MAX8556ETE+-MAX8556ETE+T-MAX8557ETE+-MAX8557ETE+T-MAX8557ETE-T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8556ETE+ ,4A Ultra-Low-Input-Voltage LDO RegulatorsMAX8556/MAX855719-3257; Rev 2; 8/094A Ultra-Low-Input-VoltageLDO Regulators
MAX8556ETE+ ,4A Ultra-Low-Input-Voltage LDO RegulatorsELECTRICAL CHARACTERISTICS(V = V = 1.8V, V = 1.5V, I = 2mA, T = -40°C to +85°C, typical values are ..
MAX8556ETE+T ,4A Ultra-Low-Input-Voltage LDO RegulatorsFeaturesThe MAX8556/MAX8557 low-dropout linear regulators ♦ 1.425V to 3.6V Input Voltage Rangeopera ..
MAX8557ETE ,PLASTIC ENCAPSULATED DEVICESTable of Contents I. ........Device Description V. ........Quality Assurance Information II ..
MAX8557ETE+ ,4A Ultra-Low-Input-Voltage LDO Regulatorsfeatures a POK output thattransitions high when the regulator output is within ±10% ♦ 140ms Power-O ..
MAX8557ETE+ ,4A Ultra-Low-Input-Voltage LDO Regulatorsfeatures include a logic-con- ♦ Short-Circuit Current Foldback Protectiontrolled shutdown mode, bui ..
MB82D01171A-80LLPBN , 16 Mbit (1 M word x 16 bit) Mobile Phone Application Specific Memory
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MAX8556ETE+-MAX8556ETE+T-MAX8557ETE+-MAX8557ETE+T-MAX8557ETE-T
4A Ultra-Low-Input-Voltage LDO Regulators
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 VIN - 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
Features1.425V to 3.6V Input Voltage RangeGuaranteed 4A Output Current±1% Output Accuracy Over Load/Line/
Temperature100mV Dropout at 4A Load (typ)Built-In Soft-Start800µA (typ) Operating Supply Current150µA (max) Shutdown Supply CurrentShort-Circuit Current Foldback ProtectionThermal-Overload Protection±10% Power-OK (MAX8556)140ms Power-On Reset Output (MAX8557)Fast Transient Response16-Pin Thin QFN (5mm x 5mm) Package
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators11109
OUT
OUT
TOP VIEW
N.C.
GND34INININ
MAX8556
(MAX8557)
POK (POR)OUTOUTOUT
THIN QFN
5mm x 5mm
Pin Configuration
Ordering Information
GND
OUT
N.C.
POK
(POR)
VIN
1.425V TO 3.6V
VOUT
0.5V TO VIN - 0.2V
MAX8556
(MAX8557)
Typical Operating Circuit
19-3257; Rev 2; 8/09
EVALUATION KIT
AVAILABLE
PARTTEMP
RANGE
PIN-
PACKAGEFEATURE
MAX8556ETE+- 40°C to + 85°C 16 Thin QFN-EP*POKAX 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
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VEN = VIN = 1.8V, VOUT = 1.5V, IOUT = 2mA, TA = -40°C to +85°C, typical values are at TA = +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 (VIN+ 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +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
PARAMETERCONDITIONSMINTYPMAXUNITS
Input Voltage Range1.4253.600V
VIN rising, 70mV hysteresis1.301.351.40Input Undervoltage LockoutVIN falling1.231.281.33V
OUT
Output Voltage Range0.53.4V
Load RegulationIOUT = 2mA to 4A0.1%/A
Line RegulationVIN = 1.425V to 3.6V, VOUT = 1.225V-0.150+0.15%/V
Dropout VoltageVIN = 1.425V, IOUT = 4A, VFB = 480mV100200mV
Regulated Output-Voltage Current
LimitVIN = 3.6V, VOUT = 3V, VFB = 460mV579A
Load CapacitanceESR < 50mA16120µF
FB Threshold Accuracy
(Note 3)
VOUT = 1.225V to 3V, VIN = VOUT + 0.2V to 3.6V,
IOUT = 2mA to 4A495500505mV
FB Input Bias CurrentVFB = 0.5V, VIN = 3.6V0.0011µA
GND
VIN = 1.425V to 3.6V, VOUT = 1.225V8001600GND Supply CurrentDropout, VIN = 3.6V, VFB = 480mV10002000µA
GND Shutdown CurrentVIN = 3.6V, EN = GND150µA
POK
FB high540550560FB Power-OK Fault ThresholdFB moving out of regulation,
VIN = 1.425V to 3.6V, 10mV hysteresisFB low440450460mV
POK Output Voltage, LowVFB = 0.4V or 0.6V, IPOK = 2mA25200mV
Note 1:Maximum power dissipation is obtained using JEDEC JESD51-5 and JESD51-7 standards.
