LTC1703I 查看數據表（PDF） - Linear Technology
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LTC1703I
Linear Technology
LTC1703I Datasheet PDF : 36 Pages
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LTC1703
BLOCK DIAGRA
VCC
OSC
550kHz
90% DUTY CYCLE
RUN/SS1,2
COMP1,2
4µA
SOFT
START
10µA
IMAX1,2
ILIM
FB
+–
MIN
800mV
760mV
SHUTDOWN TO
THIS CONTROLLER
500mV
FROM
OTHER
CONTROLLER
BURST
LOGIC
FCB
DRIVE
LOGIC
PVCC
DIS
10µA
MAX
840mV
0V 25µs
DELAY
FLT
920mV
FROM
OTHER
CONTROLLER
BOOST1,2
TG1,2
SW1,2
BG1,2
PGND
SGND
FAULT
FB1,2
40k
VCC
SHUTDOWN TO
ENTIRE CHIP
VID0
40k
VCC
VID1
40k
VCC
VID2
40k
VCC
VID3
40k
VCC
VID4
SWITCH
CONTROL
LOGIC
SENSE
R11
10k
TO FB1
RB1
1703 BD
APPLICATIO S I FOR ATIO
OVERVIEW
The LTC1703 is a dual, step-down (buck), voltage mode
feedback switching regulator controller. It is designed to
be used in a synchronous switching architecture with two
external N-channel MOSFETs per channel. It is intended to
operate from a low voltage input supply (7V maximum)
and provide a high power, high efficiency, precisely regu-
lated output voltage. Several features make it particularly
suited for microprocessor supply regulation. Output regu-
lation is extremely tight, with DC line and load regulation
and initial accuracy better than 1.5%, and total regulation
including transient response inside of 3.5% with a prop-
erly designed circuit. The 550kHz switching frequency
allows the use of physically small, low value external
components without compromising performance. An
onboard DAC sets the output voltage at channel 1, consis-
tent with the Intel mobile VID specification (Table 1).
The LTC1703’s internal feedback amplifier is a 25MHz
gain-bandwidth op amp, allowing the use of complex
multipole/zero compensation networks. This allows the
feedback loop to maintain acceptable phase margin at
higher frequencies than traditional switching regulator
controllers allow, improving stability and maximizing tran-
sient response. The 800mV internal reference allows
1703fa
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