MAXIM MAX8526, MAX8527, MAX8528 User Manual
General Description
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 (VIN- 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 capacitors and 10µF ceramic output capacitors to deliver 2A
output current. High bandwidth provides excellent transient 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 conditions. 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 features 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.
Applications
Servers
Networking
Storage
Base Stations
Optical Modules
Post Regulators
Notebooks
PDAs
ATE
Features
♦ 1.425V to 3.6V Input Voltage Range
♦ Guaranteed 200mV Dropout at 2A Output Current
♦ ±0.6% Initial Accuracy
♦ ±1.4% Output Accuracy over
Load/Line/Temperature (0°C to +85°C)
♦ Compatible with Ceramic Capacitors
♦ Fast Transient Response
♦ 440µA Operating Supply Current
♦ <50µA Shutdown Supply Current
♦ Short-Circuit Protection
♦ Thermal-Overload Protection
♦ Soft-Start Limits Inrush Current
♦ 5mm x 6.4mm Footprint, 1.1mm Profile
MAX8526/MAX8527/MAX8528
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
________________________________________________________________ Maxim Integrated Products 1
MAX8526
MAX8527
MAX8528
2.2μF
10μF
INPUT
1.425V TO 3.6V
OUTPUT
0.5V TO (V
IN
- 0.2V), 2A
POWER-ON RESET
POWER-OK
ON
OFF
IN_
POR (MAX8528)
POK (MAX8527)
EN GND
FB
OUT_
Typical Operating Circuit
Ordering Information
19-3190; Rev 1; 5/05
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.
Pin Configurations appear at end of data sheet.
+Denotes lead-free packaging.
PART TEMP RANGE PIN-PACKAGE
MAX8526EUD -40°C to +85°C 14 TSSOP
MAX8526EUD+ -40°C to +85°C 14 TSSOP
MAX8527EUD -40°C to +85°C 14 TSSOP
MAX8527EUD+ -40°C to +85°C 14 TSSOP
MAX8528EUD -40°C to +85°C 14 TSSOP
MAX8528EUD+ -40°C to +85°C 14 TSSOP
MAX8526/MAX8527/MAX8528
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1: VIN= +1.8V, V
OUT
= +1.5V, EN = IN, I
OUT
= 2mA, TA = -40°C to +85°C, unless otherwise noted.) (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, 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
PARAMETER CONDITIONS
UNITS
IN
Input Voltage Range
V
Input Undervoltage Lockout VIN rising, 70mV hysteresis
V
OUT
Output Voltage Range 0.5 3.4 V
Load Regulation I
OUT
= 2mA to 2A
%/A
Line Regulation VIN = 1.425V to 3.6V, V
OUT
= 1.225V, I
OUT
= 2mA
0
% / V
Dropout Voltage (VIN - V
OUT
)VIN = 1.425V, I
OUT
= 2A, VFB = 480mV
mV
Current Limit VIN = 3.6V, V
OUT
= 3V, V
FB
= 480mV 3.2 4 4.8 A
Output Shutdown Leakage VIN = 3.6V, V
OUT
= 0, VEN = 0 0.5 50 µA
FB
I
OUT
= 20mA, TA = +85°C 497
FB Threshold Accuracy
V
OUT
= 1.225V to 3V, VIN = (V
OUT
+ 0.2V) to 3.6V,
I
OUT
= 2mA to 2A
493
mV
FB Input Bias Current VFB = 0.5V, VIN = 3.6V
1µA
MIN TYP MAX
1.425 3.600
1.32 1.35 1.38
0.08
-0.15
100 200
500 503
0.001
+0.15
507
MAX8526/MAX8527/MAX8528
1.425V to 3.6V Input, 2A,
0.2V Dropout LDO Regulators
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1: VIN= +1.8V, V
OUT
= +1.5V, EN = IN, I
OUT
= 2mA, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
Note 1: Specifications to -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.
PARAMETER CONDITIONS
MIN
TYP
MAX
UNITS
GND
VIN = 3.6V, V
OUT
= 3V, I
OUT
= 20mA
GND Supply Current
Dropout, V
IN
= 3.6V, VFB = 480mV
µA
GND Shutdown Current VIN = 3.6V, EN = GND 0.5 50 µA
POK (MAX8527 only)
FB high
Power-OK Threshold
V
FB
moving out of regulation,
V
HYS
= 10mV, IN = 1.425V to 3.6V
FB low
mV
POK Output Voltage Low V
FB
= 0.4V or 0.6V, I
POK
= 2mA 25
mV
POK Output Current High V
POK
= 3.6V
1µA
POK Fault Delay Time From FB to POK 25 50
µs
POR (MAX8528 only)
Power-On Reset Threshold VFB falling, V
HYS
= 10mV, VIN = 1.425V to 3.6V
mV
POR Output Voltage Low V
FB
= 0.4V or 0.6V, I
POR
= 2mA 25
mV
POR Output Current High V
POR
= 3.6V
1µA
POR Rising Delay Time From FB to POR
ms
EN
EN rising 1.2
Enable Input Threshold VIN = 1.425V to 3.6V
EN falling 0.4
V
Enable Input Bias Current VEN = 0 or 3.6V -1 +1 µA
THERMAL SHUTDOWN
TJ rising
Thermal-Shutdown Threshold Output on or off
T
J
falling
°C
OUTPUT TRANSIENT
Load Transient I
OUT
= 20mA to 2A to 20mA, t
RISE
= t
FALL
= 1µs 3 %
Line Transient δV
IN
= 0.5V, t
RISE
= t
FALL
= 5µs 3 %
440
500 800
540 550 560
440 450 460
200
0.001
100
440 450 460
200
0.001
105 150 210
+165
+150
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