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Electrical characteristics (continued) – Rainbow Electronics MAX8645Y User Manual

Page 3

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MAX8645X/MAX8645Y

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

LDOs in 4mm x 4mm TQFN

_______________________________________________________________________________________

3

ELECTRICAL CHARACTERISTICS (continued)

(V

IN

= 3.6V, V

GND

= V

PGND

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

SETM

= R

SETF

= 6.8k

Ω, P1 = P2 = unconnected, C

REF

= 0.01µF,

T

A

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

A

= +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

V

IN

≥ 3.15V, V

OUT

= 3.9V

580

mA

1x mode (V

IN

- V

OUT

) / I

OUT

0.3

1.0

1.5x mode (1.5V

IN

- V

OUT

) / I

OUT

1.1

4.0

Open-Loop OUT Resistance

2x mode (2V

IN

- V

OUT

) / I

OUT

1.5

4.14

Ω

Charge-Pump Short-Circuit
Current

V

OUT

< 1.25V

500

mA

Switching Frequency

1

MHz

OUT Pulldown Resistance in
Shutdown

ENM_ = ENF = GND

5

k

Ω

LED DRIVER

SET_ Bias Voltage

T

A

= +25°C

0.6

V

T

A

= +25°C

0.01

1

SET_ Leakage in Shutdown

ENM_ = ENF = GND

T

A

= +85°C

0.1

µA

SET_ Current Range

10

145

µA

SETM-to-Main LED Current Ratio
(I

M_

/I

SETM

)

100% setting, M1–M6

230

A/A

SETF-to-Flash LED Current Ratio
(I

F_

/I

SETF

)

100% setting, F1 and F2

1380

A/A

T

A

= +25°C

-1.25

+1.25

M_, F_ Current Accuracy

T

A

= -40°C to current derating start temperature

-4

+4

%

Maximum Main LED Sink Current

R

SETM

= 4.6k

Ω, for each M_

30

mA

Maximum Flash LED Sink Current

R

SETF

= 4.12k

Ω, I

F1

+ I

F2

400

mA

Current-Derating-Function Start
Temperature

+40

°C

Current-Derating-Function Slope

T

A

= +40°C to +85°C

-1.7

%/°C

Dropout Voltage

(Note 2)

40

90

mV

1.5x and 2x Regulation Voltage

150

mV

T

A

= +25°C

0.01

2

M_, F_ Leakage in Shutdown

ENM_ = ENF = GND

T

A

= +85°C

0.1

µA

LDO_

Output Voltage Accuracy

I

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