参数资料
型号: LTC3859IFE#TRPBF
厂商: Linear Technology
文件页数: 1/42页
文件大小: 0K
描述: IC REG CTRLR BST PWM CM 38-TSSOP
标准包装: 2,000
PWM 型: 电流模式,Burst Mode?
输出数: 3
频率 - 最大: 850kHz
占空比: 100%
电源电压: 4.5 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
包装: 带卷 (TR)
LTC3859
Low I Q , Triple Output,
Buck/Buck/Boost
Synchronous Controller
FEATURES
DESCRIPTION
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Dual Buck Plus Single Boost Synchronous Controllers
Outputs Remain in Regulation Through Cold Crank
Down to 2.5V
Low Operating I Q : 55μA (One Channel On)
Wide Bias Input Voltage Range: 4.5V to 38V
Buck Output Voltage Range: 0.8V ≤ V OUT ≤ 24V
Boost Output Voltage Up to 60V
R SENSE or DCR Current Sensing
100% Duty Cycle for Boost Synchronous MOSFET
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode ? Operation at Light Loads
Very Low Buck Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Low Shutdown I Q : 14μA
Small 38-Pin 5mm ¥ 7mm QFN and TSSOP Packages
The LTC ? 3859 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.
The 55μA no-load quiescent current extends operating runtime
in battery powered systems. OPTI-LOOP compensation allows
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.
Independent TRACK/SS pins for each controller ramp the output
voltages during start-up. Current foldback limits MOSFET heat
APPLICATIONS
dissipation during short-circuit conditions. The PLLIN/MODE
pin selects among Burst Mode operation, pulse-skipping mode,
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Automotive Always-On and Start-Stop Systems
Battery Operated Digital Devices
Distributed DC Power Systems
or continuous inductor current mode at light loads.
L , LT, LTC, LTM, Burst Mode, OPTI-LOOP and μModule are registered trademarks and
No R SENSE 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.
TYPICAL APPLICATION
V OUT3
REGULATED AT 10V WHEN V IN < 10V
FOLLOWS V IN WHEN V IN > 10V
220μF
499k
1μF
V FB3
V BIAS
Ef?ciency vs Input Voltage
68.1k
TG1
100
SENSE1
V IN
2.5V TO 38V
(START-UP ABOVE 5V)
220μF
2mΩ
1.2μH
TG3
SW3
BG3
LTC3859
SW1
BG1
+
4.9μH
6mΩ
V OUT1
5V
5A
95
90
85
80
V OUT1 = 5V
V OUT2 = 8.5V
SENSE3 –
SENSE1 –
75
4.7μF
SENSE3 +
INTV CC
V FB1
RUN1, 2, 3
68.1k
357k
220μF
70
65
BOOST1, 2, 3
EXTV CC
60
SW1, 2, 3
0.1μF
I TH1, 2, 3
TG2
SW2
BG2
6.5μH
8mΩ
V OUT2
8.5V
3A
55 FIGURE 12 CIRCUIT
I LOAD = 2A
50
0 5 10 15 20 25
INPUT VOLTAGE (V)
30
35
40
3859 TA01b
SENSE2+
TRACK/SS1, 2
SENSE2–
0.1μF
SS3
V FB2
PGND SGND
68.1k
649k
68μF
3859 TA01
3859fa
1
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