Datasheet

LTC3220/LTC3220-1
3
32201fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, DV
CC
= 3V, RST = high, C1 = C2 = C3 = 2.2μF, C4 = 4.7μF,
unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Shutdown Current
l
3.2 7 μA
DV
CC
Shutdown Current
l
1μA
Universal LED Current, 6-Bit Linear DACs, ULED = 1V
Full-Scale LED Current
l
18 20 22 mA
Minimum (I
LSB
) LED Current Step 0.314 mA
Minimum Programmable Current ULED Data Register Programmed to
0b00000001
0.395 mA
LED Current Matching Any Two Outputs, 50% of FS 1.5 %
LED Dropout Voltage I
LED
= FS 120 mV
Blink Rate Period REG19, D4 = 0
REG19, D4 = 1
1.25
2.5
Sec
Sec
ULED Up/Down Gradation Ramp Times REG19, D1 = 1, D2 = 0
REG19, D1 = 0, D2 = 1
REG19, D1 = 1, D2 = 1
0.24
0.48
0.96
Sec
Sec
Sec
Gradation Period REG19, D1 = 1, D2 = 0
REG19, D1 = 0, D2 = 1
REG19, D1 = 1, D2 = 1
0.313
0.625
1.25
0.410
0.820
1.640
Sec
Sec
Sec
V
OL
General Purpose Output Mode (GPO) I
OUT
= 1mA, Single Output Enabled 5 mV
LED Turn-On Delay From Stop Bit, Part Enabled 4 μs
Charge Pump (CPO)
1x Mode Output Impedance 0.6 Ω
1.5x Mode Output Impedance V
IN
= 3V, V
CPO
= 4.2V (Note 5) 3.6 Ω
2x Mode Output Impedance V
IN
= 3V, V
CPO
= 4.8V (Note 5) 4.1 Ω
CPO Regulation Voltage 1.5x Mode, I
CPO
= 20mA
2x Mode, I
CPO
= 20mA
4.5
5.03
V
V
Clock Frequency
l
0.65 0.85 1.05 MHz
CPO Short-Circuit Detection
Threshold Voltage
l
0.4 1.3 V
Test Current CPO = 0V
l
10 30 mA
SDA, SCL, RST
V
IL
l
0.3 • DV
CC
V
V
IH
l
0.7 • DV
CC
V
I
IH
SDA, SCL, RST = DV
CC
l
–1 1 μA
I
IL
SDA, SCL, RST = 0V
l
–1 1 μA
V
OL
Digital Output Low (SDA) I
PULLUP
= 3mA
l
0.12 0.4 V
RST Timing Reset Pulse Duration 20 ns
Serial Port Timing (Notes 6, 7)
f
SCL
Clock Operating Frequency 400 kHz
t
BUF
Bus Free Time Between Stop and Start
Condition
1.3 μs
t
HD,STA
Hold Time After (Repeated) Start Condition 0.6 μs
t
SU,STA
Repeated Start Condition Setup Time 0.6 μs
t
SU,STO
Stop Condition Setup Time 0.6 μs