MAX856 Maxim, MAX856 Datasheet - Page 2

• Manufacturer Part Number: MAX856
• Description: 3.3V/5V or Adjustable-Output / Step-Up DC-DC Converters
• Manufacturer: Maxim

ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) ...................................-0.3V, +7V
Switch Voltage (LX to GND) .......................................-0.3V, +7V
S
Reference Current (I
Continuous Power Dissipation (T
ELECTRICAL CHARACTERISTICS
(Circuits of Figure 2, V
Output Voltage
Minimum Start-Up
Supply Voltage
Minimum Operating Voltage
Quiescent Supply Current in
3.3V Mode (Note 2)
No Load Battery Current
Shutdown Quiescent Current
(Note 2)
Peak Inductor Current Limit
Reference Voltage
Reference-Voltage Regulation
LBI Input Threshold
LBI Input Hysteresis
LBO Output Voltage Low
LBO Output Leakage Current
3.3V/5V or Adjustable-Output,
Step-Up DC-DC Converters
—
Note 1: Reverse battery current is measured from the Typical Operating Circuit’s battery input terminal to GND when the battery is
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.
2
H
—
LBI, REF, 3/
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW
D
—
_______________________________________________________________________________________
N
–
, LBO to GND ....................................................-0.3V, +7V
PARAMETER
connected backwards. A reverse current of 750mA will not exceed the SO or CERDIP package dissipation limits but, if left
for an extended time (more than ten minutes), may degrade performance.
–
5
–
, FB to GND .........................-0.3V, (V
REF
IN
) ..................................................2.5mA
= 2.5V, I
2V V
I
I
(FB = 1.5V, MAX857/MAX859 only)
Output set for 3.3V, measured at V
S
(FB = 1.5V, MAX857/MAX859 only)
MAX856/MAX857
MAX858/MAX859
No REF load
3/
With falling edge
I
LBO = 5V
—
A
LOAD
LOAD
SINK
LOAD
H
—
–
5
–
= +70°C)
D
—
= 3V, -20µA
N
–
= 2mA
IN
= 0mA
= 0mA, 3/
= 0V, 3/
= 0mA, T
3V
–
5
–
A
–
5
–
= 3V, LBI = 1.5V, V
= T
= 3V, LBI = 1.5V, V
REF load
MAX856, 3/
MAX856, 3/
MAX857, V
MAX858, 3/
MAX858, 3/
MAX859, V
OUT
MIN
+ 0.3V)
to T
CONDITIONS
MAX
OUT
OUT
250µA, C
–
–
–
–
5
5
5
5
–
–
–
–
= 0V, 0mA
= 3V, 0mA
= 0V, 0mA
= 3V, 0mA
, unless otherwise noted. Typical values are at T
= 5V, 0mA I
= 5V, 0mA I
IN
OUT
in Figure 2, R3 omitted.
Reverse Battery Current (T
Operating Temperature Ranges
Junction Temperature .....................................................+150°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
OUT
REF
MAX85_C_ _ ......................................................0°C to +70°C
MAX85_E_ _ ....................................................-40°C to +85°C
MAX85_MJA .................................................-55°C to +125°C
= 3.47V,
= 3.47V,
= 0.22µF
I
I
I
I
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
100mA
25mA
MAX85_C
MAX85_E/M
100mA
150mA
25mA
35mA
A
+45°C, Note 1) .................750mA
MIN
4.80
3.17
4.80
4.80
3.17
4.80
1.23
1.22
TYP
1.25
1.25
500
125
5.0
3.3
5.0
5.0
3.3
5.0
0.8
0.8
0.8
A
25
60
25
1
= +25°C.)
MAX
5.20
3.43
5.20
5.20
3.43
5.20
1.27
1.28
1.8
2.0
0.4
60
1
5
1
UNITS
mA
mV
µA
µA
µA
µA
%
V
V
V
V
V
V