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PDF LTC3370 Data sheet ( Hoja de datos )
| Número de pieza | LTC3370 | |
| Descripción | 4-Channel 8A Configurable Buck DC/DCs | |
| Fabricantes | Linear | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3370 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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LTC3370
4-Channel 8A Configurable
Buck DC/DCs
Features
Description
n 8 × 1A 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 Zero Current In Shutdown (All Channels Off)
n 63µA 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 PGOODALL Pin Indicates All Enabled Bucks Are in
Regulation
n 32-Lead 5mm × 5mm QFN Package
Applications
n General Purpose Multichannel Power Supplies:
Automotive, Industrial, Distributed Power Systems
The LTC®3370 is a highly flexible multioutput power
supply IC. The device includes four synchronous buck
converters, 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 power configu-
rations via pin programmable C1-C3 pins. The common
buck switching frequency may be programmed with an
external resistor, synchronized to an external oscillator,
or set to a default internal 2MHz clock.
The operating mode for all DC/DCs may be programmed
via the PLL/MODE pin for Burst Mode or forced continuous
mode operation. A PGOODALL output indicates when all
enabled DC/DCs are within a specified percentage of their
final output value.
To reduce input noise, the buck converters are phased
in 90° steps. Precision enable pin thresholds facilitate
reliable power-up sequencing. The LTC3370 is available
in a 32-lead 5mm × 5mm QFN package.
L, LT, LTC, LTM, 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
649k
VOUT2
1.5V/2A
2.25V TO 5.5V
2.2µH
715k
649k
2.7V TO 5.5V
VINA VCC VINE
VINB
VINF
SWA SWE
SWB
SWF
FB1 FB2
EN1 EN2
LTC3370
VINC
VIND
SWC
SWD
VING
VINH
SWG
SWH
FB2 FB4
EN2 EN4
2.25V TO 5.5V
2.2µH
806k
649k
2.5V TO 5.5V
2.2µH
665k
309k
402k
PLL/MODE TEMP
RT PGOODALL
C1 C2 C3 GND
3370 TA01a
VOUT3
1.8V/2A
VOUT4
2.5V/2A
Buck Efficiency vs ILOAD
100
90
80
70
60 Burst Mode OPERATION
50
VIN = 3.3V
VOUT = 1.8V
40 f OSC = 1MHz
L = 3.3µH
30
20
1A BUCK
2A BUCK
10 3A BUCK
0 4A BUCK
1 10 100 1000 4000
LOAD CURRENT (mA)
3370 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
For more information www.linear.com/LTC3370
3370f
1
1 page  
LTC3370
E lectrical Characteristics The l denotes the specifications which apply over the full 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 (PGOODALL, PLL/MODE, CT, C1, C2, C3)
4.6 A
6.9 A
9.2 A
IOH Output High Leakage Current
PGOODALL 5.5V at Pin
VOL Output Low Voltage
PGOODALL 3mA into Pin
VIL C1, C2, C3 Input Low Threshold
VIH PLL/MODE, CT, C1, C2, C3 Input High
Threshold
l
l VCC – 0.4
0.1
1
0.4
0.4
µA
V
V
V
VIL PLL/MODE Input Low Threshold
Interface Logic Pins (EN1, EN2, EN3, EN4)
l
VCC – 1.2
V
VHI(ALLOFF)
VHI
VLO
IEN
Enable Rising Threshold
Enable Rising Threshold
Enable Falling Threshold
Enable Pin Leakage Current
All Regulators Disabled
At Least One Regulator Enabled
EN = 3.3V
l
l
340
730 1200
400 420
375
1
mV
mV
mV
µA
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 LTC3370 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3370E 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
LTC3370I is guaranteed over the –40°C to 125°C operating junction
temperature range. The LTC3370H 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 LTC3370 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/LTC3370
3370f
5
5 Page 
LTC3370
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
1A Buck Regulator Transient
Response (Forced Continuous
Mode)
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
0mA
4A Buck Regulator Transient
Response (Burst Mode Operation)
4A Buck Regulator Transient
Response (Forced Continuous
Mode)
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
0mA
VOUT
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
0mA
50µs/DIV
LOAD STEP = 100mA TO 700mA
VIN = 3.3V
VOUT = 1.8V
3370 G46
50µs/DIV
LOAD STEP = 400mA TO 2.8A
VIN = 3.3V
VOUT = 1.8V
3370 G47
50µs/DIV
LOAD STEP = 400mA TO 2.8A
VIN = 3.3V
VOUT = 1.8V
3370 G48
For more information www.linear.com/LTC3370
3370f
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC3370.PDF ] | |
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