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
Note 2:Specifications to TA= -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)
(VEN = VIN = 1.8V, VOUT = 1.5V, IOUT = 2mA, TA = -40°C to +85°C, typical values are at TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETERCONDITIONSMINTYPMAXUNITS
POK Output Current, HighVPOK = 3.6V VFB = 0.50.0011µA
POK Delay TimeFrom FB rising to POK high2550100µs
EN rising1.25Enable Input ThresholdVIN = 1.425V to 3.6VEN falling0.4V
Enable Input Bias CurrentVEN = 0V or 3.6V-1+1µA
THERMAL SHUTDOWN
TJ rising+160Thermal-Shutdown ThresholdOutput on and offTJ falling+115°C
POR
FB Power-On Reset Fault ThresholdFB falling, VIN = 1.425V to 3.6V, 10mV hysteresis440450460mV
POR Output Voltage, LowVFB = 0.4V, IPOR = 2mA25200mV
POR Output Current, HighVPOR = 3.6V, VFB = 0.5V0.0011µA
POR Rising Delay TimeFB rising to POR high impedance100140200ms
SOFT-START
Soft-Start Time100µs
Typical Operating Characteristics
(VEN = VIN= +1.8V, VOUT= +1.5V, IOUT = 4A, COUT= 20µF, CIN= 20µF, and TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8556 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
TA = -25°C
TA = -40°C
TA = -85°C
ILOAD = 2A
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX8556 toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)21
TA = -40°C
TA = +85°C
TA = +25°C
GND CURRENT vs. INPUT VOLTAGE
MAX8556 toc03
INPUT VOLTAGE (V)
GND CURRENT (
ILOAD = 4A
ILOAD = 2A
ILOAD = 0A
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulatorsypical Operating Characteristics (continued)
(VEN = VIN= +1.8V, VOUT= +1.5V, IOUT = 4A, COUT= 20µF, CIN= 20µF, and TA= +25°C, unless otherwise noted.)
GND CURRENT vs. TEMPERATURE
MAX8556 toc04
TEMPERATURE (°C)
GND CURRENT (3510-15
ILOAD = 2A
ILOAD = 0A
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8556 toc05
LOAD CURRENT (A)
DROPOUT VOLTAGE (mV)
VIN = 1.5V
LINE-TRANSIENT RESPONSE
MAX8556 toc06
100μs/div
1.8V
10mV/div
2.5V
VIN
VOUT
(AC-COUPLED)
4A LOAD-TRANSIENT RESPONSE
MAX8556 toc07
40μs/div
2A/div
50mV/divVOUT
(AC-COUPLED)
IOUT
2A LOAD-TRANSIENT RESPONSE
MAX8556 toc08
40μs/div
1A/div
50mV/divVOUT
(AC-COUPLED)
IOUT
ENABLE WAVEFORMS
MAX8556 toc09
100μs/div
1V/div
2V/divVEN
VOUT
SHORT-CIRCUIT WAVEFORMS
MAX8556 toc10
200μs/div
1V/div
5A/div
2V/divVIN
3.6V
VOUT
IOUT
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
EXPOSED PADDLE TEMPERATURE
vs. AMBIENT TEMPERATURE
MAX8556 toc13
AMBIENT TEMPERATURE (°C)
EXPOSED PADDLE TEMPERATURE (
°C)513417
DATA TAKEN USING
MAX8556 EVALUATION KIT
FB REGULATION vs. TEMPERATURE
MAX8556 toc14
TEMPERATURE (°C)
FB (V)3510-15
ILOAD = 50mA
