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
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.
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.)
PARAMETER
Output Voltage
Load Regulation
FB Regulation Voltage
FB Input Current
Output Voltage Adjust Range
Output Undervoltage Lockout
Frequency in Startup Mode
Minimum Startup Voltage
Minimum Operating Voltage
Soft-Start Pin Current
OUT Supply Current
OUT Leakage Current In
Shutdown
LX Leakage Current
n-Channel Switch
On-Resistance
n-Channel Current Limit
RMS Switch Current
Reference Voltage
Reference Load Regulation
Reference Supply Rejection
(Note 3)
V
OUT
=1.5V
I
OUT
< 1mA (Note 1), T
A
= +25°C (Note 4)
(Note 5)
V
SS/LIM
= 1V
V
FB
= 1.5V (Note 6)
V
ONB
= 3.6V
V
LX
= V
ONB
= V
OUT
= +5.5V
3.2
V
FB
< 0.1V (Note 1)
CONDITIONS
3.3/5 = GND, I
SW
= 1A
3.3/5 = OUT, I
SW
= 1A
MIN
3.26
4.92
1.215
2.5
2.0
40
0.9
0.7
4
200
0.1
0.1
22
SS/LIM = open
SS/LIM = 150kΩ to GND
MAX1709EUI+
MAX1709ESE
I
REF
= 0
-1µA < I
REF
< 50µA
+2.5V < V
OUT
< +5.5V
ONA,
ONB,
3.3/5, 1.2V < V
OUT
< 5.5V
Input Low Level (Note 7)
CLK, 2.7V < V
OUT
< 5.5V
1.245
1.260
4
0.2
7.5
3.5
9
5
5.0
440
5
40
40
12
6.5
10
6
1.275
10
5
0.2
×
V
OUT
0.2
×
V
OUT
TYP
3.34
5.05
-0.25
1.240
1
MAX
3.42
5.17
-0.45
1.265
200
5.5
2.3
400
1.1
UNITS
V
%/A
V
nA
V
V
kHz
V
V
µA
µA
µA
µA
mΩ
A
A
RMS
V
mV
mV
Measured between 1A < I
SW
< 3A (Note 2)
I
SW
= 1A
V
FB
= +1.5V
V
www.maximintegrated.com
Maxim Integrated | 2
MAX1709
4A, Low-Noise, High-Frequency,
Step-Up DC-DC Converter
Electrical Characteristics (continued)
(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.)
PARAMETER
Input High Level
Logic Input Current
Internal Oscillator Frequency
Maximum Duty Cycle
External Clock Frequency
Range
CLK Pulse Width
CLK Rise/Fall Time
CONDITIONS
ONA,
ONB,
3.3/5, 1.2V < V
OUT
<5.5
CLK, 2.7 V< V
OUT
< 5.5V
ONA,
ONB,
CLK, 3.3/5
520
82
350
(Note 8)
(Note 8)
100
50
600
90
MIN
0.8
×
V
OUT
0.8
×
V
OUT
1
680
94
1000
TYP
MAX
UNITS
V
µA
kHz
%
kHz
ns
ns
Electrical Characteristics
(V
OUT
= V
CLK
= +3.6V, ONA =
ONB
= FB = GND,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 9)
PARAMETER
Output Voltage
FB Regulation Voltage
FB Input Current
Load Regulation
Soft-Start Pin Current
OUT Leakage Current in
Shutdown
OUT Supply Current
n-Channel Switch
On-Resistance
n-Channel Current Limit
Reference Voltage
SS/LIM = unconnected
SS/LIM = 150kΩ to GND
I
REF
= 0
7.5
3.5
1.24
(Note 1)
I
SW
= 1A
V
FB
= +1.5V
Measured between 1A < I
SW
< 5A (Note 2)
SS/LIM = 1V
V
ONB
= 3.6V
V
FB
= 1.5V (Note 6)
3.2
CONDITIONS
V
FB
< 0.1V, V
IN
= +2.4V
3.3/5 = GND, I
SW
= 1A
3.3/5 = OUT, I
SW
= 1A
MIN
3.24
4.9
1.21
TYP
MAX
3.45
5.2
1.27
200
-0.45
5.2
5
400
40
15
7
1.28
UNITS
V
V
nA
%/A
µA
µA
µA
mΩ
V
V
www.maximintegrated.com
Maxim Integrated | 3
MAX1709
4A, Low-Noise, High-Frequency,
Step-Up DC-DC Converter
Electrical Characteristics (continued)
(V
OUT
= V
CLK
= +3.6V, ONA =
ONB
= FB = GND,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 9)
PARAMETER
CONDITIONS
ONA,
ONB,
3.3/5, 1.2V < V
OUT
< 5.5V
Input Low Level (Note 7)
CLK, 2.7V < V
OUT
< 5.5V
ONA,
ONB,
3.3/5, 1.2V < V
OUT
< 5.5V
Input High Level
CLK, V
OUT
= 5.5V
Logic Input Current
Internal Oscillator Frequency
Maximum Duty Cycle
External Clock Frequency
Range
CLK/SEL Pulse Width
CLK/SEL Rise/Fall Time
(Note 8)
(Note 8)
ONA,
ONB,
CLK, 3.3/5
500
80
350
100
50
0.8
×
V
OUT
0.8
×
V
OUT
1
700
95
1000
MIN
TYP
MAX
0.2
×
V
OUT
0.2
×
V
OUT
UNITS
V
V
µA
kHz
%
kHz
ns
ns
Note 1:
Output voltage is specified at 1A switch current I
SW
, which is equivalent to approximately 1A
(V
IN
/ V
OUT
) of load current.
Note 2:
Load regulation is measured by forcing specified switch current and straight-line calculation of change in output voltage in
external feedback mode. Note that the equivalent load current is approximately I
SW
(V
IN
/ V
OUT
).
Note 3:
Until undervoltage lockout is reached, the device remains in startup mode. Do not apply full load until this voltage is
reached.
Note 4:
Startup is tested with Figure 1’s circuit. Output current is measured when both the input and output voltages are applied.
Note 5:
Minimum operating voltage. The MAX1709 is bootstrapped and will operate down to a 0.7V input once started.
Note 6:
Supply current is measured from the OUT pin to the output voltage (+3.3V). This correlates directly with actual input supply
current but is reduced in value according to the step-up ratio and efficiency.
Note 7:
ONA and
ONB
inputs have approximately 0.15V hysteresis.
Note 8:
Guaranteed by design, not production tested.
Note 9:
Specifications to -40°C are guaranteed by design, not production tested.
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