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LM3648, LM3648TT

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SNVSA68D – OCTOBER 2014 – REVISED NOVEMBER 2016

Product Folder Links: LM3648 LM3648TT

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Copyright © 2014–2016, Texas Instruments Incorporated

(1)

Minimum (MIN) and Maximum (MAX) limits are specified by design, test, or statistical analysis. Typical (TYP) numbers are not verified,

but do represent the most likely norm. Unless otherwise specified, conditions for typical specifications are: VIN = 3.6 V and TA = 25°C.

(2)

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

6.5 Electrical Characteristics

Typical limits tested at TA = 25°C. Minimum and maximum limits apply over the full operating ambient temperature range

(

−40°C ≤ TA ≤ +85°C). Unless otherwise specified, VIN = 3.6 V, HWEN = VIN.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT SOURCE SPECIFICATIONS

ILED

Current source accuracy

VOUT = 4 V, flash code = 0x3F = 1.5 A

flash

–7%

1.5

7%

A

VOUT = 4 V, torch code = 0x3F = 178.6 mA

torch

–10%

178.6

10%

mA

ILED

Current source accuracy

(LM3648TT)

VOUT = 4 V, torch code = 0x3F = 357.2 mA

torch

–10%

357.2

10%

mA

VHR

LED current source regulation

voltage

ILED = 1.5 A

Flash

290

mV

ILED = 178.6 mA

Torch

158

VHR

LED current source regulation

voltage (LM3648TT)

ILED = 357.2 mA

Torch and

flash

270

mV

VOVP

ON threshold

4.86

5

5.1

V

OFF threshold

4.75

4.88

4.99

STEP-UP DC-DC CONVERTER SPECIFICATIONS

RPMOS

PMOS switch on-resistance

86

m

Ω

RNMOS

NMOS switch on-resistance

65

ICL

Switch current limit

Reg 0x07, bit[0] = 0

–12%

1.9

12%

A

Reg 0x07, bit[0] = 1

–12%

2.8

12%

VUVLO

Undervoltage lockout threshold

Falling VIN

–2%

2.5

2%

V

VTRIP

NTC comparator trip threshold

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

–5%

0.6

5%

V

INTC

NTC current

–6%

50

6%

µA

VIVFM

Input voltage flash monitor trip

threshold

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

–3%

2.9

3%

V

IQ

Quiescent supply current

Device not switching pass mode

0.3

0.75

mA

ISD

Shutdown supply current

Device disabled, HWEN = 0 V

2.5 V

≤ VIN ≤ 5.5 V

0.1

4

µA

ISB

Standby supply current

Device disabled, HWEN = 1.8 V

2.5 V

≤ VIN ≤ 5.5 V

2.5

10

µA

HWEN, TORCH/TEMP, STROBE, TX VOLTAGE SPECIFICATIONS

VIL

Input logic low

2.5 V

≤ VIN ≤ 5.5 V

0

0.4

V

VIH

Input logic high

1.2

VIN

V

I2C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)

VIL

Input logic low

2.5 V

≤ VIN ≤ 4.2 V

0

0.4

V

VIH

Input logic high

1.2

VIN

VOL

Output logic low

ILOAD = 3 mA

400

mV

6.6 Timing Requirements

MIN

NOM

MAX

UNIT

t1

SCL clock period

2.4

µs

t2

Data in set-up time to SCL high

100

ns

t3

Data out stable After SCL low

0

ns

t4

SDA low set-up time to SCL low (start)

100

ns

t5

SDA high hold time after SCL high (stop)

100

ns