参数资料
型号: LTC3735EUHF#TRPBF
厂商: Linear Technology
文件页数: 1/32页
文件大小: 0K
描述: IC CTRLR DC/DC 2PH HI EFF 38-QFN
标准包装: 2,500
应用: 控制器,Intel 移动式 CPU
输出数: 1
输出电压: 0.7 V ~ 1.71 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 38-WFQFN 裸露焊盘
供应商设备封装: 38-QFN(5x7)
包装: 带卷 (TR)
LTC3735
Output Stages Operate Antiphase
±1% Output Voltage Accuracy
6-Bit IMVP-IV VID Code: V OUT = 0.7V to 1.708V
Intel Compatible Power Saving Mode (PSIB)
Stage Shedding Improves Low Current Efficiency
Power Good Output with Adaptive Masking
Lossless Voltage Positioning
Dual Input Supply Capability for Load Sharing
Resistor Programmable V OUT at Boot-Up and Deeper
Resistor Programmable Deep Sleep Offset
Programmable Fixed Frequency: 210kHz to 550kHz
Adjustable Soft-Start Current Ramping
Foldback Output Current Limit
Short-Circuit Shutdown Timer with Defeat Option
Overvoltage Protection
Available in 36-Lead SSOP (0.209 Wide) and 38-Lead
Mobile and Desktop Computers
Internet Servers
FEATURES
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Sleep State
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(5mm × 7mm) Packages
APPLICATIONS
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TYPICAL APPLICATION
2-Phase, High Efficiency
DC/DC Controller for
Intel Mobile CPUs
DESCRIPTION
The LTC ? 3735 is a 2-phase synchronous step-down
switching regulator controller that drives all N-channel
power MOSFETs in a constant frequency architecture. The
output voltage is programmable by six VID bits during
normal operation and by external resistors during initial
boot-up and deeper sleep state. The LTC3735 drives its two
output stages out-of-phase at frequencies up to 550kHz
to minimize the RMS ripple currents in both input and
output capacitors. This antiphase technique also doubles
the apparent switching frequency, improving the transient
response while operating each phase at an optimum fre-
quency for efficiency. Thermal design is further simplified
by cycle-by-cycle current sharing between the two phases.
An Intel compatible PSIB input is provided to select between
two modes of operation. Fully enhanced synchronous
mode achieves a very small output ripple and very fast
transient response while power saving mode realizes
very high efficiency. OPTI-LOOP ? compensation allows
the transient response to be optimized for a wide range
of output capacitance and ESR values.
L , LT, LTC, LTM, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
SW1
BG1
VID5-VID0
SENSE1 –
232k
100pF
R C
4.74k
C C
470pF
0.1μF
MCH_PG TG1
DPRSLPVR
STP_CPUB
PSIB
FREQSET
PGND
PGOOD SENSE1 +
I TH
RUN/SS TG2
SW2
SGND BG2
M1
M2
M3
M4
1μH
D1
1μH
D2
0.002
0.002
+
C OUT
330μF
2V
× 5
V OUT
0.7V TO 1.708V
40A
V IN
5V TO 24V
C IN
10μF
35V
× 4
V OA +
LTC3735
4.5V TO 7V
PV CC
SENSE2 +
SENSE2 –
V OA +
4.7μF
0.47μF
BAT54A
SW2 SW1
0.47μF
RBOOT
BOOST1 RDPRSLP
BOOST2 RDPSLP
V OA+
OAOUT
V OA–
56.2k
13.3k
13.3k
12.7k
1.27M
549k
3735 F01
Figure 1. High Current 2-Phase Step-Down Converter
3735fa
1
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