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LTC3826EUH#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LTC3826
1
3826fc
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
30µA I
Q
, Dual, 2-Phase
Synchronous Step-Down Controller
n
Automotive Systems
n
Battery-Operated Digital Devices
n
Distributed DC Power Systems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178, 5929620, 6177787, 6144194, 5408150, 6580258, 6304066, 5705919.
High Effi ciency Dual 8.5V/3.3V Step-Down Converter Effi ciency and Power Loss
vs Load Current
The LTC
®
3826 is a high performance dual step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant frequency
current mode architecture allows a phase-lockable fre-
quency of up to 650kHz. Power loss and noise due to the
ESR of the input capacitor are minimized by operating the
two controller output stages out of phase.
The 30μA no-load quiescent current extends operating
life in battery powered systems. OPTI-LOOP compensa-
tion allows the transient response to be optimized over
a wide range of output capacitance and ESR values. The
LTC3826 features a precision 0.8V reference and a power
good output indicator. A wide 4V to 36V input supply range
encompasses all battery chemistries.
Independent TRACK/SS pins for each controller ramp the
output voltage during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode opera-
tion, pulse skipping mode, or continuous inductor cur-
rent mode at light loads. For a leaded package version
(28-lead SSOP), see the LTC3826-1 data sheet.
n
Wide Output Voltage Range: 0.8V ≤ V
OUT
≤ 10V
n
Ultralow Operating I
Q
: 30μA (One Channel On)
n
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
n
OPTI-LOOP
®
Compensation Minimizes C
OUT
n
±1% Output Voltage Accuracy
n
Wide V
IN
Range: 4V to 36V Operation
n
Phase-Lockable Fixed Frequency 140kHz to 650kHz
n
Selectable Continuous, Pulse Skipping or Low Ripple
Burst Mode
®
Operation at Light Loads
n
Dual N-Channel MOSFET Synchronous Drive
n
Very Low Dropout Operation: 99% Duty Cycle
n
Adjustable Output Voltage Soft-Start or Tracking
n
Output Current Foldback Limiting
n
Power Good Output Voltage Monitor
n
Output Overvoltage Protection
n
Low Shutdown I
Q
: 4μA
n
Internal LDO Powers Gate Drive from V
IN
or V
OUT
n
Small 5mm × 5mm QFN Package
0.1μF
62.5k
3.3μH
220pF
150μF
4.7μF
22μF
50V
0.015Ω
20k
15k
V
OUT1
3.3V
5A
150μF
0.1μF
192.5k
7.2μH
220pF
0.015Ω
20k
15k
V
OUT2
8.5V
3.5A
TG1 TG2
BOOST1 BOOST2
SW1 SW2
BG1 BG2
SGND
PGND
SENSE1
+
SENSE2
+
SENSE1
–
SENSE2
–
V
FB1
V
FB2
I
TH1
I
TH2
V
IN
INTV
CC
TRACK/SS1 TRACK/SS2
V
IN
4V TO 36V
3826 TA01
0.1μF
0.1μF
LTC3826
OUTPUT CURRENT (A)
0.00001 0.0001
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
0.001 0.01 0.1 1 10
3826 TA01b
30
20
10
0
90
100
1
10
1000
100
0.1
10000
FIGURE 13 CIRCUIT
LTC3826
2
3826fc
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage (V
IN
) ......................... 36V to –0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ............................... 42V to –0.3V
Switch Voltage (SW1, SW2) ......................... 36V to –5V
(BOOST1-SW1), (BOOST2-SW2) ............. 8.5V to –0.3V
RUN1, RUN2 ............................................... 7V to –0.3V
SENSE1
+
, SENSE2
+
, SENSE1
–
,
SENSE2
–
Voltages ................................ 11V to –0.3V
PLLIN/MODE, PLLLPF, Voltages ........... INTV
CC
to –0.3V
PHASMD, FOLDDIS, TRACK/SS1, TRACK/SS2
Voltages ........................................... INTV
CC
to –0.3V
EXTV
CC
...................................................... 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
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3826EUH#PBF LTC3826EUH#TRPBF 3826 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C
LTC3826IUH#PBF LTC3826IUH#TRPBF 3826 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C
LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3826EUH LTC3826EUH#TR 3826 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C
LTC3826IUH LTC3826IUH#TR 3826 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
32 31 30 29 28 27 26 25
9 10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1
TOP VIEW
SENSE1
–
PLLLPF
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN1
RUN2
BOOST1
BG1
V
IN
PGND
EXTV
CC
INTV
CC
BG2
BOOST2
SENSE1
+
V
FB1
I
TH1
TRACK/SS1
PGOOD2
PGOOD1
TG1
SW1
SENSE2
–
SENSE2
+
V
FB2
I
TH2
TRACK/SS2
FOLDDIS
TG2
SW2
UH PACKAGE 32-LEAD (5mm s 5mm) PLASTIC QFN
T
JMAX
= 125°C, Q
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
33
LTC3826
3
3826fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 12V, V
RUN/SS1, 2
= 5V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loops
V
FB1, 2
Regulated Feedback Voltage (Note 4); I
TH1, 2
Voltage = 1.2V
l
0.792 0.800 0.808 V
I
VFB1, 2
Feedback Current (Note 4) –5 –50 nA
V
REFLNREG
Reference Voltage Line Regulation V
IN
= 4V to 30V (Note 4) 0.002 0.02 %/V
V
LOADREG
Output Voltage Load Regulation (Note 4)
Measured in Servo Loop; ΔI
TH
Voltage = 1.2V to 0.7V
Measured in Servo Loop; ΔITH Voltage = 1.2V to 2V
l
l
0.1
–0.1
0.5
–0.5
%
%
g
m1, 2
Transconductance Amplifi er g
m
I
TH1, 2
= 1.2V; Sink/Source 5mA (Note 4) 0.5 mmho
I
Q
Input DC Supply Current
Sleep Mode (Channel 1 On)
Sleep Mode (Channel 2 On)
Shutdown
Sleep Mode (Both Channels)
(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
30
30
4
50
50
50
10
75
μA
μA
μA
μA
UVLO Undervoltage Lockout V
IN
Ramping Down
l
3.7 4 V
V
OVL
Feedback Overvoltage Lockout Measured at V
FB1, 2
, Relative to Regulated V
FB1, 2
81012 %
I
SENSE
Sense Pins Total Source Current (Each Channel) V
SENSE1
–,
2
– = V
SENSE1
+,
2
+ = 0V –220 μA
DF
MAX
Maximum Duty Factor In Dropout 98 99.4 %
I
TRACK/SS1, 2
Soft-Start Charge Current V
TRACK1, 2
= 0V 0.75 1 1.35 μA
V
RUN1, 2
ON RUN Pin ON Threshold V
RUN1
, V
RUN2
Rising 0.5 0.7 0.9 V
V
SENSE(MAX)
Maximum Current Sense Threshold V
FB1, 2
= 0.7V, V
SENSE1
–,
2
– = 3.3V
l
85 100 115 mV
TG1, 2 t
r
TG1, 2 t
f
TG Transition Time:
Rise Time
Fall Time
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
50
50
90
90
ns
ns
BG1, 2 t
r
BG1, 2 t
f
BG Transition Time:
Rise Time
Fall Time
(Note 6)
C
LOAD
= 3300pF
C
LOAD
= 3300pF
40
40
90
80
ns
ns
TG/BG t
1D
Top Gate Off to Bottom Gate On Delay
Synchronous Switch-On Delay Time
C
LOAD
= 3300pF Each Driver 70 ns
BG/TG t
2D
Bottom Gate Off to Top Gate On Delay
Top Switch-On Delay Time
C
LOAD
= 3300pF Each Driver 70 ns
t
ON(MIN)
Minimum On-Time (Note 7) 230 ns
INTV
CC
Linear Regulator
V
INTVCCVIN
Internal V
CC
Voltage 8.5V < V
IN
< 30V, V
EXTVCC
= 0V 5.0 5.25 5.5 V
V
LDOVIN
INTV
CC
Load Regulation I
CC
= 0mA to 20mA, V
EXTVCC
= 0V 0.2 1.0 %
V
INTVCCEXT
Internal V
CC
Voltage V
EXTVCC
= 8.5V 7.2 7.5 7.8 V
V
LDOEXT
INTV
CC
Load Regulation I
CC
= 0mA to 20mA, V
EXTVCC
= 8.5V 0.2 1.0 %
V
EXTVCC
EXTV
CC
Switchover Voltage EXTV
CC
Ramping Positive 4.5 4.7 V
V
LDOHYS
EXTV
CC
Hysteresis 0.2 V
Oscillator and Phase-Locked Loop
f
NOM
Nominal Frequency V
PLLLPF
= Floating; PLLIN/MODE = DC Voltage 350 390 430 kHz
f
LOW
Lowest Frequency V
PLLLPF
= 0V; PLLIN/MODE = DC Voltage 220 250 280 kHz
f
HIGH
Highest Frequency V
PLLLPF
= INTV
CC
; PLLIN/MODE = DC Voltage 475 530 585 kHz
f
SYNCMIN
Minimum Synchronizable Frequency PLLIN/MODE = External Clock; V
PLLLPF
= 0V 115 140 kHz
f
SYNCMAX
Maximum Synchronizable Frequency PLLIN/MODE = External Clock; V
PLLLPF
= 2V 650 800 kHz
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LTC3826EUH#PBF

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Buy LTC3826EUH#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Ultra Low Iq, Dual, 2-Phase Synch Step Down Controller
Lifecycle:
New from this manufacturer.
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