LM36010 Datasheet, PDF (24/37 Pages) Texas Instruments – Synchronous-Boost, Single-LED Flash Driver With 1.5-A High-Side Current Source

LM36010
SNVSAN4A – APRIL 2017 – REVISED JULY 2017
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8.2.2.3 Input Capacitor Selection
Choosing the correct size and type of input capacitor helps minimize the voltage ripple caused by the switching
of the boost converter and reduces noise on the input pin of the boost converter that can feed through and
disrupt internal analog signals. In the typical application circuit a 10-µF ceramic input capacitor works well. It is
important to place the input capacitor as close as possible to the LM36010 input (IN) pin. This reduces the series
resistance and inductance that can inject noise into the device due to the input switching currents. Table 2 lists
various input capacitors recommended for use with the LM36010.
Table 2. Recommended Input/Output Capacitors (X5R/X7R Dielectric)
MANUFACTURER
TDK Corporation
TDK Corporation
Murata
Murata
PART NUMBER
C1608JB0J106M
C2012JB1A106M
GRM188R60J106M
GRM21BR61A106KE19
VALUE
10 µF
10 µF
10 µF
10 µF
CASE SIZE
0603 (1.6 mm × 0.8 mm × 0.8 mm)
0805 (2 mm × 1.25 mm × 1.25 mm)
0603 (1.6 mm × 0.8 mm × 0.8 mm)
0805 (2 mm × 1.25 mm × 1.25 mm)
VOLTAGE RATING
6.3 V
10 V
6.3 V
10 V
8.2.2.4 Inductor Selection
The LM36010 is designed to use a 0.47-µH or 1-µH inductor. Table 3 lists various inductors and their
manufacturers that work well with the LM36010. When the device is boosting (V_OUT > V_IN) the inductor is typically
the largest area of efficiency loss in the circuit. Therefore, choosing an inductor with the lowest possible series
resistance is important. Additionally, the saturation rating of the inductor must be greater than the maximum
operating peak current of the LM36010. This prevents excess efficiency loss that can occur with inductors that
operate in saturation. For proper inductor operation and circuit performance, ensure that the inductor saturation
and the peak current limit setting of the LM36010 are greater than I_PEAK in Equation 6:
I_PEAK
I_{LED u} V_OUT
K V_IN
'I_L'I_L
V_IN u V_OUT V_IN
2 u f_SW u L u V_OUT
where
• ƒ_SW = 2 or 4 MHz
(6)
Efficiency details can be found in the Application Curves.
MANUFACTURER
TOKO
TOKO
L
0.47 µH
1 µH
Table 3. Recommended Inductors
PART NUMBER
DFE201610P-R470M
DFE201610P-1R0M
DIMENSIONS (L×W×H)
2 mm × 1.6 mm × 1 mm
2 mm × 1.6 mm × 1 mm
I_SAT
4.1 A
3.7 A
R_DC
32 mΩ
58 mΩ
24
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