900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3728LCGN Datasheet

2-Phase Synchronous Regulators

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% Output Voltage Accuracy (LTC3728LC)
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: 4.5V to 28V 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 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/LTC3728LX
Dual, 550kHz, 2-Phase
Synchronous Regulators
Description
The LTC®3728L/LTC3728LX are dual high performance
step-down switching regulator controllers that drive 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 microproces-
sor generations, and a wide 4.5V to 28V (30V 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 LTC3728L/LTC3728LX include
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, OPTI-LOOP and PolyPhase
are registered trademarks of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
M1
L1
3.2µH
D1
+
4.7µF
D3
VIN PGOOD INTVCC
D4
TG1
TG2
CB1, 0.1µF
fIN
500kHz
BOOST1
BOOST2
SW1
SW2
LTC3728L/
BG1 LTC3728LX BG2
PLLIN
PGND
CB2, 0.1µF
1µF
CERAMIC
M2
D2
CIN
22µF
VIN
5.2V TO 28V
50V
CERAMIC
L2
3.2µH
RSENSE1
0.01Ω
VOUT1
5V
5A
R2
105k
+
COUT1
47µF
1%
6V
SP
M1, M2: FDS6982S
SENSE1+
SENSE2+
1000pF
1000pF
SENSE1
SENSE2
VOSENSE1
VOSENSE2
ITH1
ITH2
R1
CC1
220pF
RUN/SS1 SGND RUN/SS2
CC2
220pF
20k
1%
RC1
15k
CSS1
0.1µF
CSS2
0.1µF
RC2
15k
RSENSE2
0.01Ω
R4
63.4k
R3
1%
20k
1%
COUT
56µF
6V
SP
VOUT2
3.3V
5A
3728 F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3728lxff
1


Linear Technology Electronic Components Datasheet

LTC3728LCGN Datasheet

2-Phase Synchronous Regulators

No Preview Available !

LTC3728L/LTC3728LX
Absolute Maximum Ratings (Note 1)
Input Supply Voltage (VIN)......................... 30V to – 0.3V
Topside Driver Voltages
(BOOST1, BOOST2)............................... 36V to –0.3V
Switch Voltage (SW1, SW2)......................... 30V 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.................................. 40mA
Operating Temperature Range (Note 7)
LTC3728LC/LTC3728LXC......................... 0°C to 85°C
LTC3728LE/LTC3728LI......................... –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
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
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
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 (PIN 33), MUST BE SOLDERED TO PCB
3728lxff
2


Part Number LTC3728LCGN
Description 2-Phase Synchronous Regulators
Maker Linear
PDF Download

LTC3728LCGN Datasheet PDF






Similar Datasheet

1 LTC3728LCGN 2-Phase Synchronous Regulators
Linear





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy