19-3190; Rev 2; 8/09
KIT
ATION
EVALU
BLE
AVAILA
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
General Description
Features
o
1.425V to 3.6V Input Voltage Range
o
Guaranteed 200mV Dropout at 2A Output Current
o
±0.6% Initial Accuracy
o
±1.4% Output Accuracy over
Load/Line/Temperature (0°C to +85°C)
o
Compatible with Ceramic Capacitors
o
Fast Transient Response
o
440µA Operating Supply Current
o
<50µA Shutdown Supply Current
o
Short-Circuit Protection
o
Thermal-Overload Protection
o
Soft-Start Limits Inrush Current
o
5mm x 6.4mm Footprint, 1.1mm Profile
MAX8526/MAX8527/MAX8528
The MAX8526/MAX8527/MAX8528 low-dropout linear
regulators operate from input voltages as low as 1.425V
and are able to deliver up to 2A of continuous output
current with a maximum dropout voltage of only 200mV.
The output voltage can be set from 0.5V to (V
IN
- 0.2V)
and is 1.4% accurate over load and line variations, from
0°C to +85°C.
These regulators use small, 2.2µF ceramic input capaci-
tors and 10µF ceramic output capacitors to deliver 2A
output current. High bandwidth provides excellent tran-
sient response and limits the output voltage deviation to
45mV for a 20mA to 2A load step, with only a 10µF
ceramic output capacitor, and the voltage deviations can
be reduced further by increasing the output capacitor.
Designed with an internal p-channel MOSFET pass
transistor, the MAX8526/MAX8527/MAX8528 feature
low 500µA typical supply current during dropout condi-
tions. Soft-start reduces inrush current. Other features
include a logic-controlled shutdown mode, short-circuit
protection, and thermal-overload protection.
The MAX8527 features a power-OK (POK) output that
transitions high when the regulator output is within
±10% of its nominal output voltage. The MAX8528 fea-
tures a 150ms power-on reset (POR) output.
The parts are packaged in a 14-pin TSSOP package,
which includes an exposed pad for optimal power
dissipation.
Ordering Information
PART
MAX8526EUD
MAX8526EUD+
MAX8527EUD
MAX8527EUD+
MAX8527EUD/V+
MAX8528EUD
MAX8528EUD+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 TSSOP
14 TSSOP
14 TSSOP
14 TSSOP
14 TSSOP
14 TSSOP
14 TSSOP
Applications
Servers
Networking
Storage
Base Stations
Optical Modules
Post Regulators
Notebooks
PDAs
ATE
+Denotes
a lead(Pb)-free RoHS-compliant package.
/V Denotes an automotive qualified part.
Typical Operating Circuit
INPUT
1.425V TO 3.6V
IN_
2.2µF
OUT_
OUTPUT
0.5V TO (V
IN
- 0.2V), 2A
MAX8526
MAX8527
MAX8528
POWER-ON RESET
POR (MAX8528)
POWER-OK
ON
POK (MAX8527)
EN
OFF
GND
FB
10µF
Pin Configurations appear at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
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.
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
MAX8526/MAX8527/MAX8528
ABSOLUTE MAXIMUM RATINGS
IN, EN, POK (MAX8527), POR (MAX8528),
FB to GND ........................................................-0.3V to +4.0V
OUT to GND ..................................................-0.3V to (IN + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70°C,
EP soldered to PC board ground)
14-Pin TSSOP (derate 20.8mW/°C above +70°C)..............1.7W
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
(Circuit of Figure 1: V
IN
= +1.8V, V
OUT
= +1.5V, EN = IN, I
OUT
= 2mA, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
IN
Input Voltage Range
Input Undervoltage Lockout
OUT
Output Voltage Range
Load Regulation
Line Regulation
Dropout Voltage (V
IN
- V
OUT
)
Current Limit
Output Shutdown Leakage
FB
I
OUT
= 20mA, T
A
= +85°C
FB Threshold Accuracy
FB Input Bias Current
V
OUT
= 1.225V to 3V, V
IN
= (V
OUT
+ 0.2V) to 3.6V,
I
OUT
= 2mA to 2A
V
FB
= 0.5V, V
IN
= 3.6V
497
493
0.001
500
503
507
1
mV
µA
I
OUT
= 2mA to 2A
V
IN
= 1.425V to 3.6V, V
OUT
= 1.225V, I
OUT
= 2mA
V
IN
= 1.425V, I
OUT
= 2A, V
FB
= 480mV
V
IN
= 3.6V, V
OUT
= 3V, V
FB
= 480mV
V
IN
= 3.6V, V
OUT
= 0V, V
EN
= 0V
3.2
-0.15
0.5
0.08
0
100
4
0.5
+0.15
200
4.8
50
3.4
V
%/A
%/V
mV
A
µA
V
IN
rising, 70mV hysteresis
1.425
1.32
1.35
3.600
1.38
V
V
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1: V
IN
= +1.8V, V
OUT
= +1.5V, EN = IN, I
OUT
= 2mA, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
GND
GND Supply Current
GND Shutdown Current
POK (MAX8527 Only)
Power-OK Threshold
POK Output Voltage Low
POK Output Current High
POK Fault Delay Time
POR (MAX8528 Only)
Power-On Reset Threshold
POR Output Voltage Low
POR Output Current High
POR Rising Delay Time
EN
Enable Input Threshold
Enable Input Bias Current
THERMAL SHUTDOWN
Thermal-Shutdown Threshold
OUTPUT TRANSIENT
Load Transient
Line Transient
I
OUT
= 20mA to 2A to 20mA, t
RISE
= t
FALL
= 1µs
δV
IN
= 0.5V, t
RISE
= t
FALL
= 5µs
3
3
%
%
Output on or off
T
J
rising
T
J
falling
+165
+150
°C
V
IN
= 1.425V to 3.6V
V
EN
= 0 or 3.6V
EN rising
EN falling
0.4
-1
+1
1.2
V
µA
V
FB
falling, V
HYS
= 10mV, V
IN
= 1.425V to 3.6V
V
FB
= 0.4V or 0.6V, I
POR
= 2mA
V
POR
= 3.6V
From FB to POR
105
440
450
25
0.001
150
460
200
1
210
mV
mV
µA
ms
V
FB
moving out of regulation,
V
HYS
= 10mV, IN = 1.425V to 3.6V
V
FB
= 0.4V or 0.6V, I
POK
= 2mA
V
POK
= 3.6V
From FB to POK
25
FB high
FB low
540
440
550
450
25
0.001
50
560
460
200
1
100
mV
mV
µA
µs
V
IN
= 3.6V, V
OUT
= 3V, I
OUT
= 20mA
Dropout, V
IN
= 3.6V, V
FB
= 480mV
V
IN
= 3.6V, EN = GND
440
500
0.5
800
50
µA
µA
CONDITIONS
MIN
TYP
MAX
UNITS
MAX8526/MAX8527/MAX8528
Note 1:
Specifications to T
A
= -40°C are guaranteed by design, not production tested.
