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MAX8560EZK+T-MAX8560EZK-T-MAX8561ETA+T
4MHz, 500mA Synchronous Step-Down DC-DC Converters in Thin SOT and TDFN
General DescriptionThe MAX8560/MAX8561/MAX8562 step-down DC-DC
converters are optimized for applications that prioritize
small size and high efficiency. They utilize a proprietary
hysteretic-PWM control scheme that switches with fixed
frequency and is adjustable up to 4MHz, allowing cus-
tomers to trade efficiency for smaller external compo-
nents. Output current is guaranteed up to 500mA, while
quiescent current is only 40µA (typ).
Internal synchronous rectification greatly improves effi-
ciency and eliminates the external Schottky diode
required in conventional step-down converters. Built-in
soft-start eliminates inrush current to reduce input
capacitor requirements. The MAX8561 features logic-
controlled output voltage, while the MAX8562 drives an
external bypass FET.
The MAX8560 is available in a 5-pin Thin SOT23 pack-
age. The MAX8561/MAX8562 are available in space-
saving 8-pin 3mm x 3mm Thin DFN packages.
ApplicationsMicroprocessor/DSP Core Supplies
Cellular and Smart Phones
CDMA/RF Power-Amplifier Supplies
PDAs, DSC, and MP3 Players
FeaturesUp to 4MHz PWM Switching Frequency500mA Guaranteed Output Current 40µA (typ) Quiescent CurrentAdjustable Output Voltage from 0.6V to 2.5VLogic-Controlled Output Voltage (MAX8561)Drives External Bypass FET (MAX8562)±1.5% Initial AccuracySoft-Start Eliminates Inrush CurrentFast Voltage-Positioning Transient ResponseInternal Synchronous Rectifier2.7V to 5.5V Input0.1µA Logic-Controlled ShutdownThermal ShutdownThin SOT23 or Space-Saving 3mm x 3mm x
0.8mm TDFN Packages
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
Ordering InformationGNDLX
SHDNON/OFF
OUTPUT
0.6V TO 2.5V
UP TO 500mA
INPUT
2.7V TO 5.5V
1μH
COUT
2.2μF
CIN
2.2μF
CFFR1
MAX8560
Typical Operating Circuit19-2954; Rev 2; 8/05
EVALUATION KITAVAILABLE
PARTTEMP RANGEPIN-PACKAGETOP
MARK
MAX8560EZK-T-40°C to +85°C5 Thin SOT23-5ADRX
MAX8560EZK+T-40°C to +85°C5 Thin SOT23-5ADRX
MAX8561ETA-T-40°C to +85°C8 TDFNAHD
MAX8561ETA+T-40°C to +85°C8 TDFNAHD
MAX8562ETA-T-40°C to +85°C8 TDFNAHE
MAX8562ETA+T-40°C to +85°C8 TDFNAHE
GNDSHDNLXIN
MAX8560
Thin SOT23-5TOP VIEW
TDFN3mm × 3mm × 0.8mmODO
ODI2
SHDNGND
PGND4
MAX8561/
MAX8562 765
A "+" sign will replace the first pin indicator
on lead-free packages.
Pin Configurations+Denotes lead-free package.
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
ABSOLUTE MAXIMUM RATINGSStresses 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, FB, SHDN, ODI, ODO to GND............................-0.3V to +6V
LX to GND (Note 1)......................................-0.3V to (VIN+ 0.3V)
PGND to GND.......................................................-0.3V to +0.3V
LX Current...........................................................................1.27A
Output Short Circuit to GND
(typical operating circuit)....................................................10s
Continuous Power Dissipation (TA= +70°C)
5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C)....727mW
8-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mW
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
ELECTRICAL CHARACTERISTICS(VIN= 3.6V, SHDN= IN, TA= -40°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVIN2.75.5V
UVLO ThresholdUVLOVIN rising, 60mV hysteresis2.42.52.6V
ILOAD = 0mA, no switching4080
TA = +25°C0.010.1Supply CurrentIINSHDN = GNDTA = +85°C0.1
Output Voltage RangeVOUT0.62.5V
FB Threshold VoltageVFBVFB falling0.6V
FB Threshold Line RegulationVIN = 2.7V to 5.5V0.3% / V
FB Threshold Load RegulationIOUT = 0 to 500mA-0.001%/mA
TA = +25°C-1.5+1.5FB Threshold Voltage Accuracy
(Falling) (% of VFB)ILOAD = 0mATA = -40°C to +85°C-2.5+2.5%
FB Threshold Voltage Hysteresis
(% of VFB)VHYS1.0%
SHDN = GND, TA = +25°C, VIN = 5.5V0.010.1
SHDN = GND, TA = +85°C, VIN = 5.5V0.1
VFB = 0.5V, TA = +25°C, VIN = 5.5V0.010.1FB Bias CurrentIFB
VFB = 0.5V, TA = +85°C, VIN = 5.5V0.1
Logic Input High Voltage
(SHDN, ODI)VIHVIN = 2.7V to 5.5V1.41
Logic Input Low Voltage
(SHDN, ODI)VILVIN = 2.7V to 5.5V0.4
VIN = 5.5V, SHDN = ODI = GND or IN,
TA = +25°C0.0010.1
Logic Input Bias CurrentIIH, IIL
VIN = 5.5V, SHDN = ODI = GND or IN,
TA = +85°C0.01
ODO Output Low Voltage
(MAX8562 Only)VOL1mA sink current, VIN = 2.7V0.020.1V
Note 1:LX has internal clamp diodes to PGND (GND for MAX8560) and IN. Applications that forward bias these diodes should take
care not to exceed the IC’s package power-dissipation limits.
