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LTC3736EGN-1#TRPBF 数据手册 - Linear Technology（凌力尔特）
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Linear Technology（凌力尔特）
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稳压芯片
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SSOP-24
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LTC3736EGN-1#TRPBF数据手册
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1
LTC3736-1
37361f
Dual 2-Phase, No R
SENSE
TM
,
Synchronous Controller with
Spread Spectrum
Low Noise, 2-Phase, Dual Synchronous DC/DC Step-Down Converter
■
Spread Spectrum Operation
■
Tracking Function
■
No Current Sense Resistors Required
■
Out-of-Phase Controllers Reduce Required
Input Capacitance
■
Wide V
IN
Range: 2.75V to 9.8V
■
Current Mode Operation
■
0.6V ±1.5% Voltage Reference
■
Low Dropout Operation: 100% Duty Cycle
■
Pulse Skipping Operation at Light Loads
■
Internal Soft-Start Circuitry
■
Power Good Output Voltage Monitor
■
Output Overvoltage Protection
■
Micropower Shutdown: I
Q
= 9µA
■
Tiny Low Profile (4mm × 4mm) QFN and Narrow
SSOP Packages
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®
3736-1 is a 2-phase dual synchronous step-
down switching regulator controller with tracking that
drives external complementary power MOSFETs using
few external components. The constant frequency current
mode architecture with MOSFET V
DS
sensing eliminates
the need for sense resistors and improves efficiency.
Power loss and noise due to the ESR of the input capaci-
tance are minimized by operating the two controllers out
of phase.
A unique spread spectrum architecture randomly varies
the LTC3736-1’s switching frequency from 450kHz to
580kHz, significantly reducing the peak radiated and con-
ducted noise on both the input and output supplies,
making it easier to comply with electromagnetic interfer-
ence (EMI) standards.
Pulse skipping operation provides high efficiency at light
loads. 100% duty cycle capability provides low dropout op-
eration, extending operating time in battery-powered sys-
tems. The high switching frequencies allow for the use of
small surface mount inductors and capacitors.
The LTC3736-1 is available in the low profile (0.75mm)
24-pin thermally enhanced (4mm × 4mm) QFN package
and 24-lead narrow SSOP packages.
No R
SENSE
is a trademark of Linear Technology Corporation.
Protected by U.S. Patents including 5481178, 5929620, 6144194, 6580258, 6304066,
6611131, 6498466.
■
One or Two Lithium-Ion Powered Devices
■
Notebook and Palmtop Computers, PDAs
■
Portable Instruments
■
Distributed DC Power Systems
+
SENSE1
+
V
IN
LTC3736-1
SGND
SENSE2
+
TG1 TG2
SW1 SW2
BG1 BG2
PGND PGND
V
FB1
V
FB2
220pF
V
OUT1
2.5V
V
OUT2
1.8V
47µF
+
47µF
15k
220pF
15k
59k
59k
187k
118k
2.2µH
2.2µH
I
TH1
37361 TA01a
I
TH2
10µF
×2
V
IN
2.75V TO 9.8V
410k 450k 490k 530k 570k 610k
SPREAD SPECTRUM
ENABLED
SPREAD SPECTRUM
DISABLED
FREQUENCY (Hz)
–80
AMPLITUDE (dBm)
–20
–10
–90
–100
–30
–60
–40
–50
–70
37361 TA01b
–110
FIGURE 13 CIRCUIT
V
OUT
= 2.5V
R
BW
= 30Hz
Output Voltage Frequency
Spectrum
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
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