RUN1, RUN2 Voltages ................................ –0.3V to 65V
SENSE1
+
, SENSE2
+
, SENSE1
–
SENSE2
–
Voltages ..................................... –0.3V to 65V
PLLIN/MODE, FREQ, DRVSET Voltages ....... –0.3V to 6V
EXTV
CC
Voltage ......................................... –0.3V to 14V
ITH1, ITH2, V
FB1
Voltages ............................ –0.3V to 6V
V
FB2
Voltage............................................... –0.3V to 65V
VPRG2 Voltage ............................................ –0.3V to 6V
TRACK/SS1, SS2 Voltages ........................... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC7813E, LTC7813I .......................... –40°C to 125°C
LTC7813H .......................................... –40°C to 150°C
LTC7813MP ....................................... –55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
32 31 30 29 28 27 26 25
SW1 1
TG1 2
TRACK/SS1 3
VPRG2 4
I
TH1
5
V
FB1
6
SENSE1
+
SENSE1
–
7
8
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 44°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC7813EUH#PBF
LTC7813IUH#PBF
LTC7813HUH#PBF
LTC7813MPUH#PBF
TAPE AND REEL
LTC7813EUH#TRPBF
LTC7813IUH#TRPBF
LTC7813HUH#TRPBF
LTC7813MPUH#TRPBF
PART MARKING*
7813
7813
7813
7813
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.
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/
V
BIAS
SW2
BG1
BG2
TG2
2
7813f
For more information
www.linear.com/LTC7813
LTC7813
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
BIAS
= 12V, V
RUN1,2
= 5V, V
EXTVCC
= 0V, V
DRVSET
= 0V,
VPRG2 = 0V unless otherwise noted.
SYMBOL
V
BIAS
V
OUT1
V
OUT2
V
SENSE2(CM)
V
FB1
V
FB2
PARAMETER
Bias Input Supply Operating Voltage Range
Buck Regulated Output Voltage Set Point
Boost Regulated Output Voltage Set Point
SENSE2 Pins Common Mode Range
(BOOST Converter Input Supply Voltage)
Buck Regulated Feedback Voltage
(Note 4) ITH1 Voltage = 1.2V
0°C to 85°C
l
elecTrical characTerisTics
CONDITIONS
MIN
4.5
0.8
2.2
TYP
MAX
60
60
60
60
UNITS
V
V
V
V
0.792
0.788
1.182
9.78
11.74
0.800
0.800
1.200
10.00
12.00
–2
±0.01
4
5
0.002
0.808
0.812
1.218
10.22
12.26
±50
±0.05
6
7
0.02
0.1
–0.1
V
V
V
V
V
nA
µA
µA
µA
%/V
%
%
mmho
mA
mA
mA
Boost Regulated Feedback Voltage
(Note 4) ITH2 Voltage = 1.2V
VPRG2 = 0V
VPRG2 = FLOAT
VPRG2 = INTV
CC
(Note 4)
(Note 4)
VPRG2 = 0V
VPRG2 = FLOAT
VPRG2 = INTV
CC
(Note 4) V
BIAS
= 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
l
l
I
FB1
I
FB2
Buck Feedback Current
Boost Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
l
l
0.01
–0.01
2
1.6
0.8
2.2
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, Buck)
Sleep Mode (One Channel On, Boost)
Sleep Mode (Both Channels On)
Shutdown
(Note 4) ITH1,2 = 1.2V, Sink/Source 5µA
(Note 5), V
DRVSET
= 0V
RUN1 = 5V and RUN2 = 0V or
RUN2 = 5V and RUN1 = 0V
V
FB1
= 0.83V (No Load), V
FB2
= 1.25V (No Load)
RUN1,2 = 5V, V
FB1
= 0.83V (No Load),
V
FB2
= 1.25V (No Load)
RUN1 = 5V and RUN2 = 0V
V
FB1
= 0.83V (No Load)
RUN2 = 5V and RUN1 = 0V, V
FB2
= 1.25V (No Load)
RUN1 = 5V and RUN2 = 5V,
V
FB1
= 0.83V (No Load), V
FB2
= 1.25V (No Load)
RUN1,2 = 0V
DRV
CC
Ramping Up
DRVUV = 0V
DRVUV = INTV
CC
DRV
CC
Ramping Down
DRVUV = 0V
DRVUV = INTV
CC
l
l
l
l
l
29
29
34
3.6
4.0
7.5
3.6
6.4
7
3.8
6.7
10
170
55
50
55
10
4.2
7.8
4.0
7.0
13
±1
µA
µA
µA
µA
V
V
V
V
%
µA
µA
µA
µA
µA
UVLO
Undervoltage Lockout
Buck Feedback Overvoltage Protection
SENSE1
+
Pin Current
SENSE2
+
Pin Current
SENSE1
–
Pin Current
SENSE2
–
Pin Current
Measured at V
FB1
Relative to Regulated V
FB1
V
SENSE1
– < V
INTVCC
– 0.5V
V
SENSE1
– > V
INTVCC
+ 0.5V
V
SENSE2
+, V
SENSE2
– = 12V
700
±1
±1
For more information
www.linear.com/LTC7813
3
7813f
LTC7813
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
BIAS
= 12V, V
RUN1,2
= 5V, V
EXTVCC
= 0V, V
DRVSET
= 0V,
VPRG2 = 0V unless otherwise noted.
