LTC3826-1
30µA I , Dual, 2-Phase
Q
Synchronous Step-Down Controller
FEATURES
DESCRIPTION
The LTC®3826-1 is a high performance dual step-down
switching regulator controller that drives all N-channel
synchronouspowerMOSFETstages.Aconstantfrequency
current mode architecture allows a phase-lockable fre-
quency of up to 650kHz. Power loss and noise due to the
ESRoftheinputcapacitorESRareminimizedbyoperating
the two controller output stages out of phase.
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Wide Output Voltage Range: 0.8V ≤ V
≤ 10V
OUT
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Low Operating I : 30μA (One Channel On)
Q
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Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP® Compensation Minimizes C
n
n
n
n
n
OUT
1ꢀ Output Voltage Accuracy
Wide V Range: 4V to 36V Operation
IN
Phase-Lockable Fixed Frequency 140kHz to 650kHz
Selectable Continuous, Pulse Skipping or Low Ripple
Burst Mode® Operation at Light Loads
Dual N-Channel MOSFET Synchronous Drive
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Output Current Foldback Limiting
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
LTC3826-1featuresaprecision0.8Vreferenceandapower
goodoutputindicator. Awide4Vto36Vinputsupplyrange
encompasses all battery chemistries.
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n
n
n
n
n
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Power Good Output Voltage Monitor
Independent TRACK/SS pins for each controller ramp the
output voltage during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit conditions.
Output Overvoltage Protection
Low Shutdown I : 4μA
Q
Internal LDO Powers Gate Drive from V or V
IN
OUT
The PLLIN/MODE pin selects among Burst Mode opera-
tion, pulse skipping mode, or continuous inductor cur-
rent mode at light loads. For a leadless package version
(5mm × 5mm QFN) with additional features, see the
LTC3826 data sheet.
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.
Small 28-Lead SSOP Package
APPLICATIONS
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Automotive Systems
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Battery-Operated Digital Devices
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Distributed DC Power Systems
TYPICAL APPLICATION
High Efficiency Dual 8.5V/3.3V Step-Down Converter
V
Efficiency and Power Loss
IN
4V TO 36V
vs Load Current
22μF
4.7μF
50V
100
90
10000
1000
100
10
V
INTV
CC
IN
TG1
TG2
0.1μF
BOOST1
SW1
BOOST2
SW2
80
7.2μH
3.3μH
0.1μF
70
BG1
BG2
60
50
LTC3826-1
PGND
+
40
30
20
10
0
+
SENSE1
SENSE1
SENSE2
0.015Ω
192.5k
0.015Ω
1
–
–
SENSE2
V
V
8.5V
3.5A
OUT1
3.3V
5A
OUT2
V
FB1
V
FB2
FIGURE 13 CIRCUIT
62.5k
0.1
I
I
TH2
TH1
TRACK/SS1 SGND TRACK/SS2
0.1μF
0.00001 0.0001 0.001 0.01
0.1
1
10
220pF
15k
220pF
15k
150μF
150μF
20k
OUTPUT CURRENT (A)
20k
38261 TA01b
0.1μF
38261 TA01
38261fb
1
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