FOLDBACK CURRENT-LIMIT WAVEFORMS
MAX8556 toc15
100μs/div
500mV/div
5A/div
VOUT
IOUT
CURRENT-LIMIT THRESHOLD
vs. TEMPERATURE
MAX8556 toc16
TEMPERATURE (°C)
CURRENT-LIMIT THRESHOLD (A)3510-15
PSRR vs. FREQUENCY
MAX8556 toc11
FREQUENCY (kHz)
PSRR (dB)
VIN = 2.5V
ILOAD = 1A
STARTUP WAVEFORMS
MAX8556 toc12
100μs/div
1V/div
2V/div
2A/div
VIN
IIN
VOUT
Typical Operating Characteristics (continued)
(VEN = VIN= +1.8V, VOUT= +1.5V, IOUT = 4A, COUT= 20µF, CIN= 20µF, and TA= +25°C, unless otherwise noted.)
MAX8556/MAX8557
4A Ultra-Low-Input-Voltage
LDO Regulators
Pin Description
PINNAMEFUNCTION
1–6INLDO Input. Connect to a 1.425V to 3.6V input voltage. Bypass with a 22µF ceramic capacitor to GND.
7–11OUTLDO Output. Bypass with 2 x 10µF ceramic capacitors to GND. A smaller capacitance can be used if
the maximum load current is less than 4A.
POK
(MAX8556)
Power-OK Output. Open-drain output that pulls low when VOUT is outside ±10% of the expected
regulation voltage or when EN is low. POK is high impedance when VOUT is within ±10% of the
nominal output voltage. Connect a resistor from POK to a logic supply of less than 3.6V.
POR
(MAX8557)
Power-On Reset. Open-drain output goes high impedance 140ms after the output is above 90% of its
nominal regulation voltage. POR pulls low immediately after an output fault or when EN is low.
Connect a resistor from POR to a logic supply of less than 3.6V.FBFeedback Input. VFB is regulated to 0.5V. Connect to the center tap of a resistor-divider from output
to GND to set the desired output voltage.GNDGroundN.C.Connect to GND or Leave UnconnectedENEnable Input. Connect to GND or a logic low to shut down the device. Connect to IN or a logic high
for normal operation.EPExposed Paddle. Connect to GND and to a ground plane for heatsinking.
MAX8556
(MAX8557)
THERMAL-
OVERLOAD
PROTECTION
REF
SHUTDOWN
LOGIC
ERROR
AMP
CURRENT-
LIMIT
COMPARATOR
THRESHOLD
GND
0.50V
OUT
POK
(POR)
0.45V
0.55V
UNDERVOLTAGE
LOCKOUT
POK (POR)
CIRCUITRYN
Block Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX8557ETE+ \|MAX8557ETE	MAXIM	N/a	60	avai	4A Ultra-Low-Input-Voltage LDO Regulators
MAX8557ETE+	N/A	N/a	2500	avai	4A Ultra-Low-Input-Voltage LDO Regulators
MAX8557ETE+T \|MAX8557ETET	MAXIM	N/a	164	avai	4A Ultra-Low-Input-Voltage LDO Regulators
MAX8557ETE-T \|MAX8557ETET	MAXIM	N/a	326	avai	4A Ultra-Low-Input-Voltage LDO Regulators
MAX8556ETE+ \|MAX8556ETE	MAX	N/a	2500	avai	4A Ultra-Low-Input-Voltage LDO Regulators
MAX8556ETE+ \|MAX8556ETE	MAXIM	N/a	2500	avai	4A Ultra-Low-Input-Voltage LDO Regulators
MAX8556ETE+T	MAXIM	N/a	2500	avai	4A Ultra-Low-Input-Voltage LDO Regulators