參數(shù)資料
型號(hào)： LTC3860IUH#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PQCC32
封裝： 5 X 5 MM, LEAD FREE, PLASTIC, MO-220WHHD, QFN-32
文件頁(yè)數(shù)： 1/36頁(yè)
文件大?。?/td> 436K
代理商： LTC3860IUH#PBF
LTC3860
1
3860fc
TYPICAL APPLICATION
DESCRIPTION
Dual, Multiphase Step-Down
Voltage Mode DC/DC Controller
with Current Sharing
The LTC
3860 is a dual, PolyPhase synchronous step-
down switching regulator controller for high current
distributed power systems, digital signal processors, and
other telecom and industrial DC/DC power supplies. It uses
a constant frequency voltage mode architecture combined
with very low offset, high bandwidth error ampliers and
a remote output sense differential amplier for excellent
transient response and output regulation.
The controller incorporates lossless inductor DCR current
sensing to maintain current balance between phases and to
provide overcurrent protection. The chip operates from a
VCC supply between 3V and 5.5V and is designed for step-
down conversion from VIN between 3V and 24V to output
voltages between 0.6V and VCC – 0.5V.
The TRACK/SS pins provide programmable soft-start or
tracking functions. Inductor current reversal is disabled
during soft-start to safely power prebiased loads. The con-
stant operating frequency can be synchronized to an exter-
nal clock or linearly programmed from 250kHz to 1.25MHz.
Up to six LTC3860 controllers can operate in parallel for
1-, 2-, 3-, 4-, 6- or 12-phase operation.
The LTC3860 is available in a 32-pin 5mm × 5mm QFN
package.
FEATURES
APPLICATIONS
n Operates with Power Blocks, DRMOS or External
Gate Drivers and MOSFETs
n Constant Frequency Voltage Mode Control with
Accurate Current Sharing
n ±0.75% 0.6V Voltage Reference
n Differential Remote Output Voltage Sense Amplier
n Multiphase Capability—Up to 12-Phase Operation
n Programmable Current Limit
n Safely Powers a Prebiased Load
n Programmable or PLL-Synchronizable Switching
Frequency Up to 1.25MHz
n Lossless Current Sensing Using Inductor DCR or
Precision Current Sensing with Sense Resistor
n VCC Range: 3V to 5.5V
n VIN Range: 3V to 24V
n Power Good Output Voltage Monitor
n Output Voltage Tracking Capability
n Programmable Soft-Start
n Available in a 32- Pin 5mm × 5mm QFN Package
n High Current Distributed Power Systems
n Digital Signal Processor and ASIC Supplies
n Telecom Systems
n Industrial Power Supplies
L, LT, LTC, LTM, PolyPhase, μModule, Linear Technology and the Linear logo are registered
trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
6144194, 5055767
VINSNS
VCC
FREQ
FB2
ILIM2
FB1
COMP1,2
SS1,2
IN
VLOGIC
VCC
BOOST
GND
TG
TS
BG
RUN1,2
ILIM1
ISNS1P
ISNS1N
ISNS2N
ISNS2P
LTC3860
PWM1
LTC4449
VIN
SW1
0.3μH
SGND
CLKIN
VSNSOUT
VSNSN
VSNSP
PWM2
PWM1
470μF
1μF
0.22μF
TG1
BG1
VCC
0.22μF
100pF
1nF
0.1μF
220pF
12.7k
220Ω
50k
2.32k
20k
33pF
VOUT
VIN
VCC
IN
VLOGIC
VCC
BOOST
GND
TG
TS
BG
LTC4449
SW2
0.3μH
0.22μF
TG2
BG2
3860 TA01
330μF
4
VOUT
1.2V
50A
IAVG
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相關(guān)代理商/技術(shù)參數(shù)
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