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LTC3774EUHE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38
LTC3774
1
3774fc
For more information www.linear.com/LTC3774
TYPICAL APPLICATION
FEATURES DESCRIPTION
Dual, Multiphase Current
Mode Synchronous Controller
for Sub-Milliohm DCR Sensing
The LTC
®
3774 is a dual PolyPhase
®
current mode syn-
chronous step-down switching regulator controller that
drives power
blocks, DRMOS or external gate drivers and
power MOSFETs. It offers an LTC-proprietary technique
that enhances the signal-to-noise ratio of the current
sense signal, allowing the use of inductors with very low
DC winding resistances as the current sense element for
maximum efficiency and reduced jitter.
The maximum current sense voltage is programmable
from 10mV to 30mV. High speed, low offset remote sense
differential amplifiers and a precise 0.6V reference provide
accurate output voltages between 0.6V and 3.5V from a wide
4.5V to 38V input supply range. Soft recovery from output
shorts or overcurrent minimizes output overshoot. Burst
Mode
®
operation, continuous and pulse-skipping modes
are supported. The constant operating frequency can be
synchronized to an external clock or linearly programmed
from 200kHz to 1.2MHz. Up to six LTC3774 controllers can
be paralleled for 1-, 2-, 3-, 4-, 6-, 8- or 12-phase operation.
The LTC3774 is available in a 36-lead (5mm × 6mm) QFN
package.
High Efficiency Dual Phase 1.5V/60A Step-Down Converter
APPLICATIONS
n
Sub-Milliohm DCR Current Sensing
n
Operates with Power Blocks, DRMOS or External
Gate Drivers and MOSFETs
n
Supports Phase Shedding and N+1 Phase
Redundancy
n
Programmable DCR Temperature Compensation
n
±0.75% Maximum Total DC Output Error Over
Temperature
n
Dual Differential Remote Output Voltage Sense
Amplifiers
n
Phase-Lockable Fixed Frequency Range: 200kHz to
1.2MHz
n
V
IN
Range: 4.5V to 38V
n
V
OUT
Range: 0.6V to 3.5V
n
Supports Smooth Start-Up into Pre-Biased Outputs
n
Programmable Soft-Start or V
OUT
Tracking
n
Hiccup Mode/Soft Recovery from Output Overcurrent
n
36-Lead (5mm × 6mm) QFN Package
n
Computer Systems
n
Telecom and Datacom Systems
n
Industrial Equipment
n
DC Power Distribution Systems
L, LT, LTC , LT M, Linear Technology, the Linear logo, PolyPhase and Burst Mode are registered
trademarks and No R
SENSE
and Hot Swap are trademarks of Analog Devices, Inc. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5481178, 5705919, 5929620, 6177787, 6580258, 6498466, 6611131, patent pending.
3774 TA01a
V
IN
4.5V TO 20V
RUN1, 2
ILIM1, 2
HIZB1
HIZB2
PWM1
PWMEN1
V
OSNS1
–
SNSA1
+
SNS1
–
SNSD1
+
V
OSNS1
+
I
TH1
PHSMD
CLKOUT
PGOOD1,2
MODE/PLLIN
PWM2
PWMEN2
GND
V
OSNS2
–
SNSA2
+
SNS2
–
SNSD2
+
FREQ
V
OSNS2
+
I
TH2
LTC3774
V
IN
1/4 INTV
CC
TK/SS2TK/SS1 INTV
CC
37.5k
15k
DRMOS DRMOS
f
IN
500kHz
0.33µH
(0.32mΩ DCR)
0.33µH
(0.32mΩ DCR)
10k
300µF
4V
330µF
4V
15k
0.1µF 4.7µF
2200pF
+
+
V
OUT
1.5V
60A
22µF
50V
LTC3774
2
3774fc
For more information www.linear.com/LTC3774
http://www.linear.com/product/LTC3774#orderinfo
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ................................................. –0.3V to 40V
HIZB Voltage .............................................. –0.3V to 40V
RUN, PGOOD, INTV
CC
Voltage ..................... –0.3V to 6V
SNSA1
+
, SNSA2
+
, SNSD1
+
,
SNSD2
+
, SNS1
–
, SNS2
–
........................–0.3V to INTV
CC
INTV
CC
Peak Output Current ..................................20mA
All Other Pin Voltages ...........................–0.3V to INTV
CC
Operating Junction Temperature Range
(Note 2) .................................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
11 12 13 14
TOP VIEW
37
GND
UHE PACKAGE
36-LEAD (5mm × 6mm) PLASTIC QFN
15 16 17 18
36 35 34 33 32 31 30 29
21
22
23
24
25
26
27
28
8
7
6
5
4
3
2
1ITEMP2
ITH2
V
OSNS2
–
V
OSNS2
+
TK/SS2
HIZB2
PWMEN2
PWM2
RUN2
GND
ITEMP1
ITH1
V
OSNS1
–
V
OSNS1
+
TK/SS1
HIZB1
PWMEN1
PWM1
RUN1
GND
ILIM2
V
IN
INTV
CC
CLKOUT
MODE/PLLIN
FREQ
PHSMD
ILIM1
SNSD2
+
SNS2
–
SNSA2
+
PGOOD2
PGOOD1
SNSA1
+
SNS1
–
SNSD1
+
20
19
9
10
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 37) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3774EUHE#PBF LTC3774EUHE#TRPBF 3774
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
LTC3774IUHE#PBF LTC3774IUHE#TRPBF 3774
36-Lead (5mm × 6mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with
#TRMPBF suffix.
