LTC3205

3

3205f

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2: The LTC3205E is guaranteed to meet performance specifications

from 0

°C to 70°C. Specifications over the –40°C to 85°C operating

temperature range are assured by design, characterization and correlation

with statistical process controls.

TYPICAL PERFOR A CE CHARACTERISTICS

Note 4: Based on long term current density limitations.

INPUT VOLTAGE (V)

3.0

60

80

100

3205 TA01b

40

20

50

70

90

30

10

0

3.6

3.9

3.3

4.2

FOUR LEDs AT 15mA/LED

4-LED Main Panel Efficiency

vs Input Voltage

LED Pin Sink Current

vs LED Pin Voltage

3mA/DIV

(100%

SETTING)

AC COUPLED

(20mV/DIV)

AC COUPLED

(50mV/DIV)

Input and Output

Charge Pump Noise

200mV/DIV

3205 G01

500ns/DIV

3205 G02

0mA

SYMBOL PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Charge Pump (CPO)

1:1 Mode Output Impedance

0.8

Ω

2:3 Mode Output Impedance

2.5

Ω

CPO Regulation Voltage

4.7

V

CLK Frequency

0.6

0.8

1.1

MHz

Low Level Input Voltage

q

V

High Level Input Voltage

q

V

Input Current

q

–1

1

µA

Input Current

q

–1

1

µA

Serial Port Timing

35

ns

35

ns

SCLK Low Time

35

ns

SCLK High Time

35

ns

LD Pulse Width

35

ns

SCLK to LD

35

ns

LD to SCLK

0ns