SYMBOL
PARAMETER
Maximum Duty Factor for TG
Maximum Duty Factor for BG
I
TRACK/SS1
I
SS2
V
RUN1,2
ON
Soft-Start Charge Current
Soft-Start Charge Current
RUN Pin On Threshold
RUN Pin Hysteresis
V
SENSE1,2(MAX)
Maximum Current Sense Threshold
Gate Driver
TG1,2
BG1,2
Pull-Up On-Resistance
Pull-Down On-Resistance
Pull-Up On-Resistance
Pull-Down On-Resistance
BOOST1,2 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)1
t
ON(MIN)2
Buck Minimum On-Time
Boost Minimum On-Time
DRV
CC
Voltage from Internal V
BIAS
LDO
DRV
CC
Load Regulation from V
BIAS
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
R
DRVSET
= 50kΩ, V
EXTVCC
= 0V
R
DRVSET
= 70kΩ, V
EXTVCC
= 0V
R
DRVSET
= 90kΩ, V
EXTVCC
= 0V
6.4
V
DRVSET
= INTV
CC
V
DRVSET
= INTV
CC
V
SW1,2
= 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
Buck (Channel 1)
Boost (Channel 2)
C
LOAD
= 3300pF Each Driver, V
DRVSET
= INTV
CC
Buck (Channel 1)
Boost (Channel 2)
(Note 7) V
DRVSET
= INTV
CC
(Note 7) V
DRVSET
= INTV
CC
V
EXTVCC
= 0V
7V < V
BIAS
< 60V, DRVSET = 0V
11V < V
BIAS
< 60V, DRVSET = INTV
CC
I
CC
= 0mA to 50mA, V
EXTVCC
= 0V
7V < V
EXTVCC
< 13V, DRVSET = 0V
11V < V
EXTVCC
< 13V, DRVSET = INTV
CC
I
CC
= 0mA to 50mA, V
EXTVCC
= 8.5V,
V
DRVSET
= 0V
EXTV
CC
Ramping Positive
DRVSET = 0V or R
DRVSET
≤ 100kΩ
DRVSET = INTV
CC
4.5
7.4
5.8
9.6
2.2
1.0
2.2
1.0
3.7
25
15
25
15
55
85
50
80
80
120
Ω
Ω
Ω
Ω
Ω
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
I
LIM
= Float
I
LIM
= 0V
I
LIM
= INTV
CC
l
l
l
elecTrical characTerisTics
CONDITIONS
Buck (Channel 1) in Dropout, FREQ = 0V
Boost (Channel 2)
Buck (Channel 1) in Overvoltage
Boost (Channel 2)
V
TRACK/SS1
= 0V
V
SS2
= 0V
V
RUN1
, V
RUN2
Rising
l
MIN
97.5
TYP
99
100
100
96
MAX
UNITS
%
%
%
%
8
8
1.22
65
43
90
10
10
1.275
75
75
50
100
12
12
1.33
85
58
109
µA
µA
V
mV
mV
mV
mV
DRV
CC
Linear Regulator
5.8
9.6
6.0
10.0
0.9
6.0
10.0
0.7
6.2
10.4
2.0
6.2
10.4
2.0
V
V
%
V
V
%
4.7
7.7
250
5.0
7.0
9.0
4.9
8.0
V
V
mV
V
7.6
V
V
7813f
4
For more information
www.linear.com/LTC7813
LTC7813
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
BIAS
= 12V, V
RUN1,2
= 5V, V
EXTVCC
= 0V, V
DRVSET
= 0V,
VPRG2 = 0V unless otherwise noted.
SYMBOL
PARAMETER
Programmable Frequency
Programmable Frequency
Programmable Frequency
Low Fixed Frequency
High Fixed Frequency
Synchronizable Frequency
PLLIN V
IH
PLLIN V
IL
PLLIN/MODE Input High Level
PLLIN/MODE Input Low Level
BOOST2 Charge Pump Available Output
Current
CONDITIONS
R
FREQ
=25kΩ, PLLIN/MODE = DC Voltage
R
FREQ
= 65kΩ, PLLIN/MODE = DC Voltage
R
FREQ
= 105kΩ, PLLIN/MODE = DC Voltage
V
FREQ
= 0V, PLLIN/MODE = DC Voltage
V
FREQ
= INTV
CC
, PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock
PLLIN/MODE = External Clock
PLLIN/MODE = External Clock
FREQ = 0V, PLLIN/MODE = INTV
CC
V
BOOST2
= 16.5V, V
SW2
= 12V
V
BOOST2
= 19V, V
SW2
= 12V
l
l
l
elecTrical characTerisTics
Oscillator and Phase-Locked Loop
MIN
TYP
105
MAX
UNITS
kHz
375
320
485
75
2.5
440
835
350
535
505
380
585
850
0.5
kHz
kHz
kHz
kHz
kHz
V
V
BOOST2 Charge Pump
75
35
µA
µA
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 LTC7813 is tested under pulsed load conditions such that
T
J
≈ T
A
. The LTC7813E 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 LTC7813I is guaranteed
over the –40°C to 125°C operating junction temperature range, the
LTC7813H is guaranteed over the –40°C to 150°C operating junction
temperature range and the LTC7813MP 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. 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
= 44°C.
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.
Note 4:
The LTC7813 is tested in a feedback loop that servos V
ITH1,2
to a
specified voltage and measures the resultant V
FB1,2
. 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 LTC7813E and LTC7813I, 150°C for the LTC7813H and LTC7813MP).
For the LTC7813I and LTC7813H, the specification at 0°C is not tested in
production and is assured by design, characterization and correlation to
production testing at –40°C. For the LTC7813MP, the specification at 0°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).
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
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