LTC3865EFE#TRPBF Linear Technology, LTC3865EFE#TRPBF Datasheet - Page 33

• Manufacturer Part Number: LTC3865EFE#TRPBF
• Description: IC BUCK SYNC ADJ DUAL 38TSSOP
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC3865EFE#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.6 ~ 5 V
• Frequency - Switching: 250kHz ~ 770kHz
• Voltage - Input: 4.5 ~ 38 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 38-TSSOP Exposed Pad, 38-eTSSOP, 38-HTSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

APPLICATIONS INFORMATION
A short-circuit to ground will result in a folded back cur-
rent of:
with a typical value of R
= 0.1. The resulting power dissipated in the bottom
MOSFET is:
which is less than under full-load conditions.
TYPICAL APPLICATIONS
V
I
P
SC
OUT1
1.5V
SYNC
15A
=
(
D1, D2: VISHAY B340A
L1, L2: VISHAY IHLP4040DZERR47M11
C
C
1 3 50
=
=
OUT1
OUT2
0 008
2mΩ
/
48
20
0.47μH
.
C
100μF
OUT1
, C
, C
L2
)
m
V
OUT4
OUT3
D1
20
W W
– .
Ω
mV
C
: TDK C322JX5R0J107MT
, C
V
3 3
OUT2,3
OUT5
RJK0305DPB
RJK0330DPB
–
V
, C
+
2
1
(
OUT6
1 8
⎛
⎝ ⎜
DS(ON)
.
90
: SANYO 4TPE 220μF
Q1
Q2
A
3 3
ns
) (
.
2
Figure 16. 1.5V/15A, 1.2V/15A Converter Using Sense Resistors
10k
(
1000pF
μ
and δ = (0.005/°C)(20)
4.7μF
20
1 125 0 016
H
.
0.1μF
1000pF
V
100Ω
100Ω
100pF
)
⎞
⎠ ⎟
)
=
(
10μF
35V
1 1 8 . A
.
D3
Ω
SW1
MODE/PLLIN
I
RUN1
VID11
VID12
TG1
BOOST1
BG1
SENSE1
SENSE1
V
I
LIM
TH1
TK/SS1
V
OSENSE1
)
IN
2.2Ω
PGOOD
0.1μF
+
–
LTC3865
1μF
SGND
EXTV
0.1μF
CC
V
C
temperature assuming only channel 1 or 2 is on. C
chosen with an ESR of 0.02Ω for low output ripple. The
output ripple in continuous mode will be highest at the
maximum input voltage. The output voltage ripple due to
ESR is approximately:
SENSE2
SENSE2
BOOST2
OSENSE2
TK/SS2
INTV
IN
VID21
VID22
PGND
RUN2
FREQ
V
SW2
BG2
I
TG2
TH2
is chosen for an RMS current rating of at least 2A at
ORIPPLE
CC
+
–
= R
162k
1%
D4
0.1μF
10μF
35V
ESR
LTC3865/LTC3865-1
1000pF
100Ω
100Ω
15k
1000pF
(ΔI
L
) = 0.02Ω(1.5A) = 30mV
100pF
Q3
RJK0305DPB
Q4
RJK0330DPB
C
+
OUT5,6
22μF
50V
+
V
4.5V TO 24V
IN
D2
0.47μH
L2
2mΩ
3865 F16
P-P
C
100μF
33
V
1.2V
15A
OUT4
OUT2
OUT
3865fb
is