LM3644, LM3644TT

www.ti.com

SNVSA52D – AUGUST 2014 – REVISED SEPTEMBER 2015

7.5 Electrical Characteristics

(

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT SOURCE SPECIFICATIONS

–7%

1.5

7%

A

flash

Current source accuracy

–10%

89.3

10%

mA

torch or

Current source accuracy

-10%

180

-10%

mA

(LM3644TT)

torch

Flash

290

LED1 and LED2 current source

mV

regulation voltage

Torch

158

LED1 and LED2 current source

Torch and

270

mV

regulation voltage (LM3644TT)

Flash

ON threshold

4.86

5

5.1

V

OFF threshold

4.75

4.88

4.99

STEP-UP DC/DC CONVERTER SPECIFICATIONS

PMOS switch on-resistance

86

m

Ω

NMOS switch on-resistance

65

m

Ω

Reg 0x07, bit[0] = 0

–12%

1.9

12%

Switch current limit

A

Reg 0x07, bit[0] = 1

–12%

2.8

12%

UVLO

Undervoltage lockout threshold

–2%

2.5

2%

V

NTC comparator trip threshold

Reg 0x09, bits[3:1] = '100'

–5%

0.6

5%

V

NTC current

–6%

50

6%

µA

Input voltage flash monitor trip

Reg 0x02, bits[5:3] = '000'

–3%

2.9

3%

V

threshold

Quiescent supply current

Device not switching pass mode

0.3

0.75

mA

Device disabled, HWEN = 0 V

Shutdown supply current

0.1

4

µA

2.5 V

Device disabled, HWEN = 1.8 V

Standby supply current

2.5

10

µA

2.5 V

HWEN, TORCH/TEMP, STROBE, TX VOLTAGE SPECIFICATIONS

Input logic low

0

0.4

V

2.5 V

Input logic high

1.2

V

Input logic low

0

0.4

V

2.5 V

Input logic high

1.2

V

Output logic low

400

mV

(1)

Minimum (Min) and Maximum (Max) limits are specified by design, test, or statistical analysis. Typical (typ.) numbers are not verified, but

(2)

All voltages are with respect to the potential at the GND pin.

Copyright © 2014–2015, Texas Instruments Incorporated

Submit Documentation Feedback

5

Product Folder Links: LM3644 LM3644TT