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Linear Technology Electronic Components Datasheet

LTC1703 Datasheet

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

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LTC1703 pdf
LTC1703
Dual 550kHz Synchronous
2-Phase Switching Regulator
Controller with 5-Bit VID
FEATURES
s Two Independent PWM Controllers in One Package
s Side 1 Output Is Compliant with Intel Mobile
VID Specifications (Includes 5-Bit DAC)
s 0.9V to 2.0V Output Voltage with 25mV/50mV Steps
s Two Sides Run Out-of-Phase to Minimize CIN
s All N-Channel External MOSFET Architecture
s No External Current Sense Resistor
s Precision Internal 0.8V ±1% Reference
s 550kHz Switching Frequency Minimizes External
Component Size
s Very Fast Transient Response
s Up to 25A Output Current per Channel
s Low Shutdown Current: < 100µA
s Small 28-Pin SSOP Package
U
APPLICATIO S
s Mobile Pentium® III Processor Systems
s Microprocessor Core and I/O Supplies
s Multiple Logic Supply Generator
s High Efficiency Power Conversion
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation. Pentium is a registered trademark
of Intel Corporation.
DESCRIPTIO
The LTC®1703 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 is designed to drive a pair of external
N-channel MOSFET devices in a voltage mode feedback,
synchronous buck configuration. The LTC1703 includes
digital output voltage adjustment on side 1 that conforms to
the Intel Mobile VID specification. It uses a constant-
frequency, true PWM design switching at 550kHz, minimiz-
ing external component size and cost and optimizing load
transient performance. The synchronous buck architecture
automatically 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 LTC1703 features an onboard reference trimmed to 1%
and delivers better than 1.5% regulation at the converter
outputs. 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 LTC1703 shuts down and supply current drops
below 100µA.
TYPICAL APPLICATIO
Dual Output Mobile Pentium III Processor Supply
VOUT1
0.9V
TO 2V
15A
GND
DCP1
MBR0520LT1
L1 QT1
1µH
1µF
DCP2
MBR0520LT1
LTC1703
+ COUT1
180µF
QB1A
QB1B
CCP1
1µF
1
2
PVCC
BOOST1
3 BG1
IMAX2
BOOST2
28
27
BG2 26
4V
×6
4 TG1
5 SW1
TG2 25
SW2 24
RIMAX1,18.7k
6
7
IMAX1
FCB
PGND 23
FAULT 22
8 RUN/SS1 RUN/SS2 21
CSS1
9 COMP1
COMP2 20
0.22µF
R21
100k
C31
220pF
C11
220pF
C21
15pF
R31, 10k
10 SGND
11 FB1
12 SENSE
13 VID0
14 VID1
FB2 19
VCC
VID4
18
17
VID3 16
VID2 15
L1: MURATA LQT12535C1R5N12
L2: COILTRONICS UP2B-2R2
QT1, QB1A, QB1B: INTERNATIONAL RECTIFIER IRF7811
QT2, QB2: 1/2 FAIRCHILD NDS8926
VID0
VID1
VID2
VID3
VID4
QT2
L2
2.2µH
CCP2
1µF
QB2
RIMAX2
20k
+
R22, 100k
C22
15pF
C12
220pF
1µF
+ CIN
150µF
10V
×2
VIN
4.5V TO 5.5V
COUT2
180µF
4V
R12
10.2k
0.1%
C32
2200pF
R32
1k
10
VOUT2
1.5V
3A
RB2
11.5k
0.1%
GND
GND
CSS2
0.22µF
1703 TA01
1


Linear Technology Electronic Components Datasheet

LTC1703 Datasheet

Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID

No Preview Available !

LTC1703 pdf
LTC1703
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
VCC ........................................................................................... 7V
BOOSTn ............................................................... 15V
BOOSTn – SWn .................................................... 7V
Input Voltage
SWn .......................................................... – 1V to 8V
VIDn ....................................................... – 0.3V to 7V
All Other Inputs ......................... – 0.3V to VCC + 0.3V
Peak Output Current < 10µs
TGn, BGn ............................................................... 5A
Operating Temperature Range .................... 0°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
PVCC 1
BOOST1 2
BG1 3
TG1 4
SW1 5
IMAX1 6
FCB 7
RUN/SS1 8
COMP1 9
SGND 10
FB1 11
SENSE 12
VID0 13
VID1 14
TOP VIEW
28 IMAX2
27 BOOST2
26 BG2
25 TG2
24 SW2
23 PGND
22 FAULT
21 RUN/SS2
20 COMP2
19 FB2
18 VCC
17 VID4
16 VID3
15 VID2
ORDER PART
NUMBER
LTC1703CG
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 55°C/ W
Consult factory for Industrial and Military grade parts.
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
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 (Note 4)
RUN/SS1 = RUN/SS2 = 0V (Note 5)
q
q
2.2 6
6 100
IBOOST
BOOST Pin Current
Test Circuit 1 (Note 4)
RUN/SS1 = RUN/SS2 = 0V
q 1.3 3
q 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
VCC = 3V to 7V
FB2 Only (Note 8)
(Note 6)
RUN/SSn = 0V
q 0.792 0.800 0.808
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
– 1.5 – 3.5 – 5.5
UNITS
V
V
V
mA
µA
mA
µA
mA
µA
V
%/V
µA
%
V
mV
µA
V
µA
2


Part Number LTC1703
Description Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
Maker Linear Technology
Total Page 30 Pages
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