V or adjustable from 1.25V to V
IN
. Sources up to 120mA. Bypass with a 1μF,
<0.2
typical ESR capacitor to GND.
ON
1
PIN
FUNCTION
NAME
GND
2
3
OUT
4
IN
SET
5
Feedback Input for Setting the Output Voltage. Connect to OUT for 1.25V regulated output (see Output
Voltage Selection). Connect to an external resistor-divider for adjustable-output operation.
Figure 1. Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX17491GTA+ | 功能描述:功率驅(qū)動器IC Notebook MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX17491GTA+T | 功能描述:功率驅(qū)動器IC Notebook MOSFET Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX17495AATE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX17495AATE+T | 制造商:Maxim Integrated Products 功能描述:- Tape and Reel |
| MAX17496AATE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
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