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LP5526 Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LP5526
Description  Lighting Management Unit with High Voltage Boost Converter with up to 150mA Serial FLASH LED Driver
PDF  33 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LP5526 Datasheet(HTML) 9 Page - National Semiconductor (TI)

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Magnetic Boost DC/DC Converter (Continued)
MAGNETIC BOOST DC/DC CONVERTER ELECTRICAL CHARACTERISTICS
Symbol
Parameter
Conditions
Min
Typ
Max
Units
I
LOAD
Maximum Non-Continuous
Load Current
3.0V
≤ V
IN
≤ 3.2V
V
OUT = 20V
140
mA
3.2V < V
IN
V
OUT = 20V
150
I
LOAD
Maximum Continuous Load
Current
3.0V = V
IN
V
OUT = 20V
100
V
OUT
Output Voltage Accuracy
(FB Pin)
3.0V
≤ V
IN
≤ 5.5V
V
OUT = 20V
−2.3
-1.7
+2.3
+1.7
%
RDS
ON
Switch ON Resistance
I
SW = 0.5A
0.15
0.3
Ω
f
PWM
PWM Mode Switching
Frequency
RT =82k
Ω
1.0
MHz
Frequency Accuracy
RT = 82 k
Ω
−7
+7
%
−9
+9
t
PULSE
Switch Pulse Minimum
Width
no load
45
ns
t
STARTUP
Startup Time
Boost startup from STANDBY to V
OUT
= 20V, no load
15
ms
I
MAX
SW Pin Current Limit
1500
1850
mA
Note: Maximum non-continuous currents rates as short pulses (t < 1s). Exposure to maximum rating conditions for extended periods may affect device reliability.
BOOST STANDBY MODE
User can set the Boost Converter to STANDBY mode by
writing the register bit EN_BOOST low. When EN_BOOST is
written high, the converter starts for 20ms in low current
PWM mode and then goes to normal PWM mode. All LED
outputs are off during the 20ms delay to ensure smooth
startup.
BOOST OUTPUT VOLTAGE CONTROL
User can control the boost output voltage by Boost Output
8-bit register.
Boost Output [7:0]
Register 0DH
Boost Output
Voltage (typical)
Bin
Dec
0000 1000
8
8.0V
0000 1001
9
9.0V
0000 1010
10
10.0V
0000 1011
11
11.0V
0000 1100
12
12.0V
0000 1101
13
13.0V
0000 1110
14
14.0V
0000 1111
15
15.0V
0001 0000
16
16.0V
0001 0001
17
17.0V
0001 0010
18
18.0V
0001 0011
19
19.0V
0001 0100
20
20.0V
If register value is lower than 8, then value of 8 is used
internally.
If register value is higher than 20, then value of 20 is used
internally.
Boost Output Voltage Control
20179778
www.national.com
9



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