Voltage ......................................... –0.3V to 14V
ITH, V
FB
Voltages ........................................ –0.3V to 6V
SS, OVLO Voltages ..................................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC3896E, LTC3896I ........................ –40°C to 125°C
LTC3896H ......................................... –40°C to 150°C
Storage Temperature Range ................. –65°C to 150°C
V
OUT–
10
CLKOUT 11
GND 12
PLLIN 13
PGOOD 14
V
OUT–
15
NC 16
FREQ 17
DRVSET 18
DRVUV 19
FE PACKAGE
38-LEAD PLASTIC TSSOP
T
JMAX
= 150°C,
θ
JA
= 28°C/W
EXPOSED PAD (PIN 39) IS V
OUT–
, MUST BE SOLDERED TO PCB
FOR RATED ELECTRICAL AND THERMAL CHARACTERISTICS
orDer inForMaTion
LEAD FREE FINISH
LTC3896EFE#PBF
LTC3896IFE#PBF
LTC3896HFE#PBF
TAPE AND REEL
LTC3896EFE#TRPBF
LTC3896IFE#TRPBF
LTC3896HFE#TRPBF
http://www.linear.com/product/LTC3896#orderinfo
PART MARKING
LTC3896FE
LTC3896FE
LTC3896FE
PACKAGE DESCRIPTION
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
38-Lead Plastic TSSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°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 nonstandard 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/
2
3896f
For more information
www.linear.com/LTC3896
LTC3896
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
= 12V, V
RUN
= 5V with respect to GND, EXTV
CC
=
0V, V
DRVSET
= 0V, VPRG = FLOAT unless otherwise noted. All pin voltages with respect to V
OUT–
, unless otherwise noted.
SYMBOL
V
IN
V
OUT–
V
FB
PARAMETER
Input Supply Operating Voltage Range
(V
IN
+ |V
OUT–
|)
Regulated Output Voltage Set Point
Regulated Feedback Voltage
CONDITIONS
(Note 10) DRVUV = V
OUT–
V
IN
+ |V
OUT–
| ≤ 140V
(Note 4); ITH Voltage = 1.2V
0°C to 85°C, VPRG = FLOAT
VPRG = FLOAT
VPRG = V
OUT–
VPRG = INTV
CC
(Note 4)
VPRG = FLOAT
VPRG = V
OUT–
or INTV
CC
(Note 4) V
IN
= 4.5V to 150V
(Note 4) Measured in Servo Loop,
∆ITH Voltage = 1.2V to 0.7V
(Note 4) Measured in Servo Loop, ∆ITH
Voltage = 1.2V to 1.6V
g
m
I
Q
Transconductance Amplifier g
m
Input DC Supply Current
Sleep Mode
Shutdown
UVLO
Undervoltage Lockout
(Note 4) ITH = 1.2V, Sink/Source 5µA
(Note 5) V
DRVSET
= V
OUT–
2.5
40
10
l
l
l
l
l
l
l
elecTrical characTerisTics
MIN
4
–60
0.792
0.788
3.220
4.875
TYP
MAX
140
–0.8
UNITS
V
V
V
V
V
V
µA
µA
%/V
%
%
mmho
mA
l
l
l
0.800
0.800
3.300
5.000
–0.006
4
0.002
0.01
–0.01
2.2
0.808
0.812
3.380
5.125
±0.050
6
0.02
0.1
–0.1
I
FB
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Pulse-Skipping or Forced Continuous Mode V
FB
= 0.83V (No Load)
V
FB
= 0.83V (No Load)
RUN = 0V with Respect to GND
DRV
CC
Ramping Up
DRVUV = V
OUT–
DRVUV = INTV
CC
, DRVSET = INTV
CC
DRV
CC
Ramping Down
DRVUV = V
OUT–
DRVUV = INTV
CC
, DRVSET = INTV
CC
V
RUN
ON
V
RUN
Hyst
OVLO
OVLO Hyst
RUN Pin ON Threshold
RUN Pin Hysteresis
Overvoltage Lockout Threshold
OVLO Hysteresis
OVLO Delay
Feedback Overvoltage Protection
I
SENSE+
I
SENSE–
SENSE
+
Pin Current
SENSE
–
Pin Current
Maximum Duty Factor
I
SS
Soft-Start Charge Current
V
SENSE(MAX)
Maximum Current Sense Threshold
