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| 型号： | LTC3828 |
| 厂商： | Linear Technology Corporation |
| 英文描述： | 16-Bit Bus Transceiver With 3-State Outputs 48-SSOP -40 to 85 |
| 中文描述： | 双2相降压型跟踪控制器 |
| 文件页数： | 1/32页 |
| 文件大小： | 396K |
| 代理商： | LTC3828 |
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LTC3828
3828f
1
High Efficiency Dual 2.5V/3.3V Step-Down Converter with Tracking
FEATURES
DESCRIPTIOU
The LTC
3828 is a dual high performance step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant fre-
quency current mode architecture allows for a phase-
lockable frequency of up to 550kHz. The TRCKSS pin
provides both soft-start and tracking functions. Multiple
LTC3828s can be daisy-chained in applications requiring
more than two voltages to be tracked.
OPTI-LOOP
compensation allows the transient response
to be optimized over a wide range of output capacitance and
ESR values. The precision 0.8V reference and power good
output indicator are compatible with a wide 4.5V to 28V
(30V maximum) input supply range, encompassing all bat-
tery chemistries.
The RUN pins control their respective channels indepen-
dently. The FCB/PLLIN pin selects among Burst Mode
operation, skip-cycle mode and continuous current mode.
Current foldback limits MOSFET dissipation during short-
circuit conditions. Reverse current and current foldback
functions are disabled during soft-start.
APPLICATIU
TYPICAL APPLICATIO
U
Dual, 2-Phase Step-Down
Controller with Tracking
■
Dual, 180
°
Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
■
Tracking for Both Outputs
■
Constant Frequency Current Mode Control
■
Wide V
IN
Range: 4.5V to 28V Operation
■
Power Good Output Voltage Indicator
■
Adjustable Soft-Start Current Ramping
■
Foldback Output Current Limiting–
Disabled at Start-Up
■
No Reverse Current During Soft-Start Interval
■
Clock Output for 3-, 4-, 6-Phase Operation
■
Dual N-Channel MOSFET Synchronous Drive
■
±
1% Output Voltage Accuracy
■
Phase-Lockable Fixed Frequency 260kHz to 550kHz
■
OPTI-LOOP
Compensation Minimizes C
OUT
■
Very Low Dropout Operation: 99% Duty Cycle
■
Output Overvoltage Protection
■
Small 28-Lead SSOP and 5mm
×
5mm QFN
Packages
■
Telecom Infrastructure
■
ASIC Power Supply
■
Industry Equipment
+
4.7
μ
F
0.1
μ
F
63.4k 1%
1000pF
3.2
μ
H
220pF
1
μ
F
CERAMIC
22
μ
F
50V
CERAMIC
+
47
μ
F
4V
SP
0.01
20k
1%
20k
1%
15k
3.3V
5A
0.1
μ
F
0.1
μ
F
0.1
μ
F
42.5k
1%
3.2
μ
H
220pF
1000pF
+
56
μ
F
4V
SP
0.01
20k
1%
15k
2.5V
5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1
+
SENSE2
+
SENSE1
–
V
OSENSE1
TRCKSS2
SENSE2
–
V
OSENSE2
TRCKSS1
I
TH1
I
TH2
V
IN
PGOOD INTV
CC
RUN1
RUN2
4.5V TO 28V
3828 TA01
LTC3828
FCB/PLLIN
500kHz
TRCKSS1
63.4k 1%
, LTC and LT 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, 5705919, 5929620, 6144194, 6177787,
6304066, 6580258
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3828EG#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) |
| LTC3828EG#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 |
| LTC3828EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 4.5V to 28V Input 32-Pin QFN EP |
| LTC3828EUH#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: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 |
| LTC3828EUH#TRPBF | 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: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 |
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