LTC3774
3
3774fc
For more information www.linear.com/LTC3774
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= 15V, V
RUN
= 5V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop/Whole System
V
IN
Input Voltage Range 4.5 38 V
V
OUT
Output Voltage Range
l
0.6 3.5 V
V
OSNS
+
Regulated Feedback Voltage I
TH
= 1.2V (Note 3)
l
595.5 600 604.5 mV
I
OSNS
+
Feedback Current –30 –100 nA
V
REFLNREG
Reference Voltage Line Regulation V
IN
= 4.5V to 38V 0.002 0.01 %/V
V
LOADREG
Output Voltage Load Regulation ∆I
TH
= 1.2V to 0.7V
∆I
TH
= 1.2V to 1.6V
l
l
0.01
0.01
0.1
0.1
%
%
g
m
Transconductance Amplifier g
m
I
TH
= 1.2V, Sink/Source 5µA 2 mmho
f
0dB
DA Unity-Gain Crossover Frequency (Note 5) 4 MHz
V
OVL
Feedback Overvoltage Lockout Measured at V
OSNS
+
l
5 7.5 10 %
I
Q
Input DC Supply Current
Normal Mode
Shutdown
(Note 4)
V
RUN
= 0V
9
40
60
mA
µA
DF
MAX
Maximum Duty Factor In Dropout 96 98 %
UVLO Undervoltage Lockout V
INTVCC
Falling 3.5 3.75 4.0 V
UVLO
HYS
UVLO Hysteresis 500 mV
I
SNSA
+
Sense Pin Bias Currents V
SNSA
+
= 3.3V ±0.5 ±2 µA
I
SNSD
+
Sense Pin Bias Currents V
SNSD
+
= 3.3V 30 nA
I
SNS
–
Sense Pin Bias Currents V
SNS
–
= 3.3V 10 µA
A
VT_SNS
Total Sense Signal Gain to Current
Comparator
5 V/V
I
TEMP
DCR Tempco Compensation Current V
ITEMP
= 0.5V
l
27 30 33 µA
I
TK/SS
Soft-Start Charge Current V
TK/SS
= 0V
l
1 1.25 1.5 µA
t
SS(INTERNAL)
Internal Soft-Start Time V
TK/SS
= 5V 600 µs
V
HIZB
HIZB Pin On Threshold V
HIZB
Rising 2.2 V
V
HIZB_HYS
HIZB Pin On Hysteresis 600 mV
V
RUN
RUN Pin On Threshold V
RUN
Rising
l
1.1 1.22 1.34 V
V
RUN_HYS
RUN Pin On Hysteresis 80 mV
I
RUN
RUN Pin Pull-Up Current
RUN < On Threshold
RUN > On Threshold
RUN < 1.1V
RUN > 1.34V
1
5
µA
µA
V
SENSE(MAX)
Maximum Current Sense Threshold I
TH
= 2V, V
SNS
– = 3.3V
I
LIM
= 0V
I
LIM
= 1/4 INTV
CC
I
LIM
= Float
I
LIM
= 3/4 INTV
CC
I
LIM
= INTV
CC
l
l
l
l
l
9.25
14
19
24
28.25
10.25
15
20
25
29.75
11.25
16
21
26
31.25
mV
mV
mV
mV
mV
Power Good
V
PGOOD(ON)
PGOOD Pull-Down Resistance 90 200 Ω
I
PGOOD(OFF)
PGOOD Leakage Current V
PGOOD
= 5V –2 2 µA
t
PGOOD
V
PGOOD
High to Low Delay 45 µs
V
PGOOD
PGOOD Trip Level V
OSNS
+ with Respect to Set Output Voltage
V
OSNS
+ Ramping Up
V
OSNS
+ Ramping Down
5
–5
7.5
–7.5
10
–10
%
%
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P38

LTC3774EUHE#TRPBF

Mfr. #:
Buy LTC3774EUHE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual, Multiphase Current Mode Synchronous Controller for Sub-Milliohm DCR Sensing
Lifecycle:
New from this manufacturer.
Delivery:
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