Datasheet

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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 V

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.

________________________Applications

Wireless Handset Vibrator Motor Drivers

Pager Vibrator Motor Drivers

____________________________Features

♦ Fixed 1.25V or Adjustable (1.25V to 6.5V) Output

♦ Low Cost

♦ Thermal Overload Protection

♦ Output Current Limit

♦ Reverse Battery Protection

♦ Low 0.1nA Off Supply Current

♦ Low 80µA Full-Load Supply Current

MAX1749

SOT23 Vibrator Motor Driver

________________________________________________________________

Maxim Integrated Products

SOT23-5

TOP VIEW

GND

OUT

SET

MAX1749

Pin Configuration

MAX1749

OUT

GND

ON SET

OUT

1µF

BATTERY

1.25V

UP TO 120mA

2.5V TO 6.5V

OFF

Typical Operating Circuit

19-1455; Rev 1; 6/99

PART

MAX1749EUK-T -40°C to +85°C

TEMP. RANGE

PIN-

PACKAGE

5 SOT23

Ordering Information

TOP

MARK

ADIX

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Summary of content (8 pages)

PAGE 1
9-1455; Rev 1; 6/99 SOT23 Vibrator Motor Driver ____________________________Features ♦ Fixed 1.25V or Adjustable (1.25V to 6.5V) Output ♦ Low Cost ♦ Thermal Overload Protection ♦ Output Current Limit ♦ Reverse Battery Protection ♦ Low 0.1nA Off Supply Current ♦ Low 80µA Full-Load Supply Current ________________________Applications Ordering Information Wireless Handset Vibrator Motor Drivers Pager Vibrator Motor Drivers PART TEMP.
PAGE 2
MAX1749 SOT23 Vibrator Motor Driver ABSOLUTE MAXIMUM RATINGS IN to GND ....................................................................-7V to +7V Output Short-Circuit Duration ............................................Infinite SET to GND ..............................................................-0.3V to +7V ON to GND ..................................................................-7V to +7V ON to IN....................................................................-7V to +0.3V OUT to GND .....
PAGE 3
SOT23 Vibrator Motor Driver 90 1.25 1.24 1.23 1.2 OUTPUT VOLTAGE (V) 80 SUPPLY CURRENT (µA) 1.26 1.4 MAX1749toc02 100 MAX1749 TOC01 1.27 70 60 50 40 30 20 1.22 1.0 0.8 0.6 0.4 0.2 10 0 0 40 60 80 100 120 0 20 LOAD CURRENT (mA) 40 60 80 100 0 120 1 2 SUPPLY CURRENT vs. INPUT VOLTAGE 4 5 6 OUTPUT VOLTAGE vs. TEMPERATURE 1.28 MAX1749 toc04 120 ILOAD = 50mA 1.27 OUTPUT VOLTAGE (V) 100 ILOAD = 50mA 80 3 INPUT VOLTAGE (V) LOAD CURRENT (mA) 60 ILOAD = 0 40 20 1.26 1.
PAGE 4
Typical Operating Characteristics (continued) (VIN = +3.6V, SET = OUT, CIN = 1µF, COUT = 1µF, TA = +25°C, unless otherwise noted.) MAX1749 toc09 1.25V 1.24V VOUT MAX1749 toc10 LOAD-TRANSIENT RESPONSE LINE-TRANSIENT RESPONSE 1.25V 1.24V VOUT 1.23V 1.23V 4.6V ILOAD 20mA/div VIN 3.6V 10µs/div ILOAD = 0 to 50mA, CIN = 10µF, VOUT = AC-COUPLED 50µs/div ILOAD = 50mA, CIN = 10µF, VOUT = AC-COUPLED ON/OFF WAVEFORM (VIN = 3.6V) ON/OFF WAVEFORM (VIN = 5.
PAGE 5
SOT23 Vibrator Motor Driver 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 maximize 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).
PAGE 6
MAX1749 SOT23 Vibrator Motor Driver IN CIN BATTERY 1µF ON OFF Current Limit MAX1749 ON OUTPUT VOLTAGE OUT the regulator turns off; however, inertial energy in the motor exhibits a slow output voltage decline. The MAX1749 is designed to withstand this condition with no negative effects. R1 SET R2 GND COUT 1µF VIBRATOR The MAX1749 includes a current limiter that monitors and controls the pass transistor’s gate voltage, estimating the output current and limiting it to about 280mA.
PAGE 7
SOT23 Vibrator Motor Driver Chip Information TRANSISTOR COUNT: 148 Use a 1µF capacitor on the input and a 1µF capacitor on the output of the MAX1749. A higher-value input capacitor (10µF) may be necessary if large, fast transients are anticipated and the device is located several inches from the power source. Improve load-transient response and stability by using larger output capacitors. For stable operation over the full temperature range with load currents up to 120mA, use a 1µF min capacitor (ESR < 0.
PAGE 8
MAX1749 SOT23 Vibrator Motor Driver NOTES Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.