Rainbow Electronics MAX849 - Manual (Page 3)

MAX848/MAX849
1-Cell to 3-Cell, High-Power,
Low-Noise, Step-Up DC-DC Converters
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ELECTRICAL CHARACTERISTICS (continued)
(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.)
Input Low Voltage
1.2V < V OUT < 5.5V, ON1 and ON2 (Note 8) 0.2V OUT
Accuracy
V
Current into OUT pin, CLK/SEL = GND
V OUT = 2.7V, AINSEL and CLK/SEL
f CLK = 400kHz, 5ms conversion,
monotonic to 8 bits
±4 % FSR
0.2V OUT
Internal Trip Level
µA
Rising V
OUT
, V
POKIN
< 0.1V 2.95 3.10 V
External Trip Level
Input High Voltage
Rising V POKIN 1.225 1.275
µA 1 2 f CLK = 400kHz, V AIN1 = V AIN2 = 2.5V AIN1, AIN2 Input Current
V 0 2.5 AINSEL = OUT AIN2 Input Voltage Range
V 0.625 1.875 AINSEL = GND AIN1 Input Voltage Range
V V OUT - 0.4
V
Data Output Voltage High
V 0.4
I SOURCE = 1mA
Data Output Voltage Low I SINK = 1mA
POK Low Voltage
1.2V < V OUT < 5.5V, ON1 and ON2 (Note 8)
I SINK = 1mA, V OUT = 3.6V or
I
SINK
= 20µA, V
OUT
= 1V
0.4 V
POK High Leakage Current
0.8V OUT
V OUT = V POK = 5.5V 0.01 1 µA
POKIN Leakage Current
V
V POKIN = 1.5V 50 nA
35 90
V OUT = 5.5V, AINSEL and CLK/SEL 0.8V OUT
Operating Current in Low-Power
Mode (Note 6)
Logic Input Current ON1, ON2, AINSEL and CLK/SEL 1 µA
Internal Oscillator Frequency CLK/SEL = OUT 260 300 340 kHz
Oscillator Maximum Duty Cycle 80 85 90 %
External Clock Frequency Range 200 400 kHz
CLK/SEL Pulse Width Not tested 200 ns
CLK/SEL Rise/Fall Time Not tested 100 ns
Current into OUT pin, CLK/SEL = OUT,
does not include switching losses
µA
150 300
UNITS MIN TYP MAX CONDITIONS PARAMETER
Operating Current in Low-Noise
Mode (Note 6)
V
LX
= 0V, V ON2 = V
OUT
= 5.5V µA 0.1 20 POUT Leakage Current
V LX = V ON2 = V OUT = 5.5V µA 0.1 20 LX Leakage Current
N-channel
0.3 0.6 CLK/SEL = GND
0.13 0.25 CLK/SEL = OUT
P-channel
Ω
0.25 0.5
Switch On-Resistance
CLK/SEL = OUT
600 800 1000 MAX848
CLK/SEL = OUT
1100 1350 1600 MAX849
120 200 300 MAX848
V CLK/SEL = 0V (Note 7)
mA
250 400 550
N-Channel Current Limit
MAX849
DC-DC SWITCHES
ADC
POWER-GOOD
LOGIC AND CONTROL INPUTS