19-3684; Rev 0; 5/05
Low-Input-Voltage, 300mA LDO Regulators
with
RESET
in SOT and TDFN
General Description
The MAX1963A/MAX1976A low-dropout linear regula-
tors operate from a +1.62V to +3.6V supply and deliver
a guaranteed 300mA continuous load current with a low
100mV dropout. The high-accuracy (±0.5%) output
voltage is preset to an internally trimmed voltage in the
+0.75V to +3.0V range. An active-low, open-drain reset
output remains asserted for at least 2.2ms (MAX1963A)
or 70ms (MAX1976A) after the output voltage reaches
regulation. These devices are offered in thin SOT23 and
thin DFN packages. An internal pMOS pass transistor
allows the low supply current to remain independent of
load and dropout voltage, making these devices ideal for
portable battery-powered equipment.
♦
Low 1.62V Minimum Input Voltage
♦
Guaranteed 300mA Output Current
♦
±2.5% Accuracy Over Load/Line/Temp
♦
Low 100mV Dropout at 300mA Load
♦
2.2ms (MAX1963A) or 70ms (MAX1976A)
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 to 3.0V)
♦
Tiny 6-Pin Thin SOT23 Package (<1.1mm High)
♦
TDFN Package (<0.8mm High)
Features
MAX1963A/MAX1976A
Applications
Notebook/Handheld Computers
Cellular/Smart/PDA Phones
DSC, CD/MP3 Players
PCMCIA Cards
Ordering Information
PART*
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 6 Thin SOT23-6
-40°C to +85°C 6 TDFN-6 3mm x 3mm
-40°C to +85°C 8 TDFN-8 2mm x 2mm
-40°C to +85°C 6 Thin SOT23-6
-40°C to +85°C 6 TDFN-6 3mm x 3mm
-40°C to +85°C 8 TDFN-8 2mm x 2mm
MAX1963AEZT_
_ _-T
MAX1963AETT_ _ _-T
SHDN
N.C.
IN
GND
Pin Configurations
TOP VIEW
8
IN
1
6
OUT
MAX1963AETA_ _ _-T
MAX1976AEZT_
_ _-T
MAX1976AETT_ _ _-T
MAX1976AETA_ _ _-T
7
6
5
GND
2
MAX1963A
MAX1976A
5
I.C.
MAX1963A
MAX1976A
1
OUT
2
N.C.
3
I.C.
4
RESET
*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.
SHDN
3
4
RESET
Typical Operating Circuit
INPUT
1.62V TO 3.6V
C
IN
1µF
IN
OUT
UP TO
300mA
OUTPUT
0.75V TO 3.0V
C
OUT
LOGIC
4.7µF SUPPLY
100kΩ
ON
SHDN
OFF
GND
RESET
TO
µC
THIN SOT23
SHDN
GND
4
IN
TDFN
2mm x 2mm
6
5
MAX1963A
MAX1976A
1
OUT
2
I.C.
3
RESET
MAX1963A
MAX1976A
TDFN
3mm x 3mm
Selector Guide appears at end of data sheet.
________________________________________________________________
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, 300mA LDO Regulators
with
RESET
in SOT and TDFN
MAX1963A/MAX1976A
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 SOT23 (derate 9.1mW/°C above +70°C)............727mW
6-Pin TDFN (derate 24.4mW/°C above +70°C) .........1951mW
8-Pin TDFN (derate 11.9mW/°C above +70°C) ........953.5mW
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 1.8V, whichever is greater;
SHDN
= IN, C
IN
= 1µF, C
OUT
= 4.7µF, T
A
= -40°C to +85°C, unless otherwise
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
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
SHDN
= 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
100
0.001
0.01
1
µA
V
nA
µs
I
OUT
I
LIM
I
Q
SYMBOL
V
IN
V
UVLO
V
IN
rising or falling
(180mV typical hysteresis)
I
OUT
= 1mA to 300mA,
V
IN
= (V
OUT
+ 0.5V) to +3.6V
Continuous
V
OUT
= 96% of nominal value
No load
I
OUT
= 300mA
Dropout (Note 2)
V
IN
- V
OUT
I
OUT
= 300mA, V
OUT
≥
1.8V (Note 2)
∆V
LDR
∆V
LNR
I
OUT
= 1mA to 300mA
V
IN
= (V
OUT
+ 0.5V) to +3.6V, I
OUT
= 1mA
10Hz to 100kHz, I
OUT
= 10mA, V
OUT
= 1.5V
f < 1kHz, I
OUT
= 10mA
-0.15
CONDITIONS
MIN
1.62
1.30
-2.5
300
450
550
70
90
70
100
0.02
+0.01
86
70
200
0.3
+0.15
mV
%
% /V
µV
RMS
dB
650
140
µA
±0.5
TYP
MAX
3.60
1.60
+2.5
UNITS
V
V
%
mA
RMS
mA
From
SHDN
high to OUT high, V
OUT
= 1.8V
2
