LP3933SL NSC [National Semiconductor], LP3933SL Datasheet - Page 9

• Manufacturer Part Number: LP3933SL
• Description: Lighting Management System for Six White LEDs and Two RGB or FLASH LEDs
• Manufacturer: NSC [National Semiconductor]

I
V
RDS
f
t
I
LOAD
PWF
STARTUP
CL_OUT
Magnetic Boost DC/DC Converter
Magnetic Boost DC/DC Converter Electrical Characteristics
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 10 ms in PFM mode and then goes to PWM mode.
FB
Symbol
ON
Load Current
Output Voltage
Accuracy (FB Pin)
Voltage at FB Pin
(Boost Converter
Output Voltage)
Switch ON Resistance
PWM Mode Switching
Frequency
Frequency Accuracy
Startup Time
SW Pin Current Limit
Parameter
3.0V ≤ V
V
1 mA ≤ I
3.0V ≤ V
V
V
1 mA ≤ I
3.0V
V
1 mA ≤ I
V
V
0.5A
RT = 82 kΩ
2.65 ≤ V
RT = 82 kΩ
OUT
OUT
OUT
(SCHOTTKY)
IN
DD1, 2
>
<
= 5V
− 0.5V
= 5V
Conditions
5V + V
Boost Converter Topology
V
= 2.775V, I
DD1, 2
IN
LOAD
IN
LOAD
LOAD
IN
≤ 4.5V
≤
<
(SCHOTTKY)
≤ 300 mA
≤ 300 mA
≤ 300 mA
5V +
≤ 2.9
(Continued)
SW
9
=
Min
670
530
−5
−6
−9
0
V
IN
–V
(SCHOTTKY)
Typ
800
0.4
±
25
5
1
3
20080528
Max
300
915
995
0.7
+5
+6
+9
www.national.com
Units
MHz
mA
mA
ms
%
%
V
V
Ω