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MAX1982EUT+T

P1-P3P4-P6P7-P9P10-P12P13-P13
General Description
The MAX1982/MAX1983 are low-voltage, low-dropout
linear regulators with an external bias supply input. The
5V bias supply drives the gate of the internal N-channel
pass transistor, making these devices ideal for applica-
tions that require low-voltage outputs from low-voltage
inputs. The MAX1982 delivers 1.2V (±3%) at 300mA
from an input voltage of 1.25V to 5.5V. The MAX1983
delivers an adjustable output voltage from 0.8V to 2V.
The MAX1982/MAX1983 include a current-limit and
thermal shutdown that protects the regulator in the
event of a fault condition. Both devices are offered in a
6-pin SOT23 package and are specified over the
extended (-40°C to +85°C) temperature range.
Applications
Notebook Computers
VID Power Supplies
PDAs
Cell Phones
Low-Dropout Regulators with External Bias
Supply
Features
o Low-Cost 1.2V, 300mA VID Supply
o ±3% Output Voltage Accuracy
o No Minimum Load Current Required
o 1.25V to 5.5V Input Supply Voltage
o 5V Input Bias Supply Voltage
o Power-Good (PGOOD) Open-Drain Output with
1ms Rising Edge Propagation Delay (MAX1982)
o Adjustable Output Voltage (MAX1983)
o Low Supply Current (I
BIAS
+ I
IN
= 165µA typ)
o 5µA (max) Shutdown Supply Current
o Tiny 6-Pin SOT23 Package
MAX1982/MAX1983
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
________________________________________________________________
Maxim Integrated Products
1
GND
PGOODSHDN
16IN
5 OUT
BIAS
MAX1982
SOT23
Fixed Output Voltage
TOP VIEW
2
34
GND
ADJSHDN
16IN
5 OUT
BIAS
MAX1983
SOT23
Adjustable Output
2
34
Pin Configurations
Ordering Information
0.1μF
BIAS
GND
SHDN
ON
OFF
IN
OUT
PGOOD
PGOOD
100kΩ
10μF
10μF
4.5V TO 5.5V
1.25V TO 5.5V
1.2V
MAX1982
Typical Operating Circuit
19-2560; Rev 1; 10/08
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE
TOP
MARK
MAX1982EUT-T -40°C to +85°C 6 SOT23-6 ABEA
MAX1983EUT-T -40°C to +85°C 6 SOT23-6 ABEB
MAX1982EUT+T -40°C to +85°C 6 SOT23-6 ABEA+
MAX1983EUT+T -40°C to +85°C 6 SOT23-6 ABEB+
+
Denotes lead(Pb)-free package/RoHS-compliant package.
MAX1982/MAX1983
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V
IN
= 1.8V, I
LOAD
= 1mA, C
LOAD
= 10µF, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +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.
ADJ, IN, BIAS, PGOOD, SHDN, OUT to GND..........-0.3V to +6V
Output Short-Circuit Duration ............................................Infinite
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/
o
C above +70°C)............696mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65
o
C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
SYM B O L
CONDITIONS
MIN
TYP
UNITS
Input Voltage V
IN
1.25
5.5 V
BIAS Voltage V
BIAS
4.5 5.5 V
V
OUT
Voltage Range V
OUT
MAX1983 0.8 2.0 V
BIAS Input Undervoltage Lockout
3.8 4.1
4.35
V
Shutdown Supply Current I
IN
1.25V < V
IN
< 5.5V 1 5 µA
Quiescent BIAS Current I
Q
4.5V < V
BIAS
< 5.5V
140
250 µA
Shutdown BIAS Current I
SHDN
4.5V < V
BIAS
< 5.5V 1 5 µA
