Rainbow Electronics MAX849 User Manual
Page 2
mA
MAX848/MAX849
1-Cell to 3-Cell, High-Power,
Low-Noise, Step-Up DC-DC Converters
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
OUT
= 3.6V, GND = PGND = CLK/SEL = ON1 =
ON2 = AINSEL = AIN1 = AIN2 = FB = POKIN, POUT = OUT,
T
A
= 0°C to +85°C
,
unless otherwise noted.)
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.
ON1, ON2, OUT, POUT to GND..................................-0.3V, +6V
PGND to GND ..........................................................-0.3V, +0.3V
LX to PGND ...............................................-0.3V, (V
POUT
+ 0.3V)
CLK/SEL, DATA, POKIN, REF,
AINSEL, AIN1, AIN2, FB, POK to GND .....-0.3V, (V
OUT
+ 0.3V)
Continuous Power Dissipation (T
A
= +70°C)
Narrow SO (derate 8.7mW/°C above +70°C) ................696mW
Operating Temperature Range
MAX848ESE/MAX849ESE .................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature.........................................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
110
300
70
V
IN
= 1.2V
200
200
750
V
OUT
= 5V
mA
1000
130
Output Current
V
IN
= 2.4V
500
I
REF
= 0mA
250
600
150
V
IN
= 2.7V
800
µA
4
20
300
Operating Current in Shutdown
kHz
40
300
Frequency in Start-Up Mode
V
0.9
1.1
Minimum Start-Up Voltage (Note 5)
%
-1.6
(Note 3)
Load Regulation (Note 4)
V
1.23
1.25
1.27
Reference Output Voltage
Current into OUT pin, V
ON2
= 3.6V
V
0.7
V
OUT
= 1.5V
Minimum Operating Voltage (Note 1)
V
2.1
2.4
V
FB
= 1.25V
Output Voltage Lockout Range
V
2.7
5.5
Adjustable output, CLK/SEL = OUT
Output Voltage Adjust Range
nA
200
-1µA < I
REF
< 50µA
FB Input Current
V
1.215
1.240
1.265
2.5V < V
OUT
< 5V
FB Regulation Voltage
mV
5
15
REF Load Regulation
mV
0.2
5
I
LOAD
< 1mA, T
A
> +25°C
REF Supply Rejection
V
FB
< 0.1V, CLK/SEL = OUT
V
3.17
3.34
3.40
CLK/SEL = OUT
Output Voltage (Note 2)
UNITS
MIN
TYP
MAX
PARAMETER
MAX848
MAX849
MAX848
MAX849
MAX848
MAX849
MAX848
MAX849
MAX848
MAX849
MAX848
MAX849
CONDITIONS
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= 3.3V
MAX849, V
IN
= 3.6V
V
OUT
= 5V
V
OUT
= 3.3V
V
OUT
= 5V
MAX848, V
IN
= 3.3V
DC-DC CONVERTER
REFERENCE