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PDF LTC3880-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3880-1 | |
| Descripción | Dual Output PolyPhase Step-Down DC/DC Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC3880/LTC3880-1
FEATURES
Dual Output PolyPhase
Step-Down DC/DC Controller with
Digital Power System Management
DESCRIPTION
n PMBus/I2C Compliant Serial Interface
– Telemetry Read Back includes VIN, IIN, VOUT, IOUT,
Temperature and Faults
– Programmable Voltage, Current Limit, Digital
Soft-Start/Stop, Sequencing, Margining, OV/UV
and Frequency Synchronization (250kHz to 1MHz)
n ±0.5% Output Voltage Accuracy over Temperature
n Integrated 16-Bit ADC
n Internal EEPROM and Fault Logging
n Integrated Powerful N-Channel MOSFET Gate Drivers
Power Conversion
n Wide VIN Range: 4.5V to 24V
n VOUT Range: 0.5V to 5.5V
n Analog Current Mode Control Loop
n Supports Power-Up Into Pre-Biased Load
n Accurate PolyPhase® Current Sharing for Up to 6 Phases
n Available in a 40-Pin (6mm × 6mm) QFN Package
APPLICATIONS
n High Current Distributed Power Systems
n Telecom, Datacom and Storage Systems
n Intelligent Energy Efficient Power Regulation
The LTC®3880/LTC3880-1 are dual, PolyPhase DC/DC
synchronous step-down switching regulator controllers
with an I2C-based PMBus compliant serial interface.
The controllers use a constant frequency, current mode
architecture that is supported by LTpowerPlay™ software
development tool with graphical user interface (GUI).
Switching frequency, output voltage, and device address
can be programmed using external configuration resistors.
Additionally, parameters can be set via the digital interface
or stored in EEPROM. Voltage, current, internal/external
temperature and fault status can be read back through
the bus interface.
The LTC3880/LTC3880-1 can be configured for Burst
Mode® operation, discontinuous (pulse-skipping) mode
or continuous inductor current mode. The LTC3880 incor-
porates a 5V linear regulator while the LTC3880-1 uses an
external 5V supply for minimum power loss.
www.DataSheet.net/
L, LT, LTC, LTM, PolyPhase, Burst Mode, µModule, Linear Technology and the Linear logo are
registered trademarks and No RSENSE and LTpowerPlay are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258, 5408150,
7420359.
TYPICAL APPLICATION
VOUT0
3.3V
15A
+
530µF
VIN
1.0µH
2.15k
0.2µF
10µF
0.1µF
10nF
6.04k
2200pF
*SOME DETAILS OMITTED
FOR CLARITY
PMBus
INTERFACE
TO/FROM
OTHER LTC DEVICES
WRITE PROTECT
VIN INTVCC
TG0 TG1
LTC3880*
1µF
0.1µF
BOOST0 BOOST1
SW0 SW1
0.56µH
BG0
PGND
BG1
1.74k
0.2µF
IVVISSSSEEEENNNNSSSSEEEEOOOO+–+–
IISSEENNSSEE11+–
VSENSE1
TSNS0
TSNS1
2200pF 4.99k
ITHO
ITH1
10nF
SDA
SCL
ALERT
RUN0
RUN1
GPIO0
GPIO1
VDD33
VDD25
SHARE_CLK
WP SGND
FAULT MANAGEMENT
1µF 1µF
VOUT1
1.8V
20A
+
530µF
3880 TA01a
Efficiency and Power Loss
vs Load Current
100
90
VIN = 12V
VOUT = 1.8V
80
6
5
70 4
60
50 3
40
30 2
20 1
10
0
0.01
0.1 1 10
LOAD CURRENT (A)
0
100
3880 TA01b
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Datasheet pdf - http://www.DataSheet4U.co.kr/
1 page  
LTC3880/LTC3880-1
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise
driven) unless otherwise specified.
specifications
are
at
TA
=
25°C.
