Maxim MAX1749EUK-T Datasheet
General Description
The MAX1749 allows for a constant vibration force while
operating from a +2.5V to +6.5V input range and delivering 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
IN
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 available 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
1
Pin Configuration
MAX1749
OUT
GND
IN
ON SET
C
OUT
1µF
C
IN
1µF
BATTERY
1.25V
UP TO 120mA
2.5V TO 6.5V
ON
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
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.
TOP VIEW
GND
1
ON
2
3
IN
5
SET
MAX1749
OUT
4
SOT23-5
MAX1749
SOT23 Vibrator Motor Driver
2 _______________________________________________________________________________________
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 (V
IN
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
SOT23-5 (derate 7.1mW/°C above +70°C) .................571mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
θ
JA
...............................................................................+140°C/W
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
0.05
0 100
I
ON
ON Input Bias Current
V
0.4V
IL
ON Input High Threshold 2.0V
IH
V2.5 6.5V
IN
Input Voltage
µA80 200I
Q
Ground Pin Current
1.13 1.25 1.37 VV
OUT
Output Voltage
mA120Maximum Output Current
UNITSMIN TYP MAXSYMBOLPARAMETER
ON = IN
CONDITIONS
mA280I
LIM
Current Limit (Note 2)
0.1mA ≤ I
OUT
≤ 50mA, SET = OUT
Note 1: Limits are 100% production tested at T
A
= +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.
TA= +85°C
TA= +25°C
nA
ON Input Low Threshold V
0.5TA= +85°C
TA= +25°C
nA
0.03 10
I
SET
SET Input Leakage Current V
SET
= 1.4V
°C170T
SHDN
Thermal Shutdown Temperature
°C20∆T
SHDN
Thermal Shutdown Hysteresis
µA
0.0001 1
I
OFF
Off Supply Current V
OUT
= VON= GND
0.02
ON INPUT
SET INPUT
THERMAL PROTECTION
TA= +85°C
TA= +25°C
MAX1749
SOT23 Vibrator Motor Driver
_______________________________________________________________________________________
3
)
__________________________________________Typical Operating Characteristics
(V
IN
= +3.6V, SET = OUT, CIN= 1µF, C
OUT
= 1µF, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT
1.27
1.26
1.25
1.24
1.23
OUTPUT VOLTAGE (V)
1.22
1.21
0406020 80 100 120
LOAD CURRENT (mA)
SUPPLY CURRENT vs. LOAD CURRENT
100
90
MAX1749 TOC01
80
70
60
50
40
30
SUPPLY CURRENT (µA)
20
10
0
04020 60 80 100 120
LOAD CURRENT (mA)
1.4
1.2
MAX1749toc02
1.0
0.8
0.6
OUTPUT VOLTAGE (V)
0.4
0.2
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
0
0123456
INPUT VOLTAGE (V)
MAX1749toc03
SUPPLY CURRENT
vs. INPUT VOLTAGE
120
100
80
60
40
SUPPLY CURRENT (µA)
20
0
0123456
INPUT VOLTAGE (V)
SUPPLY CURRENT
vs. TEMPERATURE
100
I
= 50mA
LOAD
90
80
70
60
50
40
30
SUPPLY CURRENT (µA)
20
10
0
TEMPERATURE (°C
I
LOAD
I
LOAD
= 50mA
= 0
100806040200-20-40
MAX1749 toc04
MAX1749 toc06
OUTPUT VOLTAGE
vs. TEMPERATURE
1.28
1.27
1.26
1.25
1.24
OUTPUT VOLTAGE (V)
1.23
1.22
1.21
-40 10-15 35 60 85
TEMPERATURE (°C)
REGION OF STABLE C
vs. LOAD CURRENT
10
1
ESR (Ω)
OUT
C
STABLE REGION
0.1
0.01
0608020 40 100 120
LOAD CURRENT (mA)
I
LOAD
OUT
= 50mA
MAX1749 toc05
ESR
MAX1749 toc08
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