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Linear Technology Electronic Components Datasheet

LTC3728LEGN-1 Datasheet

2-Phase Synchronous Regulator

No Preview Available !

FEATURES
n Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
n OPTI-LOOP® Compensation Minimizes COUT
n ±1.5% Output Voltage Accuracy
n Power Good Output Voltage Indicator
n Phase-Lockable Fixed Frequency 250kHz to 550kHz
n Over Current Latchoff Disabled
n Wide VIN Range: 4.5V to 28V (35V for LTC3728LI-1)
Operation
n Very Low Dropout Operation: 99% Duty Cycle
n Adjustable Soft-Start Current Ramping
n Foldback Output Current Limiting
n Output Overvoltage Protection
n Low Shutdown IQ: 20μA
n 5V and 3.3V Standby Regulators
n 3 Selectable Operating Modes: Constant Frequency,
Burst Mode® Operation and PWM
n 5mm × 5mm QFN and 28-Lead Narrow SSOP
Packages
APPLICATIONS
n Notebook and Palmtop Computers
n Telecom Systems
n Portable Instruments
n Battery-Operated Digital Devices
n DC Power Distribution Systems
LTC3728L-1
Dual, 550kHz, 2-Phase
Synchronous Regulator
DESCRIPTION
The LTC®3728L-1 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. The LTC3728L-1
is identical to the LTC3728L except that the LTC3728L-1
lacks the over current latchoff feature.
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 microproces-
sor generations, and a wide 4.5V to 28V (30V maximum/
35V for LTC3728LI-1) input supply range encompasses
all battery chemistries.
A RUN/SS pin for each controller provides soft-start.
Current foldback limits MOSFET dissipation during short-
circuit conditions. The FCB mode pin can select among
Burst Mode operation, constant frequency mode and
continuous inductor current mode or regulate a secondary
winding. The LTC3728L-1 includes a power good output
pin that indicates when both outputs are within 7.5% of
their designed set point.
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 5929620, 6177787, 6144199, 5471178, 5994885, 6100678.
TYPICAL APPLICATION
M1
L1
3.2μH
+
4.7μF
D3
VIN PGOOD INTVCC
D4
TG1
TG2
CB1, 0.1μF
fIN
500kHz
BOOST1
BOOST2
SW1
SW2
LTC3728L-1
BG1
BG2
PLLIN
PGND
CB2, 0.1μF
1μF
CERAMIC
CIN
22μF
VIN
5.2V TO 28V
M2
50V
CERAMIC
L2
3.2μH
RSENSE1
0.01Ω
VOUT1
5V
R2
5A +
COUT1
47μF
105k
1%
6V
SP
R1
20k
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
R3
20k
1%
1%
COUT
56μF
6V
SP
VOUT2
3.3V
5A
M1, M2: FDS6982S
3728l1 F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728l1fc
1


Linear Technology Electronic Components Datasheet

LTC3728LEGN-1 Datasheet

2-Phase Synchronous Regulator

No Preview Available !

LTC3728L-1
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) .........................30V to – 0.3V
Input Supply Voltage (VIN) LTC3728LI-1....35V to – 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ............................... 36V to –0.3V
(BOOST1, BOOST2) LTC3728LI-1.......... 38V to –0.3V
Switch Voltage (SW1, SW2) ........................... 30V to –5V
Switch Voltage (SW1, SW2) LTC3728LI-1... 35V to –0.3V
INTVCC, EXTVCC, RUN/SS1, RUN/SS2, (BOOST1-SW1),
(BOOST2-SW2), PGOOD ......................... 7V to –0.3V
INTVCC, EXTVCC LTC3728LI-1....................... 8V to –0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2Voltages .....................(1.1)INTVCC to –0.3V
PLLIN, PLLFLTR, FCB, Voltage.............. 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 ..................................40mA
Operating Temperature Range (Note 7).... –40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range................... –65°C to 125°C
Reflow Peak Body Temperature (UH Package)...... 260°C
Lead Temperature (Soldering, 10 sec)
GN Package ...................................................... 300°C
PIN CONFIGURATION
RUN/SS1 1
SENSE1+ 2
SENSE3
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
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
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 s 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3728LEGN-1#PBF
LTC3728LEGN-1#TRPBF LTC3728LEGN-1
28-Lead Narrow Plastic SSOP
LTC3728LIGN-1#PBF
LTC3728LIGN-1#TRPBF LTC3728LIGN-1
28-Lead Narrow Plastic SSOP
LTC3728LEUH-1#PBF
LTC3728LEUH-1#TRPBF 728LE1
32-Lead (5mm × 5mm) Plastic DFN
LTC3728LIUH-1#PBF
LTC3728LIUH-1#TRPBF 3728L1
32-Lead (5mm × 5mm) Plastic DFN
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3728LEGN-1
LTC3728LEGN-1#TR
LTC3728LEGN-1
28-Lead Narrow Plastic SSOP
LTC3728LIGN-1
LTC3728LIGN-1#TR
LTC3728LIGN-1
28-Lead Narrow Plastic SSOP
LTC3728LEUH-1
LTC3728LEUH-1#TR
728LE1
32-Lead (5mm × 5mm) Plastic DFN
LTC3728LIUH-1
LTC3728LIUH-1#TR
3728L1
32-Lead (5mm × 5mm) Plastic DFN
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/
2
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
–40°C to 85°C
3728l1fc


Part Number LTC3728LEGN-1
Description 2-Phase Synchronous Regulator
Maker Linear
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