|
|
PDF MAX1749 Data sheet ( Hoja de datos )
| Número de pieza | MAX1749 | |
| Descripción | SOT23 Vibrator Motor Driver | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX1749 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
19-1455; Rev 1; 6/99
SOT23 Vibrator Motor Driver
General Description
The MAX1749 allows for a constant vibration force while
operating from a +2.5V to +6.5V input range and deliver-
ing up to 120mA. A PMOS pass transistor allows the
80µA supply current to remain independent of the load.
The output voltage can be adjusted from +1.25V to VIN
with an external resistor-divider. When turned off
(ON = low), the MAX1749 supply current drops to 1µA
(max) to minimize battery drain. Other features include
short-circuit protection, thermal shutdown protection,
and reverse battery protection. The MAX1749 is avail-
able in a 5-pin SOT23 package.
____________________________Features
o Fixed 1.25V or Adjustable (1.25V to 6.5V) Output
o Low Cost
o Thermal Overload Protection
o Output Current Limit
o Reverse Battery Protection
o Low 0.1nA Off Supply Current
o Low 80µA Full-Load Supply Current
________________________Applications
Wireless Handset Vibrator Motor Drivers
Pager Vibrator Motor Drivers
Ordering Information
PART
MAX1749EUK-T
TEMP. RANGE
-40°C to +85°C
PIN-
PACKAGE
5 SOT23
TOP
MARK
ADIX
Typical Operating Circuit
2.5V TO 6.5V
CIN
1µF
BATTERY
ON
OFF
IN OUT
MAX1749
ON SET
GND
1.25V
UP TO 120mA
COUT
1µF
Pin Configuration
TOP VIEW
ON 1
5 SET
MAX1749
GND 2
IN 3
4 OUT
SOT23-5
________________________________________________________________ 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.
1 page  
SOT23 Vibrator Motor Driver
______________________________________________________________Pin Description
PIN NAME
FUNCTION
1
ON
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.
2
GND
Ground. This pin also functions as a heatsink. Solder to large pads or the circuit board ground plane to max-
imize thermal dissipation.
3
IN
Regulator Input. Supply voltage can range from +2.5V to +6.5V. Bypass with 1µF to GND (see Capacitor
Selection and Regulator Stability).
4
OUT
Regulator Output. Fixed 1.25V or adjustable from 1.25V to VIN. Sources up to 120mA. Bypass with a 1µF,
<0.2Ω typical ESR capacitor to GND.
5
SET
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.
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 VIN 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 1.1Ω typical P-channel MOS-
FET pass transistor. This provides several advantages
over similar designs using PNP pass transistors, includ-
ing longer battery life.
IN REVERSE
BATTERY
ON PROTECTION
MAX1749
ON/OFF
LOGIC
ERROR
AMP
MOS DRIVER
WITH ILIMIT
P
OUT
SET
THERMAL
SENSOR
1.25V
REF
GND
Figure 1. Functional Diagram
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX1749.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX174 | Complete 12-Bit ADCs | Maxim Integrated |
| MAX1740 | SIM/Smart Card Level Translators in MAX | Maxim Integrated |
| MAX17401 | 1-Phase Quick-PWM Intel IMVP-6/GMCH Controller | Maxim Integrated |
| MAX17409 | 1-Phase Quick-PWM NVIDIA CPU Controller |  Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |