LTC3857IUH#TRPBF Linear Technology, LTC3857IUH#TRPBF Datasheet - Page 2

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

Specifications of LTC3857IUH#TRPBF

• 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
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (V
Topside Driver Voltages
Switch Voltage (SW1, SW2) ........................ –5V to 40V
PLLIN/MODE, (BOOST1-SW1), (BOOST2-SW2),
INTV
RUN1, RUN2 ................................................ –0.3V to 8V
SENSE1
SENSE2
FREQ Voltages ..................................... –0.3V to INTV
I
EXTV
I
PGOOD1, PGOOD2 Voltages ....................... –0.3V to 6V
TRACK/SS1, TRACK/SS2 Voltages .............. –0.3V to 6V
Operating Junction Temperature Range
(Note 2) .................................................. –40°C to 125°C
Maximum Junction Temperature (Note 3) ............ 125°C
Storage Temperature Range ................... –65°C to 150°C
ORDER INFORMATION
LEAD FREE FINISH
LTC3857EUH#PBF
LTC3857IUH#PBF
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
For more information on tape and reel specifications, go to:
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL
V
V
I
V
2
FB1,2
LIM
TH1
IN
FB1,2
REFLNREG
BOOST1, BOOST2 ................................. –0.3V to 46V
Maximum Current Sourced into Pin
from Source >8V...............................................100μA
, PHASMD Voltages ....................... –0.3V to INTV
, I
CC
CC
TH2
........................................................ –0.3V to 6V
+
–
...................................................... –0.3V to 14V
, SENSE2
,V
Voltages ...................................... –0.3V to 28V
FB1
PARAMETER
Input Supply Operating Voltage Range
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
, V
FB2
+
, SENSE1
Voltages ...................... –0.3V to 6V
TAPE AND REEL
LTC3857EUH#TRPBF
LTC3857IUH#TRPBF
IN
) ......................... –0.3V to 40V
–
http://www.linear.com/leadfree/
PART MARKING*
3857
3857
CONDITIONS
(Note 4) I
–40°C to 125°C
–40°C to 85°C
(Note 4)
(Note 4) V
http://www.linear.com/tapeandreel/
A
= 25°C (Note 2). V
The
TH1,2
IN
= 4.5V to 38V
CC
CC
l
Voltage = 1.2V
denotes the specifications which apply over the full operating junction
PIN CONFIGURATION
IN
PACKAGE DESCRIPTION
32-Lead (5mm × 5mm) Plastic QFN
32-Lead (5mm × 5mm) Plastic QFN
= 12V, V
PLLIN/MODE
SENSE1
PHASMD
CLKOUT
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
SGND
RUN1
RUN2
FREQ
RUN1,2
–
1
2
3
4
5
6
7
8
32-LEAD (5mm 5mm) PLASTIC QFN
= 5V, EXTV
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
T
JMAX
l
= 125°C, θ
UH PACKAGE
TOP VIEW
SGND
CC
0.788
0.792
33
MIN
= 0V, unless otherwise noted.
4
JA
= 34°C/W
0.800
0.800
0.002
TYP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
±5
24
23
22
21
20
19
18
17
BOOST1
BG1
V
PGND
EXTV
INTV
BG2
BOOST2
IN
0.812
0.808
MAX
0.02
±50
38
CC
CC
UNITS
3857fc
%/V
nA
V
V
V