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MAX1749EUK-T
SOT23 Vibrator Motor Driver
General DescriptionThe 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.
________________________ApplicationsWireless Handset Vibrator Motor Drivers
Pager Vibrator Motor Drivers
____________________________FeaturesFixed 1.25V or Adjustable (1.25V to 6.5V) OutputLow CostThermal Overload ProtectionOutput Current LimitReverse Battery ProtectionLow 0.1nA Off Supply CurrentLow 80μA Full-Load Supply Current
MAX1749
SOT23 Vibrator Motor Driver
Pin Configuration
Typical Operating Circuit19-1455; Rev 1; 6/99
MAX1749
SOT23 Vibrator Motor Driver
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +3.6V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
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................................................-0.3V to (VIN+ 0.3V)
Continuous Power Dissipation (TA= +70°C)
SOT23-5 (derate 7.1mW/°C above +70°C).................571mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°CJA...............................................................................+140°C/W
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed through cor-
relation using Statistical Quality Control (SQC) methods.
Note 2:Not tested. For design purposes, the current limit should be considered 120mA minimum to 420mA maximum.
MAX1749
SOT23 Vibrator Motor DriverREGION OF STABLE COUT ESR
vs. LOAD CURRENT
MAX1749 toc08
LOAD CURRENT (mA)
OUT
ESR (1
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1749 toc04
INPUT VOLTAGE (V)
SUPPLY CURRENT (
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX1749 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
__________________________________________Typical Operating Characteristics(VIN = +3.6V, SET = OUT, CIN= 1μF, COUT= 1μF, TA= +25°C, unless otherwise noted.)
MAX1749
SOT23 Vibrator Motor DriverILOAD = 0 to 50mA, CIN = 10μF, VOUT = AC-COUPLED
LOAD-TRANSIENT RESPONSE1.25V
1.24V
1.23V
ILOAD
20mA/div
10μs/div
MAX1749 toc10
VOUT
VIBRATOR MOTOR LOAD
ON/OFF WAVEFORM (VIN = 3.6V)2V
200mA
0V
0mA
ILOAD
100ms/div
VON
VOUT
MAX1749 toc14
ILOAD = 50mA, CIN = 10μF, VOUT = AC-COUPLED
LINE-TRANSIENT RESPONSE1.25V
1.24V
1.23V
4.6V
3.6V
VIN
50μs/div
MAX1749 toc09
VOUT
VIBRATOR MOTOR LOAD
ON/OFF WAVEFORM (VIN = 5.0V)200mA
0V
0mA
ILOAD
100ms/div
MAX1749 toc13
VON
VOUT
Typical Operating Characteristics (continued)(VIN = +3.6V, SET = OUT, CIN= 1μF, COUT= 1μF, TA= +25°C, unless otherwise noted.)
MAX1749
SOT23 Vibrator Motor Driver
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 VINoutput. Additional
blocks include a current limiter, reverse battery protection, a
thermal sensor, and ON/OFFlogic.
Internal P-Channel Pass TransistorThe MAX1749 features a 1.1Ωtypical P-channel MOS-
FET pass transistor. This provides several advantages
over similar designs using PNP pass transistors, includ-
ing longer battery life.
______________________________________________________________Pin Description
MAX1749
SOT23 Vibrator Motor DriverThe P-channel MOSFET requires no base drive current,
which reduces quiescent current considerably. PNP-
based regulators waste considerable amounts of base
current under large loads. The MAX1749 does not suf-
fer from these problems and consumes only 80μA of
quiescent current independent of the load (see Typical
Operating Characteristics).
Output Voltage SelectionTo select the preset 1.25V output, connect OUT directly
to SET. To adjust the output (1.25V to 6.5V), use two
external resistors connected as a voltage divider to SET
(Figure 2). The output voltage is set by the following
equation:
VOUT= VSET(1 + R1 / R2)
where VSET= 1.25V. To simplify resistor selection:
Choose R2 = 100kWto optimize power consumption,
accuracy, and high-frequency power-supply rejection.
The total current through the external resistive feedback
and load should not be less than 10μA.
ON/OOFFFF
Drive ON high to provide power to the load. Drive ON
low to disable power to the load and reduce the supply
current to typically 0.1nA (1μA max). Refer to the
ON/OFFwaveforms in the Typical Operating Char-
acteristics. When ON goes high, output current rises to
the current limit until VOUTreaches regulation. While in
regulation, the output current drops to a lower value
sufficient to maintain motor speed. When ON goes low,
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.
Current LimitThe MAX1749 includes a current limiter that monitors
and controls the pass transistor’s gate voltage, estimat-
ing the output current and limiting it to about 280mA.
For design purposes, the current limit should be con-
sidered 120mA (min) to 420mA (max). The output can
be shorted to ground for an infinite time period without
damaging the part.
Thermal-Overload ProtectionThermal-overload protection limits total power dissipa-
tion in the MAX1749. When the junction temperature
exceeds TJ= +170°C, the thermal sensor sends a sig-
nal to the ON/OFFlogic, turning off the pass transistor
and allowing the IC to cool. The thermal sensor will turn
the pass transistor on again after the IC’s junction tem-
perature cools by typically 20°C, resulting in a pulsed
output during continuous thermal-overload conditions.
Operating Region and Power DissipationMaximum power dissipation of the MAX1749 depends
on the thermal resistance of the case and circuit board,
the temperature difference between the die junction
and ambient air, and the rate of air flow. The power dis-
sipation across the device is P = IOUT(VIN- VOUT). The
resulting maximum power dissipation is:
PMAX= (TJ- TA) / qJA
where (TJ- TA) is the temperature difference between
the MAX1749 die junction and the surrounding air, andJAis +140°C/W.
GND performs the dual function of providing an electri-
cal connection to ground and channeling heat away.
Connect GND to a large pad or ground plane.
Reverse Battery ProtectionThe MAX1749 has a unique protection scheme that lim-
its the reverse supply current to less than 1mA when
either VINor VONfalls below ground. The circuitry moni-
tors the polarity of these two pins, disconnecting the
internal circuitry and parasitic diodes when the battery
is reversed. This feature prevents the device from over-
heating and damaging the battery.
VIN> 5.5V Minimum Load CurrentWhen operating the MAX1749 with an input voltage
above 5.5V, the minimum current through the external
feedback resistors and load must be 30μA.
