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L6986H Datasheet(PDF) 50 Page - STMicroelectronics

Part # L6986H
Description  38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current
PDF  68 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986H Datasheet(HTML) 50 Page - STMicroelectronics

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For example with VOUT = 3.3 V, VIN = 12 V, fSW = 500 kHz, ΔIL = 0.6 A, (resulting by the inductor value) and COUT
= 20 µF MLCC :
ΔVOUTVOUT≅ 1VOUT⋅ ΔILMAX
COUT⋅fSW=(13.3⋅ 0.6
8⋅20μF⋅500kHz)=7.5mV3.3=0.23%
(53)
The output capacitor value has a key role to sustain the output voltage during a steep load transient. When the
load transient slew rate exceeds the system bandwidth, the output capacitor provides the current to the load. In
case the final application specifies high slew rate load transient, the system bandwidth must be maximized and
the output capacitor has to sustain the output voltage for time response shorter than the loop response time.
In Table 17. Output capacitors some capacitor series are listed.
Table 17. Output capacitors
Manufacturer
Series
Cap value (μF)
Rated voltage (V)
ESR (mΩ)
MURATA
GRM32
22 to 100
6.3 to 25
<5
GRM31
10 to 47
6.3 to 25
<5
PANASONIC
ECJ
10 to 22
6.3
<5
EEFCD
10 to 68
6.3
15 to 55
SANYO
TPA/B/C
100 to 470
4 to 16
40 to 80
TDK
C3225
22 to 100
6.3
<5
6.7
Application board
The reference evaluation board schematic is shown in the figure below.
Figure 52. Evaluation board schematic
signal GND
power GND
10V
size 0805
size XAL5030 Coilcraft
L1A
NM
+
J5
R4
0
R11
NM
TP3
SYNCH
C8
330p
J3
L1
10uH
TP8
VIN_EMI
R10
NM
+
C6
10nF
R2
NM
C4
2.2p
R6
1M
TP7
GND
J2
TP2
RST
R3
NM
R9
82k
TP1
SS/INH
C11
NM
R5
NM
R7
240k
R1
0
C7
NM
J1
TP6
GND
U1
L6986H
RST
1
VCC
2
SS/INH
3
SYNCH
4
FSW
5
MLF
6
COMP
7
DELAY
8
FB
9
SGND
10
PGND
11
PGND
12
LX
13
LX
14
VIN
15
VBIAS
16
EP
17
J4
TP4
VOUT
L3
MPZ2012S221A
C5
68nF
L2
4.7uH
C3
470nF
R8
75k
TP5
VIN
VIN_FLT
PGND
VIN_FLT
PGND
The additional input filter (C16, L3, C15, L2, C14) limits the conducted emission on the power supply (refer to
HTSSOP16 package information).
L6986H
Application board
DS12905 - Rev 2
page 50/68



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