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Linear Technology Electronic Components Datasheet

LTC1705 Datasheet

Dual 550kHz Synchronous Switching Regulator Controller

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LTC1705 pdf
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LTC1705
FEATURES
Dual 550kHz Synchronous
Switching Regulator Controller with
5-Bit VID and 150mA LDO
DESCRIPTIO
s Three Regulated Outputs: Core, I/O and CLK in One
Package
s Integrated Intel Mobile 5-Bit VID DAC
s No External Current Sense Resistors
s All N-Channel External MOSFET Architecture
s 550kHz Switching Frequency Minimizes External
Component Size and Cost
s Integrated 150mA LDO Linear Regulator
s Excellent DC Accuracy: 1.25% for Core, 2% for I/O
and CLK Supplies
s PGOOD Flag Monitors All Three Outputs
s High Efficiency Over Wide Load Current Range
s Low Shutdown Current: < 100µA
s Switchers Run Out-of-Phase to Minimize CIN
s Small 28-Pin Narrow SSOP Package
U
APPLICATIO S
s Complete Power Supply Controller for Intel
Mobile Pentium® Processors
s Intel Mobile Pentium Core, I/O, Clock Supplies
s Multiple Logic Supply Generator
The LTC®1705 is a complete power supply controller for
Intel Mobile Pentium processors. It includes two switch-
ing regulator controllers, each designed to drive a pair of
N-channel MOSFETs in a voltage mode feedback, syn-
chronous buck configuration, to provide the core and I/O
supplies. The core controller includes a 5-bit DAC that
conforms to the Intel Mobile VID specification. The IC also
includes a low dropout linear regulator (LDO) that delivers
up to 150mA of output current to provide the CLK supply.
The LTC1705 uses a constant-frequency 550kHz PWM
architecture, minimizing external component size and
cost, as well as optimizing load transient performance. It
provides better than 1.25% DC accuracy at its core output,
and 2% at I/0 and CLK outputs. The high performance
feedback loops allow the circuit to keep total output
regulation within ±5% under all transient conditions. An
open-drain PGOOD flag indicates that all three outputs are
within ±10% of their regulated values. A shutdown circuit
disables all three outputs if the RUN/SS pin is pulled to
ground. In this mode, the LTC1705 supply current drops
to below 100µA.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
TYPICAL APPLICATIO
Intel Mobile Pentium VRM Supply
VIN
5V
CIN
330µF
+
1µF
10V
DCPC
MBR
×3 0520LT1
QTCA QTCB
5
LC
0.68µH
CCPC
1µF
3
6
VOUTC
0.9V TO 2V
15A
1µF +
COUTC
180µF
4V
×6
QBCB
QBCA
4
RIMAXC, 27k 8
13
11
R31 C11
C31 1.8k 1800pF
1800pF
SHUTDOWN
CIN: KEMET T510X337K010AS
COUTC: PANASONIC EEFUE0G181R
COUTIO: AVX TPS0107M010R0065
LC: SUMIDA CEP125-4712-T007
LIO: SUMIDA CDRH6D28-3R0
QTCA, QTCB, QBCA, QBCB: FAIRCHILD FDS6670A
QTIO, QBIO: 1/2 FAIRCHILD NDS8926
R21, 11k
10k
C21
330pF
CSS
0.1µF
10
9
7
12
14–18
5-BIT VID
RPGOOD
5k
2 22
PVCC
TGC
BOOSTC
PGOOD
SWC
BGC
IMAXC
SENSEC
FBC
LTC1705
COMPC
RUN/SS
PGND
GND
VID4:0
1010µF
19
DCPIO
MBR
0520LT1
VCC 26
TGIO
27
BOOSTIO
25
SWIO
CCPIO
1µF
BGIO
IMAXIO
COMPIO
FBIO
28
1 RIMAXI0, 16k
21 R22, 11k
C22
20 100pF
QTIO
LIO
3µH
QBIO
COUTIO
100µF
+
10V
×2
C12
2200pF
RB2
10k
1%
VINCLK
VOUTCLK
24
+
23
CVINCLK
10µF
10V
+CVOUTCLK
10µF
10V
VINCLK
3.3V
VOUTCLK
2.5V
150mA
1µF
1µF
R12
8.87k
1%
VOUTIO
1.5V
3A
1705 TA01
1


Linear Technology Electronic Components Datasheet

LTC1705 Datasheet

Dual 550kHz Synchronous Switching Regulator Controller

No Preview Available !

