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LTC3709EUH#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
1
LTC3709
3709fb
Fast 2-Phase, No R
SENSE
TM
,
Synchronous DC/DC Controller
with Tracking/Sequencing
■
PolyPhase
®
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
■
t
ON(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
■
Available in 32-Lead (5mm × 5mm) QFN and 36-Lead
SSOP Packages
■
Notebook Computers
■
Power Supply for DSP, ASIC, Graphic Processors
High Efficiency Dual Phase 1.5V/30A Step-Down Converter
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-lock 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 as low
as 0.6V.
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
V
IN
4.5V TO 28V
+
TRACK TG1
BOOST1
SW1
BG1
BG2
PGND1
BOOST2
TG2
SW2
SENSE1
–
SENSE2
–
PGND2
3709 TA01a
SENSE1
+
SENSE2
+
5V
324k
10Ω
4.7µF
1µF
47.5k
HAT2168H
HAT2165H
HAT2165H
0.22µF
0.22µF
HAT2168H
1.22µH
1.22µH
10µF
35V
×3
330µF
2.5V
×4
V
OUT
1.5V
30A
V
IN
V
CC
DRV
CC
I
ON
V
RNG
FCB
PGOOD
LTC3709
RUN/SS
EXTLPF
INTLPF
10k
100nF
I
TH
SGND
V
FB
DIFFOUT
V
OS
–
V
OS
+
15k
10k
100k
0.1µF
3.32k
680pF
20k
TYPICAL APPLICATIO
U
LOAD CURRENT (A)
65
EFFICIENCY (%)
POWER LOSS (W)
95
100
60
55
90
75
85
80
70
0.01 1 10 100
3709 TA01b
50
3
9
10
2
1
8
5
7
6
4
0
0.1
V
IN
= 12V
EFFICIENCY
POWER LOSS
Efficiency and Power Loss
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
No R
SENSE
is a trademark of Linear Technology Corporation.
PolyPhase is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 6476589, 6144194, 5847554, 6100678,
6304066, 6580258, 6674274, 6462525, 6593724.
2
LTC3709
3709fb
I
TH
Voltage ............................................... 2.7V to –0.3V
V
FB
Voltage .............................................. 2.7V to –0.3V
INTLPF, EXTLPF Voltages ........................ 2.7V to –0.3V
V
OS
+
, V
OS
–
Voltages ................................... 7V to –0.3V
FCB Voltage ................................................ 7V to –0.3V
Operating Temperature Range (Note 4) .. –40°C to 85°C
Junction Temperature (Note 2)............................ 125°C
Storage Temperature Range
UH Package ..................................... – 65°C to 125°C
G Package ....................................... – 65°C to 150°C
ABSOLUTE AXI U RATI GS
W
WW
U
(Note 1)
Input Supply Voltage (V
CC
, DRV
CC
) ............ 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
–
, SENSE2
–
Voltages.................... 10V to –0.3V
I
ON
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
V
RNG
Voltage ................................. V
CC
+ 0.3V to –0.3V
PACKAGE/ORDER I FOR ATIO
UU
W
ORDER PART NUMBER
LTC3709EUH
UH PART MARKING
3709
Consult LTC Marketing for parts specified with wider operating temperature ranges.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
TOP VIEW
G PACKAGE
36-LEAD PLASTIC SSOP
36
25
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
NC
PGOOD
I
ON
FCB
V
RNG
RUN/SS
I
TH
V
FB
TRACK
SGND
SGND
V
OS
–
DIFFOUT
V
OS
+
EXTLPF
INTLPF
NC
NC
BOOST1
TG1
SW1
SENSE1
+
SENSE1
–
PGND1
BG1
DRV
CC
BG2
PGND2
SENSE2
–
V
CC
SENSE2
+
SW2
TG2
BOOST2
NC
NC
T
JMAX
= 125°C, θ
JA
= 95°C/ W
