MAX1708
High-Frequency, High-Power, Low-Noise,
Step-Up DC-DC Converter
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
OUT
= V
CLK
= +3.6V, ONA = ONB = FB = GND, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
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.
ONA, ONB, OUT, SS/LIM, 3.3/5 to GND ...............-0.3V to +6.0V
LX to PGND ...........................................................-0.3V to +6.0V
FB, CLK, REF to GND.............................. -0.3V to (V
OUT
+ 0.3V)
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.30mW/°C above +70°C). .......667mW
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
PARAMETER CONDITIONS MIN TYP MAX UNITS
3.3/5 = GND, I
SW
= 0.5A 3.26 3.34 3.42
Output Voltage V
FB
< 0.1V (Note 1)
3.3/5 = OUT, I
SW
= 0.5A 4.90 5.05 5.20
V
Load Regulation Measured between 0.5A < I
SW
< 1.5A (Note 2) -0.40 -0.60 %/A
FB Regulation Voltage (V
FB
)I
SW
= 0.5A 1.215 1.240 1.265 V
FB Input Current V
FB
= +1.5V
1
200 nA
Output Voltage Adjust Range 2.5 5.5 V
Output Undervoltage Lockout
(Note 3)
Rising and falling 2.0 2.3 V
Frequency in Startup Mode V
OUT
=1.5V 40 400 kHz
Minimum Startup Voltage I
OUT
< 1mA, T
A
= +25°C (Note 4) 0.9 1.1 V
Minimum Operating Voltage (Note 5) 0.7 V
Soft-Start Pin Current V
SS/LIM
= 1V 3.2 4 5.0 µA
OUT Supply Current V
FB
= 1.5V (Note 6) 200 300 µA
OUT Leakage Current In
Shutdown
V
ONB
= 3.6V 0.1 2 µA
LX Leakage Current V
LX
= V
ONB
= V
OUT
= +5.5V 1 25 µA
N-Channel Switch
On-Resistance
30 80 mΩ
SS/LIM = open
4.5
5.3
7.0
N-Channel Current Limit
SS/LIM = 150kΩ to GND
1.80
3.00
3.85
A
RMS Switch Current 5A
RMS
Reference Voltage I
REF
= 0 1.245 1.260 1.275 V
Reference Load Regulation -1µA ≤ I
REF
≤ 50µA 4 10 mV
Reference Supply Rejection +2.5V ≤ V
OUT
≤ +5.5V 0.2 5 mV
ONA, ONB, 3.3/5, 1.2V < V
OUT
< 5.5V 0.2
✕
V
OUT
Input Low Level (Note 7)
CLK, 2.7V < V
OUT
< 5.5V 0.2
✕
V
OUT
V
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