Rainbow-electronics MAX8645Y Uživatelský manuál stáhnout pdf (Strana 3)

MAX8645X/MAX8645Y

1x/1.5x/2x White LED Charge Pumps with Two

LDOs in 4mm x 4mm TQFN

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= 3.6V, V

GND

= V

PGND

= 0V, ENM1 = ENM2 = ENF = IN, R

SETM

= R

SETF

= 6.8kΩ, P1 = P2 = unconnected, C

REF

= 0.01µF,

= -40°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.) (Note 1)

PARAMETER CONDITIONS MIN TYP MAX UNITS

1x to 1.5x or 1.5x to 2x Mode

Transition Threshold

90 100 110 mV

Input Voltage-Mode Transition

Hysteresis

150 mV

Charge-Pump Maximum OUT

Current

≥ 3.15V, V

OUT

= 3.9V 580 mA

1x mode (V

- V

OUT

) / I

OUT

0.3 1.0

1.5x mode (1.5V

- V

OUT

) / I

OUT

1.1 4.0Open-Loop OUT Resistance

2x mode (2V

- V

OUT

) / I

OUT

1.5 4.14

Charge-Pump Short-Circuit

Current

OUT

< 1.25V 500 mA

Switching Frequency 1 MHz

OUT Pulldown Resistance in

Shutdown

ENM_ = ENF = GND 5 kΩ

LED DRIVER

SET_ Bias Voltage T

= +25°C 0.6 V

= +25°C 0.01 1

SET_ Leakage in Shutdown ENM_ = ENF = GND

= +85°C 0.1

µA

SET_ Current Range 10 145 µA

SETM-to-Main LED Current Ratio

SETM

)

100% setting, M1–M6 230 A/A

SETF-to-Flash LED Current Ratio

SETF

)

100% setting, F1 and F2 1380 A/A

= +25°C -1.25 +1.25

M_, F_ Current Accuracy

= -40°C to current derating start temperature -4 +4

Maximum Main LED Sink Current R

SETM

= 4.6kΩ, for each M_ 30 mA

Maximum Flash LED Sink Current R

SETF

= 4.12kΩ, I

+ I

400 mA

Current-Derating-Function Start

Temperature

+40 °C

Current-Derating-Function Slope T

= +40°C to +85°C -1.7 %/°C

Dropout Voltage (Note 2) 40 90 mV

1.5x and 2x Regulation Voltage 150 mV

= +25°C 0.01 2

M_, F_ Leakage in Shutdown ENM_ = ENF = GND

= +85°C 0.1

µA

LDO_

Output Voltage Accuracy

LDO_

= 150mA, relative to V

OUT(NOM)

(Note 3) -1.7 0 +1.7 %

Output Current Range 0 200 mA

Current Limit V

LDO_

= 0V 280 475 750 mA

Soft-Start Current Limit 160 mA

1 2 3 4 5 6 7 8 ... 14 15

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