(Note
2)
VIN
=
12V,
VRUN0,1
=
3.3V,
fSYNC
=
500kHz
(externally
SYMBOL PARAMETER
Input Voltage
VIN Input Voltage Range
IQ Input Voltage Supply Current
Normal Operation
VUVLO
Undervoltage Lockout Threshold
when VIN > 4.3V
Control Loop
VOUT1R0
Full-Scale Voltage Range 0
Set Point Accuracy (0.6V to 5V)
Resolution
LSB Step Size
VOUT1R1
Full-Scale Voltage Range 1
Set Point Accuracy (0.6V to 2.5V)
Resolution
LSB Step Size
VOUT0R0
Full-Scale Voltage Range 0
Set Point Accuracy (0.6V to 4.096V)
Resolution
LSB Step Size
VOUT0R1
Full-Scale Voltage Range 1
Set Point Accuracy (0.6V to 2.5V)
Resolution
LSB Step Size
VLINEREG
VLOADREG
Line Regulation
Load Regulation
gm0,1
IISENSE0,1
VSENSERIN0
VSENSERIN1
VIlLIMIT
Error Amplifier gm
Input Current
VSENSE Input Resistance to Ground
VSENSE Input Resistance to Ground
Resolution
VILIMMAX
VILMMIN
Gate Drivers
TG0,1
TG Transition Time:
tr Rise Time
tf Fall Time
BG0,1
BG Transition Time:
ttrf
Rise Time
Fall Time
TG/BG t1D Top Gate Off to Bottom Gate On Delay Time
BG/TG t2D Bottom Gate Off to Top Gate On Delay Time
tON(MIN)
Minimum On-Time
OV/UV Output Voltage Supervisor Channel 0
N Resolution
V0RANGE0
V0RANGE1
V0OUSTP0
V0OUSTP1
Voltage Monitoring Range
Voltage Monitoring Range
Threshold Programming Step
Threshold Programming Step
CONDITIONS
(Note 12)
(Note 14)
VRUN0,1 = 3.3V, No Caps on TG and BG
VRUN0,1 = 0V
VVIINNTTVVCCCC//VVEEXXTTVVCCCC
Falling
Rising
VOUT_COMMAND(1) = 5.500V (Note 9)
VOUT_COMMAND(1) = 2.75V (Note 9)
VOUT_COMMAND(0) = 4.095V (Note 9)
VOUT_COMMAND(0) = 2.75V (Note 9)
6V < VIN < 24V
www.DataSheet.net/
∆VITH = 1.35V – 0.7V
∆VITH = 1.35V – 2.0V
ITH0,1 =1.22V
VISENSE = 5.5V
0V ≤ VPIN ≤ 5.5V
0V ≤ VPIN ≤ 5.5V
Hi Range
Lo Range
Hi Range
Lo Range
(Note 4)
CLOAD = 3300pF
CLOAD = 3300pF
(Note 4)
CCLLOOAADD
=
=
3300pF
3300pF
(Note 4) CLOAD = 3300pF Each Driver
(Note 4) CLOAD = 3300pF Each Driver
Range Value = 0
Range Value = 1
Range Value = 0
Range Value = 1
MIN TYP MAX
l 4.5
24
25
20
3.7
3.95
l 5.4
l –0.5
12
1.375
5.6
0.5
l 2.7
2.8
l –0.5
0.5
12
0.6875
l 4.0
l –0.5
12
1.375
4.2
0.5
l 2.7
2.8
l –0.5
0.5
12
0.6875
l ±0.02
l 0.01 0.1
l –0.01 –0.1
3
l ±1 ±10
41
37
3
l 68 75 82
l 44 50 56
37.5
25
UNITS
V
mA
mA
V
V
V
%
Bits
mV
V
%
Bits
mV
V
%
Bits
mV
V
%
Bits
mV
%/V
%
%
mmho
µA
kΩ
kΩ
bits
mV
mV
mV
mV
30
30
30
30
30
30
90
8
1 4.096
0.5 2.7
22
11
ns
ns
ns
ns
ns
ns
ns
Bits
V
V
mV
mV
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Datasheet pdf - http://www.DataSheet4U.co.kr/
5 Page 
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3880/LTC3880-1
VOUT Command INL
2.0
1.5
1.0
0.5
0
–0.5
–1.0
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
VOUT (V)
3880 G19
VOUT OV Threshold
vs Temperature (1V Target)
1.010
1.005
1.000
0.995
0.990
–50 –30 –10 10 30 50 70
TEMPERATURE (°C)
90 110
3880 G22
Temperature Error
vs Temperature
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–45 –25 –5 15 35 55 75 95 115
ACTUAL TEMPERATURE (°C)
3880 G25
VOUT Command DNL
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
VOUT (V)
3880 G20
VOUT OV Threshold
vs Temperature (2V Target)
2.03
2.02
2.01
2.00
1.99
www.DataSheet.net/
1.98
1.97
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3880 G23
IOUT Error vs IOUT Room
Temperature
8
6
4
2
0
–2
–4
–6
–8
0 5 10 15 20
OUTPUT CURRENT (A)
3880 G26
INTVCC Line Regulation
5.25
5.00
4.75
4.50
4.25
4.00
3.75
3.50
5
10 15 20
VIN (V)
25
3880 G21
VOUT OV Threshold
vs Temperature (4V Target)
4.04
4.03
4.02
4.01
4.00
3.99
3.98
3.97
3.96
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
3880 G24
IIN Measurement Error vs IIN
2
0
–2
–4
–6
–8
–10
–12
0
0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
IIN (A)
3880 G27
3880fa
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Datasheet pdf - http://www.DataSheet4U.co.kr/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3880-1.PDF ] | |
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