SENSE
–
< V
INTVCC
– 0.5V
SENSE
–
> V
INTVCC
+ 0.5V
FREQ = V
OUT–
V
SS
= 0V
V
FB
= 0.7V, V
SENSE–
= 3.3V
ILIM = FLOAT
ILIM = V
OUT–
ILIM = INTV
CC
V
DRVSET
= INTV
CC
l
l
l
55
20
4.2
7.8
4.0
7.0
1.3
1.3
µA
µA
V
V
V
V
V
mV
V
mV
µs
4.0
7.5
3.6
6.4
1.1
1.1
3.8
6.7
1.2
80
1.2
100
1
V
RUN
Rising with Respect to GND
V
OVLO
Rising with Respect to V
OUT–
l
Measured at V
FB
, Relative to Regulated V
FB
7
10
13
±1
±1
%
µA
µA
µA
%
µA
mV
mV
mV
Ω
Ω
850
98
8
66
43
90
99
10
75
50
100
2.2
1.0
12
84
57
109
Gate Driver
TG Pull-Up On-Resistance
TG Pull-Down On-Resistance
For more information
www.linear.com/LTC3896
3
3896f
LTC3896
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
= 12V, V
RUN
= 5V with respect to GND, EXTV
CC
=
0V, V
DRVSET
= 0V, VPRG = FLOAT unless otherwise noted. All pin voltages with respect to V
OUT–
, unless otherwise noted.
SYMBOL
PARAMETER
BG Pull-Up On-Resistance
BG Pull-Down On-Resistance
BOOST to DRV
CC
Switch On-Resistance
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
Bottom Gate Off to Top Gate On Delay Top
Switch-On Delay Time
t
ON(MIN)
TG Minimum On-Time
DRV
CC
Voltage from NDRV LDO Regulator
DRV
CC
Load Regulation from NDRV LDO
Regulator
DRV
CC
Voltage from Internal V
IN
LDO
DRV
CC
Load Regulation from V
IN
LDO
DRV
CC
Voltage from Internal EXTV
CC
LDO
DRV
CC
Load Regulation from Internal
EXTV
CC
LDO
EXTV
CC
LDO Switchover Voltage
EXTV
CC
Hysteresis
Programmable DRVCC
Programmable DRVCC
Programmable DRVCC
INTV
CC
LDO Regulator
V
INTVCC
INTV
CC
Voltage
Programmable Frequency
Programmable Frequency
Programmable Frequency
I
CC
= 0mA to 2mA
R
FREQ
= 25kΩ, PLLIN = DC Voltage
R
FREQ
= 65kΩ, PLLIN = DC Voltage
R
FREQ
= 105kΩ, PLLIN = DC Voltage
375
4.7
5.0
105
440
835
505
5.2
V
kHz
kHz
kHz
3896f
elecTrical characTerisTics
CONDITIONS
V
DRVSET
= INTV
CC
V
SW
= 0V, V
DRVSET
= INTV
CC
(Note 6) V
DRVSET
= INTV
CC
C
LOAD
= 3300pF
C
LOAD
= 3300pF
(Note 6) V
DRVSET
= INTV
CC
C
LOAD
= 3300pF
C
LOAD
= 3300pF
C
LOAD
= 3300pF each driver, V
DRVSET
= INTV
CC
C
LOAD
= 3300pF each driver, V
DRVSET
= INTV
CC
(Note 7) V
DRVSET
= INTV
CC
NDRV Driving External NFET, V
EXTVCC
= 0V
7V < V
IN
< 150V, DRVSET = V
OUT–
11V < V
IN
< 150V, DRVSET = INTVCC
NDRV Driving External NFET
I
CC
= 0mA to 50mA, V
EXTVCC
= 0V
NDRV = DRV
CC
(NDRV LDO Off), V
EXTVCC
= 0V
7V < V
IN
< 150V, DRVSET = V
OUT–
11V < V
IN
< 150V, DRVSET = INTV
CC
I
CC
= 0mA to 50mA, V
EXTVCC
= 0V
DRVSET = V
OUT
DRVSET = INTV
CC
7V < V
EXTVCC
< 13V, DRVSET = V
OUT–
11V < V
EXTVCC
< 13V, DRVSET = INTV
CC
I
CC
= 0mA to 50mA
DRVSET = V
OUT–
, V
EXTVCC
= 8.5V
DRVSET = INTV
CC
, V
EXTVCC
= 13V
EXTV
CC
Ramping Positive
DRVUV = V
OUT–
DRVUV = INTV
CC
, DRVSET = INTV
CC
R
DRVSET
= 50kΩ, NDRV Driving External NFET,
V
EXTVCC
= 0V
R
DRVSET
= 70kΩ, NDRV Driving External NFET,
V
EXTVCC
= 0V
R
DRVSET
= 90kΩ, NDRV Driving External NFET,
V
EXTVCC
= 0V
MIN
TYP
2.0
1.0
11
25
15
25
15
55
50
80
MAX
UNITS
Ω
Ω
Ω
ns
ns
ns
ns
ns
ns
ns
DRV
CC
LDO Regulator
5.8
9.6
6.0
10.0
0
5.6
9.5
5.85
9.85
1.4
0.9
5.8
9.6
6.0
10.0
0.7
0.5
4.5
