MAX1749EUK Fast Delivery |IC PHOENIX CO.,LIMITED

MAX1749EUK ,SOT23 Vibrator Motor DriverApplications Ordering InformationWireless Handset Vibrator Motor DriversPIN- TOPPART TEMP. RANGEPag ..
MAX1749EUK-T ,SOT23 Vibrator Motor DriverApplications Ordering InformationWireless Handset Vibrator Motor DriversPIN- TOPPART TEMP. RANGEPag ..
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MAX1749EUK
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.
________________________Applications
Wireless 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
SOT23-5
TOP VIEW
GND
OUTIN5SETON
MAX174924
Pin Configuration
MAX1749
OUT
GNDSET
COUT
1μF
CIN
1μF
BATTERY
1.25V
UP TO 120mA2.5V TO 6.5V
OFF
Typical Operating Circuit
19-1455; Rev 1; 6/99
PART
MAX1749EUK-T-40°C to +85°C
TEMP. RANGEPIN-
PACKAGE
5 SOT23
Ordering Information
TOP
MARK
ADIX
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
0.05100IONON Input Bias Current
0.4VIL
ON Input High Threshold2.0VIH2.56.5VINInput Voltage80200IQGround Pin Current
1.131.251.37VVOUTOutput Voltage120Maximum Output Current
UNITSMINTYPMAXSYMBOLPARAMETER
ON = IN
CONDITIONS280ILIMCurrent Limit (Note 2)
0.1mA ≤IOUT≤50mA, SET = OUT
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.= +85°C= +25°CnA
ON Input Low ThresholdV
0.5TA= +85°C= +25°CnA0.0310ISETSET Input Leakage CurrentVSET = 1.4V170TSHDNThermal Shutdown Temperature20ΔTSHDNThermal Shutdown Hysteresis0.00011IOFFOff Supply CurrentVOUT= VON= GND0.02
ON INPUT
SET INPUT
THERMAL PROTECTION= +85°C= +25°C
MAX1749
SOT23 Vibrator Motor Driver
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
MAX1749 toc08
LOAD CURRENT (mA)
OUT
ESR (1
STABLE REGION
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1749 toc04
INPUT VOLTAGE (V)
SUPPLY CURRENT (ILOAD = 50mA
ILOAD = 0
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX1749 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
ILOAD = 50mA
SUPPLY CURRENT
vs. TEMPERATURE
MAX1749 toc06
TEMPERATURE (°C)
SUPPLY CURRENT (
ILOAD = 50mA
__________________________________________Typical Operating Characteristics
(VIN = +3.6V, SET = OUT, CIN= 1µF, COUT= 1µF, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX1749 TOC01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
SUPPLY CURRENT vs. LOAD CURRENT
MAX1749toc02
LOAD CURRENT (mA)
SUPPLY CURRENT (
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
MAX1749toc03
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
MAX1749
SOT23 Vibrator Motor Driver
ILOAD = 0 to 50mA, CIN = 10mF, VOUT = AC-COUPLED
LOAD-TRANSIENT RESPONSE
1.25V
1.24V
1.23V
ILOAD
20mA/div
10ms/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 = 10mF, VOUT = AC-COUPLED
LINE-TRANSIENT RESPONSE
1.25V
1.24V
1.23V
4.6V
3.6V
VIN
50ms/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 Transistor
The 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.
ON/OFF
LOGIC
ERROR
AMP
1.25V
REF
OUT
SET
GND
MAX1749
MOS DRIVER
WITH ILIMIT
THERMAL
SENSOR
REVERSE
BATTERY
PROTECTION
______________________________________________________________Pin Description
Active-High On/OffInput. 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.ON1
PINFUNCTIONNAME
GND2Ground. 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).
OUT4Regulator Output. Fixed 1.25V or adjustable from 1.25V to VIN. Sources up to 120mA. Bypass with a 1µF,
<0.2Ωtypical ESR capacitor to GND.
SET5Feedback 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
MAX1749
SOT23 Vibrator Motor Driver
The 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 Selection
To 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 Limit
The 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 Protection
Thermal-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 Dissipation
Maximum 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 Protection
The 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 Current
When operating the MAX1749 with an input voltage
above 5.5V, the minimum current through the external
feedback resistors and load must be 30µA.R2V1OUT
SET
MAX1749
OUT
SET
GND
COUTFVIBRATOR
CIN
1µFBATTERY
OUTPUT
VOLTAGE
OFF
Figure 2. Adjustable Output Using External Feedback
Resistors

Partno	Mfg	Dc	Qty	Available	Descript
MAX1749EUK	MAXIM	N/a	9	avai	SOT23 Vibrator Motor Driver