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LTC1703IG#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
1
LTC1703
1703fa
+
PV
CC
BOOST1
BG1
TG1
SW1
I
MAX1
FCB
RUN/SS1
COMP1
SGND
FB1
SENSE
VID0
VID1
I
MAX2
BOOST2
BG2
TG2
SW2
PGND
FAULT
RUN/SS2
COMP2
FB2
V
CC
VID4
VID3
VID2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LTC1703
DCP1
MBR0520LT1
DCP2
MBR0520LT1
QT2
QB2
QT1
C
SS1
0.22µF
R21
100k
R12
10.2k
0.1%
R32
1k
C11
220pF
CCP2
1µF
C21
15pF
R
IMAX2
20k
1µF
C
SS2
0.22µF
C32
2200pF
C22
15pF
C12
220pF
1µF
C31
220pF
R31, 10k
R
IMAX1
,18.7k
RB2
11.5k
0.1%
R22, 100k
V
OUT1
0.9V
TO 2V
15A
GND
L1
1µH
CCP1
1µF
QB1B
QB1A
C
OUT1
180µF
4V
× 6
C
IN
150µF
10V
× 2
V
IN
4.5V TO 5.5V
V
OUT2
1.5V
3A
1703 TA01
VID0
VID1
VID2
VID3
VID4
L1: MURATA LQT12535C1R5N12
L2: COILTRONICS UP2B-2R2
QT1, QB1A, QB1B: INTERNATIONAL RECTIFIER IRF7811
QT2, QB2: 1/2 FAIRCHILD NDS8926
L2
2.2µH
+
C
OUT2
180µF
4V
+
10Ω
GND
GND
Dual 550kHz Synchronous
2-Phase Switching Regulator
Controller with 5-Bit VID
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
Mode
®
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.
■
Side 1 Output Is Compliant with Intel
Mobile
VID Specifications (Includes 5-Bit DAC)
■
0.9V to 2.0V Output Voltage with 25mV/50mV Steps
■
Two Sides Run Out-of-Phase to Minimize C
IN
■
Precision Internal 0.8V
±
1% Reference
■
Two Independent PWM Controllers in One Package
■
All N-Channel External MOSFET Architecture
■
No External Current Sense Resistor
■
550kHz Switching Frequency Minimizes External
Component Size
■
Very Fast Transient Response
■
Up to 25A Output Current per Channel
■
Low Shutdown Current: < 100µA
■
Small 28-Pin SSOP Package
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
Mobile Pentium
®
III Processor Systems
■
Microprocessor Core and I/O Supplies
■
Multiple Logic Supply Generator
■
High Efficiency Power Conversion
Dual Output Mobile Pentium III Processor Supply
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1703
1703fa
(Note 1)
Supply Voltage
V
CC
...........................................................................................
7V
BOOST
n...............................................................
15V
BOOST
n
– SW
n
.................................................... 7V
Input Voltage
SW
n
.......................................................... – 1V to 8V
VID
n
....................................................... – 0.3V to 7V
All Other Inputs ......................... – 0.3V to V
CC
+ 0.3V
Peak Output Current < 10µs
TG
n
, BG
n
............................................................... 5A
Operating Temperature Range
LTC1703C .............................................. 0°C to 85°C
LTC1703I........................................... – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 55°C/ W
LTC1703CG
LTC1703IG
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PV
CC
BOOST1
BG1
TG1
SW1
I
MAX1
FCB
RUN/SS1
COMP1
SGND
FB1
SENSE
VID0
VID1
I
MAX2
BOOST2
BG2
TG2
SW2
PGND
FAULT
RUN/SS2
COMP2
FB2
V
CC
VID4
VID3
VID2
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
V
CC
V
CC
Supply Voltage ● 37V
PV
CC
PV
CC
Supply Voltage (Note 2) ● 37V
BV
CC
BOOST Pin Voltage V
BOOST
– V
SW
(Note 2) ● 2.7 7 V
I
CC
V
CC
Supply Current Test Circuit 1 ● 2.2 8 mA
RUN/SS1 = RUN/SS2 = 0V (Note 5) ● 30 100 µA
IPV
CC
PV
CC
Supply Current Test Circuit 1 (Note 4) ● 2.2 6 mA
RUN/SS1 = RUN/SS2 = 0V (Note 5) ● 6 100 µA
I
BOOST
BOOST Pin Current Test Circuit 1 (Note 4) ● 1.3 3 mA
RUN/SS1 = RUN/SS2 = 0V ● 0.1 10 µA
V
FB
Feedback Voltage Test Circuit 1, LTC1703C ● 0.792 0.800 0.808 V
Test Circuit 1, LTC1703I ● 0.790 0.800 0.810 V
∆V
FB
Feedback Voltage Line Regulation V
CC
= 3V to 7V ● ±0.005 ±0.05 %/V
I
FB
Feedback Current FB2 Only (Note 8) ● ±0.001 ±1 µA
∆V
OUT
Output Voltage Load Regulation (Note 6) ● 0.1 ±0.2 %
V
FCB
FCB Threshold ● 0.75 0.8 0.85 V
∆V
FCB
FCB Feedback Hysteresis 20 mV
I
FCB
FCB Pin Current ● ±0.001 ±1 µA
V
RUN
RUN/SS Pin RUN Threshold ● 0.45 0.55 0.65 V
I
SS
Soft Start Source Current RUN/SS
n
= 0V – 1.5 – 3.5 – 5.5 µA
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= 5V unless otherwise specified. (Note 3)
ELECTRICAL CHARACTERISTICS
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
LTC1703
1703fa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: PV
CC
and BV
CC
(V
BOOST
– V
SW
) must be greater than V
GS(ON)
of
the external MOSFETs used to ensure proper operation.
