Datasheet LTC3419 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | Dual Monolithic 600mA Synchronous Step-Down Regulator |
| 页数 / 页 | 16 / 1 — FEATURES. DESCRIPTION. High Effi ciency Dual Step-Down Outputs: Up to 96%. … |
| 文件格式/大小 | PDF / 264 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTION. High Effi ciency Dual Step-Down Outputs: Up to 96%. 600mA Current per Channel at VIN = 3V
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LTC3419 Dual Monolithic 600mA Synchronous Step-Down Regulator
FEATURES DESCRIPTION
n
High Effi ciency Dual Step-Down Outputs: Up to 96%
The LTC®3419 is a dual, 2.25MHz, constant-frequency, n
600mA Current per Channel at VIN = 3V
synchronous step-down DC/DC converter in a tiny n
Only 35μA Quiescent Current During Operation
3mm × 3mm DFN package. 100% duty cycle provides
(Both Channels)
low dropout operation, extending battery life in portable n
2.25MHz Constant-Frequency Operation
systems. Low output voltages are supported with the 0.6V n
2.5V to 5.5V Input Voltage Range
feedback reference voltage. Each regulator can supply n
Low Dropout Operation: 100% Duty Cycle
600mA output current. n
No Schottky Diodes Required
The input voltage range is 2.5V to 5.5V, making it ideal n
Internally Compensated for All Ceramic Capacitors
for Li-Ion and USB powered applications. Supply current n
Independent Internal Soft-Start for Each Channel
during operation is only 35μA and drops to <1μA in n Available in Fixed Output Versions shutdown. A user-selectable mode input allows the user n Current Mode Operation for Excellent Line and Load to trade off between high effi ciency Burst Mode operation Transient Response and pulse-skipping mode. n 0.6V Reference Allows Low Output Voltages n User-Selectable Burst Mode® Operation An internally set 2.25MHz switching frequency allows the n Short-Circuit Protected use of tiny surface mount inductors and capacitors. Internal n Ultralow Shutdown Current: I soft-start reduces inrush current during start-up. Both Q < 1μA n Available in Small MSOP or 3mm × 3mm DFN-8 outputs are internally compensated to work with ceramic Packages output capacitors. The LTC3419 is available in a low profi le (0.75mm) 3mm × 3mm DFN package. The LTC3419 is also
APPLICATIONS
available in a fi xed output voltage confi guration selected via internal resistor dividers (see Table 2). n Cellular Telephones , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n Digital Still Cameras Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, n Wireless and DSL Modems including 5481178, 6127815, 6304066, 6498466, 6580258, 6611131. n Portable Media Players n PDAs/Palmtop PCs
TYPICAL APPLICATION Effi ciency and Power Loss vs Output Current Dual Monolithic Buck Regulator in 8-Lead 3
×
3 DFN
100 10 VIN = 3.6V 90 VIN 2.5V TO 5.5V 80 1 10μF 70 POWER LOSS (W) RUN2 VIN RUN1 MODE 60 0.1 LTC3419 50 VOUT2 3.3μH 3.3μH VOUT1 1.8V AT SW2 SW1 2.5V AT 40 0.01 600mA 22pF 22pF 600mA EFFICIENCY (%) 30 20 0.001 V V V OUT = 1.2V FB2 FB1 118k GND 10 V 187k OUT = 1.8V 10μF 59k 59k 10μF V 0 OUT = 2.5V 0.0001 0.1 1 10 100 1000 3419 TA01 OUTPUT CURRENT (mA) 3419 TA01b 3419fa 1
FEATURES DESCRIPTION
n
High Effi ciency Dual Step-Down Outputs: Up to 96%
The LTC®3419 is a dual, 2.25MHz, constant-frequency, n
600mA Current per Channel at VIN = 3V
synchronous step-down DC/DC converter in a tiny n
Only 35μA Quiescent Current During Operation
3mm × 3mm DFN package. 100% duty cycle provides
(Both Channels)
low dropout operation, extending battery life in portable n
2.25MHz Constant-Frequency Operation
systems. Low output voltages are supported with the 0.6V n
2.5V to 5.5V Input Voltage Range
feedback reference voltage. Each regulator can supply n
Low Dropout Operation: 100% Duty Cycle
600mA output current. n
No Schottky Diodes Required
The input voltage range is 2.5V to 5.5V, making it ideal n
Internally Compensated for All Ceramic Capacitors
for Li-Ion and USB powered applications. Supply current n
Independent Internal Soft-Start for Each Channel
during operation is only 35μA and drops to <1μA in n Available in Fixed Output Versions shutdown. A user-selectable mode input allows the user n Current Mode Operation for Excellent Line and Load to trade off between high effi ciency Burst Mode operation Transient Response and pulse-skipping mode. n 0.6V Reference Allows Low Output Voltages n User-Selectable Burst Mode® Operation An internally set 2.25MHz switching frequency allows the n Short-Circuit Protected use of tiny surface mount inductors and capacitors. Internal n Ultralow Shutdown Current: I soft-start reduces inrush current during start-up. Both Q < 1μA n Available in Small MSOP or 3mm × 3mm DFN-8 outputs are internally compensated to work with ceramic Packages output capacitors. The LTC3419 is available in a low profi le (0.75mm) 3mm × 3mm DFN package. The LTC3419 is also
APPLICATIONS
available in a fi xed output voltage confi guration selected via internal resistor dividers (see Table 2). n Cellular Telephones , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n Digital Still Cameras Burst Mode is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, n Wireless and DSL Modems including 5481178, 6127815, 6304066, 6498466, 6580258, 6611131. n Portable Media Players n PDAs/Palmtop PCs
TYPICAL APPLICATION Effi ciency and Power Loss vs Output Current Dual Monolithic Buck Regulator in 8-Lead 3
×
3 DFN
100 10 VIN = 3.6V 90 VIN 2.5V TO 5.5V 80 1 10μF 70 POWER LOSS (W) RUN2 VIN RUN1 MODE 60 0.1 LTC3419 50 VOUT2 3.3μH 3.3μH VOUT1 1.8V AT SW2 SW1 2.5V AT 40 0.01 600mA 22pF 22pF 600mA EFFICIENCY (%) 30 20 0.001 V V V OUT = 1.2V FB2 FB1 118k GND 10 V 187k OUT = 1.8V 10μF 59k 59k 10μF V 0 OUT = 2.5V 0.0001 0.1 1 10 100 1000 3419 TA01 OUTPUT CURRENT (mA) 3419 TA01b 3419fa 1