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PDF LTC3371 Data sheet ( Hoja de datos )
| Número de pieza | LTC3371 | |
| Descripción | 4-Channel 8A Configurable Buck DC/DCs | |
| Fabricantes | Linear | |
| Logotipo |  |
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Features
LTC3371
4-Channel 8A Configurable
Buck DC/DCs with Watchdog
and Power-On Reset
Description
n 8 × 1A Buck Power Stages Configurable as 2, 3 or 4
Output Channels
n 8 Unique Output Configurations (1A to 4A Per Channel)
n Independent VIN Supplies for Each DC/DC (2.25V to 5.5V)
n Low Total No Load Supply Current:
n 15µA In Shutdown (All Channels Off)
n 68µA One Channel Active in Burst Mode®Operation
n 18µA Per Additional Channel
n Precision Enable Pin Thresholds for Autonomous
Sequencing
n 1MHz to 3MHz RT Programmable Frequency
(2MHz Default) or PLL Synchronization
n Temp Monitor Indicates Die Temperature
n CT Programmed Watchdog Timer
n Independent RST Pins Indicate Buck in Regulation
n Thermally Enhanced 38-Lead 5mm × 7mm QFN and
TSSOP Packages
Applications
n General Purpose Multichannel Power Supplies:
Automotive, Industrial, Distributed Power Systems
The LTC®3371 is a highly flexible multioutput power supply
IC. The device includes four synchronous buck convert-
ers, configured to share eight 1A power stages, each of
which is powered from independent 2.25V to 5.5V inputs.
The DC/DCs are assigned to one of eight possible power
configurations via pin programmable C1-C3 pins. The
common buck switching frequency may be programmed
with an external resistor, synchronized to an external oscil-
lator, or set to a default internal 2MHz clock. The operating
mode for all DC/DCs may be programmed for Burst Mode
or forced continuous mode operation.
The CT pin programs the timing parameters of four inde-
pendent RST pins as well as the watchdog timer.
To reduce input noise, the buck converters are phased in
90° steps. Precision enable pin thresholds facilitate reli-
able power sequencing. The LTC3371 is available in low
profile 38-lead 5mm × 7mm QFN and TSSOP packages.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Typical Application
VOUT1 = 1.2V/2A
2.25V TO 5.5V
2.2µH
324k
645k
VOUT2 = 1.5V/2A
2.25V TO 5.5V
2.2µH
412k
475k
2.7V TO 5.5V
VINA VCC VINE
VINB
VINF
SWA SWE
SWB SWF
FB1 FB3
EN1 EN3
RST1 LTC3371 RST3
VINC
VIND
SWC
SWD
VING
VINH
SWG
SWH
FB2
EN2
RST2
FB4
EN4
RST4
2.25V TO 5.5V
806k
649k
2.5V TO 5.5V
665k
309k
PLL/MODE TEMP
RT WDI
CT C1 C2 C3
WDO
GND
3371 TA01
VOUT3 = 1.8V/2A
VOUT4 = 2.5V/2A
Buck Efficiency vs ILOAD
100
90
80
70
60
50
40
30 Burst Mode OPERATION
20
VIN = 3.3V
VOUT = 1.8V
10 f OSC = 1MHz
L = 3.3µH
0
1 10 100
LOAD CURRENT (mA)
1A BUCK
2A BUCK
3A BUCK
4A BUCK
1000 4000
3371 TA01b
C3 C2 C1 BUCK1 BUCK2 BUCK3 BUCK4
0 0 0 2A 2A 2A 2A
0 0 1 3A 1A 2A 2A
0 1 0 3A 1A 1A 3A
0 1 1 4A 1A 1A 2A
1 0 0 3A 2A – 3A
1 0 1 4A – 2A 2A
1 1 0 4A – 1A 3A
1 1 1 4A –
– 4A
3371fa
For more information www.linear.com/LTC3371
1
1 page  
LTC3371
E lectrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. (Note 2) VCC = VINA-H = 3.3V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Buck Regulators Combined
IFWD2
PMOS Current Limit
2 Buck Power Stages Combined (Note 5)
IFWD3
PMOS Current Limit
3 Buck Power Stages Combined (Note 5)
IFWD4
PMOS Current Limit
4 Buck Power Stages Combined (Note 5)
Interface Logic Pins (RST1-4, WDO, WDI, PLL/MODE, C1, C2, C3)
4.6
6.9
9.2
A
A
A
IOH Output High Leakage Current
