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Linear Technology Electronic Components Datasheet

LTC3827EUH Datasheet

2-Phase Synchronous Step-Down Controller

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LTC3827
Low IQ, Dual, 2-Phase
Synchronous Step-Down Controller
FEATURES
DESCRIPTION
n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
n Low Operating IQ: 80μA (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: 8μA
n Internal LDO Powers Gate Drive from VIN or VOUT
n Small 5mm × 5mm QFN Package
APPLICATIONS
n Automotive Systems
n Battery-Operated Digital Devices
n Distributed DC Power Systems
The LTC®3827 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 80μA 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
LTC3827 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 LTC3827-1 datasheet.
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, 570919.
TYPICAL APPLICATION
VOUT1
3.3V
5A
3.3μH
0.015Ω
62.5k
150μF
High Efficiency Dual 8.5V/3.3V Step-Down Converter
+
4.7μF
0.1μF
VIN
TG1
BOOST1
SW1
INTVCC
TG2
BOOST2
SW2
1μF
0.1μF
22μF
50V
VIN
4V TO 36V
7.2μH
BG1
BG2
LTC3827
PGND
SENSE1+
SENSE2+
0.015Ω
SENSE1
SENSE2
VFB1
VFB2
ITH1
ITH2
20k
220pF TRACK/SS1 SGND TRACK/SS2
15k
0.1μF
0.1μF
220pF
15k
192.5k
20k
VOUT2
8.5V
3.5A
150μF
3827 TA01
Efficiency and Power Loss
vs Load Current
100
100000
90
EFFICIENCY
VIN = 12V; VOUT = 3.3V
10000
80
70
1000
60
50
100
40
30
POWER LOSS 10
20
10
0
0.001 0.01
1
FIGURE 13 CIRCUIT
0.1
0.1 1 10 100 1000 10000
LOAD CURRENT (mA)
3827 TA01b
3827ff
1


Linear Technology Electronic Components Datasheet

LTC3827EUH Datasheet

2-Phase Synchronous Step-Down Controller

No Preview Available !

LTC3827
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, Voltages ........... INTVCC to –0.3V
PHASMD, FOLDDIS, 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, PGOOD2 Voltages ..................... 8.5V to –0.3V
Peak Output Current <10μs (TG1, TG2, BG1, BG2).....3A
INTVCC Peak Output Current ................................. 50mA
Operating Temperature Range (Note 2).... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range .................. –65°C to 125°C
PIN CONFIGURATION
TOP VIEW
32 31 30 29 28 27 26 25
SENSE11
24 BOOST1
PLLLPF 2
23 BG1
PHASMD 3
CLKOUT 4
PLLIN/MODE 5
SGND 6
RUN1 7
22 VIN
21 PGND
33
20 EXTVCC
19 INTVCC
18 BG2
RUN2 8
17 BOOST2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33) IS SGND
MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3827EUH#PBF
LTC3827EUH#TRPBF
3827
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3827IUH#PBF
LTC3827IUH#TRPBF
3827
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3827EUH
LTC3827EUH#TR
3827
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3827IUH
LTC3827IUH#TR
3827
32-Lead (5mm × 5mm) Plastic QFN
–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/
3827ff
2


Part Number LTC3827EUH
Description 2-Phase Synchronous Step-Down Controller
Maker Linear Technology
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