MAX1982: V
IN
= open, V
OUT
= 1.20V
30
V
OUT
Input Bias Current
MAX1983: V
IN
= open, 0.8V < V
OUT
< 2.0V
2
µA
MAX1983 ADJ Input Current
0V < V
ADJ
< 2.0V
1µA
REGULATOR CHARACTERISTICS
Line Regulation
ΔV
OUT
/
ΔV
IN
I
LOAD
= 10mA, 1.5V < V
IN
< 5.5V
-0.15 +0.15
%/V
T
A
= +25°C, I
OUT
= 100mA -1 +1
MAX1982 1.20V
Output Voltage Accuracy
V
OUT
T
A
= 0°C to +85°C, I
OUT
= 1mA to 300mA,
V
OUT
+ 0.5V < V
IN
< 5.5V
-3 +3
%
T
A
= +25°C, I
OUT
= 100mA -1 +1
MAX1983 0.80V
Output Voltage Accuracy
V
OUT
T
A
= 0°C to +85°C, I
OUT
= 1mA to 300mA,
V
OUT
+ 0.5V < V
IN
< 5.5V
-3 +3
%
I
LOAD
= 300mA 350
Dropout Voltage V
DO
I
LOAD
= 150mA 175
mV
Current Limit I
LIM
V
IN
- V
OUT
= 1.3V
330 600 1400
mA
Thermal-Shutdown Temperature
T
SHDN
160
°C
Thermal-Shutdown Hysteresis 20 °C
RMS Output Noise 10Hz to 100kHz 65
µV
RMS
PGOOD COMPARATOR
Comparator Threshold % of regulated output voltage
-12.5
-9 -6 %
Comparator Hysteresis V
HYST
10 mV
MAX1982/MAX1983
Low-Voltage, Low-Dropout Linear Regulators
with External Bias Supply
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V
IN
= 1.8V, I
LOAD
= 1mA, C
LOAD
= 10µF, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.) (Note 1)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V
IN
= 1.8V, I
LOAD
= 1mA, C
LOAD
= 10µF, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
SYM B O L
CONDITIONS
MIN TYP MAX UNITS
LOGIC AND I/O
SHDN Input High Voltage V
IH
2.4 V
SHDN Input Low Voltage V
IL
0.8 V
SHDN Input Current -1 +1 µA
PGOOD Output Low Voltage PGOOD sinking 1mA 0.1 V
PGOOD Output
High Leakage Current
0 < V
PGOOD
< V
IN
-1 +1 µA
DYNAMICS
Positive Load Step t
RISE
I
LOAD
= 1mA to full load, C
LOAD
= 10µF 10 µs
Negative Load Step t
FALL
I
LOAD
= full load to 1mA, C
LOAD
= 10µF 50 µs
Ripple Rejection at V
IN
10Hz < f < 10kHz, I
LOAD
= 300mA,
C
LOAD
= 10µF
-60 dB
Startup Response Time t
ON
I
LOAD
= 300mA, C
LOAD
= 10µF, 0% to 90%
of nominal output voltage
100
µs
Startup Overshoot I
LOAD
= 300mA, C
LOAD
= 10µF 0.5 %
Falling edge, 3mV under trip threshold 10 µs
PGOOD Propagation Delay t
PD
Rising edge within 5% of regulation level 1 4 ms
PARAMETER
SYM B O L
CONDITIONS
MIN MAX
UNITS
Input Voltage V
IN
1.25
5.5 V
BIAS Voltage V
BIAS
4.5 5.5 V
V
OUT
Voltage Range V
OUT
MAX1983 0.8 2.0 V
BIAS Input Undervoltage Lockout
3.8 4.2 V
Shutdown Supply Current I
IN
1.25V < V
IN
< 5.5V 5 µA
Quiescent BIAS Current I
Q
4.5V < V
BIAS
< 5.5V 250 µA
Shutdown BIAS Current I
SHDN
4.5V < V
BIAS
< 5.5V 5 µA
MAX1982: V
IN
= open, V
OUT
= 1.20V
30
V
OUT
Input Bias Current
MAX1983: V
IN
= open, 0.8V < V
OUT
< 2.0V
2
µA
REGULATOR CHARACTERISTICS
Line Regulation
ΔV
OUT
/
ΔV
IN
I
LOAD
= 10mA, 1.5V < V
IN
< 5.5V
-0.15 +0.15
%/V
MAX1982 1.20V
Output Voltage Accuracy
V
OUT
I
OUT
= 1mA to 300mA,
V
OUT
+ 0.5V < V
IN
< 5.5V
-3 +3 %
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX1982EUT+T

Mfr. #:
Buy MAX1982EUT+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators Low-Voltage w/ External Bias Supply
Lifecycle:
New from this manufacturer.
Delivery:
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