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)
LTC7801E, LTC7801I .......................... –40°C to 125°C
LTC7801H .......................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
pin conFiguraTion
TOP VIEW
SENSE
–
SS
V
FB
ITH
MODE
GND
CRUMP_EN
PLLIN
PGOOD
1
2
3
4
5
6
7
8
9
25
24 SENSE
+
22 INTV
CC
21 RUN
20 EXTV
CC
19 V
IN
18 NDRV
17 DRV
CC
16 BG
15 BOOST
14 SW
13 TG
TOP VIEW
SENSE
–
SENSE
+
INTV
CC
19 RUN
18 EXTV
CC
17 V
IN
25
16 NDRV
15 DRV
CC
14 BG
8
FREQ
9 10 11 12
DRVUV
DRVSET
SW
TG
13 BOOST
OVLO
V
FB
1
ITH 2
MODE 3
GND 4
CPUMP_EN 5
PLLIN 6
PGOOD 7
FREQ 10
DRVSET 11
DRVUV 12
FE PACKAGE
24-LEAD PLASTIC TSSOP
UFD PACKAGE
24-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 33°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE
SOLDERED TO PCB FOR RATED ELECTRICAL AND
THERMAL CHARACTERISTICS
T
JMAX
= 150°C,
θ
JA
= 43°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE
SOLDERED TO PCB FOR RATED ELECTRICAL AND
THERMAL CHARACTERISTICS
orDer inForMaTion
LEAD FREE FINISH
LTC7801EFE#PBF
LTC7801IFE#PBF
LTC7801HFE#PBF
LTC7801EUFD#PBF
LTC7801IUFD#PBF
LTC7801HUFD#PBF
TAPE AND REEL
LTC7801EFE#TRPBF
LTC7801IFE#TRPBF
LTC7801HFE#TRPBF
LTC7801EUFD#TRPBF
LTC7801IUFD#TRPBF
LTC7801HUFD#TRPBF
http://www.linear.com/product/LTC7801#orderinfo
PART MARKING
LTC7801FE
LTC7801FE
LTC7801FE
7801
7801
7801
PACKAGE DESCRIPTION
24-Lead Plastic TSSOP
24-Lead Plastic TSSOP
24-Lead Plastic TSSOP
24-Lead (4mm × 5mm) Plastic QFN
24-Lead (4mm × 5mm) Plastic QFN
24-Lead (4mm × 5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
–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.
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.
7801f
2
For more information
www.linear.com/LTC7801
SS
23 OVLO
24 23 22 21 20
LTC7801
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, V
EXTVCC
= 0V, V
DRVSET
= 0V
unless otherwise noted.
SYMBOL
V
IN
V
OUT
V
FB
I
FB
PARAMETER
Regulated Output Voltage Set Point
Regulated Feedback Voltage
(Note 4); ITH Voltage = 1.2V
0°C to 85°C
l
elecTrical characTerisTics
CONDITIONS
l
MIN
4
0.8
0.792
0.788
TYP
MAX
140
60
UNITS
V
V
V
V
µA
%/V
%
%
mmho
mA
Input Supply Operating Voltage Range (Note 10) DRVUV = 0V
0.800
0.800
–0.006
0.002
0.808
0.812
±0.050
0.02
0.1
–0.1
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
(Note 4)
(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
l
l
0.01
–0.01
2
2.5
40
10
g
m
I
Q
Transconductance Amplifier gm
Input DC Supply Current
(Note 4) ITH = 1.2V, Sink/Source 5µA
(Note 5) V
DRVSET
= 0V
Pulse Skip or Forced Continuous Mode V
FB
= 0.83V (No Load)
Sleep Mode
V
FB
= 0.83V (No Load)
Shutdown
UVLO
Undervoltage Lockout
RUN = 0V
DRV
CC
Ramping Up
DRVUV = 0V
DRVUV = INTV
CC
, DRVSET = INTV
CC
DRV
CC
Ramping Down
DRVUV = 0V
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
SENSE
–
< V
INTVCC
– 0.5V
SENSE
–
> V
INTVCC
+ 0.5V
In Dropout
CPUMP_EN = 0V, FREQ = 0V
CPUMP_EN = INTV
CC
V
SS
= 0V
V
FB
= 0.7V, V
SENSE
– = 3.3V
l
l
l
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
V
OVLO
Rising
l
Measured at V
FB
, Relative to Regulated V
FB
7
10
13
±1
±1
%
µA
µA
µA
%
850
98
100
8
66
99
10
75
I
SS
Soft-Start Charge Current
12
84
µA
mV
V
SENSE(MAX)
Maximum Current Sense Threshold
7801f
For more information
www.linear.com/LTC7801
3
LTC7801
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, V
EXTVCC
= 0V, V
DRVSET
= 0V
unless otherwise noted.
