LTC3857IUH#PBF Linear Technology, LTC3857IUH#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC3857IUH#PBF
• Description: IC CTRLR STP-DN SYNC DUAL 32QFN
• Manufacturer: Linear Technology
• Series: PolyPhase®r
• Type: Step-Down (Buck)r

Specifications of LTC3857IUH#PBF

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 24 V
• Frequency - Switching: 50kHz ~ 900kHz
• Voltage - Input: 4 ~ 38 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

LTC3857
FUNCTIONAL DIAGRAM
10
PLLIN/MODE
PGOOD1
PGOOD2
EXTV
FREQ
= POWER GROUND
= SIGNAL GROUND
I
V
LIM
27
14
28
22
20
2
5
IN
4.7V
CC
+
–
20μA
100k
EN
5.1V
LDO
33
+
–
+
–
+
–
+
–
SGND
0.88V
0.72V
0.88V
0.72V
V
V
SYNC
FB1
FB2
DET
CURRENT
LIMIT
EN
5.1V
C
LDO
19
LP
PHASMD
VCO
INTV
3
CC
CLK1
CLKOUT
CLK2
PFD
4
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
RUN
7, 8
11V
0.5μA
0.55V
2.7V
SLOPE COMP
ICMP
2(V
SHDN
RST
FB
S
R
0.425V
)
–
+
–
Q
Q
+
FOLDBACK
DROP
OUT
DET
+
–
+ –
3mV
TOP ON
SHDN
SLEEP
BOT
+
–
OV
IR
SWITCH
SHDN
LOGIC
EA
–
–
+
+
0.80V
TRACK/SS
0.88V
TOP
BOT
INTV
1μA
CC
TRACK/SS
SENSE
SENSE
BOOST
25, 16
24, 17
23, 18
29, 13
26, 15
PGND
32, 10
31, 11
30, 12
SW
1, 9
V
TG
BG
I
21
TH
FB
+
–
INTV
R
CC
A
C
C
C
D
C
C2
SS
R
C
B
B
B
V
L
IN
R
C
D
R
SENSE
C
IN
3857fc