Note 3: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground unless otherwise
specified.
Note 4: Supply current in normal operation is dominated by the current
needed to charge and discharge the external MOSFET gates. This current
will vary with supply voltage and the external MOSFETs used.
Note 5: Supply current in shutdown is dominated by external MOSFET
leakage and may be significantly higher than the quiescent current drawn
by the LTC1703, especially at elevated temperature.
Note 6: This parameter is guaranteed by correlation and is not tested
directly.
Note 7: Each built-in pull-up resistor attached to the VID inputs also has a
series diode connected to V
CC
to allow input voltages higher than the V
CC
supply without damage or clamping. (See Block Diagram.)
Note 8: Feedback current at FB1 will be higher due to internal VID
resistors.
Note 9: Rise and fall times are measured using 10% and 90% levels. Delay
and nonoverlap times are measured using 50% levels.
The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T
A
= 25°C. V
CC
= 5V unless otherwise specified. (Note 3)
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Switching Characteristics
V
OSC
Oscillator Amplitude 1V
P-P
f
OSC
Oscillator Frequency Test Circuit 1 ● 475 550 750 kHz
Φ
OSC2
Controller 2 Oscillator Phase Relative to Controller 1 180 DEG
DC
MIN1
Minimum Duty Cycle V
FB
< V
MAX
● 710 %
DC
MIN2
Minimum Duty Cycle V
FB
> V
MAX
● 0%
DC
MAX
Maximum Duty Cycle ● 87 90 93 %
t
NOV
Driver Nonoverlap Test Circuit 1 (Note 9) ● 40 100 ns
t
r
, t
f
Driver Rise/Fall Time Test Circuit 1 (Note 9) ● 12 80 ns
Feedback Amplifier
A
VFB
FB DC Gain ● 74 85 dB
GBW FB Gain Bandwidth 25 MHz
I
ERR
FB Sink/Source Current COMP
N
Output ● ±3 ±10 mA
V
MIN
MIN Comparator Threshold ● 760 785 mV
V
MAX
MAX Comparator Threshold ● 815 840 mV
Current Limit Loop
A
VILIM
I
LIM
Gain 40 dB
I
IMAX
I
MAX
Source Current I
MAX
= 0V, LTC1703C ● –7 –10 –13 µA
I
MAX
= 0V, LTC1703I ● –7 –10 –14 µA
Status Outputs
V
FAULT
FAULT Trip Point V
FB
Relative to Regulated V
OUT
● +10 +15 +20 %
V
OLF
FAULT Output Low Voltage I
FAULT
= 1mA ● 0.03 0.1 V
I
FAULT
FAULT Output Current V
FAULT
= 0V – 10 µA
t
FAULT
FAULT Delay Time V
FB
> V
FAULT
to FAULT (Note 9) 25 µs
VID Inputs
R11 Resistance Between SENSE and FB1 10 kΩ
V
OUT
Error % Output Voltage Accuracy (Side 1) Programmed from 0.9V to 2V ● –1.5 1.5 %
R
PULLUP
VID Input Pull-Up Resistance V
DIODE
= 0.6V (Note 7) 40 kΩ
VID
T
VID Input Voltage Threshold V
IL
(2.7V ≤ V
CC
≤ 5.5V) 0.4 V
V
IH
(2.7V ≤ V
CC
≤ 5.5V) 1.6 V
I
VID-LEAK
VID Input Leakage Current V
CC
< VID < 7V (Note 7) 0.01 ±1 µA
V
PULLUP
VID Pull-Up Voltage V
CC
= 3.3V 2.8 V
V
CC
= 5V 4.5 V
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LTC1703IG#TRPBF

Mfr. #:
Buy LTC1703IG#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 2x 550kHz Sync 2-PhSw Reg Cntr w/ 5-B VI
Lifecycle:
New from this manufacturer.
Delivery:
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