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
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
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
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
(Note 4) I
TH1,2
Voltage = 1.2V
–40°C to 85°C, All Grades
LTC3890E, LTC3890I
LTC3890H, LTC3890MP
CONDITIONS
MIN
4
0.792
0.788
0.786
0.800
0.800
0.800
TYP
MAX
60
0.808
0.812
0.812
UNITS
V
V
V
V
3890fc
ELECTRICAL CHARACTERISTICS
l
l
2
LTC3890
ELECTRICAL CHARACTERISTICS
SYMBOL
I
FB1,2
V
REFLNREG
V
LOADREG
PARAMETER
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
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
(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
l
MIN
TYP
±5
0.002
0.01
MAX
±50
0.02
0.1
UNITS
nA
%/V
%
l
–0.01
2
1.3
2
50
60
14
–0.1
%
mmho
mA
mA
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
(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
l
l
l
l
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
ns
UVLO
Undervoltage Lockout
Feedback Overvoltage Protection
3.6
7
3.92
3.80
10
I
SENSE+
I
SENSE–
SENSE
+
Pin Current
SENSE
–
Pins Current
700
98
0.7
1.15
1.20
22
43
64
99
1.0
1.21
1.25
50
l
l
l
Maximum TG1, 2 Duty Factor
I
TRACK/SS1,2
Soft-Start Charge Current
V
RUN1
V
RUN2
RUN1 Pin On Threshold
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
TG1,2 t
r
TG1,2 t
f
BG1,2 t
r
BG1,2 t
f
TG/BG t
1D
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
1.4
1.27
1.30
36
57
85
30
50
75
2.5
1.5
2.4
1.1
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
C
LOAD
= 3300pF Each Driver
25
16
28
13
30
3890fc
3
LTC3890
ELECTRICAL CHARACTERISTICS
SYMBOL
BG/TG t
1D
t
ON(MIN)
V
INTVCCVIN
V
LDOVIN
V
INTVCCEXT
V
LDOEXT
V
EXTVCC
V
LDOHYS
f
25kΩ
f
65kΩ
f
105kΩ
f
LOW
f
HIGH
f
SYNC
V
PGL
I
PGOOD
V
PG
PARAMETER
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
Minimum On-Time
Internal V
CC
Voltage
INTV
CC
Load Regulation
Internal V
CC
Voltage
INTV
CC
Load Regulation
EXTV
CC
Switchover Voltage
EXTV
CC
Hysteresis
Programmable Frequency
Programmable Frequency
Programmable Frequency
Low Fixed Frequency
High Fixed Frequency
Synchronizable Frequency
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
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
t
PG
Delay for Reporting a Fault
–13
–10
2.5
10
2.5
25
l
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
(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
4.5
4.85
4.85
MIN
TYP
30
95
5.1
0.7
5.1
0.6
4.7
250
105
375
320
485
75
0.2
440
835
350
535
380
585
850
0.4
±1
–7
505
5.35
1.1
5.35
1.1
4.9
MAX
UNITS
ns
ns
V
%
V
%
V
mV
kHz
kHz
kHz
kHz
kHz
kHz
V
µA
%
%
%
%
µs
INTV
CC
Linear Regulator
Oscillator and Phase-Locked Loop
PGOOD1 and PGOOD2 Outputs
7
13
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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