19-3048; Rev 1; 5/04
Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
General Description
The MAX1589 low-dropout linear regulator operates
from a +1.62V to +3.6V supply and delivers a guaran-
teed 500mA continuous load current with a low 175mV
dropout. The high-accuracy (±0.5%) output voltage is
preset to internally trimmed voltages from +0.75V to
+3.0V. An active-low, open-drain reset output remains
asserted for at least 70ms after the output voltage reach-
es regulation. This device is offered in 6-pin thin SOT23
and 6-pin 3mm x 3mm thin DFN packages.
An internal PMOS pass transistor maintains low supply
current, independent of load and dropout voltage, making
the MAX1589 ideal for portable battery-powered equip-
ment such as personal digital assistants (PDAs), digital
still cameras, cell phones, cordless phones, and note-
book computers. Other features include logic-controlled
shutdown, short-circuit protection, and thermal-
overload protection.
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♦
♦
Features
Low 1.62V Minimum Input Voltage
Guaranteed 500mA Output Current
±0.5% Initial Accuracy
Low 175mV Dropout at 500mA Load
70ms
RESET
Output Flag
Supply Current Independent of Load and Dropout
Voltage
Logic-Controlled Shutdown
Thermal-Overload and Short-Circuit Protection
Preset Output Voltages (0.75V, 1.0V, 1.3V, 1.5V,
1.8V, 2.5V, and 3.0V)
Tiny 6-Pin Thin SOT23 Package (<1.1mm High)
Thin 6-Pin TDFN Package (<0.8mm High)
MAX1589
Ordering Information
PART*
MAX1589EZT_ _ _-T
MAX1589ETT_ _ _
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 Thin SOT23-6
6 TDFN
Applications
Notebook Computers
Cellular and PCS Telephones
Personal Digital Assistants (PDAs)
Hand-Held Computers
Digital Still Cameras
PCMCIA Cards
CD and MP3 Players
*Insert
the desired three-digit suffix (see the Selector Guide) into
the blanks to complete the part number. Contact the factory for
other output voltages.
Selector Guide
V
OUT
(V)
0.75
1.00
1.30
1.50
1.80
2.50
3.00
SUFFIX
075
100
130
150
180
250
300
MAX1589
TOP MARK
SOT
AAAT
AAAU
AAAV
AAAW
AAAX
AAAY
AAAZ
TDFN
AFJ
AFK
AFL
AFM
AFN
AFO
AFP
Typical Operating Circuit
INPUT
1.62V TO 3.6V
C
IN
1µF
IN
OUT
OUTPUT
500mA 0.75V TO 3.0V
C
OUT
4.7µF
TOP VIEW
Pin Configurations
IN
1
6
OUT
OUT
I.C.
1
2
3
6
IN
SHDN
MAX1589
ON
SHDN
OFF
RESET
LOGIC
SUPPLY
MAX1589
100kΩ
TO
µC
GND
2
5
I.C.
RESET
MAX1589
5
4
GND
SHDN
3
4
RESET
TDFN
3mm x 3mm
GND
THIN SOT23
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
MAX1589
ABSOLUTE MAXIMUM RATINGS
IN,
SHDN, RESET
to GND .....................................-0.3V to +4.0V
OUT to GND ................................................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +70°C)
6-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW
6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ..................................................... +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V
IN
= (V
OUT
+ 0.5V) or V
IN
= 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Input Voltage
Input Undervoltage Lockout
Output Voltage Accuracy
Maximum Output Current
Current Limit
Ground Current
Dropout Voltage
Load Regulation
Line Regulation
Output Noise
PSRR
SHUTDOWN
Shutdown Supply Current
SHDN
Input Logic Levels
SHDN
Input Bias Current
Turn-On Delay
RESET
OUTPUT
Reset Threshold Accuracy
RESET
Output Low Voltage
V
OL
V
OUT
falling (1.7% typical hysteresis)
I
RESET
= 100µA
V
IN
= +1.0V, I
RESET
= 100µA
80
82.5
1.5
3
85
100
100
%V
OUT
mV
I
OFF
V
IH
V
IL
I
SHDN
SHDN
= GND
V
IN
= 1.62V to 3.6V
V
IN
= 1.62V to 3.6V
V
SH DN
= 0 or 3.6V
T
A
= +25°C
T
A
= +85°C
1
5
90
T
A
= +25°C
T
A
= +85°C
1.4
0.6
300
0.001
0.01
1
µA
V
nA
µs
I
OUT
I
LIM
I
Q
V
IN
- V
OUT
∆V
LDR
∆V
LNR
SYMBOL
V
IN
V
UVLO
V
IN
rising (180mV typical hysteresis)
I
OUT
= 150mA, T
A
= +25°C
I
OUT
= 1mA to 500mA,
V
IN
= (V
OUT
+ 0.5V) to +3.6V
Continuous
V
OUT
= 96% of nominal value
No load
I
OUT
= 500mA
Dropout (Note 2)
I
OUT
= 500mA, V
OUT
≥
1.8V (Note 2)
I
OUT
= 1mA to 500mA
V
IN
= (V
OUT
+ 0.5V) to +3.6V, I
OUT
= 100mA
10Hz to 100kHz, I
OUT
= 10mA
f < 1kHz, I
OUT
= 10mA
-0.15
CONDITIONS
MIN
1.62
1.30
-0.5
-1.5
500
550
850
70
90
70
175
0.02
+0.01
86
70
350
0.5
+0.15
mV
%
%/V
µV
RMS
dB
1150
140
µA
TYP
MAX
3.60
1.60
+0.5
+1.5
%
mA
RMS
mA
UNITS
V
V
From
SHDN
high to OUT high, V
OUT
= 1.5V
2
_______________________________________________________________________________________
Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= (V
OUT
+ 0.5V) or V
IN
= 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= -40°C to +85°C, unless other-
wise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
RESET
Output High
Leakage Current
Reset Delay
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
SHDN
∆T
SHDN
+165
15
°C
°C
SYMBOL
I
OH
t
RP
CONDITIONS
V
RESET
= 3.6V,
RESET
not asserted
T
A
= +25°C
T
A
= +85°C
70
MIN
TYP
0.001
0.01
100
160
MAX
1
UNITS
µA
ms
MAX1589
From V
OUT
high to
RESET
rising
Note 1:
Limits are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
The dropout voltage is defined as V
IN
- V
OUT
, when V
OUT
is 4% lower than the value of V
OUT
when V
IN
= V
OUT
+ 0.5V.
