Datasheet LTC3400, LTC3400B (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 600mA, 1.2MHz Micropower Synchronous Boost Converters in ThinSOT |
| 页数 / 页 | 12 / 1 — FEATURES. DESCRIPTIO. Up to 92% Efficiency. Generates 3.3V at 100mA from … |
| 文件格式/大小 | PDF / 223 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. Up to 92% Efficiency. Generates 3.3V at 100mA from a Single AA Cell. Low Start-Up Voltage: 0.85V
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文件文字版本
LTC3400/LTC3400B 600mA, 1.2MHz Micropower Synchronous Boost Converter in ThinSOT
U FEATURES DESCRIPTIO
■
Up to 92% Efficiency
The LTC®3400/LTC3400B are synchronous, fixed fre- ■
Generates 3.3V at 100mA from a Single AA Cell
quency, step-up DC/DC converters delivering high effi- ■
Low Start-Up Voltage: 0.85V
ciency in a 6-lead ThinSOT™ package. Capable of supplying ■
1.2MHz Fixed Frequency Switching
3.3V at 100mA from a single AA cell input, the devices ■
Internal Synchronous Rectifier
contain an internal NMOS switch and PMOS synchronous ■ 2.5V to 5V Output Range rectifier. ■ Automatic Burst Mode® Operation (LTC3400) A switching frequency of 1.2MHz minimizes solution ■ Continuous Switching at Light Loads (LTC3400B) footprint by allowing the use of tiny, low profile inductors ■ Logic Controlled Shutdown (< 1µA) and ceramic capacitors. The current mode PWM design is ■ Antiringing Control Minimizes EMI internally compensated, reducing external parts count. ■ Tiny External Components The LTC3400 features automatic shifting to power saving ■ Low Profile (1mm) SOT-23 Package Burst Mode operation at light loads, while the LTC3400B
U
features continuous switching at light loads. Antiringing
APPLICATIO S
control circuitry reduces EMI concerns by damping the ■ Pagers inductor in discontinuous mode, and the devices feature ■ MP3 Players low shutdown current of under 1µA. ■ Digital Cameras Both devices are available in the low profile (1mm) ■ LCD Bias Supplies SOT-23 package. ■ Handheld Instruments , LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation. ■ Wireless Handsets ThinSOT is a trademark of Linear Technology Corporation. ■ GPS Receivers
U TYPICAL APPLICATIO Efficiency
L1 100 4.7µH V + IN = 2.4V 1 SINGLE C1 90 AA CELL 4.7µF SW VOUT 6 5 V V IN OUT 3.3V 80 V R1 IN = 1.5V 100mA LTC3400 1.02M 4 3 1% C2 OFF ON SHDN FB 70 R2 4.7µF GND 604k EFFICIENCY (%) 60 2 1% 3400 F01 FIGURE 1 CIRCUIT C1, C2: TAIYO-YUDEN X5R EMK316BJ475ML 50 WITH OPTIONAL SCHOTTKY DIODE L1: COILCRAFT DO160C-472 (SEE APPLICATIONS INFORMATION) 40 0.1 1 10 100 1000
Figure 1. Single Cell to 3.3V Synchronous Boost Converter
LOAD CURRENT (mA) 3400 F01a 3400fa 1
U FEATURES DESCRIPTIO
■
Up to 92% Efficiency
The LTC®3400/LTC3400B are synchronous, fixed fre- ■
Generates 3.3V at 100mA from a Single AA Cell
quency, step-up DC/DC converters delivering high effi- ■
Low Start-Up Voltage: 0.85V
ciency in a 6-lead ThinSOT™ package. Capable of supplying ■
1.2MHz Fixed Frequency Switching
3.3V at 100mA from a single AA cell input, the devices ■
Internal Synchronous Rectifier
contain an internal NMOS switch and PMOS synchronous ■ 2.5V to 5V Output Range rectifier. ■ Automatic Burst Mode® Operation (LTC3400) A switching frequency of 1.2MHz minimizes solution ■ Continuous Switching at Light Loads (LTC3400B) footprint by allowing the use of tiny, low profile inductors ■ Logic Controlled Shutdown (< 1µA) and ceramic capacitors. The current mode PWM design is ■ Antiringing Control Minimizes EMI internally compensated, reducing external parts count. ■ Tiny External Components The LTC3400 features automatic shifting to power saving ■ Low Profile (1mm) SOT-23 Package Burst Mode operation at light loads, while the LTC3400B
U
features continuous switching at light loads. Antiringing
APPLICATIO S
control circuitry reduces EMI concerns by damping the ■ Pagers inductor in discontinuous mode, and the devices feature ■ MP3 Players low shutdown current of under 1µA. ■ Digital Cameras Both devices are available in the low profile (1mm) ■ LCD Bias Supplies SOT-23 package. ■ Handheld Instruments , LTC, LT and Burst Mode are registered trademarks of Linear Technology Corporation. ■ Wireless Handsets ThinSOT is a trademark of Linear Technology Corporation. ■ GPS Receivers
U TYPICAL APPLICATIO Efficiency
L1 100 4.7µH V + IN = 2.4V 1 SINGLE C1 90 AA CELL 4.7µF SW VOUT 6 5 V V IN OUT 3.3V 80 V R1 IN = 1.5V 100mA LTC3400 1.02M 4 3 1% C2 OFF ON SHDN FB 70 R2 4.7µF GND 604k EFFICIENCY (%) 60 2 1% 3400 F01 FIGURE 1 CIRCUIT C1, C2: TAIYO-YUDEN X5R EMK316BJ475ML 50 WITH OPTIONAL SCHOTTKY DIODE L1: COILCRAFT DO160C-472 (SEE APPLICATIONS INFORMATION) 40 0.1 1 10 100 1000
Figure 1. Single Cell to 3.3V Synchronous Boost Converter
LOAD CURRENT (mA) 3400 F01a 3400fa 1