Texas Instruments LM3549 Evaluation Board LM3549SQEV/NOPB LM3549SQEV/NOPB Datenbogen
Produktcode
LM3549SQEV/NOPB
SNVS640A – AUGUST 2010 – REVISED MAY 2013
Electrical Characteristics
(continued)
Limits in standard type face are for T
A
= 25°C. Limits in boldface type apply over the full operating ambient temperature
range (
−
30°C
≤
T
A
≤
+85°C). Unless otherwise noted, specifications apply to
with: V
IN
= 3.6V, C
IN
= 10 µF, C
OUT
=
4.7µF and L1 = 2.2 µH.
Parameter
Test Conditions
Min
Typ
Max
Units
Drivers (R_OUT, G_OUT, B_OUT)
I
OUT MIN
Minimum output current
97
107
118
mA
I
OUT MAX
Maximum output current
690
705
720
mA
I
LIM
Current limit
15
%
R
OUT
Driver on resistance
I
OUT
= 500 mA
0.2
Ω
Driver System Characteristics
I
OUT
Current accuracy
After settling, 500 mA (ISET = 276h)
−
6
±1
+6
%
t
r
Current rise time
50
µs
t
f
Current fall time
50
µs
I
STEP
Current step
0.64
mA
Buck or Boost Converter
Positive current limit range
Programmable
500
2000
mA
Positive current limit accuracy
Set to 1000 mA
-20
+20
%
Negative current limit range
Programmable
550
2200
mA
Negative current limit
Set to 550 mA
-20
+20
%
accuracy
V
OUT MAX
Maximum output voltage
4.6
V
f
SW
Switching frequency
2.25
2.4
2.55
MHz
r
DSON P1S
P1 on resistance in buck
100
m
Ω
mode (small)
r
DSON P1L
P1 on resistance in boost
55
m
Ω
mode (large)
r
DSON N1
N1 on resistance
160
m
Ω
r
DSON N3
N3 on resistance in buck
VOUT = 0.8V
70
m
Ω
mode
r
DSON P2
P2 on resistance in boost
VOUT = 3.6V
65
m
Ω
mode
r
DSON N2
N2 on resistance
150
m
Ω
PWM Input (Global brightness control)
f
PWM
PWM frequency
7-bit resolution
4
20
kHz
8-bit resolution
4
10
9-bit resolution
4
5
t
TO
Timeout
For PWM zero
260
300
340
µs
t
ON
Minimum on time
1
µs
t
OFF
Minimum off time
1
µs
Logic Input EN
VIL
Logic input low level
0.5
V
VIH
Logic input high level
1.2
V
Logic Inputs SDA, SCL, R_EN, G_EN, B_EN, PWM
VIL
Logic input low level
VEN = 1.65 to VDD
0.2* VEN
V
VIH
Logic input high level
VEN = 1.65 to VDD
0.8* VEN
V
Logic Outputs SDA, FAULT
VOL
Output low level
I
OUT
= 3 mA
0.5
V
4
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