LTC3728LEUH#TRPBF Linear Technology, LTC3728LEUH#TRPBF Datasheet - Page 11

• Manufacturer Part Number: LTC3728LEUH#TRPBF
• Description: IC REG SW DUAL 2PH STPDWN 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3728LEUH#TRPBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 3A
• Frequency - Switching: 250kHz ~ 550kHz
• Voltage - Input: 4.5 ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -

FUNCTIONAL DIAGRAM
R6
R5
V
INTV
F
IN
+
IN
R
C
5V
LP
LP
CC
PLLFLTR
PGOOD
3.3V
EXTV
INTV
PLLIN
SGND (UH PACKAGE PAD)
FCB
V
IN
OUT
50k
CC
CC
0.18μA
3V
OSCILLATOR
4.8V
PHASE DET
+
–
0.8V
4.5V
–
+
–
+
+
–
CLK1
CLK2
INTERNAL
–
+
–
+
–
+
–
+
SUPPLY
V
LDO
REG
5V
REF
0.86V
0.74V
0.86V
0.74V
BINH
FCB
V
V
OSENSE1
OSENSE2
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
1.2μA
6V
4(V
0.86V
FB
SLOPE
COMP
)
I1
S
R
+
–
0.55V
Q
Q
–
DROP
OUT
DET
Figure 2
45k
+
–
+
4(V
SHDN
+
RST
FB
B
3mV
)
BOT
TOP ON
–
SHDN
FCB
START
45k
SOFT
RUN
–
+
OV
2.4V
EA
I2
SWITCH
–
+
+
–
LOGIC
V
FB
0.80V
0.86V
TOP
BOT
INTV
LTC3728L/LTC3728LX
CC
INTV
30k
30k
CC
V
SENSE
SENSE
RUN/SS
BOOST
PGND
OSENSE
SW
TG
BG
I
TH
+
–
INTV
CC
R1
D
C
C
C
B
R2
C2
SS
B
C
C
V
IN
R
C
R
D
SENSE
1
+
C
IN
+
11
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