Rainbow Electronics MAX1848 - Manual (Page 3)

MAX1848
White LED Step-Up Converter in SOT23
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DC ELECTRICAL CHARACTERISTICS (continued)
(V+ = 3V, V
OUT
= 11V, L = 33µH, C
OUT
= 1µF, C
COMP
= 0.15µF, R
SENSE
= 5 Ω, V
CTRL
= 1V, T
A
= 0 °C to +85°C, unless otherwise
noted. Typical values are at T
A
= +25 °C.)
DC ELECTRICAL CHARACTERISTICS
(V+ = 3V, V OUT = 11V, L = 33µH, C OUT = 1µF, C COMP = 0.15µF, R SENSE = 5 Ω, V
CTRL = 1V, T A = -40 °C to +85°C, unless otherwise
noted. (Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
N-CHANNEL SWITCH
LX On-Resistance I LX = 100mA 1.4 2.2 Ω
T A = +25 °C 0.01 2
LX Leakage Current V OUT = V LX = 13V
T A = +85 °C 0.05
µA
LX Current Limit Duty cycle = 65% 300 500 750 mA
PARAMETER CONDITIONS MIN MAX UNITS
Supply Voltage 2.6 5.5 V
V+ rising, 40mV hysteresis typical 2.15 2.59
Undervoltage Lockout Threshold
V+ falling 2.10 2.56
V
Not switching, V CTRL = V CS = V+ 0.4
Quiescent Current
Switching, V CTRL = V+, V CS = GND 2
mA
V+ rising, 1V hysteresis typical 12.25 14.00
Overvoltage Threshold
V+ falling 11.25 13.25
V
V CTRL > 0.25V 10 30
OUT Input Bias Current V OUT = 13V
V
CTRL
= GND 1
µA
Output Voltage Range
V+ -
V DIODE
12.25 V
ERROR AMPLIFIER
CTRL to CS Regulation V CTRL = 2V, V+ = 2.6V to 5.5V 65 85 mV/V
CS Input Bias Current V CS = V CTRL /13.33 1 µA
CTRL Input Resistance 450 1100 k Ω
CTRL Dual Mode Threshold Hysteresis = 25mV typical 100 240 mV
COMP Pin Resistance to Ground Device in shutdown or overvoltage 7.5 50.0 k Ω
COMP Output Voltage Swing 0.3 2.4 V
OSCILLATOR
Operating Frequency 0.9 1.6 MHz
Maximum Duty Cycle V CTRL = V+, V CS = GND 85 97 %
N-CHANNEL SWITCH
LX On-Resistance I LX = 100mA 2.2 Ω
LX Current Limit Duty cycle = 65% 225 850 mA
Note 1: Limits are 100% production tested at T A = +25°C. Limits over the operating temperature range are guaranteed through cor-
relation using statistical quality control (SQC) methods.