MAX8640Y/MAX8640Z
500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters in SC70
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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 to GND .................................................................-0.3V to +6V
LX, OUT, SHDN to GND ..............................-0.3V to (V
IN
+ 0.3V)
LX Current (Note 1) ........................................................0.8A
RMS
OUTPUT Short Circuit to GND ...................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
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
(V
IN
= 3.6V, SHDN = IN, T
A
= -40°C to +85°C, typical values are at T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Range V
IN
2.7 4.9 V
UVLO Threshold UVLO V
IN
rising, 100mV hysteresis 2.44 2.6 2.70 V
No load, no switching 24 48
T
A
= +25°C 0.01 0.1
Supply Current I
CC
SHDN = GND
T
A
= +85°C 0.1
µA
Output Voltage Range V
OUT
Factory preset 0.8 2.5 V
I
LOAD
= 0mA, T
A
= +25°C -1 0 +1
Output Voltage Accuracy
(Falling Edge)
I
LOAD
= 0mA, T
A
= -40°C to +85°C -2 +2
%
Output Load Regulation
(Voltage Positioning)
Equal to inductor DC resistance R
L
V/A
V
IH
V
IN
= 2.7V to 4.9V 1.4
SHDN Logic Input Level
V
IL
V
IN
= 2.7V to 4.9V 0.4
V
T
A
= +25°C 0.001 1
SHDN Logic Input Bias Current I
IH,IL
V
IN
= 4.9V,
SHDN = GND or IN
T
A
= +85°C 0.01
µA
Peak Current Limit I
LIMP
pFET switch 590 770 1400 mA
Valley Current Limit I
LIMN
nFET rectifier 450 650 1300 mA
Rectifier Off-Current Threshold I
LXOFF
nFET rectifier 10 40 70 mA
R
ONP
pFET switch, I
LX
= -40mA 0.6 1.2
On-Resistance
R
ONN
nFET rectifier, I
LX
= 40mA 0.35 0.7
Ω
T
A
= +25°C 0.1 1
LX Leakage Current I
LXLKG
V
IN
= 4.9V, LX = GND
to IN, SHDN = GND
T
A
= +85°C 1
µA
t
ON
MIN
95
Minimum On and Off Times
t
OFF
MIN
95
ns
Thermal Shutdown +160 °C
Thermal-Shutdown Hysteresis 20 °C
Note 1: LX has internal clamp diodes to IN and GND. Applications that forward bias these diodes should not exceed the IC’s package
power-dissipation limit.
Note 2: All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
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