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What is LTC3735?

This electronic component, produced by the manufacturer "Linear", performs the same function as "2-Phase High Efficiency DC/DC Controller".


LTC3735 Datasheet PDF - Linear

Part Number LTC3735
Description 2-Phase High Efficiency DC/DC Controller
Manufacturers Linear 
Logo Linear Logo 


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FEATURES
n Output Stages Operate Antiphase
n ±1% Output Voltage Accuracy
n 6-Bit IMVP-IV VID Code: VOUT = 0.7V to 1.708V
n Intel Compatible Power Saving Mode (PSIB)
n Stage Shedding Improves Low Current Efficiency
n Power Good Output with Adaptive Masking
n Lossless Voltage Positioning
n Dual Input Supply Capability for Load Sharing
n Resistor Programmable VOUT at Boot-Up and Deeper
Sleep State
n Resistor Programmable Deep Sleep Offset
n Programmable Fixed Frequency: 210kHz to 550kHz
n Adjustable Soft-Start Current Ramping
n Foldback Output Current Limit
n Short-Circuit Shutdown Timer with Defeat Option
n Overvoltage Protection
n Available in 36-Lead SSOP (0.209 Wide) and 38-Lead
(5mm × 7mm) Packages
APPLICATIONS
n Mobile and Desktop Computers
n Internet Servers
LTC3735
2-Phase, High Efficiency
DC/DC Controller for
Intel Mobile CPUs
DESCRIPTION
The LTC®3735 is a 2-phase synchronous step-down
switching regulator controller that drives all N-channel
power MOSFETs in a constant frequency architecture. The
output voltage is programmable by six VID bits during
normal operation and by external resistors during initial
boot-up and deeper sleep state. The LTC3735 drives its two
output stages out-of-phase at frequencies up to 550kHz
to minimize the RMS ripple currents in both input and
output capacitors. This antiphase technique also doubles
the apparent switching frequency, improving the transient
response while operating each phase at an optimum fre-
quency for efficiency. Thermal design is further simplified
by cycle-by-cycle current sharing between the two phases.
An Intel compatible PSIB input is provided to select between
two modes of operation. Fully enhanced synchronous
mode achieves a very small output ripple and very fast
transient response while power saving mode realizes
very high efficiency. OPTI-LOOP® compensation allows
the transient response to be optimized for a wide range
of output capacitance and ESR values.
L, LT, LTC, LTM, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
TYPICAL APPLICATION
100pF
232k
4R.C74k
4C7C0pF
VOA+
4.5V TO 7V
4.7µF
BAT54A
0.1µF
0.47µF
SW2
0.47µF
SW1
MCH_PG
DPRSLPVR
STP_CPUB
PSIB
FREQSET
TG1
SW1
BG1
VID5-VID0 PGND
PGOOD
ITH
SSEENNSSEE11+–
RUN/SS
TG2
SGND
SW2
BG2
LTC3735
PVCC
SSEENNSSEE22+–
RBOOT
BOOST1 RDPRSLP
BOOST2 RDPVSOLAP+
OAVOOUAT
M1 1µH
M2 D1
M3 1µH
M4 D2
12.7k 13.3k
56.2k
1.27M
13.3k
549k VOA+
3735 F01
0.002Ω
0.002Ω
VOUT
0.7V TO 1.708V
+
COUT 40A
330µF
2V
×5
Figure 1. High Current 2-Phase Step-Down Converter
VIN
5V TO 24V
CIN
10µF
35V
×4
3735fa
1

line_dark_gray
LTC3735 equivalent
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3735
Active Mode Efficiency
(Figure 14)
100 VID = 1.468V
PSI = 0
VIN = 7.5V
90
VIN = 20V
80
70
60 0
5 10 15 20 25
LOAD CURRENT (A)
30
3735 G01
Supply Current vs PVCC Voltage
and Mode
2500
2000
ON
1500
1000
500
0
4
SHUTDOWN
56
PVCC VOLTAGE (V)
7
3735 G04
Maximum Current Sense
Threshold vs VRUN/SS (Soft-Start)
80 VSENSE(CM) = 1.25V
70
60
50
40
30
20
10
0
012345
VRUN/SS (V)
3735 G07
Deeper Sleep Mode Efficiency
(Figure 14)
90 PSI = 0
80 VIN = 7.5V
VIN = 20V
70
60
0.01
0.1 1
LOAD CURRENT (A)
10
3735 G02
Maximum Current Sense
Threshold vs Duty Factor
75
50
25
0
0 20 40 60 80 100
DUTY FACTOR (%)
3735 G05
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
76
72
68
64
60
01 2 345
COMMON MODE VOLTAGE (V)
3735 G08
Efficiency vs Input Voltage
(Figure 14)
100 IOUT = 20A
VOUT = 1.6V
90
80
70
60
50
5
10 15
INPUT VOLTAGE (V)
20
3735 G03
Maximum Current Sense
Threshold vs Percent of Nominal
Output Voltage (Foldback)
80
70
60
50
40
30
20
10
0
0 25 50 75 100
PERCENT OF NOMINAL OUTPUT VOLTAGE (%)
3735 G06
Current Sense Threshold
vs ITH Voltage
90
80
70
60
50
40
30
20
10
0
–10
–20
–30
0 0.5 1 1.5 2 2.5
VITH (V)
3735 G09
3735fa
5


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