MAX8640Z Maxim Integrated Products, MAX8640Z Datasheet - Page 2

• Manufacturer Part Number: MAX8640Z
• Description: 4MHz/2MHz Synchronous Step-Down DC-DC Converters
• Manufacturer: Maxim Integrated Products

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ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
OUT, SHDN to GND ....................................-0.3V to (V
LX Current (Note 1) ........................................................0.8A
OUTPUT Short Circuit to GND ...................................Continuous
Continuous Power Dissipation (T
ELECTRICAL CHARACTERISTICS
(V
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Note 1: LX has internal clamp diodes to IN and GND. Applications that forward bias these diodes should not exceed the IC’s package
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.
Note 2: All devices are 100% production tested at T
2
Supply Range
UVLO Threshold
Supply Current
Output Voltage Range
Output Voltage Accuracy
(Falling Edge)
Output Load Regulation
(Voltage Positioning)
SHDN Logic Input Level
SHDN Logic Input Bias Current
Peak Current Limit
Valley Current Limit
Rectifier Off-Current Threshold
On-Resistance
LX Leakage Current
Minimum On and Off Times
Thermal Shutdown
Thermal-Shutdown Hysteresis
IN
6-Pin SC70 (derate 3.1mW/°C above +70°C) ..............245mW
_______________________________________________________________________________________
= 3.6V, SHDN = IN, T
power-dissipation limit.
PARAMETER
A
= -40°C to +85°C, typical values are at T
A
= +70°C)
SYMBOL
t
t
OFF(MIN)
ON(MIN)
I
I
UVLO
R
V
LXOFF
R
LXLKG
I
I
I
LIMP
LIMN
IH,IL
V
I
V
V
ONN
OUT
ONP
CC
IN
IH
IL
V
No load, no switching
SHDN = GND
Factory preset
I
I
Equal to inductor DC resistance
V
V
V
SHDN = GND or IN
pFET switch
nFET rectifier
nFET rectifier
pFET switch, I
nFET rectifier, I
V
to IN, SHDN = GND
LOAD
LOAD
IN
IN
IN
IN
IN
A
rising, 100mV hysteresis
= 2.7V to 5.5V
= 2.7V to 5.5V
= 5.5V,
= 5.5V, LX = GND
= +25°C. Limits over the operating temperature range are guaranteed by design.
IN
= 0mA, T
= 0mA, T
+ 0.3V)
RMS
LX
LX
A
A
= -40mA
CONDITIONS
= +25°C
= -40°C to +85°C
= 40mA
A
6-Pin µDFN (derate 2.1mW/°C above +70°C) ..............167.7mW
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
= +25°C, unless otherwise noted.) (Note 2)
T
T
T
T
T
T
A
A
A
A
A
A
= +25°C
= +85°C
= +25°C
= +85°C
= +25°C
= +85°C
2.44
MIN
590
450
2.7
0.8
1.4
10
-1
-2
0.001
+160
TYP
0.01
0.01
0.35
770
650
2.6
0.1
0.6
0.1
28
R
40
95
95
20
0
1
L
MAX
1400
1300
2.70
5.5
0.1
2.5
0.4
1.2
0.7
48
+1
+2
70
1
1
UNITS
V/A
mA
mA
mA
µA
µA
µA
ns
°C
°C
%
Ω
V
V
V
V