...................................................... 10V to –0.3V
I
TH1
, I
TH2
, V
FB1
, V
FB2
Voltages ................. 2.7V to –0.3V
PGOOD1, PGOOD2 Voltages ..................... 8.5V to –0.3V
Peak Output Current <10μs (TG1, TG2, BG1, BG2) .....3A
Operating Temperature Range (Note 2).... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range .................. –65°C to 125°C
32 31 30 29 28 27 26 25
SENSE1
–
1
PLLLPF 2
PHASMD 3
CLKOUT 4
PLLIN/MODE 5
SGND 6
RUN1 7
RUN2 8
9 10 11 12 13 14 15 16
SENSE2
–
SENSE2
+
V
FB2
I
TH2
FOLDDIS
TG2
TRACK/SS2
SW2
33
24 BOOST1
23 BG1
22 V
IN
21 PGND
20 EXTV
CC
19 INTV
CC
18 BG2
17 BOOST2
UH PACKAGE 32-LEAD (5mm 5mm) PLASTIC QFN
T
JMAX
= 125°C,
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3826EUH#PBF
LTC3826IUH#PBF
LEAD BASED FINISH
LTC3826EUH
LTC3826IUH
TAPE AND REEL
LTC3826EUH#TRPBF
LTC3826IUH#TRPBF
TAPE AND REEL
LTC3826EUH#TR
LTC3826IUH#TR
PART MARKING*
3826
3826
PART MARKING*
3826
3826
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
PACKAGE DESCRIPTION
32-Lead (5mm
×
5mm) Plastic QFN
32-Lead (5mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°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/
SW1
V
FB1
I
TH1
TG1
3826fc
2
LTC3826
ELECTRICAL CHARACTERISTICS
SYMBOL
V
FB1, 2
I
VFB1, 2
V
REFLNREG
V
LOADREG
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
Main Control Loops
(Note 4); I
TH1, 2
Voltage = 1.2V
(Note 4)
V
IN
= 4V to 30V (Note 4)
(Note 4)
Measured in Servo Loop;
ΔI
TH
Voltage = 1.2V to 0.7V
Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V
I
TH1, 2
= 1.2V; Sink/Source 5mA (Note 4)
(Note 5)
RUN1 = 5V, RUN2 = 0V, V
FB1
= 0.83V (No Load)
RUN1 = OV, RUN2 = 5V, V
FB2
= 0.83V (No Load)
V
RUN1, 2
= 0V
RUN1,2 = 5V, V
FB1
= V
FB2
= 0.83V
V
IN
Ramping Down
Measured at V
FB1, 2
, Relative to Regulated V
FB1, 2
(Each Channel) V
SENSE1
–,
2
– = V
SENSE1
+,
2
+ = 0V
In Dropout
V
TRACK1, 2
= 0V
V
RUN1
, V
RUN2
Rising
V
FB1, 2
= 0.7V, V
SENSE1
–,
2
– = 3.3V
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN/SS1, 2
= 5V unless otherwise noted.
CONDITIONS
MIN
0.792
TYP
0.800
–5
0.002
0.1
–0.1
0.5
30
30
4
50
3.7
8
98
0.75
0.5
85
10
–220
99.4
1
0.7
100
50
50
40
40
70
70
230
5.0
7.2
4.5
5.25
0.2
7.5
0.2
4.7
0.2
V
PLLLPF
= Floating; PLLIN/MODE = DC Voltage
V
PLLLPF
= 0V; PLLIN/MODE = DC Voltage
V
PLLLPF
= INTV
CC
; PLLIN/MODE = DC Voltage
PLLIN/MODE = External Clock; V
PLLLPF
= 0V
PLLIN/MODE = External Clock; V
PLLLPF
= 2V
650
350
220
475
390
250
530
115
800
430
280
585
140
5.5
1.0
7.8
1.0
1.35
0.9
115
90
90
90
80
50
50
10
75
4
12
MAX
0.808
–50
0.02
0.5
–0.5
UNITS
V
nA
%/V
%
%
mmho
μA
μA
μA
μA
V
%
μA
%
μA
V
mV
ns
ns
ns
ns
ns
ns
ns
V
%
V
%
V
V
kHz
kHz
kHz
kHz
kHz
g
m1, 2
I
Q
Transconductance Amplifier g
m
Input DC Supply Current
Sleep Mode (Channel 1 On)
Sleep Mode (Channel 2 On)
Shutdown
Sleep Mode (Both Channels)
Undervoltage Lockout
Feedback Overvoltage Lockout
Sense Pins Total Source Current
Maximum Duty Factor
RUN Pin ON Threshold
TG Transition Time:
Rise Time
Fall Time
BG Transition Time:
Rise Time
Fall Time
UVLO
V
OVL
I
SENSE
DF
MAX
V
RUN1, 2
ON
I
TRACK/SS1, 2
Soft-Start Charge Current
V
SENSE(MAX)
Maximum Current Sense Threshold
TG1, 2 t
r
TG1, 2 t
f
BG1, 2 t
r
BG1, 2 t
f
TG/BG t
1D
BG/TG t
2D
t
ON(MIN)
V
INTVCCVIN
V
LDOVIN
V
INTVCCEXT
V
LDOEXT
V
EXTVCC
V
LDOHYS
f
NOM
f
LOW
f
HIGH
f
SYNCMIN
f
SYNCMAX
Top Gate Off to Bottom Gate On Delay C
LOAD
= 3300pF Each Driver
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay C
LOAD
= 3300pF Each Driver
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
Nominal Frequency
Lowest Frequency
Highest Frequency
Minimum Synchronizable Frequency
Maximum Synchronizable Frequency
(Note 7)
8.5V < V
IN
< 30V, V
EXTVCC
= 0V
I
CC
= 0mA to 20mA, V
EXTVCC
= 0V
V
EXTVCC
= 8.5V
I
CC
= 0mA to 20mA, V
EXTVCC
= 8.5V
EXTV
CC
Ramping Positive
INTV
CC
Linear Regulator
Oscillator and Phase-Locked Loop
3826fc
3
LTC3826
ELECTRICAL CHARACTERISTICS
SYMBOL
I
PLLLPF
PARAMETER
Phase Detector Output Current
Sinking Capability
Sourcing Capability
PGOOD Voltage Low
PGOOD Leakage Current
PGOOD Trip Level
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, V
RUN/SS1, 2
= 5V unless otherwise noted.
CONDITIONS
f
PLLIN/MODE
< f
OSC
f
PLLIN/MODE
> f
OSC
I
PGOOD
= 2mA
V
PGOOD
= 5V
V
FB
with Respect to Set Regulated Voltage
V
FB
Ramping Negative
V
FB
Ramping Positive
–12
8
–10
10
MIN
TYP
–5
5
0.1
0.3
±1
–8
12
MAX
UNITS
μA
μA
V
μA
%
%
PGOOD Output
V
PGL
I
PGOOD
V
PG
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 LTC3826E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls. The LTC3826I is guaranteed to meet
performance specifications over the full –40°C to 85°C operating
temperature range.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formulas:
T
J
= T
A
+ (P
D
• 34 °C/W)
Note 4:
The LTC3826 is tested in a feedback loop that servos V
ITH1, 2
to a
specified voltage and measures the resultant V
FB1, 2
.
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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