LM3556

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SNVS796D – AUGUST 2011 – REVISED OCTOBER 2015

6.5 Electrical Characteristics

Unless otherwise specified, VIN = 3.6 V, typical limits apply for TA = 25°C, and minimum (MIN) and maximum (MAX) limits

apply over the full operating ambient temperature range (

−40°C ≤ TA ≤ +85°C).

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT SOURCE SPECIFICATIONS

1.425

1.575

1.5-A Flash, VOUT = 4 V

1.5

A

(–5%)

(+5%)

ILED

Current source accuracy

46.88-mA Torch, VOUT = 3.6 V

42.3 (

−10%)

47

51.7 (+10%)

mA

ILED = 1.5 A

Flash

250

280 (+12%)

Current source regulation

VHR

mV

voltage

ILED = 46.88 mA

Torch

150

172.5 (+15%)

ON Threshold

4.86

5

5.1

Output overvoltage protection

VOVP

V

trip point

OFF Threshold

4.75

4.88

4.99

STEP-UP DC-DC CONVERTER SPECIFICATIONS

RPMOS

PMOS switch on-resistance

IPMOS = 1 A

85

m

Ω

RNMOS

NMOS switch on-resistance

INMOS = 1 A

65

−12%

1.7

12%

−12%

1.9

12%

ICL

Switch current limit

A

−10%

2.5

10%

−12%

3.1

12%

NTC comparator trip

VTRIP

Configuration Register, bit [1] = 1

−6%

600

6%

mV

threshold

Undervoltage lockout

UVLO

Falling VIN

2.74

2.8

2.85

V

threshold

INTC

NTC current

−6%

75

6%

µA

Input voltage flash monitor

VIVFM

–3.2%

2.9

3.2%

V

trip threshold

ƒSW

Switching frequency

2.5 V

≤ VIN ≤ 5.5 V

3.72

4

4.28

MHz

IQ

Quiescent supply current

Device not switching Pass Mode

0.6

0.75

mA

Device disabled, EN = 0V

ISD

Shutdown supply current

0.1

1.3

µA

2.5 V

≤ VIN ≤ 5.5 V

Device disabled, EN = 2 V

ISB

Standby supply current

2.5

4

µA

2.5 V

≤ VIN ≤ 5.5 V

Flash-to-torch LED current

TX low to high,

tTX

4

µs

settling time

ILED = 1.5 A to 46.88 mA

ILED overshoot in external

IOS

0 mA to ITORCH

8%

indicator mode

ENABLE, STROBE, TORCH, TX VOLTAGE SPECIFICATIONS

VIL

Input logic low

0

0.4

2.5 V

≤ VIN ≤ 5.5 V

V

VIH

Input logic high

1.2

VIN

I2C-COMPATIBLE INTERFACE SPECIFICATIONS (SCL, SDA)

VIL

Input logic low

0

0.4

2.5 V

≤ VIN ≤ 4.2 V

V

VIH

Input logic high

1.2

VIN

VOL

Output logic low

ILOAD = 3 mA

400

mV

(1)

Minimum and maximum limits are specified by design, test, or statistical analysis. Typical 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.

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