ORDER PART NUMBER
LTC3709EG
32 31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
33
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1RUN/SS
I
TH
V
FB
TRACK
SGND
SGND
V
OS
–
DIFFOUT
SENSE1
–
PGND1
BG1
DRV
CC
BG2
PGND2
SENSE2
–
V
CC
V
RNG
FCB
I
ON
PGOOD
BOOST1
TG1
SW1
SENSE1
+
V
OS
+
EXTLPF
INTLPF
NC
BOOST2
TG2
SW2
SENSE2
+
EXPOSED PAD IS SGND (PIN 33)
MUST BE SOLDERED TO PCB
T
JMAX
= 125°C, θ
JA
= 34°C/ W
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
3
LTC3709
3709fb
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= DRV
CC
= 5V, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
I
Q
Input DC Supply Current
Normal 2.4 3 mA
Shutdown 25 65 µA
I
FB
FB Pin Input Current I
TH
= 1.2V (Note 3) – 35 – 60 nA
V
FB
Feedback Voltage I
TH
= 1.2V (Note 3) ● 0.594 0.600 0.606 V
∆V
FB(LINEREG)
Feedback Voltage Line Regulation V
CC
= 4.5V to 6.5V (Note 3) 0.02 %/V
∆V
FB(LOADREG)
Feedback Voltage Load Regulation I
TH
= 0.5V to 2V (Note 3) – 0.12 – 0.2 %
g
m(EA)
Error Amplifier Transconductance I
TH
= 1.2V (Note 3) 1.3 1.45 1.6 mS
t
ON
On-Time I
ON
= 180µA, V
FCB
= 0V 90 116 140 ns
I
ON
= 90µA, V
FCB
= 0V 180 233 280 ns
t
ON(MIN)
Minimum On-Time I
ON
= 540µA 45 100 ns
t
OFF(MIN)
Minimum Off-Time I
ON
= 90µA 250 350 ns
V
SENSE(MAX)
Maximum Current Sense Threshold V
RNG
= 1V 124 144 166 mV
V
RNG
= 0V 86 101 119 mV
V
RNG
= V
CC
177 202 234 mV
V
SENSE(MIN)
Minimum Current Sense Threshold V
RNG
= 1V – 60 mV
V
RNG
= 0V – 40 mV
V
RNG
= V
CC
–80 mV
∆V
FB(OV)
Overvoltage Fault Threshold 8.5 10 12.5 %
∆V
FB(UV)
Undervoltage Fault Threshold – 8.5 – 10 – 12.5 %
V
RUN/SS(ON)
RUN Pin Start Threshold ● 0.8 1.4 2 V
V
RUN/SS(LE)
RUN Pin Latchoff Enable Threshold RUN/SS Pin Rising 3 V
V
RUN/SS(LT)
RUN Pin Latchoff Threshold RUN/SS Pin Falling 2.3 V
I
RUN/SS(C)
Soft-Start Charge Current – 0.5 – 1.2 –3 µA
I
RUN/SS(D)
Soft-Start Discharge Current 0.8 2 4 µA
UVLO Undervoltage Lockout V
CC
Falling 3.9 4.2 V
UVLO
(HYS)
Undervoltage Lockout Hysteresis Measured at V
CC
Pin 0.2 0.35 V
TG R
UP
TG Driver Pull-Up On-Resistance TG High (Note 5) 2 Ω
TG R
DOWN
TG Driver Pull-Down On-Resistance TG Low (Note 5) 1.5 Ω
BG R
UP
BG Driver Pull-Up On-Resistance BG High (Note 5) 3 Ω
BG R
DOWN
BG Driver Pull-Down On-Resistance BG Low (Note 5) 1.5 Ω
Tracking
I
TRACK
TRACK Pin Input Current I
TH
= 1.2V, V
TRACK
= 0.2V (Note 3) –100 –150 nA
V
FB(TRACK)
Feedback Voltage at Tracking V
TRACK
= 0.1V, I
TH
= 1.2V (Note 3) 90 100 110 mV
V
TRACK
= 0.3V, I
TH
= 1.2V (Note 3) 290 300 310 mV
V
TRACK
= 0.5V, I
TH
= 1.2V (Note 3) 490 500 510 mV
PGOOD Output
∆V
FBH
PGOOD Upper Threshold V
FB
Rising 8.5 10 12.5 %
∆V
FBL
PGOOD Lower Threshold V
FB
Falling – 8.5 – 10 – 12.5 %
PG Delay PGOOD Delay V
FB
Rising 100 µs
∆V
FB(HYS)
PGOOD Hysteresis V
FB
Returning 3.5 %
I
PGOOD
PGOOD Leakage Current V
PGOOD
= 7V ±1 µA
V
PGL
PGOOD Low Voltage I
PGOOD
= 5mA 0.2 0.4 V
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LTC3709EUH#PBF

Mfr. #:
Buy LTC3709EUH#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Fast, 2-Phase Controller w/ Tracking
Lifecycle:
New from this manufacturer.
Delivery:
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