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Linear Technology Electronic Components Datasheet

LTC3728IG Datasheet

2-Phase Synchronous Step-Down Switching Regulator

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FEATURES
n Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
n OPTI-LOOP® Compensation Minimizes COUT
n ±1% Output Voltage Accuracy
n Power Good Output Voltage Indicator
n Phase-Lockable Fixed Frequency 250kHz to 550kHz
n Dual N-Channel MOSFET Synchronous Drive
n Wide VIN Range: 3.5V to 36V Operation
n Very Low Dropout Operation: 99% Duty Cycle
n Adjustable Soft-Start Current Ramping
n Foldback Output Current Limiting
n Latched Short-Circuit Shutdown with Defeat Option
n Output Overvoltage Protection
n Remote Output Voltage Sense
n Low Shutdown IQ: 20μA
n 5V and 3.3V Regulators
n 3 Selectable Operating Modes: Constant-Frequency,
Burst Mode® Operation and PWM
n Available in 32-Pin 5mm × 5mm QFN and
28-Pin SSOP Packages
APPLICATIONS
n Notebook and Palmtop Computers
n Telecom Systems
n Portable Instruments
n Battery-Operated Digital Devices
n DC Power Distribution Systems
LTC3728
Dual, 550kHz, 2-Phase
Synchronous Step-Down
Switching Regulator
DESCRIPTION
The LTC®3728 is a dual high performance step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant-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. The precision 0.8V reference and power good
output indicator are compatible with future microprocessor
generations, and a wide 3.5V to 30V (36V maximum) input
supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-
start and optional timed, short-circuit shutdown. Current
foldback limits MOSFET 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. The LTC3728 includes a power good
output pin that indicates when both outputs are within
7.5% of their designed set point.
L, LT, LTC, LTM, Linear Technology, the Linear logo, 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, 5705919.
TYPICAL APPLICATION
4.7μF +
M1
D3
VIN PGOOD INTVCC
D4
1μF
TG1
TG2
VIN
CIN 5.2V TO 28V
22μF
M2
50V
L1
3.2μH
CB1, 0.1μF
fIN
500kHz
BOOST1
BOOST2
SW1
SW2
LTC3728
BG1
BG2
PLLIN
PGND
CB2, 0.1μF
L2
3.2μH
RSENSE1
0.01Ω
VOUT1
5V
R2
5A +
COUT1 105k
47μF 1%
R1
6V
20k
SP
1%
1000pF
CC1
220pF
RC1
15k
SENSE1+
SENSE2+
SENSE1
SENSE2
VOSENSE1
ITH1
VOSENSE2
ITH2
RUN/SS1 SGND RUN/SS2
CSS1
0.1μF
CSS2
0.1μF
1000pF
CC2
220pF
RC2
15k
RSENSE2
0.01Ω
R4
63.4k COUT
R3
1% 56μF
20k
6V
1%
SP
VOUT2
3.3V
5A
M1, M2: FDS6982S
3728 F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728fg
1


Linear Technology Electronic Components Datasheet

LTC3728IG Datasheet

2-Phase Synchronous Step-Down Switching Regulator

No Preview Available !

LTC3728
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
INTVCC, EXTVCC, RUN/SS1, RUN/SS2,
(BOOST1-SW1), (BOOST2-SW2), PGOOD ..... 7V to –0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2Voltages .........................(1.1)INTVCC 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 7).... –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
(G Package Only) .................................................. 300°C
PIN CONFIGURATION
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
TOP VIEW
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 = 90°C/W - SINGLE LAYER BOARD
68º C/W - 4 LAYER
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
33
21 EXTVCC
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 IS SGND (MUST BE SOLDERED TO PCB)
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3728EG#PBF
LTC3728EG#TRPBF
LTC3728EG
28-Lead Plastic SSOP
–40°C to 85°C
LTC3728IG#PBF
LTC3728IG#TRPBF
LTC3728IG
28-Lead Plastic SSOP
–40°C to 85°C
LTC3728EUH#PBF
LTC3728EUH#TRPBF 3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3728IUH#PBF
LTC3728IUH#TRPBF
3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3728EG
LTC3728EG#TR
LTC3728EG
28-Lead Plastic SSOP
–40°C to 85°C
LTC3728IG
LTC3728IG#TR
LTC3728IG
28-Lead Plastic SSOP
–40°C to 85°C
LTC3728EUH
LTC3728EUH#TR
3728
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC3728IUH
LTC3728IUH#TR
3728
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/
3728fg
2


Part Number LTC3728IG
Description 2-Phase Synchronous Step-Down Switching Regulator
Maker Linear
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LTC3728IG Datasheet PDF






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