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LTC3827IG-1-TRPBF

更新时间： 2024-09-23 05:43:55
品牌 Logo 应用领域
凌特 - Linear 控制器
页数 文件大小 规格书
32页 443K
描述
Low IQ, Dual, 2-Phase Synchronous Step-Down Controller

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LTC3827-1  
Low I , Dual, 2-Phase  
Q
Synchronous Step-Down Controller  
FEATURES  
DESCRIPTION  
The LTC®3827-1 is a high performance dual step-down  
switching regulator controller that drives all N-channel  
synchronouspowerMOSFETstages.Aconstantfrequency  
current mode architecture allows a phase-lockable fre-  
quency of up to 650kHz. Power loss and noise due to the  
ESRoftheinputcapacitorESRareminimizedbyoperating  
the two controller output stages out of phase.  
n
Wide Output Voltage Range: 0.8V ≤ V  
≤ 10V  
OUT  
n
Low Operating I : 80μA (One Channel On)  
Out-of-Phase Controllers Reduce Required Input  
Q
n
Capacitance and Power Supply Induced Noise  
OPTI-LOOP® Compensation Minimizes C  
n
n
n
n
n
OUT  
1ꢀ Output Voltage Accuracy  
Wide V Range: 4V to 36V Operation  
IN  
Phase-Lockable Fixed Frequency 140kHz to 650kHz  
Selectable Continuous, Pulse-Skipping or Low Ripple  
Burst Mode® Operation at Light Loads  
Dual N-Channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 99% Duty Cycle  
Adjustable Output Voltage Soft-Start or Tracking  
Output Current Foldback Limiting  
The 80μA no-load quiescent current extends operating  
life in battery-powered systems. OPTI-LOOP compensa-  
tion allows the transient response to be optimized over  
a wide range of output capacitance and ESR values. The  
LTC3827-1featuresaprecision0.8Vreferenceandapower  
goodoutputindicator. Awide4Vto36Vinputsupplyrange  
encompasses all battery chemistries.  
n
n
n
n
n
n
n
n
n
Power Good Output Voltage Monitor  
Output Overvoltage Protection  
Low Shutdown I : 8μA  
Independent TRACK/SS pins for each controller ramp the  
output voltage during start-up. Current foldback limits  
MOSFET heat dissipation during short-circuit conditions.  
Q
Internal LDO Powers Gate Drive from V or V  
IN  
OUT  
The PLLIN/MODE pin selects among Burst Mode opera-  
tion, pulse-skipping mode, or continuous inductor cur-  
rent mode at light loads. For a leadless package version  
(5mm × 5mm QFN) with additional features, see the  
LTC3827 data sheet.  
Small 28-Lead SSOP Package  
APPLICATIONS  
n
n
n
Automotive Systems  
Battery-Operated Digital Devices  
Distributed DC Power Systems  
L, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear  
Technology Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 5481178, 5929620, 6177787, 6144194, 5408150,  
6580258, 6304066, 5705919.  
TYPICAL APPLICATION  
High Efficiency Dual 8.5V/3.3V Step-Down Converter  
Efficiency and Power Loss  
vs Load Current  
V
IN  
4V TO 36V  
+
22μF  
50V  
100000  
10000  
1000  
100  
100  
90  
1μF  
4.7μF  
EFFICIENCY  
V
IN  
INTV  
CC  
V
= 12V; V  
= 3.3V  
IN  
OUT  
TG1  
TG2  
80  
0.1μF  
BOOST1  
SW1  
BOOST2  
SW2  
70  
7.2μH  
3.3μH  
0.1μF  
60  
50  
BG1  
BG2  
LTC3827-1  
PGND  
40  
30  
20  
10  
0
POWER LOSS  
10  
+
+
SENSE1  
SENSE1  
SENSE2  
0.015Ω  
0.015Ω  
1
–
–
SENSE2  
V
V
8.5V  
3.5A  
OUT1  
3.3V  
5A  
OUT2  
0.1  
V
V
FB1  
FB2  
0.001 0.01 0.1  
1
10 100 1000 10000  
62.5k  
192.5k  
I
I
TH2  
TH1  
TRACK/SS1 SGND TRACK/SS2  
0.1μF  
LOAD CURRENT (mA)  
220pF  
15k  
220pF  
15k  
150μF  
150μF  
38271 TA01b  
20k  
20k  
FIGURE 13 CIRCUIT  
0.1μF  
38271 TA01  
38271fe  
1
1234567...32

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