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參數資料
| 型號： | LTC3859IFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO38 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-38 |
| 文件頁數： | 1/42頁 |
| 文件大小： | 624K |
| 代理商： | LTC3859IFE#TRPBF |
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LTC3859
1
3859fa
TYPICAL APPLICATION
DESCRIPTION
Low IQ, Triple Output,
Buck/Buck/Boost
Synchronous Controller
The LTC3859 is a high performance triple output (buck/
buck/boost) synchronous DC/DC switching regulator
controller that drives all N-channel power MOSFET stages.
Constant frequency current mode architecture allows a
phase-lockable switching frequency of up to 850kHz. The
LTC3859 operates from a wide 4.5V to 38V input supply
range. When biased from the output of the boost converter
or another auxiliary supply, the LTC3859 can operate from
an input supply as low as 2.5V after start-up.
The55μAno-loadquiescentcurrentextendsoperatingruntime
inbatterypoweredsystems.OPTI-LOOPcompensationallows
the transient response to be optimized over a wide range of
output capacitance and ESR values. The LTC3859 features a
precision 0.8V reference for the bucks, 1.2V reference for the
boost and a power good output indicator.
IndependentTRACK/SSpinsforeachcontrollerramptheoutput
voltagesduringstart-up.CurrentfoldbacklimitsMOSFETheat
dissipation during short-circuit conditions. The PLLIN/MODE
pinselectsamongBurstModeoperation,pulse-skippingmode,
or continuous inductor current mode at light loads.
FEATURES
APPLICATIONS
n Dual Buck Plus Single Boost Synchronous Controllers
n Outputs Remain in Regulation Through Cold Crank
Down to 2.5V
n Low Operating IQ: 55μA (One Channel On)
n Wide Bias Input Voltage Range: 4.5V to 38V
n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n Boost Output Voltage Up to 60V
n RSENSE or DCR Current Sensing
n 100% Duty Cycle for Boost Synchronous MOSFET
n Phase-Lockable Frequency (75kHz to 850kHz)
n Programmable Fixed Frequency (50kHz to 900kHz)
n Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode Operation at Light Loads
n Very Low Buck Dropout Operation: 99% Duty Cycle
n Adjustable Output Voltage Soft-Start or Tracking
n Low Shutdown IQ: 14μA
n Small 38-Pin 5mm
7mm QFN and TSSOP Packages
n Automotive Always-On and Start-Stop Systems
n Battery Operated Digital Devices
n Distributed DC Power Systems
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP and μModule 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 5481178, 5705919,
5929620, 6144194, 6177787, 6580258.
3859 TA01
LTC3859
VFB3
TG3
BG3
SENSE3–
SENSE3+
INTVCC
BOOST1, 2, 3
ITH1, 2, 3
TRACK/SS1, 2
SS3
SW1
SENSE1+
SENSE1–
VFB1
RUN1, 2, 3
EXTVCC
TG2
SW2
BG2
SENSE2+
SENSE2–
VFB2
PGND
SGND
VBIAS
4.9μH
6mΩ
357k
220μF
1μF
68.1k
649k
68μF
68.1k
1.2μH
2mΩ
499k
4.7μF
SW1, 2, 3
0.1μF
VIN
2.5V TO 38V
(START-UP ABOVE 5V)
VOUT1
5V
5A
VOUT2
8.5V
3A
220μF
VOUT3
REGULATED AT 10V WHEN VIN < 10V
FOLLOWS VIN WHEN VIN > 10V
6.5μH
8mΩ
TG1
SW3
BG1
INPUT VOLTAGE (V)
0
EFFICIENCY
(%)
100
95
85
75
65
55
90
80
70
60
50
20
10
30
3859 TA01b
40
15
35
525
FIGURE 12 CIRCUIT
ILOAD = 2A
VOUT2 = 8.5V
VOUT1 = 5V
Efciency vs Input Voltage
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| LSN-1.2/10-D3H | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| LM3420AM5-8.2/NOPB | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| LM1575K-5.0/883 | 1.3 A SWITCHING REGULATOR, 52 kHz SWITCHING FREQ-MAX, MBFM4 |
相關代理商/技術參數 |
參數描述 |
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| LTC3859IUHF#PBF | 功能描述:IC REG CTRLR BST PWM CM 38VQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC3859IUHF#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 38VQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數:1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3860EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標準包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數:1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
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| LTC3860EUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
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