参数资料
型号: LTC3826IUH#PBF
厂商: Linear Technology
文件页数: 1/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32-QFN
标准包装: 73
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 585kHz
占空比: 99.4%
电源电压: 4 V ~ 36 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 管件
LTC3826
30μA I Q , Dual, 2-Phase
Synchronous Step-Down Controller
FEATURES
DESCRIPTION
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Wide Output Voltage Range: 0.8V ≤ V OUT ≤ 10V
Ultralow Operating I Q : 30μA (One Channel On)
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
OPTI-LOOP ? Compensation Minimizes C OUT
±1% Output Voltage Accuracy
Wide V IN Range: 4V to 36V Operation
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
Power Good Output Voltage Monitor
Output Overvoltage Protection
Low Shutdown I Q : 4μA
Internal LDO Powers Gate Drive from V IN or V OUT
Small 5mm × 5mm QFN Package
The LTC ? 3826 is a high performance dual step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant frequency
current mode architecture allows a phase-lockable fre-
quency of up to 650kHz. Power loss and noise due to the
ESR of the input capacitor are minimized by operating the
two controller output stages out of phase.
The 30μA 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
LTC3826 features a precision 0.8V reference and a power
good output indicator. A wide 4V to 36V input supply range
encompasses all battery chemistries.
Independent TRACK/SS pins for each controller ramp the
output voltage during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode opera-
APPLICATIONS
tion, pulse skipping mode, or continuous inductor cur-
rent mode at light loads. For a leaded package version
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Automotive Systems
Battery-Operated Digital Devices
Distributed DC Power Systems
(28-lead SSOP), see the LTC3826-1 data sheet.
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
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 Ef?ciency Dual 8.5V/3.3V Step-Down Converter
V IN
Ef?ciency and Power Loss
vs Load Current
V IN
INTV CC
4.7μF
22μF
50V
4V TO 36V
100
90
10000
TG1
TG2
80
1000
3.3μH
0.1μF
BOOST1
BOOST2
0.1μF
7.2μH
70
0.015Ω
SW1
BG1
SENSE1 +
LTC3826
SW2
BG2
PGND
SENSE2 +
0.015Ω
60
50
40
30
20
100
10
1
V OUT1
3.3V
5A
62.5k
SENSE1 –
V FB1
I TH1
SENSE2 –
V FB2
I TH2
192.5k
V OUT2
8.5V
3.5A
10
FIGURE 13 CIRCUIT
0 0.1
0.00001 0.0001 0.001 0.01 0.1 1 10
OUTPUT CURRENT (A)
150μF
20k
220pF
TRACK/SS1 SGND TRACK/SS2
220pF
20k
150μF
3826 TA01b
15k
0.1μF
0.1μF
15k
3826 TA01
3826fc
1
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LTC3827EG-1 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 4V to 36V Input 28-Pin SSOP
LTC3827EG-1#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
LTC3827EG-1#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC3827EUH#PBF 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP(0.173",4.40mm 宽) 包装:带卷 (TR)
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