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Linear Technology Electronic Components Datasheet

LTC3727EG Datasheet

2-Phase Synchronous Step-Down Switching Regulators

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LTC3727/LTC3727-1
High Efficiency, 2-Phase
Synchronous Step-Down Switching Regulators
FEATURES
Wide Output Voltage Range: 0.8V VOUT 14V
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP® Compensation Minimizes COUT
±1% Output Voltage Accuracy
Power Good Output Voltage Monitor
Phase-Lockable Fixed Frequency 250kHz to 550kHz
Latched Short-Circuit Shutdown (LTC3727 Only)
Dual N-Channel MOSFET Synchronous Drive
Wide VIN Range: 4V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Output Overvoltage Protection
Low Shutdown IQ: 20μA
Selectable Constant Frequency or Burst Mode®
Operation
Small 28-Lead SSOP Package
LTC3727-1 Also Available in the 5mm × 5mm QFN
Package
U
APPLICATIO S
Telecom Systems
Automotive Systems
Battery-Operated Digital Devices
DESCRIPTIO
The LTC®3727/LTC3727-1 are high performance dual
step-down switching regulator controllers that drive all
N-channel synchronous power MOSFET stages. A con-
stant frequency current mode architecture allows phase-
lockable frequency of up to 550kHz. Power loss and noise
due to the ESR of the input capacitors are minimized by
operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance and
ESR values. There is a precision 0.8V reference and a power
good output indicator. A wide 4V to 30V (36V maximum)
input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides soft-start, and
on the LTC3727GN, optional timed, short-circuit shut-
down. Current foldback limits MOSFET heat dissipation
during short-circuit conditions when overcurrent latchoff
is disabled. Output overvoltage protection circuitry latches
on the bottom MOSFET until VOUT returns to normal. The
FCB mode pin can select among Burst Mode, constant
frequency mode and continuous inductor current mode or
regulate a secondary winding.
, 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, 6100678, 5408150, 6580258, 6304066, 5705919.
TYPICAL APPLICATIO
8μH
0.015Ω
VOUT1
5V
5A
+
47μF
6V
SP
105k
1%
+
4.7μF
M1
0.1μF
M2
1000pF
220pF
20k
1%
15k
VIN PGOOD INTVCC
TG1
TG2
BOOST1
BOOST2
SW1
SW2
LTC3727/
BG1 LTC3727-1 BG2
PLLIN
SENSE1+
PGND
SENSE2+
SENSE1
SENSE2
VOSENSE1
VOSENSE2
ITH1
ITH2
RUN/SS1 SGND RUN/SS2
0.1μF
0.1μF
1μF
CERAMIC
M3
0.1μF
M4
VIN
22μF 18V TO 28V
50V
CERAMIC
15μH
1000pF
220pF
15k
280k
1%
20k
1%
0.015Ω
VOUT2
12V
4A
56μF
15V
SP
M1, M2, M3, M4: FDS6680A
3727 F01
Figure 1. High Efficiency Dual 12V/5V Step-Down Converter
3727fc
1


Linear Technology Electronic Components Datasheet

LTC3727EG Datasheet

2-Phase Synchronous Step-Down Switching Regulators

No Preview Available !

LTC3727/LTC3727-1
ABSOLUTE AXI U RATI GS (Note 1)
Input Supply Voltage (VIN).........................36V to – 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ...................................42V to – 0.3V
Switch Voltage (SW1, SW2) .........................36V to – 5V
INTVCC, EXTVCC, (BOOST1-SW1),
(BOOST2-SW2) ........................................8.5V to – 0.3V
RUN/SS1, RUN/SS2, PGOOD ..................... 7V to – 0.3V
SENSE1+, SENSE2 +, SENSE1,
SENSE2 Voltages .....................................14V to – 0.3V
PLLIN, PLLFLTR, FCB Voltages ........... INTVCC to – 0.3V
ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages ... 2.7V 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
Lead Temperature
(Soldering, 10 sec, G Package)............................. 300°C
Solder Reflow Temperature (UH Package) ........... 265°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN/SS1 1
SENSE1+ 2
SENSE13
VOSENSE1 4
PLLFLTR 5
PLLIN 6
FCB 7
ITH1 8
SGND 9
3.3VOUT 10
ITH2 11
VOSENSE2 12
SENSE213
SENSE2+ 14
28 PGOOD
27 TG1
26 SW1
25 BOOST1
24 VIN
23 BG1
22 EXTVCC
21 INTVCC
20 PGND
19 BG2
18 BOOST2
17 SW2
16 TG2
15 RUN/SS2
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
ORDER PART
NUMBER
LTC3727EG
LTC3727EG-1
LTC3727IG-1
TOP VIEW
32 31 30 29 28 27 26 25
VOSENSE1 1
PLLFLTR 2
PLLIN 3
24 BOOST1
23 VIN
22 BG1
FCB 4
ITH1 5
SGND 6
21 EXTVCC
33
20 INTVCC
19 PGND
3.3VOUT 7
ITH2 8
18 BG2
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 Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC3727EUH-1
UH PART
MARKING
37271
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Main Control Loops
VOSENSE1, 2
IVOSENSE1, 2
VREFLNREG
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
(Note 4); ITH1, 2 Voltage = 1.2V
(Note 4)
VIN = 3.6V to 30V (Note 4)
0.792 0.800 0.808
V
–5
– 50
nA
0.002 0.02
%/V
3727fc
2


Part Number LTC3727EG
Description 2-Phase Synchronous Step-Down Switching Regulators
Maker Linear
PDF Download

LTC3727EG Datasheet PDF






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