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MAX8557ETE+T

P1-P3P4-P6P7-P9P10-P10
General Description
The MAX8556/MAX8557 low-dropout linear regulators
operate from input voltages as low as 1.425V and are
able to deliver up to 4A of continuous output current
with a typical dropout voltage of only 100mV. The out-
put voltage is adjustable from 0.5V to V
IN
- 0.2V.
Designed with an internal p-channel MOSFET pass tran-
sistor, the MAX8556/MAX8557 maintain a low 800µA typi-
cal supply current, independent of the load current and
dropout voltage. Using a p-channel MOSFET eliminates
the need for an additional external supply or a noisy inter-
nal charge pump. Other features include a logic-con-
trolled shutdown mode, built-in soft-start, short-circuit
protection with foldback current limit, and thermal-over-
load protection. The MAX8556 features a POK output that
transitions high when the regulator output is within ±10%
of its nominal output voltage. The MAX8557 offers a
power-on reset output that transitions high 140ms after the
output has achieved 90% of its nominal output voltage.
The MAX8556/MAX8557 are available in a 16-pin thin
QFN 5mm x 5mm package with exposed paddle.
Applications
Servers and Storage Devices
Networking
Base Stations
Optical Modules
Point-of-Load Supplies
ATE
Features
o 1.425V to 3.6V Input Voltage Range
o Guaranteed 4A Output Current
o ±1% Output Accuracy Over Load/Line/
Temperature
o 100mV Dropout at 4A Load (typ)
o Built-In Soft-Start
o 800µA (typ) Operating Supply Current
o 150µA (max) Shutdown Supply Current
o Short-Circuit Current Foldback Protection
o Thermal-Overload Protection
o ±10% Power-OK (MAX8556)
o 140ms Power-On Reset Output (MAX8557)
o Fast Transient Response
o 16-Pin Thin QFN (5mm x 5mm) Package
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
________________________________________________________________
Maxim Integrated Products
1
12 11 10 9
5
6
7
EP
8
IN
IN
OUT
OUT
TOP VIEW
16
15
14
13
EN
+
N.C.
GND
FB
1234
IN
IN
IN
IN
MAX8556
(MAX8557)
POK (POR)
OUT
OUT
OUT
THIN QFN
5mm x 5mm
Pin Configuration
Ordering Information
IN
EN
GND
OUT
FB
N.C.
POK
(POR)
V
IN
1.425V TO 3.6V
V
OUT
0.5V TO V
IN
- 0.2V
MAX8556
(MAX8557)
Typical Operating Circuit
19-3257; Rev 2; 8/09
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
FEATURE
MAX8556ETE+ - 40°C to + 85°C 16 Thin QFN-EP* POK
M AX 8556E TE /V + - 40°C to + 85°C 16 Thin QFN-EP* POK
MAX8557ETE+ - 40°C to + 85°C 16 Thin QFN-EP* POR
+
Denotes a lead(Pb)-free/RoHS-compliant package.
/V Denotes an automotive qualified part.
*EP = Exposed pad.
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
EN
= V
IN
= 1.8V, V
OUT
= 1.5V, I
OUT
= 2mA, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
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, POR to GND .......................................-0.3V to +4V
FB, OUT to GND ..........................................-0.3V to (V
IN
+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
16-Pin Thin QFN (derate 33.3mW/°C
above +70°C) (Note 1)............................................2666.7mW
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 MIN TYP MAX UNITS
IN
Input Voltage Range 1.425 3.600 V
