LM3559 datasheet(5/50 Pages) TI1

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LM3559

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SNVS624B – JUNE 2011 – REVISED JUNE 2016

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(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 represent the

most likely norm. Unless otherwise stated, conditions for typical specifications are: VIN = 3.6 V and TA = 25°C.

(3)

The typical curve for overvoltage protection (OVP) is measured in closed loop using Figure 43 . The OVP value is found by forcing an

open circuit in the LED1 and LED2 path and recording the peak value of VOUT. The value given in Electrical Characteristics is found in

an open loop configuration by ramping the voltage at OUT until the OVP comparator trips. The closed loop data can appear higher due

to the stored energy in the inductor being dumped into the output capacitor after the OVP comparator trips. Worst case is an open circuit

condition where the output voltage can continue to rise after the OVP comparator trips by approximately IIN × sqrt(L/COUT).

(4)

The typical curve for current limit is measured in closed loop using Figure 43, and increasing IOUT until the peak inductor current stops

increasing. The value given in Electrical Characteristics is measured open loop and is found by forcing current into SW until the current

limit comparator threshold is reached. Closed loop data appears higher due to the delay between the comparator trip point and the

NFET turning off. This delay allows the closed loop inductor current to ramp higher after the trip point by approximately 20 ns × VIN/L.

6.5 Electrical Characteristics

Unless otherwise specified, VIN = 3.6 V, VHWEN = VIN, TA = 25°C.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

CURRENT SOURCE SPECIFICATIONS

ILED

Current source

accuracy

ILED1 + ILED2, 3 V

≤ VIN ≤ 4.2 V,

VOUT = 4.5 V

900-mA flash current setting, per

current source

–7%

1800

900-mA flash current setting, per

current source

–40°C

≤ TA ≤ 85°C

–4%

1800

28.125-mA torch current, per

current source

–10%

56.2

10%

28.125-mA torch current, per

current source

–40°C

≤ TA ≤ 85°C

VOUT – VLED1/2

Current source

regulation voltage

ILED = 1.8 A (ILED1 + ILED2), VOUT = 4.5 V

270

VOVP

Output overvoltage

protection trip point(3)

ON threshold

ON threshold, –40°C

≤ TA ≤ 85°C

4.925

5.075

OFF threshold

4.88

STEP-UP DC-DC CONVERTER SPECIFICATIONS

RPMOS

PMOS switch on-

resistance

IPMOS = 1A

Ω

RNMOS

NMOS switch on-

resistance

INMOS = 1A

Ω

ICL

Switch current limit(4)

3 V

≤ VIN ≤ 4.2 V

Flash Duration

[6:5] = 00

1.4

3 V

≤ VIN ≤ 4.2 V

–40°C

≤ TA ≤ 85°C

1.2

1.6

3 V

≤ VIN ≤ 4.2 V

Flash Duration

[6:5] = 01

2.1

3 V

≤ VIN ≤ 4.2 V

–40°C

≤ TA ≤ 85°C

1.8

2.3

3 V

≤ VIN ≤ 4.2 V

Flash Duration

[6:5] = 10

2.7

3 V

≤ VIN ≤ 4.2 V

–40°C

≤ TA ≤ 85°C

2.4

3 V

≤ VIN ≤ 4.2 V

Flash Duration

[6:5] = 11

3.2

3 V

≤ VIN ≤ 4.2 V

–40°C

≤ TA ≤ 85°C

2.9

3.5

IOUT_SC

Output short-circuit

current limit

VOUT < 2.3 V

350

ILEDI/NTC

Indicator current

≤ VIN ≤ 4.2 V

VLEDI/NTC = 2 V, –40°C ≤ TA ≤ 85°C

≤ VIN ≤ 4.2 V

VLEDI/NTC = 2 V

VTRIP

Comparator trip

threshold

Configuration register 1, bit [4] = 1,

3 V

≤ VIN ≤ 4.2 V

Configuration register 1, bit [4] = 1,

3 V

≤ VIN ≤ 4.2 V, –40°C ≤ TA ≤ 85°C

0.97

1.03

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