LTC1628CUH Linear Technology, LTC1628CUH Datasheet - Page 9

• Manufacturer Part Number: LTC1628CUH
• Description: IC SW REG STP-DN 2PHS 32QFN
• Manufacturer: Linear Technology
• Type: Step-Down (Buck)r

Specifications of LTC1628CUH

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: Adj to 0.8V
• Current - Output: 3A
• Frequency - Switching: 220kHz
• Voltage - Input: 3.5 ~ 30 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power - Output: -

FU CTIO AL DIAGRA
PI FU CTIO S
PGOOD: (LTC1628-PG Only) Open-Drain Logic Output.
PGOOD is pulled to ground when the voltage on either
V
OSENSE
R6
R5
V
U
U
IN
V
+
5V
SEC
FREQSET
STBYMD
3.3V
FLTCPL
EXTV
INTV
SGND
FCB
V
IN
pin is not within 7.5% of its set point.
OUT
CC
0.18 A
CC
U
U
3V
MERGE LOGIC
OSCILLATOR
4.8V
+
–
1.19V
4.5V
0.8V
1M
–
+
U
–
+
+
–
CLK1
CLK2
RUN/SS1
RUN/SS2
INTERNAL
SUPPLY
V
LDO
REG
5V
REF
BINH
FCB
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
W
1.2 A
6V
4(V
0.86V
FB
SLOPE
COMP
)
I1
S
R
+
–
0.55V
Q
Q
–
DROP
OUT
DET
45k
Figure 2
–
+
+
4(V
SHDN
+
RST
FB
B
3mV
)
BOT
TOP ON
NC: These “No Connect” pins are not tied internally to
anything. On the PC layout, these pin landings should be
connected to the SGND plane under the IC.
–
SHDN
FCB
START
45k
SOFT
RUN
–
+
OV
2.4V
EA
I2
SWITCH
–
+
+
–
LOGIC
V
FB
0.80V
0.86V
LTC1628/LTC1628-PG
TOP
BOT
INTV
CC
INTV
30k
30k
CC
V
SENSE
SENSE
RUN/SS
BOOST
PGND
OSENSE
SW
I
TG
BG
TH
+
–
INTV
CC
R1
D
C
C
C
B
R2
B
D
C2
SS
C
SEC
C
V
IN
R
C
D
R
1
SENSE
+
C
C
IN
SEC
1628fb
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