Rainbow-electronics MAX1848 Bedienungsanleitung PDF herunterladen (Seite 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

= 5Ω, V

CTRL

= 1V, T

= 0°C to +85°C, unless otherwise

noted. Typical values are at T

= +25°C.)

DC ELECTRICAL CHARACTERISTICS

(V+ = 3V, V

OUT

= 11V, L = 33µH, C

OUT

= 1µF, C

COMP

= 0.15µF, R

SENSE

= 5Ω, V

CTRL

= 1V, T

= -40°C to +85°C, unless otherwise

noted. (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

N-CHANNEL SWITCH

LX On-Resistance I

= 100mA 1.4 2.2 Ω

= +25°C 0.01 2

LX Leakage Current V

OUT

= V

= 13V

= +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

Not switching, V

CTRL

= V

= V+ 0.4

Quiescent Current

Switching, V

CTRL

= V+, V

= GND 2

V+ rising, 1V hysteresis typical 12.25 14.00

Overvoltage Threshold

V+ falling 11.25 13.25

CTRL

> 0.25V 10 30

OUT Input Bias Current V

OUT

= 13V

CTRL

= GND 1

µA

Output Voltage Range

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

= V

CTRL

/13.33 1 µA

CTRL Input Resistance 450 1100 kΩ

CTRL Dual Mode Threshold Hysteresis = 25mV typical 100 240 mV

COMP Pin Resistance to Ground Device in shutdown or overvoltage 7.5 50.0 kΩ

COMP Output Voltage Swing 0.3 2.4 V

OSCILLATOR

Operating Frequency 0.9 1.6 MHz

Maximum Duty Cycle V

CTRL

= V+, V

= GND 85 97 %

N-CHANNEL SWITCH

LX On-Resistance I

= 100mA 2.2 Ω

LX Current Limit Duty cycle = 65% 225 850 mA

Note 1: Limits are 100% production tested at T

= +25°C. Limits over the operating temperature range are guaranteed through cor-

relation using statistical quality control (SQC) methods.

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