7.4
4.7
7.7
250
5.0
6.4
7.0
9.0
7.6
6.2
10.4
1.0
6.1
10.3
2.5
2.0
6.2
10.4
2.0
2.0
4.9
8.0
V
V
%
V
V
%
%
V
V
%
%
V
V
mV
V
V
V
Oscillator and Phase-Locked Loop
4
For more information
www.linear.com/LTC3896
LTC3896
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
= 12V, V
RUN
= 5V with respect to V
OUT–
, EXTV
CC
=
0V, V
DRVSET
= 0V, VPRG = FLOAT unless otherwise noted. All pin voltages with respect to V
OUT–
, unless otherwise noted.
SYMBOL
PARAMETER
Low Fixed Frequency
High Fixed Frequency
f
SYNC
Synchronizable Frequency
PLLIN Input High Level
PLLIN Input Low Level
PGOOD Output
V
PGL
I
PGOOD
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
I
PGOOD
= 2mA, V
PGL
with Respect to GND
V
PGOOD
= 3.3V
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
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 Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC3896 is tested under pulsed load conditions such that T
J
≈
T
A
. The LTC3896E 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 LTC3896I is guaranteed over the
–40°C to 125°C operating junction temperature range and the LTC3896H
is guaranteed over the –40°C to 150°C operating junction temperature
range. 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. High temperatures degrade operating
lifetimes; operating lifetime is derated for junction temperatures greater
than 125°C. The junction temperature (T
J
, in °C) is calculated from the
ambient temperature (T
A
, in °C) and power dissipation (P
D
, in Watts)
according to the formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
where
θ
JA
= 28°C/W for the TSSOP package.
Note 3:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
–13
–10
2.5
10
2.5
40
0.02
0.04
10
–7
V
µA
%
%
%
%
µs
CONDITIONS
V
FREQ
= V
OUT–
, PLLIN = DC Voltage
V
FREQ
= INTV
CC
, PLLIN = DC Voltage
PLLIN = External Clock
PLLIN = External Clock with Respect to GND
PLLIN = External Clock with Respect to GND
l
l
l
elecTrical characTerisTics
MIN
320
485
75
2.8
TYP
350
535
MAX
380
585
850
0.5
UNITS
kHz
kHz
kHz
V
V
7
13
Note 4:
The LTC3896 is tested in a feedback loop that servos V
ITH
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
LTC3896E and LTC3896I, 150°C for the LTC3896H). For the LTC3896I
and LTC3896H, the specification at 0°C is note tested in production and is
assured by design, characterization and correlation to production testing
at –40°C.
Note 5:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See the Applications Information
section.
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).
Note 8:
Do not apply a voltage or current source to these pins. They must
be connected to capacitive loads only, otherwise permanent damage may
occur.
Note 9:
Do not apply a voltage or current source to the NDRV pin, other
than tying NDRV to DRV
CC
when not used. If used it must be connected
to capacitive loads only (see
DRV
CC
Regulators (OPTI-DRIVE)
in the
Applications Information section), otherwise permanent damage may
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