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Linear Technology Electronic Components Datasheet

LTC3856IFE Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

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Features
n PolyPhase® Controller Reduces Input and Output
Capacitance and Power Supply Induced Noise
n Wide VIN Range: 4.5V to 38V Operation
n ±0.75%, 0.6V Reference Voltage Accuracy
n High Efficiency: Up to 95%
n Programmable Burst Mode® Operation or
Stage Sheddingfor Highest Light Load Efficiency
n Active Voltage Positioning (AVP)
n RSENSE or DCR Current Sensing
n Programmable DCR Temperature Compensation
n Phase-Lockable Fixed Frequency: 250kHz to 770kHz
n True Remote Sense Differential Amplifier
n Dual N-Channel MOSFET Synchronous Drive
n VOUT Range: 0.6V to 5V without Differential Amplifier
n VOUT Range: 0.6V to 3.3V with Differential Amplifier
n Adjustable Soft-Start or VOUT Tracking
n Stackable for Up to 12-Phase Operation
n 32-Pin (5mm × 5mm) QFN and 38-Pin TSSOP Packages
Applications
n Telecom and Datacom Systems
n Industrial and Medical Instruments
n DC Power Distribution Systems
n Computer Systems
LTC3856
2-Phase Synchronous
Step-Down DC/DC
Controller with Diffamp
Description
The LTC®3856 is a single output, dual channel PolyPhase
synchronous step-down DC/DC controller that drives all
N-channel power MOSFET stages. This device includes a
high speed differential amplifier for remote output volt-
age sense. Power loss and supply noise are minimized by
operating the two controller output stages out-of-phase
and up to 12-phase operation can be achieved.
The LTC3856 monitors the output current by sensing
the voltage drop across the output inductor (DCR) or by
using a sense resistor. DCR temperature compensation
maintains an accurate current sense threshold over a
broad temperature range. A constant-frequency, current
mode architecture allows a phase-lockable frequency of
up to 770kHz.
A wide 4.5V to 38V input supply range encompasses
most intermediate bus voltages and battery chemistries.
Burst Mode operation, continuous or Stage Shedding
modes are supported. A TK/SS pin shared by both chan-
nels ramps the output voltage during start-up.
L, LT, LTC, LTM, Linear Technology, the Linear logo, PolyPhase, Burst Mode and OPTI-LOOP
are registered trademarks and Stage Shedding is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5705919, 5929620, 6100678, 6144194, 6177787, 6304066, 6498466,
6580258, 6611131, 6674274.
Typical Application
High Efficiency 1.5V/50A Step-Down Converter
30.1k
20k
DIFFOUT VIN
TG1
VFB
BOOST1
ILIM LTC3856 SW1
RUN
BG1
PGOOD
CLKOUT
PHASMD
PLLIN
SENSE1+
SENSE1
MODE
TG2
ITEMP
BOOST2
FREQ
SW2
122k
EXTVCC
DIFFN
DIFFP
BG2
INTVCC
SENSE2+
SENSE2
ITH TK/SS GND AVP ISET
2200pF
1.5k 0.1µF
3856 TA01a
0.1µF
0.1µF
4.7µF
0.33µH
0.33µH
VIN
10µF 4.5V TO
× 4 20V
VOUT
1.5V
50A
100µF
×8
For more information www.linear.com/LTC3856
Efficiency and Power Loss
vs Output Current
100
100
VIN = 12V
90 VOUT = 1.5V
80
Burst Mode
OPERATION
10
70
60
50
1
40
30
0
20
10
0
0.1
1
–1
10
100
LOAD CURRENT (A)
3856 TA01b
3856fa
1


Linear Technology Electronic Components Datasheet

LTC3856IFE Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3856
Absolute Maximum Ratings (Note 1)
Input Supply Voltage (VIN).......................... 40V to –0.3V
Topside Driver Voltages (BOOSTn)............. 46V to –0.3V
Switch Voltage (SWn).................................... 40V to –5V
INTVCC, RUN, PGOOD, EXTVCC,
(BOOSTn – SWn).......................................... 6V to –0.3V
SENSEn Voltages....................................... 5.5V to –0.3V
MODE, PLLIN, ILIM, TK/SS, AVP,
FREQ, ISET Voltages.............................. INTVCC to –0.3V
DIFFP, DIFFN, DIFFOUT, PHASMD,
ITEMP Voltages...................................... INTVCC to –0.3V
ITH, VFB Voltages.................................... INTVCC to –0.3V
INTVCC Peak Output Current.................................100mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range.................... –65°C to 125°C
Reflow Peak Body Temperature (UH Package)....... 260°C
Lead Temperature (Soldering, 10 sec.)
FE Package............................................................. 300°C
Pin Configuration
FREQ 1
RUN 2
SENSE1+ 3
SENSE14
NC 5
TK/SS 6
VFB 7
ITH 8
SGND 9
AVP 10
ITEMP 11
PHASMD 12
SENSE2+ 13
SENSE2– 14
DIFFP 15
DIFFN 16
DIFFOUT 17
ISET 18
ILIM 19
TOP VIEW
39
SGND
38 PLLIN
37 CLKOUT
36 SW1
35 TG1
34 NC
33 BOOST1
32 PGND1
31 BG1
30 VIN
29 INTVCC
28 EXTVCC
27 BG2
26 PGND2
25 NC
24 BOOST2
23 TG2
22 SW2
21 PGOOD
20 MODE
FE PACKAGE
38-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 25°C/W
EXPOSED PAD (PIN 39) IS SGND/PGND, MUST BE SOLDERED TO PCB
TOP VIEW
32 31 30 29 28 27 26 25
TK/SS 1
24 BOOST1
VFB 2
ITH 3
AVP 4
ITEMP 5
PHASMD 6
SENSE2+ 7
SENSE28
33
SGND/PGND
23 BG1
22 VIN
21 INTVCC
20 EXTVCC
19 BG2
18 BOOST2
17 TG2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33) IS SGND/PGND, MUST BE SOLDERED TO PCB
3856fa
2
For more information www.linear.com/LTC3856


Part Number LTC3856IFE
Description 2-Phase Synchronous Step-Down DC/DC Controller
Maker Linear Technology
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