VOL Output Low Voltage
VIH WDI Input High Threshold
VIL WDI, C1, C2, C3 Input Low Threshold
tWDI(WIDTH)
WDI Pulse Width
VIH PLL/MODE, C1, C2, C3 Input High Threshold
VIL PLL/MODE Input Low Threshold
Interface Logic Pins (EN1, EN2, EN3, EN4)
RST1-4, WDO 5.5V at Pin
RST1-4, WDO 3mA into Pin
1
0.1 0.4
l 1.2
l 0.4
l 40
l VCC – 0.4
l
VCC – 1.2
µA
V
V
V
ns
V
V
VHI(ALLOFF)
Enable Rising Threshold
VHI Enable Rising Threshold
VLO Enable Falling Threshold
IEN Enable Pin Leakage Current
CT Timing Parameters; CT = 10nF
tWDI0
Time from WDO Low Until Next WDO Low
All Regulators Disabled
At Least One Regulator Enabled
EN = 3.3V
CT = 10nF
l 730 1200
l 400 420
340 390
1
10.3 12.9 15.5
l 6.2
12.9
mV
mV
mV
µA
Sec
Sec
tWDI
Time from Last WDI Until Next WDO Low
CT = 10nF
1.30 1.62 1.95
l 0.77 1.62
Sec
Sec
tWDL Watchdog Lower Boundary
CT = 10nF
40 50.6 60
l 50.6 65
ms
ms
tWDO
WDO Low Time Absent a Transition at WDI
CT = 10nF
tRST RST Assertion Delay
CT = 10nF
160 202 280
160 202 240
ms
ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3371 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3371E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3371I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3371H is guaranteed over the –40°C to 150°C
operating junction temperature range. High junction temperatures degrade
operating lifetimes; operating lifetime is derated for junction temperatures
greater than 125°C. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors. The junction temperature
(TJ in °C) is calculated from the ambient temperature (TA in °C) and power
dissipation (PD in Watts) according to the formula:
TJ = TA + (PD • θJA)
where θJA (in °C/W) is the package thermal impedance.
Note 3: The LTC3371 includes overtemperature protection which protects
the device during momentary overload conditions. Junction temperatures
will exceed 150°C when overtemperature protection is active. Continuous
operation above the specified maximum operating junction temperature
may impair device reliability.
Note 4: Static current, switches not switching. Actual current may be
higher due to gate charge losses at the switching frequency.
Note 5: The current limit features of this part are intended to protect the
IC from short term or intermittent fault conditions. Continuous operation
above the maximum specified pin current rating may result in device
degradation over time.
For more information www.linear.com/LTC3371
3371fa
5
5 Page 
LTC3371
Typical Performance Characteristics TA = 25°C unless otherwise noted.
1A Buck Regulator, Transient
Response (Burst Mode Operation)
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
50µs/DIV
LOAD STEP = 100mA TO 700mA
VIN = 3.3V
VOUT = 1.8V
3371 G46
1A Buck Regulator, Transient
Response (Forced Continuous Mode)
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
50µs/DIV
LOAD STEP = 100mA TO 700mA
VIN = 3.3V
VOUT = 1.8V
3371 G47
4A Buck Regulator, Transient
Response (Burst Mode Operation)
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
0mA
50µs/DIV
LOAD STEP = 400mA TO 2.8A
VIN = 3.3V
VOUT = 1.8V
3371 G48
4A Buck Regulator, Transient
Response (Forced Continuous Mode)
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
0mA
50µs/DIV
LOAD STEP = 400mA TO 2.8A
VIN = 3.3V
VOUT = 1.8V
3371 G49
For more information www.linear.com/LTC3371
3371fa
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet LTC3371.PDF ] | |
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