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LTC1702 Datasheet

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller

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LTC1702 pdf
LTC1702
Dual 550kHz Synchronous
2-Phase Switching Regulator Controller
FEATURES
s Two Independent Controllers in One Package
s Two Sides Run Out-of-Phase to Minimize CIN
s All N-Channel External MOSFET Architecture
s No External Current Sense Resistors
s Excellent Output Regulation: 1% Total Output
Accuracy
s 550kHz Switching Frequency Minimizes External
Component Size
s 1A to 25A Output Current per Channel
s High Efficiency over Wide Load Current Range
s Quiescent Current Drops Below 100µA in Shutdown
s Small 24-Pin Narrow SSOP Package
U
APPLICATIO S
s Microprocessor Core and I/O Supplies
s Multiple Logic Supply Generator
s Distributed Power Applications
s High Efficiency Power Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
DESCRIPTIO
The LTC®1702 is a dual switching regulator controller opti-
mized for high efficiency with low input voltages. It includes
two complete, on-chip, independent switching regulator
controllers each designed to drive a pair of external N-channel
MOSFET devices in a voltage mode feedback, synchronous
buck configuration. The LTC1702 uses a constant-frequency,
true PWM design switching at 550kHz, minimizing external
component size and cost and maximizing load transient
performance. The synchronous buck architecture automati-
cally shifts to discontinuous and then to Burst ModeTM
operation as the output load decreases, ensuring maximum
efficiency over a wide range of load currents.
The LTC1702 features an onboard reference trimmed to
0.5% and can provide better than 1% regulation at the
converter outputs. Open-drain logic outputs indicate whether
either output has risen to within 5% of the final output voltage
and an optional latching FAULT mode protects the load if the
output rises 15% above the intended voltage. Each channel
can be enabled independently; with both channels disabled,
the LTC1702 shuts down and supply current drops below
100µA.
TYPICAL APPLICATIO
Dual Output High Power 3.3V/2.5V Logic Supply
COUT1, COUT2: PANASONIC EEFUE0G181R
CIN: KEMET TS10X337M010AS
D1, D2: MOTOROLA MBR0520LT1
D3, D4: MOTOROLA MBRS320T3
L1, L2: SUMIDA CEP125-1R0
Q1 TO Q8: FAIRCHILD FDS6670A
1µF
VOUT1
2.5V
AT 15A
Q1
L1
1µH
+
1µF
COUT1
180µF
×4
D3
1.2k
Q3
10k 820pF
1%
Q2
Q4
VIN
PWRGD1
10k
4.75k
1%
47k
680pF
27pF
VIN = 5V ±10%
D2 1010µF
1µF
1
1µF PVCC
2
BOOST1
24
IMAX2
23
BOOST2
3
BG1
22
BG2
4
TG1
21
TG2
5 20
SW1 SW2
27k 6
19
IMAX1
7
LTC1702
PGND
18
PGOOD1
PGOOD2
8
FCB
17
FAULT
9
RUN/SS
1µF 10
COMP1
16
RUN/SS2
15
COMP2
11
SGND
14
FB2
12
FB1
13
VCC
+
D1
27k
CIN
330µF
×3
10µF
1µF
27pF
1µF
Q5 Q6
L2
1µH
Q7 Q8 D4
VOUT2
3.3V/15A
1.6k
680pF
15.8k + COUT2
1% 180µF
×4
1µF
68k
3300pF
4.99k
1%
VIN
10k
PWRGD2
FAULT
1702 TA01
1


Linear Technology Electronic Components Datasheet

LTC1702 Datasheet

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller

No Preview Available !

LTC1702 pdf
LTC1702
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage
VCC ........................................................................................... 7V
BOOSTn ............................................................... 15V
BOOSTn – SWn .................................................... 7V
Input Voltage
SWn .......................................................... – 1V to 8V
All Other Inputs ......................... – 0.3V to VCC + 0.3V
Peak Output Current < 10µs
TGn, BGn ............................................................... 5A
Operating Temperature Range
LTC1702C ............................................... 0°C to 70°C
LTC1702I ........................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
PVCC 1
BOOST1 2
BG1 3
TG1 4
SW1 5
IMAX1 6
PGOOD1 7
FCB 8
RUN/SS1 9
COMP1 10
SGND 11
FB1 12
24 IMAX2
23 BOOST2
22 BG2
21 TG2
20 SW2
19 PGND
18 PGOOD2
17 FAULT
16 RUN/SS2
15 COMP2
14 FB2
13 VCC
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 100°C/ W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1702CGN
LTC1702IGN
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VCC = 5V unless otherwise specified. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Main Control Loop
VCC
PVCC
BVCC
ICC
VCC Supply Voltage
PVCC Supply Voltage
BOOST Pin Voltage
VCC Supply Current
(Note 2)
VBOOST – VSW (Note 2)
Test Circuit 1, CL = 0pF
RUN/SS1 = RUN/SS2 = 0V (Note 5)
q3
7
q3
7
q 2.7
7
q 2.2 8
q 30 100
IPVCC
PVCC Supply Current
Test Circuit 1, CL = 0pF (Note 4)
RUN/SS1 = RUN/SS2 = 0V (Note 5)
q
q
2.2 6
6 100
IBOOST
BOOST Pin Current
Test Circuit 1, CL = 0pF (Note 4)
RUN/SS1 = RUN/SS2 = 0V
q
q
1.3 3
0.1 10
VFB
VFB
IFB
VOUT
VFCB
VFCB
IFCB
VRUN
ISS
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Current
Output Voltage Load Regulation
FCB Threshold
FCB Feedback Hysteresis
FCB Pin Current
RUN/SS Pin RUN Threshold
Soft-Start Source Current
Test Circuit 1, CL = 0pF, LTC1702C
Test Circuit 1, CL = 0pF, LTC1702I
VCC = 3V to 7V
(Note 6)
RUN/SSn = 0V
q 0.792 0.800 0.808
q 0.790 0.800 0.810
q ±0.005 ±0.05
q ±0.001 ±1
q 0.1 ±0.2
q 0.75 0.8 0.85
20
q ±0.001 ±1
q 0.45 0.55 0.65
– 2 – 3.5 – 6
UNITS
V
V
V
mA
µA
mA
µA
mA
µA
V
V
%/V
µA
%
V
mV
µA
V
µA
2


Part Number LTC1702
Description Dual 550kHz Synchronous 2-Phase Switching Regulator Controller
Maker Linear Technology
Total Page 30 Pages
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