Note 2:
Measurements at high current are pulse tested, such that the junction temperature is ambient temperature. Minimum supply
voltage for output accuracy must be at least 1.425V.
_______________________________________________________________________________________
3
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
MAX8526/MAX8527/MAX8528
Typical Operating Characteristics
(Typical values are: V
IN
= +1.8V, V
OUT
= +1.5V, I
OUT
= 2A, C
OUT
=10µF, C
IN
= 2.2µF, and T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
T
A
= -40°C TO +85°C
MAX8526/27/28 toc01
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX8526/27/28 toc02
GROUND CURRENT
vs. INPUT VOLTAGE
I
LOAD
= 2A
600
GROUND CURRENT (µA)
500
400
300
200
100
0
I
LOAD
= 0A
I
LOAD
= 1A
MAX8526/27/28 toc03
1.60
1.55
OUTPUT VOTAGE (V)
1.50
1.45
1.40
1.35
1.30
0
0.6
1.2
1.8
1.500
1.499
1.498
OUTPUT VOLTAGE (V)
1.497
1.496
1.495
1.494
1.493
1.492
1.491
1.490
T
A
= +25°C
T
A
= -40°C
T
A
= +85°C
700
2.4
3.0
3.6
0
400
800
1200
1600
2000
2400
0
0.6
1.2
1.8
2.4
3.0
3.6
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
INPUT VOLTAGE (V)
GROUND CURRENT
vs. LOAD CURRENT
MAX8526/27/28 toc04
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8526/27/28 toc05
LINE-TRANSIENT RESPONSE
(V
IN
= 1.8V TO 2.5V, I
OUT
= 2A)
650
600
GROUND CURRENT (µA)
550
T
A
= +85°C
500
450
400
350
300
250
0
400
800
1200
1600
2000
T
A
= +25°C
T
A
= -40°C
125
MAX8526/27/28 toc06
DROPOUT VOLTAGE (mV)
100
75
V
OUT
10mV/div
AC-COUPLED
50
25
V
IN
500mV/div
AC-COUPLED
0
2400
0
400
800
1200
1600
2000
100µs/div
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD-TRANSIENT RESPONSE
(I
LOAD
= 0.2A TO 2.2A; C
IN
= 220µF
ELECTROLYTIC CAP CLOSE TO IN)
MAX8526/27/28 toc07
SHUTDOWN RESPONSE
MAX8526/27/28 toc08
V
OUT
50mV/div
AC-COUPLED
2.2A
V
OUT
1V/div
I
IN
2A/div
0.2A
I
LOAD
1A/div
EN
2V/div
100µs/div
40µs/div
4
_______________________________________________________________________________________
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
Typical Operating Characteristics (continued)
(Typical values are: V
IN
= +1.8V, V
OUT
= +1.5V, I
OUT
= 2A, C
OUT
=10µF, C
IN
= 2.2µF, and T
A
= +25°C, unless otherwise noted.)
FB VOLTAGE vs. TEMPERATURE
MAX8526/27/28 toc09
MAX8526/MAX8527/MAX8528
PSRR vs. FREQUENCY (MAX8526)
80
70
60
50
PSRR (dB)
40
30
20
10
0
-10
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
I
LOAD
= 100mA
502
501
500
FB VOLTAGE (mV)
499
498
497
496
495
494
-40
I
LOAD
= 20mA
-15
10
35
60
85
TEMPERATURE (°C)
OUTPUT RIPPLE VOLTAGE
MAX8526/27/28 toc11
OVERCURRENT THRESHOLD
vs. TEMPERATURE
MAX8526/27/28 toc12
4.0
OVERCURRENT THRESHOLD (A)
3.9
V
OUT
1mV/div
AC-COUPLED
3.8
3.7
3.6
3.5
10µs/div
-40
-15
10
35
60
85
TEMPERATURE (°C)
SHORT-CIRCUIT CURRENT
MAX8526/27/28 TOC13
CASE TEMPERATURE
vs. LOAD CURRENT
MAX8526/27/28 toc14
75
CASE TEMPERATURE (°C)
V
OUT
1V/div
60
45
30
I
OUT
2A/div
15
V
IN
= 2.5V; T
A
= +25°C
0
40µs/div
0
400
800
1200
1600
2000
LOAD CURRENT (mA)
_______________________________________________________________________________________
MAX8526/27/28 toc10
5
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