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
ELECTRICAL CHARACTERISTICS (continued)(VIN= 3.6V, SHDN= IN, TA= -40°C to +85°C, typical values are at TA= +25°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSODO Pullup to IN (MAX8562 Only)51020kΩ
VIN = 5.5V, ODO = IN, TA = +25°C0.010.1Open-Drain Output LeakageIOHLEAKVIN = 5.5V, ODO = IN, TA = +85°C0.1µA
ILIMPPFET switch6009901500Current LimitILIMNNFET rectifier490680900mA
RONPPFET switch, ILX = -40mA0.81.5On-ResistanceRONNNFET rectifier, ILX = +40mA0.40.82Ω
Rectifier-Off Current ThresholdILXOFF03060mA
VIN = 5.5V, LX = GND to IN, ODO = IN,
TA = +25°C, SHDN = GND0.11
LX Leakage CurrentILXLKG
VIN = 5.5V, LX = GND to IN, ODO = IN,
TA = +85°C, SHDN = GND1
tON(MIN)107Minimum On- and Off-TimestOFF(MIN)95ns
Thermal Shutdown+160°C
Thermal-Shutdown Hysteresis20°C
Typical Operating Characteristics(VIN= 3.6V, VOUT= 1.2V, L = 1µH (LQH32CN1R0M53), COUT= 2.2µF, TA= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)MAX8560 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
4.7μH
2.2μH
1μH
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.8V)MAX8560 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
4.7μH
2.2μH1μH
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.5V)MAX8560 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
4.7μH
2.2μH1μH
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.2V)MAX8560 toc04
LOAD CURRENT (mA)
EFFICIENCY (%)
4.7μH
2.2μH1μH
EFFICIENCY vs. LOAD CURRENT
(VOUT = 0.9V)MAX8560 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
4.7μH
2.2μH1μH
EFFICIENCY vs. LOAD CURRENT
(LOAD = 7.5Ω)MAX8560 toc06
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
4.7μH
2.2μH1μH
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX8560 toc07
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
R1 = R2 = 100kΩ
SWITCHING FREQUENCY
vs. LOAD CURRENTMAX8560 toc08
LOAD CURRENT (mA)
FREQUENCY (MHz)
4.7μH
2.2μH
1μH
OUTPUT VOLTAGE vs. LOAD CURRENT
(VOLTAGE POSITIONING)MAX8560 toc09
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
R1 = R2 = 100kΩ
LIGHT-LOAD SWITCHING WAVEFORMSMAX8560 toc10
200ns/div
200mA/div
VLX
2V/div
VOUT
20mV/div
50mA LOAD
HEAVY-LOAD SWITCHING WAVEFORMSMAX8560 toc11
200ns/div
200mA/div
VLX
2V/div
VOUT
20mV/div
200mA LOAD
ypical Operating Characteristics (continued)(VIN= 3.6V, VOUT= 1.2V, L = 1µH (LQH32CN1R0M53), COUT= 2.2µF, TA= +25°C, unless otherwise noted.)
MAX8560/MAX8561/MAX8562
4MHz, 500mA Synchronous Step-Down
DC-DC Converters in Thin SOT and TDFN
HEAVY-LOAD SOFT-START WAVEFORMSMAX8560 toc13
20μs/div
200mA/div
IIN
200mA/div
VSHDN
2V/div
VOUT
1V/div
3Ω LOAD
LINE-TRANSIENT RESPONSEMAX8560 toc14
2μs/div
200mA/div
VIN
500mV/div
VOUT
20mV/div
5Ω LOAD
VIN = 4.0V
VIN = 3.5V
LOAD-TRANSIENT RESPONSEMAX8560 toc15
2μs/div
500mA/div
ILOAD
500mA/div
VOUT
50mV/div
20mA LOAD
500mA LOAD
20mA LOAD
OUTPUT-VOLTAGE TRANSIENT RESPONSE
(MAX8561)MAX8560 toc16
40μs/div
200mA/div
VODI
2V/div
VOUT
500mV/div
7.5Ω LOAD, L = 2.2μH
VOUT = 1.0V
VOUT = 1.5V
BYPASS-FET TRANSIENT RESPONSE
(MAX8562)MAX8560 toc17
20μs/div
500mA/div
VODI
2V/div
VOUT
2V/div
7.5Ω LOAD
VOUT = 1.2V
VOUT = VIN
LIGHT-LOAD SOFT-START WAVEFORMSMAX8560 toc12
20μs/div
200mA/div
IIN
200mA/div
VSHDN
2V/div
VOUT
1V/div
100Ω LOAD
Typical Operating Characteristics (continued)(VIN= 3.6V, VOUT= 1.2V, L = 1µH (LQH32CN1R0M53), COUT= 2.2µF, TA= +25°C, unless otherwise noted.)
