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参数资料
| 型号： | LTC3822EDD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 12-DFN |
| 标准包装： | 121 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 850kHz |
| 占空比： | 99% |
| 电源电压： | 2.75 V ~ 4.5 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 ~ 85°C |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 包装： | 管件 |
LTC3822-1
No R SENSE TM , Low Input
Voltage, Synchronous
Step-Down DC/DC Controller
FEATURES
DESCRIPTION
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■
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Dual N-Channel MOSFET Synchronous Drive
No Current Sense Resistor Required
Optimized for 3.3V IN and Li-Ion Applications
Constant Frequency Current Mode Operation for
Excellent Line and Load Transient Response
±1% 0.6V Reference
Low Dropout Operation: 99% Duty Cycle
Phase-Lockable or Adjustable Frequency:
250kHz to 750kHz
Internal Soft-Start Circuitry
Tracking and Adjustable Soft-Start Input
Selectable Maximum Peak Current Sense Threshold
Selectable Burst Mode ? / Forced Continuous/Pulse
Skipping Mode at Light Load
Digital RUN Control Pin
Output Overvoltage Protection
Micropower Shutdown: I Q = 7.5μA
Tiny Thermally Enhanced 12-Pin (3mm × 3mm) DFN
or 16-Pin Narrow SSOP Packages
The LTC ? 3822-1 is a synchronous step-down switching
regulator controller that drives external N-channel power
MOSFETs using few external components. The constant
frequency current mode architecture with MOSFET V DS
sensing eliminates the need for sense resistors and im-
proves ef?ciency.
Burst Mode operation provides high ef?ciency at light
loads. The 99% maximum duty cycle provides low dropout
operation, extending operating time in battery-powered
systems.
The operating frequency can be programmed up to 750kHz,
allowing the use of small surface mount inductors and ca-
pacitors. For noise sensitive applications, the LTC3822-1
can be synchronized to an external clock from 250kHz to
750kHz.
The LTC3822-1 is available in the tiny footprint thermally
enhanced 12-pin DFN package or 16-pin narrow SSOP
package.
APPLICATIONS
Light Load
LTC3822-1 LTC3822
Continuous, Discontinuous Discontinuous Mode
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Single Cell Li-Ion Powered Systems
3.3V IN Systems
Operation
Package
or Burst Mode Operation
DD12 (3mm × 3mm), GN16 DD10 (3mm × 3mm),
MS10E
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology
Corporation. No R SENSE is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by Patents, including 5481178, 5929620, 6580258, 6304066, 5847554,
6611131, 6498466, 5705919.
TYPICAL APPLICATION
Tracking/Soft-Start Yes Internal Soft-Start Only
External Sync Yes No
PGOOD Pin GN16 Only No
Ef?ciency/Power Loss vs Load Current
100 10
IPRG
RUN
V IN
47 μ F
× 2
V IN
3.3V
90
80
70
Burst Mode
EFFICIENCY
1
10.2k
1nF
PLLLPF TG
LTC3822-1
I TH SW
BOOST
SYNC/MODE
TRACK/SS
0.1 μ F
0.47 μ H
V OUT
1.8V
47 μ F 8A
× 2
60
50
40
30
Burst Mode
POWER LOSS
0.1
0.01
GND
V FB
BG
GND
20
10
0
V IN = 3.3V
V OUT = 1.8V
FIGURE 10 CIRCUIT
0.001
38221 TA01
10
100 1000
10000
59k
118k
LOAD CURRENT (mA)
38221 TA01b
38221f
1
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| LTC3822EGN-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3822EGN-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3822EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3822EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3823EGN#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:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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