Rainbow Electronics MAX17067 User Manual
Page 2
MAX17067
Low-Noise Step-Up DC-DC Converter
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= SHDN = 3V, FREQ = 3V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
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.
LX to GND ..............................................................-0.3V to +22V
SHDN, FREQ to GND ............................................-0.3V to +7.5V
IN to GND (Note 1) ...................................................-0.3V to +6V
SS, COMP, FB to GND ................................-0.3V to (V
IN
+ 0.3V)
RMS LX Pin Current ..............................................................1.2A
Continuous Power Dissipation (T
A
= +70°C)
8-Pin μMAX (derate 4.1mW/°C above +70°C) ............330mW
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
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Input Supply Range
V
IN
V
OUT
< 18V
2.6
4.0
V
Output Voltage
18
V
Input Supply Clamp Voltage
Use external limiting resistor; R
IN
= 100
,
V
IN
= 10V (Note 3)
6.05 6.40 6.60 V
V
IN
Undervoltage Lockout
UVLO
V
IN
rising, typical hysteresis is 50mV, LX
remains off below this level
2.30 2.45 2.57 V
V
FB
= 1.3V, not switching
0.3
0.6
Quiescent Current
I
IN
V
FB
= 1.0V, switching
1.5
2.5
mA
SHDN = GND, T
A
= +25°C
30
60
Shutdown Supply Current
I
IN
SHDN = GND, T
A
= +85°C
30
μA
ERROR AMPLIFIER
Feedback Voltage
V
FB
Level to produce V
COMP
= 1.24V
1.23
1.24
1.25
V
FB Input Bias Current
I
FB
V
FB
= 1.24V
50
125
200
nA
Feedback-Voltage Line
Regulation
Level to produce V
COMP
= 1.24V,
2.6V < V
IN
< 5.5V
0.05
0.15
%/V
Transconductance g
m
I
=
5μA
100 240 440 μS
Voltage Gain
A
V
3800 V/V
OSCILLATOR
FREQ = GND
500 640 780
Frequency f
OSC
FREQ
=
IN
1000 1200 1400
kHz
Maximum Duty Cycle
DC
FREQ = GND, FREQ = IN
89
92
95
%
n-CHANNEL SWITCH
Current Limit
I
LIM
V
FB
= 1V, duty cycle = 68% (Note 4)
1.8
2.4
3.4
A
On-Resistance R
ON
150 275 m
Leakage Current
I
LXOFF
V
LX
= 20V
10
20
μA
Current-Sense Transresistance
R
CS
0.2 0.3 0.4 V/A
SOFT-START
Reset Switch Resistance
100
Charge Current
V
SS
= 1.2V
2.5
4.5
6.5
μA