SYMBOL
Gate Driver
TG Pull-up On-Resistance
TG Pull-down On-Resistance
BG Pull-up On-Resistance
BG Pull-down 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)
I
CPUMP
TG Minimum On-Time
Charge Pump Output Current
Charge Pump for High Side Driver Supply
V
BOOST
=16V, V
SW
= 12V, V
FREQ
= 0V
V
BOOST
=19V, V
SW
= 12V, V
FREQ
= 0V
NDRV Driving External NFET, V
EXTVCC
= 0V
7V < V
IN
< 150V, DRVSET = 0V
11V < V
IN
< 150V, DRVSET = INTV
CC
NDRV Driving External NFET
I
CC
= 0mA to 50mA, V
EXTVCC
= 0V
NDRV = DRV
CC
, V
EXTVCC
= 0V
7V < V
IN
< 150V, DRVSET = 0V
11V < V
IN
< 150V, DRVSET = INTV
CC
I
CC
= 0mA to 50mA, V
EXTVCC
= 0V
DRVSET = 0V
DRVSET = INTV
CC
7V < V
EXTVCC
< 13V, DRVSET = 0V
11V < V
EXTVCC
< 13V, DRVSET = INTV
CC
I
CC
= 0mA to 50mA
DRVSET = 0V, V
EXTVCC
= 8.5V
DRVSET = INTV
CC
, V
EXTVCC
= 13V
EXTV
CC
Ramping Positive
DRVUV = 0V
DRVUV = INTV
CC
, DRVSET = INTV
CC
R
DRVSET
= 50k
NDRV Driving External NFET, V
EXTVCC
= 0V
R
DRVSET
= 70k
NDRV Driving External NFET, V
EXTVCC
= 0V
R
DRVSET
= 90k
NDRV Driving External NFET, V
EXTVCC
= 0V
6.4
4.5
7.4
5.8
9.6
5.6
9.5
65
55
µA
µA
V
DRVSET
= INTV
CC
V
DRVSET
= INTV
CC
2.2
1.0
2.0
1.0
11
25
15
25
15
55
50
80
Ω
Ω
Ω
Ω
Ω
ns
ns
ns
ns
ns
ns
ns
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
elecTrical characTerisTics
BOOST to DRV
CC
Switch On-Resistance 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
DRV
CC
LDO Regulator
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 DRV
CC
Programmable DRV
CC
Programmable DRV
CC
5.8
9.6
6.0
10.0
0
5.85
9.85
1.4
0.9
6.0
10.0
0.7
0.5
4.7
7.7
250
5.0
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
7801f
4
For more information
www.linear.com/LTC7801
LTC7801
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, V
EXTVCC
= 0V, V
DRVSET
= 0V
unless otherwise noted.
SYMBOL
V
INTVCC
PARAMETER
INTV
CC
Voltage
Programmable Frequency
Programmable Frequency
Programmable Frequency
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
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 Ratings for extended periods may affect device reliability and
lifetime.
Note 2:
The LTC7801 is tested under pulsed load conditions such that T
J
≈
T
A
. The LTC7801E 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 LTC7801I is guaranteed over the
–40°C to 125°C operating junction temperature range and the LTC7801H
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 125ºC. 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
= 33°C/W for the TSSOP package and
θ
JA
= 43°C/W for the
QFN 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
–13
–10
2.5
10
2.5
40
0.02
0.04
10
–7
V
µA
%
%
%
%
µs
CONDITIONS
I
CC
= 0mA to 2mA
R
FREQ
= 25k, PLLIN = DC Voltage
R
FREQ
= 65k, PLLIN = DC Voltage
R
FREQ
=105k, PLLIN = DC Voltage
V
FREQ
= 0V, PLLIN = DC Voltage
V
FREQ
= INTV
CC
, PLLIN = DC Voltage
PLLIN = External Clock
PLLIN = External Clock
PLLIN = External Clock
l
l
l
elecTrical characTerisTics
INTV
CC
LDO Regulator
MIN
4.7
TYP
5.0
105
MAX
5.2
UNITS
V
kHz
Oscillator and Phase-Locked Loop
375
320
485
75
2.8
440
835
350
535
380
585
850
0.5
505
kHz
kHz
kHz
kHz
kHz
V
V
7
13
junction temperature may impair device reliability or permanently damage
the device.
Note 4:
The LTC7801 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
LTC7801E and LTC7801I, 150°C for the LTC7801H). For the LTC7801I
and LTC7801H, the specification at 0°C is not 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 in the Applications
Information section), otherwise permanent damage may occur.
Note 10:
The minimum input supply operating range is dependent on the
DRV
CC
UVLO thresholds as determined by the DRVUV pin setting.
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