_______________________________________________________________________________________
Low-Input-Voltage, 300mA LDO Regulators
with
RESET
in SOT and TDFN
ELECTRICAL 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
= -40°C to +85°C, unless otherwise
noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
RESET
OUTPUT
Reset Threshold Accuracy
RESET
Output Low Voltage
RESET
Output High Leakage
Reset Delay
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
T
SHDN
∆T
SHDN
+165
15
°C
°C
V
OL
I
OH
t
RP
V
OUT
falling (1.7% typical hysteresis)
I
RESET
= 100µA
V
IN
= +1.0V, I
RESET
= 100µA
V
RESET
= 3.6V,
RESET
not asserted
From V
OUT
high to
RESET
rising
T
A
= +25°C
T
A
= +85°C
MAX1963A
MAX1976A
2.2
70
80
82.5
1
30
0.001
0.01
3.2
100
5.5
160
85
100
400
1
%V
OUT
mV
µA
ms
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX1963A/MAX1976A
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
MAX1963/76 toc01
OUTPUT VOLTAGE ACCURACY
vs. INPUT VOLTAGE
MAX1963/76 toc02
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
V
OUT
= +1.5V
OUTPUT VOLTAGE ACCURACY (%)
1.0
0.5
I
OUT
= 0mA, 100mA, 300mA
0
-0.5
-1.0
-1.5
MAX1963/76 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
= 300mA
1.5
0.1
V
OUT
= +3.0V
0
V
OUT
= +1.5V
-0.1
V
OUT
= +0.75V
-0.2
0
50
100
150
200
250
300
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)
_______________________________________________________________________________________
3
Low-Input-Voltage, 300mA LDO Regulators
with
RESET
in SOT and TDFN
MAX1963A/MAX1976A
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.)
GROUND-PIN CURRENT
vs. LOAD CURRENT
MAX1963/76 toc04
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
MAX1963/76 toc05
GROUND-PIN CURRENT
vs. TEMPERATURE
MAX1963/76 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
80
60
40
20
V
OUT
= 1.5V
0
I
OUT
= 100mA
I
OUT
= 300mA
120
110
GROUND-PIN CURRENT (µA)
I
OUT
= 100mA
100
90
80
70
60
50
I
OUT
= 300mA
I
OUT
= 0mA
GROUND-PIN CURRENT (µA)
GROUND-PIN CURRENT (µA)
I
OUT
= 0mA
1000
1.2
1.6
2.0
2.4
2.8
3.2
3.6
-40
-20
0
20
40
60
80
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX1963/76 toc07
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
V
OUT
= +0.75V
70
60
PSRR (dB)
50
40
30
20
V
OUT
= +1.5V
V
OUT
= +3.0V
MAX1963/76 toc08
120
100
V
DROPOUT
(mV)
80
60
V
OUT
= +3.0V
40
20
0
0
50
100
150
200
250
V
OUT
= +1.8V
80
10
0
300
I
OUT
= 10mA
0.1
1
10
FREQUENCY (kHz)
100
1000
LOAD CURRENT (mA)
LINE-TRANSIENT RESPONSE
MAX1963/76 toc09
LINE-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1963/76 toc10
V
IN
3.5V
500mV/div
V
IN
1.8V
500mV/div
V
OUT
1.5V
10mV/div
AC-COUPLED
40µs/div
V
OUT
1.5V
10mV/div
AC-COUPLED
40µs/div
4
_______________________________________________________________________________________
Low-Input-Voltage, 300mA LDO Regulators
with
RESET
in SOT and TDFN
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.)
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX1963/76 toc12
MAX1963A/MAX1976A
LOAD-TRANSIENT RESPONSE
MAX1963/76 toc11
200mA
I
OUT
20mA
200mA/div
200mA
I
OUT
20mA
200mA/div
V
OUT
20mV/div
AC-COUPLED
V
OUT
20mV/div
AC-COUPLED
V
IN
= 3.6V
V
OUT
= 1.5V
20µs/div
V
IN
= 1.8V
V
OUT
= 1.5V
20µs/div
SHUTDOWN RESPONSE
MAX1963/76 toc13
MAX1976A
SHUTDOWN/RESET RESPONSE
MAX1963/76 toc14
V
SHDN
0
1V/div
V
SHDN
0
V
OUT
1V/div
V
OUT
0
500mV/div
V
RESET
0
1V/div
0
1V/div
100µs/div
40ms/div
MAX1976A
LINE/RESET RESPONSE
MAX1963/76 toc15
V
IN
0
V
OUT
0
V
RESET
0
2V/div
1V/div
1V/div
200ms/div
_______________________________________________________________________________________
5
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