LTC3831EGN#PBF Linear Technology, LTC3831EGN#PBF Datasheet - Page 17

• Manufacturer Part Number: LTC3831EGN#PBF
• Description: IC SW REG CONTROLLR SYNC 16-SSOP
• Manufacturer: Linear Technology

Specifications of LTC3831EGN#PBF

• Applications: Controller, DDR
• Voltage - Input: 3 ~ 8 V
• Number Of Outputs: 1
• Voltage - Output: 1.27 ~ 4 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Primary Input Voltage: 8V
• No. Of Outputs: 1
• Output Current: 10A
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Supply Voltage Range: 3V To 8V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS INFORMATION
point changes with input voltage, load current variations,
all suggest a more practical empirical method. This can be
done by injecting a transient current at the load and using
an RC network box to iterate toward the fi nal values, or
by obtaining the optimum loop response using a network
analyzer to fi nd the actual loop poles and zeros.
Table 2. Recommended Compensation Network for 2.5V to 1.25V
Applications Using Multiple Paralleled 470μF Sanyo
POSCAP 4TPB470M Output Capacitors
L1 (μH)
1.2
1.2
1.2
2.4
2.4
2.4
4.7
4.7
4.7
C
OUT
1410
2820
4700
1410
2820
4700
1410
2820
4700
4.7μF
C1
C
(μF)
C
R
C
+
GND
R
C
C
120
6.8
1μF
NC
15
22
15
36
47
33
68
SS
(kΩ)
GND
FREQSET
SHDN
COMP
SS
GND
V
Figure 10. Typical Schematic Showing Layout Considerations
CC
LTC3831
100Ω
C
C
3.3
3.3
1.5
3.3
4.7
10
10
22
10
(nF)
PV
PGND
PV
I
CC2
MAX
CC1
TG
I
BG
R
FB
R
FB
+
–
PV
CC
C1(pF)
PGND
33
33
33
33
10
10
10
10
10
1μF
0.1μF
10k
Table 2 shows the suggested compensation component
value for 2.5V to 1.25V applications based on the 470μF
Sanyo POSCAP 4TPB470M output capacitors.
Table 3 shows the suggested compensation component
values for 2.5V to 1.25V applications based on 1500μF
Sanyo MV-WX output capacitors.
Table 3. Recommended Compensation Network for 2.5V to 1.25V
Applications Using Multiple Paralleled 1500μF Sanyo
MV-WX Output Capacitors
L1 (μH)
1.2
1.2
1.2
2.4
2.4
2.4
4.7
4.7
4.7
1k
V
C
IN
OUT
Q1
Q2
4500
6000
9000
4500
6000
9000
4500
6000
9000
PGND
(μF)
OPTIONAL
MBRS340T3
MBRS340T3
R
C
100
150
20
27
43
51
62
82
82
(kΩ)
+
C
IN
L
O
C
0.47
0.47
C
1.5
3.3
(nF)
1
1
1
1
1
+
LTC3831
3830 F11
C
V
OUT
OUT
C1(pF)
120
82
56
56
33
27
33
15
15
17
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