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Linear Technology Electronic Components Datasheet

LTC3826IG-1 Datasheet

2-Phase Synchronous Step-Down Controller

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LTC3826-1
30µA IQ, Dual, 2-Phase
Synchronous Step-Down Controller
FEATURES
DESCRIPTION
n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
n Low Operating IQ: 30μA (One Channel On)
n Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
n OPTI-LOOP® Compensation Minimizes COUT
n ±1% Output Voltage Accuracy
n Wide VIN 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 IQ: 4μA
n Internal LDO Powers Gate Drive from VIN or VOUT
n Small 28-Lead SSOP Package
APPLICATIONS
n Automotive Systems
n Battery-Operated Digital Devices
n Distributed DC Power Systems
The LTC®3826-1 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 ESR 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
LTC3826-1 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 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.
TYPICAL APPLICATION
VOUT1
3.3V
5A
3.3μH
0.015Ω
62.5k
150μF
High Efficiency Dual 8.5V/3.3V Step-Down Converter
0.1μF
VIN
TG1
INTVCC
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
LTC3826-1
PGND
SENSE1+
SENSE2+
SENSE1
SENSE2
VFB1
VFB2
ITH1
ITH2
20k
220pF TRACK/SS1 SGND TRACK/SS2
15k
0.1μF
0.1μF
4.7μF
0.1μF
220pF
15k
VIN
4V TO 36V
22μF
50V
7.2μH
0.015Ω
192.5k
20k
VOUT2
8.5V
3.5A
150μF
38261 TA01
Efficiency and Power Loss
vs Load Current
100
10000
90
80
1000
70
60
100
50
40
10
30
20
1
10
0
0.00001 0.0001 0.001
FIGURE 13 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
38261 TA01b
38261fb
1


Linear Technology Electronic Components Datasheet

LTC3826IG-1 Datasheet

2-Phase Synchronous Step-Down Controller

No Preview Available !

LTC3826-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN) ......................... 36V to –0.3V
Topside 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,
SENSE2Voltages ..................................... 11V to –0.3V
PLLIN/MODE, PLLLPF, TRACK/SS1, TRACK/SS2
Voltages ........................................... INTVCC to –0.3V
EXTVCC ...................................................... 10V to –0.3V
ITH1, ITH2, VFB1, VFB2 Voltages ................. 2.7V to –0.3V
PGOOD1 Voltage....................................... 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 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
TOP VIEW
ITH1 1
VFB1 2
SENSE1+ 3
SENSE14
PLLLPF 5
PLLIN/MODE 6
SGND 7
RUN1 8
RUN2 9
SENSE210
SENSE2+ 11
VFB2 12
ITH2 13
TRACK/SS2 14
28 TRACK/SS1
27 PGOOD1
26 TG1
25 SW1
24 BOOST1
23 BG1
22 VIN
21 PGND
20 EXTVCC
19 INTVCC
18 BG2
17 BOOST2
16 SW2
15 TG2
G PACKAGE 28-LEAD PLASTIC SSOP
TJMAX = 125°C, QJA = 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC3826EG-1#PBF
TAPE AND REEL
LTC3826EG-1#TRPBF
PART MARKING
LTC3826EG-1
PACKAGE DESCRIPTION
28-Lead Plastic SSOP
LTC3826IG-1#PBF
LTC3826IG-1#TRPBF LTC3826IG-1
28-Lead Plastic SSOP
LEAD BASED FINISH
LTC3826EG-1
TAPE AND REEL
LTC3826EG-1#TR
PART MARKING
LTC3826EG-1
PACKAGE DESCRIPTION
28-Lead Plastic SSOP
LTC3826IG-1
LTC3826IG-1#TR
LTC3826IG-1
28-Lead Plastic SSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
VFB1, 2
IVFB1, 2
VREFLNREG
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
(Note 4) ITH1, 2 Voltage = 1.2V
(Note 4)
VIN = 4V to 30V (Note 4)
l 0.792 0.800 0.808
V
–5
–50
nA
0.002 0.02
%/V
38261fb
2


Part Number LTC3826IG-1
Description 2-Phase Synchronous Step-Down Controller
Maker Linear Technology
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Linear Technology





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