Voltages ..................................... –0.3V to 28V
PLLIN/MODE, INTV
CC
Voltages ................... –0.3V to 6V
FREQ Voltage ........................................ –0.3V to INTV
CC
I
LIM
, PHASMD Voltages ....................... –0.3V to INTV
CC
EXTV
CC
..................................................... –0.3V to 14V
ITH1, ITH2, V
FB1
, V
FB2
Voltages ................... –0.3V to 6V
PGOOD1, PGOOD2 Voltages ....................... –0.3V to 6V
TRACK/SS1, TRACK/SS2 Voltages ............. –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3890E, LTC3890I ......................... –40°C to 125°C
LTC3890H .......................................... –40°C to 150°C
LTC3890MP ....................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
32 31 30 29 28 27 26 25
SENSE1
–
1
FREQ 2
PHASMD 3
CLKOUT 4
PLLIN/MODE 5
SGND 6
RUN1 7
RUN2 8
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3890EUH#PBF
LTC3890IUH#PBF
LTC3890HUH#PBF
LTC3890MPUH#PBF
AUTOMOTIVE PRODUCTS**
LTC3890EUH#WPBF
LTC3890IUH#WPBF
LTC3890HUH#WPBF
LTC3890EUH#WTRPBF
LTC3890IUH#WTRPBF
LTC3890HUH#WTRPBF
3890
3890
3890
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
TAPE AND REEL
LTC3890EUH#TRPBF
LTC3890IUH#TRPBF
LTC3890HUH#TRPBF
LTC3890MPUH#TRPBF
PART MARKING*
3890
3890
3890
3890
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–55°C to 150°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
**Versions
of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These
models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your
local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for
these models.
Rev. D
2
For more information
www.analog.com
LTC3890
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN1,2
= 5V, EXTV
CC
= 0V unless otherwise noted.
(Note 2)
SYMBOL
V
IN
V
FB1,2
PARAMETER
Input Supply Operating Voltage Range
Regulated Feedback Voltage
CONDITIONS
(Note 4) I
TH1,2
Voltage = 1.2V
–40°C to 85°C, All Grades
LTC3890E, LTC3890I
LTC3890H, LTC3890MP
(Note 4)
(Note 4) V
IN
= 4.5V to 60V
(Note 4)
Measured in Servo Loop,
∆
ITH
Voltage = 1.2V to 0.7V
(Note 4)
Measured in Servo Loop,
∆
ITH
Voltage = 1.2V to 2V
(Note 4) I
TH1,2
= 1.2V, Sink/Source = 5µA
(Note 5)
RUN1 = 5V and RUN2 = 0V, V
FB1
= 0.83V or
RUN1 = 0V and RUN2 = 5V, V
FB2
= 0.83V
RUN1,2 = 5V, V
FB1,2
= 0.83V (No Load)
RUN1 = 5V and RUN2 = 0V, V
FB1
= 0.83V (No Load) or
RUN1 = 0V and RUN2 = 5V, V
FB2
= 0.83V (No Load)
RUN1,2 = 5V, V
FB1,2
= 0.83V (No Load)
RUN1,2 = 0V
INTV
CC
Ramping Up
INTV
CC
Ramping Down
Measured at V
FB1,2
, Relative to Regulated V
FB1,2
Each Channel
Each Channel
V
SENSE–
< INTV
CC
– 0.5V
V
SENSE–
> INTV
CC
+ 0.5V
In Dropout
V
TRACK/SS1,2
= 0V
V
RUN1
Rising
V
RUN2
Rising
V
FB1,2
= 0.7V, V
SENSE1
–,
2
– = 3.3V, I
LIM
= 0
V
FB1,2
= 0.7V, V
SENSE1
–,
2
– = 3.3V, I
LIM
= INTV
CC
V
FB1,2
= 0.7V, V
SENSE1
–,
2
– = 3.3V, I
LIM
= FLOAT
MIN
4
0.792
0.788
0.786
TYP
MAX
60
0.808
0.812
0.812
±50
0.02
0.1
–0.1
UNITS
V
V
V
V
nA
%/V
%
%
mmho
mA
mA
75
100
25
4.2
4.0
13
±1
±1
µA
µA
µA
V
V
%
µA
µA
µA
%
µA
V
V
mV
mV
mV
mV
Ω
Ω
Ω
Ω
ns
ns
ns
ns
Rev. D
ELECTRICAL CHARACTERISTICS
l
l
I
FB1,2
V
REFLNREG
V
LOADREG
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
0.800
0.800
0.800
±5
0.002
0.01
–0.01
2
1.3
2
50
60
14
3.92
3.80
10
l
l
g
m1,2
I
Q
Transconductance Amplifier g
m
Input DC Supply Current
Pulse-Skipping or Forced Continuous
Mode (One Channel On)
Pulse-Skipping or Forced Continuous
Mode (Both Channels On)
Sleep Mode (One Channel On)
Sleep Mode (Both Channels On)
Shutdown
Undervoltage Lockout
Feedback Overvoltage Protection
SENSE
+
Pin Current
SENSE
–
Pins Current
UVLO
l
l
3.6
7
I
SENSE+
I
SENSE–
Maximum TG1, 2 Duty Factor
I
TRACK/SS1,2
Soft-Start Charge Current
RUN1 Pin On Threshold
V
RUN1
V
RUN2
RUN2 Pin On Threshold
