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Linear Technology Electronic Components Datasheet

LTC3709 Datasheet

No RSENSE Synchronous DC/DC Controller

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LTC3709
Fast 2-Phase, No RSENSETM,
Synchronous DC/DC Controller
with Tracking/Sequencing
FEATURES
DESCRIPTIO
PolyPhaseTM Valley Current Mode Controller
Synchronizable to an External Clock with PLL
Coincident or Ratiometric Tracking
Sense Resistor Optional
2% to 90% Duty Cycle at 200kHz
tON(MIN) < 100ns
True Remote Sensing Differential Amplifier
High Efficiency at Both Light and Heavy Loads
Power Good Output Voltage Monitor
0.6V ±1% Reference
Adjustable Current Limit
Programmable Soft-Start and Operating Frequency
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
32-Lead (5mm × 5mm) QFN Package
U
APPLICATIO S
Notebook Computers
Power Supply for DSP, ASIC, Graphic Processors
The LTC®3709 is a single output, dual phase, synchronous
step-down switching regulator. The controller uses a
constant on-time, valley current control architecture to
deliver very low duty cycles without requiring a sense
resistor. Operating frequency is selected by an external
resistor and is compensated for variations in input supply
voltage. An internal phase-locked loop allows the LTC3709
to be synchronized to an external clock.
A TRACK pin is provided for tracking or sequencing the
output voltage among several LTC3709 chips or an
LTC3709 and other DC/DC regulators. Soft-start is ac-
complished using an external timing capacitor.
Fault protection is provided by an output overvoltage com-
parator and an optional short-circuit shutdown timer. The
current limit level is user programmable. A wide supply
range allows voltages as high as 31V to step down to 0.6V.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No RSENSE and PolyPhase are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6476589, 6144194, 5847554, 6177678,
6304066, 6580258, 6674274, 6462525, 6593724.
TYPICAL APPLICATIO
High Efficiency Dual Phase 1.5V/30A Step-Down Converter
5V
4.7µF
10
324k
47.5k
1µF
10k
100k
0.1µF
3.32k
100nF
680pF
20k
10k
15k
VCC DRVCC ION
TRACK
TG1
VRNG
FCB
BOOST1
PGOOD
SW1
SENSE1+
RUN/SS
BG1
EXTLPF SENSE1
INTLPF
PGND1
ITH LTC3709
SGND
VFB
DIFFOUT
VOS–
VOS+
TG2
BOOST2
SW2
SENSE2+
BG2
SENSE2
PGND2
1µF
1µF
PGND1
PGND2
0.22µF
HAT2168H
10µF
35V
×3
1.22µH
HAT2165H
VIN
4.5V TO 28V
0.22µF
HAT2168H
HAT2165H
VIN
1.22µH
VOUT
1.5V
30A
+ 330µF
2.5V
×4
Efficiency and Power Loss
100
VIN = 12V
95
10
9
90
EFFICIENCY
85
8
7
80 6
75 5
70 4
65 3
POWER LOSS
60 2
55 1
50
0.01
0.1 1
10
LOAD CURRENT (A)
0
100
3709 TA01b
3709 TA01a
3709f
1


Linear Technology Electronic Components Datasheet

LTC3709 Datasheet

No RSENSE Synchronous DC/DC Controller

No Preview Available !

www.DataSheet4U.com
LTC3709
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VCC, DRVCC) ............ 7V to – 0.3V
Boosted Topside Driver Supply Voltage
(BOOST1, BOOST2) .................................. 37V to – 0.3V
Switch Voltage (SW1, 2) ............................. 31V to – 1V
SENSE1+, SENSE2+ Voltages ....................... 31V to – 1V
SENSE1, SENSE2Voltages .................... 10V to – 0.3V
ION Voltage ............................................... 31V to –0.3V
(BOOST – SW) Voltages ..............................7V to – 0.3V
RUN/SS, PGOOD Voltages .......................... 7V to – 0.3V
TRACK Voltage ............................................7V to – 0.3V
VRNG Voltage ................................. VCC + 0.3V to – 0.3V
ITH Voltage ............................................... 2.7V to – 0.3V
VFB Voltage .............................................. 2.7V to – 0.3V
INTLPF, EXTLPF Voltages ........................ 2.7V to – 0.3V
VOS+, VOS– Voltages ................................... 7V to – 0.3V
FCB Voltage ................................................ 7V to – 0.3V
Operating Temperature Range ................ – 40°C to 85°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range ................ – 65°C to 125°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
32 31 30 29 28 27 26 25
RUN/SS 1
24 SENSE1
ITH 2
VFB 3
TRACK 4
SGND 5
23 PGND1
22 BG1
21 DRVCC
33
20 BG2
SGND 6
VOS– 7
DIFFOUT 8
19 PGND2
18 SENSE2
17 VCC
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
EXPOSED PAD IS SGND (PIN 33)
MUST BE SOLDERED TO PCB
TJMAX = 125°C, θJA = 34°C/ W
ORDER PART NUMBER UH PART MARKING
LTC3709EUH
3709
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = DRVCC = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Main Control Loop
IQ Input DC Supply Current
Normal
Shutdown
2.4 3
25 65
IFB
VFB
VFB(LINEREG)
VFB(LOADREG)
gm(EA)
tON
FB Pin Input Current
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Voltage Load Regulation
Error Amplifier Transconductance
On-Time
tON(MIN)
tOFF(MIN)
Minimum On-Time
Minimum Off-Time
ITH = 1.2V (Note 3)
ITH = 1.2V (Note 3)
VIN = 4V to 6.5V (Note 3)
ITH = 0.5V to 2V (Note 3)
ITH = 1.2V (Note 3)
VIN = 20V, ION = 180µA
VIN = 20V, ION = 90µA
VIN = 20V, ION = 540µA
VIN = 20V, ION = 90µA
0.594
1.3
90
180
– 35
0.600
0.02
– 0.12
1.45
116
233
45
250
– 60
0.606
– 0.2
1.6
140
280
100
350
UNITS
mA
µA
nA
V
%/V
%
mS
ns
ns
ns
ns
3709f
2


Part Number LTC3709
Description No RSENSE Synchronous DC/DC Controller
Maker Linear Technology
Total Page 24 Pages
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