LM3528TMEV National Semiconductor, LM3528TMEV Datasheet - Page 28

• Manufacturer Part Number: LM3528TMEV
• Description: BOARD EVAL FOR LM3528 12MCRSMD
• Manufacturer: National Semiconductor

Specifications of LM3528TMEV

• Current - Output / Channel: 20mA
• Outputs And Type: 2, Non-Isolated
• Voltage - Output: 21V
• Features: Dimmable, I²C Interface
• Voltage - Input: 2.5 ~ 5.5V
• Utilized Ic / Part: LM3528
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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TABLE 9. Recommended Schottky Diodes
OUTPUT CURRENT RANGE (OLED MODE)
The maximum output current the LM3528 can deliver in OLED
mode is limited by 4 factors (assuming continuous conduc-
tion); the peak current limit of 770mA (typical), the inductor
value, the input voltage, and the output voltage. Calculate the
maximum output current (I
tion:
For the typical application circuit with V
ing 70% efficiency, the maximum output current at V
will be approximately 70mA. At 4.2V due to the shorter on
times and lower average input currents the maximum output
current (at 70% efficiency) jumps to approximately 105mA.
Figure 11 shows a plot of I
equation, assuming 80% efficiency. In reality, factors such as
current limit and efficiency will vary over V
component selection. This can cause the actual I
be higher or lower.
FIGURE 18. Typical Maximum Output Current in OLED
Manufacturer
Diodes Inc.
Diodes Inc.
Philips
Mode (assumed 80% efficiency)
NSR0230M2T5G
NSR0230P2T5G
OUT_MAX
Part Number
RB521S30T1
OUT_MAX
SDM20U30
B05030WS
BAT760
) using the following equa-
vs. V
OUT
IN
IN
= 18V and assum-
, temperature, and
using the above
30020562
OUT_MAX
IN
SOD-923 (0.8mm×0.6mm×0.4mm)
SOD-523 (1.2mm×0.8mm×0.6mm)
SOD-523 (1.2mm×0.8mm×0.6mm)
SOD-723 (1mm×0.6mm×0.52mm)
SOD-323 (1.6mm×1.2mm×1mm)
SOD-323 (1.6mm×1.2mm×1mm)
= 2.7V
to
28
Package
OUTPUT VOLTAGE RANGE (OLED MODE)
The LM3528's output voltage is constrained by 2 factors. On
the low end it is limited by the minimum duty cycle of 10%
(assuming continuous conduction) and on the high end it is
limited by the over voltage protection threshold (V
(typical). In order to maintain stability when operating at dif-
ferent output voltages the output capacitor and inductor must
be changed. Refer to Table 10 for different V
L combinations.
V
18V
15V
12V
TABLE 10. Component Values for Output Voltage
9V
7V
5V
OUT
2.2µF
2.2µF
4.7µF
10µF
10µF
22µF
C
OUT
Selection
4.7µH
4.7µH
10µH
10µH
10µH
10µH
L
Breakdown
Reverse
Voltage
30V
30V
30V
30V
30V
20V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 5.5V
2.7V to 4.5V
V
IN
OUT
Range
, C
OVP
Average
Current
Rating
200mA
200mA
200mA
200mA
OUT
) of 22V
0.5A
1A
, and