RUN1,2 Pin Hysteresis
V
SENSE(MAX)
Maximum Current Sense Threshold
Gate Driver
TG1,2 Pull-Up On-Resistance
TG1,2 Pull-Down On-Resistance
BG1,2 Pull-Up On-Resistance
BG1,2 Pull-Down On-Resistance
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
l
l
98
0.7
1.15
1.20
22
43
64
l
l
l
700
99
1.0
1.21
1.25
50
30
50
75
2.5
1.5
2.4
1.1
1.4
1.27
1.30
36
57
85
TG1,2 t
r
TG1,2 t
f
BG1,2 t
r
BG1,2 t
f
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
25
16
28
13
For more information
www.analog.com
3
LTC3890
ELECTRICAL CHARACTERISTICS
PARAMETER
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay
BG/TG t
1D
Top Switch-On Delay Time
Minimum On-Time
t
ON(MIN)
INTV
CC
Linear Regulator
V
INTVCCVIN
Internal V
CC
Voltage
INTV
CC
Load Regulation
V
LDOVIN
V
INTVCCEXT
Internal V
CC
Voltage
INTV
CC
Load Regulation
V
LDOEXT
EXTV
CC
Switchover Voltage
V
EXTVCC
EXTV
CC
Hysteresis
V
LDOHYS
Oscillator and Phase-Locked Loop
Programmable Frequency
f
25kΩ
Programmable Frequency
f
65kΩ
Programmable Frequency
f
105kΩ
Low Fixed Frequency
f
LOW
High Fixed Frequency
f
HIGH
Synchronizable Frequency
f
SYNC
PGOOD1 and PGOOD2 Outputs
PGOOD Voltage Low
V
PGL
PGOOD Leakage Current
I
PGOOD
PGOOD Trip Level
V
PG
SYMBOL
TG/BG t
1D
The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN1,2
= 5V, EXTV
CC
= 0V unless otherwise noted.
(Note 2)
CONDITIONS
C
LOAD
= 3300pF Each Driver
C
LOAD
= 3300pF Each Driver
(Note 7)
6V < V
IN
< 60V, V
EXTVCC
= 0V
I
CC
= 0mA to 50mA, V
EXTVCC
= 0V
6V < V
EXTVCC
< 13V
I
CC
= 0mA to 50mA, V
EXTVCC
= 8.5V
EXTV
CC
Ramping Positive
4.85
4.85
4.5
MIN
TYP
30
30
95
5.1
0.7
5.1
0.6
4.7
250
105
440
835
350
535
5.35
1.1
5.35
1.1
4.9
MAX
UNITS
ns
ns
ns
V
%
V
%
V
mV
kHz
kHz
kHz
kHz
kHz
kHz
V
µA
%
%
%
%
µs
R
FREQ
= 25k, PLLIN/MODE = DC Voltage
R
FREQ
= 65k, PLLIN/MODE = DC Voltage
R
FREQ
= 105k, PLLIN/MODE = DC Voltage
V
FREQ
= 0V, PLLIN/MODE = DC Voltage
V
FREQ
= INTV
CC
, PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock
I
PGOOD
= 2mA
V
PGOOD
= 5V
V
FB
with Respect to Set Regulated Voltage
V
FB
Ramping Negative
Hysteresis
V
FB
with Respect to Set Regulated Voltage
V
FB
Ramping Positive
Hysteresis
375
320
485
75
505
380
585
850
0.4
±1
–7
13
l
0.2
–13
7
–10
2.5
10
2.5
25
t
PG
Delay for Reporting a Fault
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Ratings for extended periods may affect device reliability and
lifetime.
Note 2:
The LTC3890 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC3890E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3890I is guaranteed
over the –40°C to 125°C operating junction temperature range, the
LTC3890H is guaranteed over the –40°C to 150°C operating junction
temperature range and the LTC3890MP is tested and guaranteed over the
–55°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.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
• 34°C/W)
Note 4:
The LTC3890 is tested in a feedback loop that servos V
ITH1,2
to
a specified voltage and measures the resultant V
FB
. The specification at
85°C is not tested in production and is assured by design, characterization
and correlation to production testing at other temperatures (125°C for
the LTC3890E/LTC3890I, 150°C for the LTC3890H/LTC3890MP). For the
LTC3890MP the specification at –40°C is not tested in production and is
,
assured by design, characterization and correlation to production testing
at –55°C.
Note 5:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications information.
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7:
The minimum on-time condition is specified for an inductor
peak-to-peak ripple current ≥ 40% of I
MAX
(See Minimum On-Time
Considerations in the Applications Information section).
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