LTC1705 pdf
LTC1705
ABSOLUTE AXI U RATI GS
(Note 1)
Supply Voltage
VCC, PVCC, VINCLK .................................................. 6V
BOOSTC, BOOSTIO ............................................. 12V
BOOSTC – SWC, BOOSTIO – SWIO ....................... 6V
Input Voltage
SWC, SWIO ................................................ –1V to 6V
SENSEC, FBC, FBIO, VIDn ....... – 0.3V to (VCC + 0.3V)
PGOOD, RUN/SS,
IMAXC, IMAXIO .................................. – 0.3V to (VCC + 0.3V)
Peak Output Current <10µs
TGC, BGC .............................................................. 5A
TGIO, BGIO ....................................................... 1.25A
Operating Temperature Range (Note 2) .. – 40°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
TOP VIEW
IMAXIO
PVCC
BOOSTC
1
2
3
BGC 4
TGC 5
SWC 6
PGND 7
IMAXC 8
RUN/SS 9
COMPC 10
FBC 11
GND 12
SENSEC 13
VID0 14
28 BGIO
27 BOOSTIO
26 TGIO
25 SWIO
24 VINCLK
23 VOUTCLK
22 PGOOD
21 COMPIO
20 FBIO
19 VCC
18 VID4
17 VID3
16 VID2
15 VID1
ORDER PART
NUMBER
LTC1705EGN
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 80°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VCC = PVCC = BOOST = 5V, VINCLK = 3.3V unless otherwise specified. (Note 3)
SYMBOL PARAMETER
VCC
PVCC
BVCC
VINCLK
IVCC
VCC Supply Voltage
PVCC Supply Voltage
BOOST Pin Voltage
VINCLK Supply Voltage
VCC Supply Current
IPVCC PVCC Supply Current
IBOOST IBOOSTC + IBOOSTIO
IVINCLK VINCLK Supply Current
VSHDN RUN/SS Shutdown Threshold
ISS RUN/SS Source Current
Core, I/O Supply Control Loops
VSENSEC
VFBC
VFBIO
dVFB
dVOUT
IFBIO
Output Voltage Accuracy
Core Feedback Voltage
I/O Feedback Voltage
Feedback Voltage Line Regulation
Output Voltage Load Regulation
I/O Feedback Input Current
CONDITIONS
MIN TYP MAX UNITS
q 3.15
5
5.5
V
(Note 4)
q 3.15
5
5.5
V
VBOOST – VSW (Note 4)
q 3.15
q3
5
3.3
5.5
5.5
V
V
Test Circuit 1
RUN/SS = 0V
q
4.5 8
mA
q
40 100
µA
VSENSEC = VFBIO = 0V, No Load at Drivers (Note 5) q
RUN/SS = 0V (Note 6)
q
26
1 50
mA
µA
VSENSEC = VFBIO = 0V, No Load at Drivers (Note 5) q
RUN/SS = 0V (Note 6)
q
26
1 50
mA
µA
IVOUTCLK = 0mA
RUN/SS = 0V
q
1 1.5
mA
q
4 30
µA
VRUN/SS (Rising Edge)
RUN/SS = 0V
q 0.2
0.5
–3
V
µA
Programmed from 0.9V to 2V
(Note 10)
VCC = 3.3V to 5.5V
(Note 7)
q –1.25
q 0.784
q
q – 0.2
q
0.800
0.800
±0.01
– 0.1
1.25
0.816
±0.1
±1
%
V
V
%/V
%
µA
2


Part Number LTC1705
Description Dual 550kHz Synchronous Switching Regulator Controller
Maker Linear Technology
Total Page 28 Pages
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