V
IN
rising, 70mV hysteresis 1.30 1.35 1.40
Input Undervoltage Lockout
V
IN
falling 1.23 1.28 1.33
V
OUT
Output Voltage Range 0.5 3.4 V
Load Regulation I
OUT
= 2mA to 4A 0.1 %/A
Line Regulation V
IN
= 1.425V to 3.6V, V
OUT
= 1.225V -0.15 0 +0.15 %/V
Dropout Voltage V
IN
= 1.425V, I
OUT
= 4A, V
FB
= 480mV 100 200 mV
Regulated Output-Voltage Current
Limit
V
IN
= 3.6V, V
OUT
= 3V, V
FB
= 460mV 5 7 9 A
Load Capacitance ESR < 50mA 16 120 µF
FB
FB Threshold Accuracy
(Note 3)
V
OUT
= 1.225V to 3V, V
IN
= V
OUT
+ 0.2V to 3.6V,
I
OUT
= 2mA to 4A
495 500 505 mV
FB Input Bias Current V
FB
= 0.5V, V
IN
= 3.6V 0.001 1 µA
GND
V
IN
= 1.425V to 3.6V, V
OUT
= 1.225V 800 1600
GND Supply Current
Dropout, V
IN
= 3.6V, V
FB
= 480mV 1000 2000
µA
GND Shutdown Current V
IN
= 3.6V, EN = GND 150 µA
POK
FB high 540 550 560
FB Power-OK Fault Threshold
FB moving out of regulation,
V
IN
= 1.425V to 3.6V, 10mV hysteresis
FB low 440 450 460
mV
POK Output Voltage, Low V
FB
= 0.4V or 0.6V, I
POK
= 2mA 25 200 mV
Note 1: Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 standards.
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
_______________________________________________________________________________________ 3
Note 2: Specifications to T
A
= -40°C are guaranteed by design and not production tested.
Note 3: Minimum supply voltage for output accuracy must be at least 1.425V.
ELECTRICAL CHARACTERISTICS (continued)
(V
EN
= V
IN
= 1.8V, V
OUT
= 1.5V, I
OUT
= 2mA, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
POK Output Current, High V
POK
= 3.6V V
FB
= 0.5 0.001 1 µA
POK Delay Time From FB rising to POK high 25 50 100 µs
EN
EN rising 1.25
Enable Input Threshold V
IN
= 1.425V to 3.6V
EN falling 0.4
V
Enable Input Bias Current V
EN
= 0V or 3.6V -1 +1 µA
THERMAL SHUTDOWN
T
J
rising +160
Thermal-Shutdown Threshold Output on and off
T
J
falling +115
°C
POR
FB Power-On Reset Fault Threshold FB falling, V
IN
= 1.425V to 3.6V, 10mV hysteresis 440 450 460 mV
POR Output Voltage, Low V
FB
= 0.4V, I
POR
= 2mA 25 200 mV
POR Output Current, High V
POR
= 3.6V, V
FB
= 0.5V 0.001 1 µA
POR Rising Delay Time FB rising to POR high impedance 100 140 200 ms
SOFT-START
Soft-Start Time 100 µs
Typical Operating Characteristics
(V
EN
= V
IN
= +1.8V, V
OUT
= +1.5V, I
OUT
= 4A, C
OUT
= 20µF, C
IN
= 20µF, and T
A
= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8556 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
3.02.41.8
1.35
1.40
1.45
1.50
1.55
1.30
1.2 3.6
T
A
= -25
°
C
T
A
= -40
°
C
T
A
= -85
°
C
I
LOAD
= 2A
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8556 toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
321
1.4980
1.4985
1.4990
1.4995
1.5000
1.5005
1.5010
1.5015
1.5020
1.5025
1.4975
04
T
A
= -40
°
C
T
A
= +85
°
C
T
A
= +25
°
C
GND CURRENT vs. INPUT VOLTAGE
MAX8556 toc03
INPUT VOLTAGE (V)
GND CURRENT (µA)
2.41.2
100
200
300
400
500
600
700
800
900
1000
0
0 3.6
I
LOAD
= 4A
I
LOAD
= 2A
I
LOAD
= 0A
P1-P3P4-P6P7-P9P10-P10

MAX8557ETE+T

Mfr. #:
Buy MAX8557ETE+T
Manufacturer:
Maxim Integrated
Description:
LDO Voltage Regulators 4A Ultra-Low-Input-V LDO Regulator
Lifecycle:
New from this manufacturer.
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