Rainbow Electronics MAX1708 User Manual
Page 2
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
m
Ω
SS/LIM = open
4.5
5.3
7.0
N-Channel Current Limit
SS/LIM = 150k
Ω to GND
1.80
3.00
3.85
A
RMS Switch Current
5
A
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