6

LM3697

SNOSCS2D – NOVEMBER 2013 – REVISED MARCH 2019

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Copyright © 2013–2019, Texas Instruments Incorporated

(1)

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

(2)

Minimum and Maximum limits are verified 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.

(3)

LED current sink matching in the high-voltage current sinks (HVLED1 through HVLED3) is given as the maximum matching value

between any two current sinks, where the matching between any two high voltage current sinks (X and Y) is given as (IHVLEDX ( or

IHVLEDY) × IAVE(X-Y))/(IAVE(X-Y)) × 100. In this test all three HVLED current sinks are assigned to Bank A.

6.5 Electrical Characteristics

Limits apply over the full operating ambient temperature range (

−40°C ≤ TA ≤ 85°C) and VIN = 3.6 V, unless otherwise

specified.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ISHDN

Shutdown current

2.7 V

≤ VIN ≤ 5.5 V, HWEN = GND

3

µA

TA = 25°C

1

ILED_MIN

Minimum LED current

Full-scale current = 20.2 mA

Exponential mapping, TA = 25°C

6

µA

TSD

Thermal shutdown

140

°C

Hysteresis

15

BOOST CONVERTER

IHVLED(1/2/3)

Output current regulation

(HVLED1, HVLED2, HVLED3)

Full-scale current= 20.2 mA,

Exponential mapping,

Brightness Code =

maximum

2.7 V

≤ VIN ≤ 5.5 V

18.38

20.2

22.02

mA

Full-scale current= 20.2 mA,

Exponential mapping,

Brightness Code =

maximum

HVLED1 Bank A, HVLED2/3

Bank B

TA = 25°C

–3.4%

±2 %

3.2%

TA = 25°C

3 V

≤ VIN ≤ 4.5 V

–3.6%

3.4%

TA = 25°C

±2 %

IMATCH_HV

HVLED1 to HVLED2 or

HVLED3 matching (3)

Exponential mapping,

auto headroom off,

PWM Off,

HVLED1/2/3 Bank A

2.7 V

≤ VIN ≤ 5.5 V

ILED = 20.2 mA

−2.5%

2.5%

TA = 25°C

ILED = 20.2 mA

–2%

1.7%

2.7 V

≤ VIN ≤ 5.5 V

ILED = 500 µA

–8.5%

8.5%

VREG_CS

Regulated current sink

headroom voltage

Auto-headroom off, TA = 25°C

400

mV

VHR_MIN

Minimum current sink

headroom voltage for HVLED

current sinks

ILED = 95% of nominal, Full-scale current = 20.2 mA

275

mV

ILED = 95% of nominal, Full-scale current =

20.2 mA , TA = 25°C

190

RDSON

NMOS switch on resistance

ISW = 500 mA, TA = 25°C

0.3

Ω

ICL_BOOST

NMOS switch current limit

880

1120

mA

TA = 25°C

1000

VOVP

Output overvoltage protection

ON Threshold

OVP select bits = 11

2.7 V

≤ VIN ≤ 5.5 V

38.75

41.1

V

TA = 25°C

40

Hysteresis

TA = 25°C

1

ƒSW

Switching frequency

Boost frequency select bit =

0

2.7 V

≤ VIN ≤ 5.5 V

450

550

kHz

TA = 25°C

500

Boost frequency select bit =

1

2.7 V

≤ VIN ≤ 5.5 V

900

1100

TA = 25°C

1000

DMAX

Maximum duty cycle

TA = 25°C

94%

HWEN INPUT

VHWEN_L

Logic low

2.7 V

≤ VIN ≤ 5.5 V

0

0.4

V

VHWEN_H

Logic high

2.7 V

≤ VIN ≤ 5.5 V

1.2

VIN