LM3642

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SNVS891H – SEPTEMBER 2012 – REVISED SEPTEMBER 2015

6.5 Electrical Characteristics

MIN and MAX limits apply over the full operating ambient temperature range (

−40°C ≤ TA ≤ 85°C). Unless otherwise

specified, TA = 25°C, VIN = 3.6 V.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT SOURCE SPECIFICATIONS

1-A flash, VOUT = 4 V

–6%

1.04

6%

A

1.5-A flash, VOUT = 4 V

–8%

1.5

8%

A

ILED

Current source accuracy

24-mA torch, VOUT = 4 V

–10%

24

10%

mA

(LM3642-LT)

48.4 mA Torch, VOUT = 4 V

–10%

48.4

10%

mA

ILED = 1.5 A

Flash

275

12%

Current source regulation

VHR

mV

voltage

ILED = 24 mA/48.4 mA

Torch

150

15%

ON threshold

–2.8%

5

2.2%

Output overvoltage protection

VOVP

V

trip point

OFF threshold

–2.7%

4.88

2.3%

STEP-UP DC-DC CONVERTER SPECIFICATIONS

RPMOS

PMOS switch on-resistance

IPMOS = 1 A

120

m

Ω

RNMOS

NMOS switch on-resistance

INMOS = 1 A

90

–17%

1.6

15%

ICL

Input current limit

A

–17%

1.88

15%

Input voltage flash monitor trip

VIVFM

–3.2%

2.9

3.2%

V

threshold

UVLO

Undervoltage threhold

Falling VIN

–4%

2.8

4%

V

ƒSW

Switching frequency

–9%

4

9%

MHz

IQ

Quiescent supply current

Device not switching pass mode

0.75

mA

ISB

Standby supply current

Device disabled 2.5 V

≤ VIN ≤ 5.5 V

1.6

4

µA

Flash-to-torch LED current

TX low to high

tTX

4

µs

settling time

ILED = 1.5 A to 24 mA/48.4 mA

STROBE, TX VOLTAGE SPECIFICATIONS

VIL

Input logic low

2.5 V

≤ VIN ≤ 5.5 V

0

0.4

V

VIH

Input logic high

2.5 V

≤ VIN ≤ 5.5 V

1.2

VIN

I2C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)

VIL

Input logic low

2.5 V

≤ VIN ≤ 5.5 V

0

0.4

V

VIH

Input logic high

2.5 V

≤ VIN ≤ 4.2 V

1.2

VIN

VOL

Output logic low

ILOAD = 3 mA

400

mV

(1)

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

(2)

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.

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