Typical Operating Characteristics
(V
IN
= (V
OUT
+ 0.5V) or 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX1589 toc01
OUTPUT VOLTAGE ACCURACY
vs. INPUT VOLTAGE
MAX1589 toc02
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
V
OUT
= +1.5V
OUTPUT VOLTAGE ACCURACY (%)
1.0
0.5
I
OUT
= 0mA, 100mA, 500mA
0
-0.5
-1.0
-1.5
MAX1589 toc03
0.2
OUTPUT VOLTAGE ACCURACY (%)
0.50
V
OUT
= +1.5V
OUTPUT VOLTAGE ACCURACY (%)
0.25
I
OUT
= 0mA
0
I
OUT
= 100mA
-0.25
I
OUT
= 500mA
1.5
0.1
V
OUT
= +1.5V
0
V
OUT
= +3.0V
-0.1
V
OUT
= +0.75V
-0.2
0
100
200
300
400
500
LOAD CURRENT (mA)
-0.50
1.4
1.8
2.2
2.6
3.0
3.4
INPUT VOLTAGE (V)
-40
-15
10
35
60
85
TEMPERATURE (°C)
GROUND-PIN CURRENT
vs. LOAD CURRENT
MAX1589 toc04
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
I
OUT
= 100mA
GROUND-PIN CURRENT (µA)
100
80
60
40
20
V
OUT
= +1.5V
0
I
OUT
= 0mA
I
OUT
= 500mA
MAX1589 toc05
GROUND-PIN CURRENT
vs. TEMPERATURE
V
OUT
= +1.5V
GROUND-PIN CURRENT (µA)
90
I
OUT
= 1mA TO 500mA
80
MAX1589 toc06
120
110
100
V
OUT
= +1.5V
90
V
OUT
= +0.75V
80
70
60
0.01
0.1
1
10
100
V
OUT
= +3.0V
120
100
GROUND-PIN CURRENT (µA)
70
I
OUT
= 0mA
60
50
1.2
1.6
2.0
2.4
2.8
3.2
3.6
-40
-15
10
35
60
85
INPUT VOLTAGE (V)
TEMPERATURE (°C)
1000
LOAD CURRENT (mA)
_______________________________________________________________________________________
3
Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
MAX1589
Typical Operating Characteristics (continued)
(V
IN
= (V
OUT
+ 0.5V) or 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1589 toc07
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
80
70
60
V
OUT
= +3.0V
PSRR (dB)
V
OUT
= +1.5V
V
OUT
= +0.75V
200
160
V
DROPOUT
(mV)
120
V
OUT
= +1.8V
V
OUT
= +3.0V
50
40
30
20
10
I
OUT
= 10mA
0.1
1
10
FREQUENCY (kHz)
100
1000
80
40
0
0
100
200
300
400
500
LOAD CURRENT (mA)
0
LINE-TRANSIENT RESPONSE
MAX1589 toc09
LINE-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1589 toc10
4V
V
IN
3.5V
500mV/div
2.5V
V
IN
1.8V
500mV/div
V
OUT
I
LOAD
= 100mA
V
OUT
= 1.5V
40µs/div
1.5V
10mV/div
AC-COUPLED
V
OUT
I
LOAD
= 100mA
V
OUT
= 1.5V
40µs/div
1.5V
10mV/div
AC-COUPLED
LOAD-TRANSIENT RESPONSE
MAX1589 toc11
LOAD-TRANSIENT RESPONSE
MAX1589 toc12
200mA
I
OUT
20mA
200mA/div
500mA
I
OUT
100mA
500mA/div
V
OUT
0
20mV/div
AC-COUPLED
V
OUT
50mV/div
AC-COUPLED
V
IN
= 1.8V
V
OUT
= 1.5V
20µs/div
V
IN
= 3.6V
V
OUT
= 1.5V
20µs/div
4
_______________________________________________________________________________________
Low-Input-Voltage, 500mA LDO Regulator
with
RESET
in SOT and TDFN
MAX1589
Typical Operating Characteristics (continued)
(V
IN
= (V
OUT
+ 0.5V) or 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN RESPONSE
MAX1589 toc13
SHUTDOWN/RESET RESPONSE
MAX1589 toc14
R
L
= 25Ω
V
OUT
= 1.5V
V
SHDN
0
V
OUT
V
OUT
500mV/div
0
100µs/div
V
RESET
0
40ms/div
0
1V/div
V
SHDN
0
R
L
= 25Ω
V
OUT
= 1.5V
1V/div
1V/div
1V/div
LINE/RESET RESPONSE
MAX1589 toc15
R
L
= 25Ω
V
OUT
= 1.5V
V
IN
0
V
OUT
0
V
RESET
0
200ms/div
1V/div
1V/div
2V/div
_______________________________________________________________________________________
5
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