Datasheet
MAX1709
4A, Low-Noise, High-Frequency,
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 Narrow SO (derate 16.5mW/°C above +70°C) .....1.3W
28-Pin TSSOP Exposed Pad
(derate 23.8mW/°C above +70°C)...................................1.9W
28-Pin TSSOP Exposed Pad Junction-to-Exposed
Pad Thermal Resistance......................................……1.2°C/W
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
= 1A 3.26 3.34 3.42
Output Voltage V
FB
< 0.1V (Note 1)
3.3/5 = OUT, I
SW
= 1A 4.92 5.05 5.17
V
Load Regulation Measured between 1A < I
SW
< 3A (Note 2) -0.25 -0.45 %/A
FB Regulation Voltage I
SW
= 1A 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) 2.0 2.3 V
Frequency in Startup Mode V
OUT
=1.5V 40 400 kHz
Minimum Startup Voltage I
OUT
< 1mA (Note 1), 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) 200 440 µA
OUT Leakage Current In
Shutdown
V
ONB
= 3.6V 0.1 5 µA
LX Leakage Current V
LX
= V
ONB
= V
OUT
= +5.5V 0.1 40 µA
n-Channel Switch
On-Resistance
22 40 mΩ
SS/LIM = open
7.5
9
12
n-Channel Current Limit
SS/LIM = 150kΩ to GND
3.5
5
6.5
A
MAX1709EUI+ 10
RMS Switch Current
MAX1709ESE 6
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