Datasheet LTC3414 (Analog Devices)
| 制造商 | Analog Devices |
| 描述 | 4A, 4MHz, Monolithic Synchronous Step-Down Regulator |
| 页数 / 页 | 16 / 1 — FEATURES. DESCRIPTIO. High Efficiency: Up to 95%. 4A Output Current. Low … |
| 文件格式/大小 | PDF / 280 Kb |
| 文件语言 | 英语 |
FEATURES. DESCRIPTIO. High Efficiency: Up to 95%. 4A Output Current. Low Quiescent Current: 64. Low RDS(ON) Internal Switch: 67m
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LTC3414 4A, 4MHz, Monolithic Synchronous Step-Down Regulator
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 95%
The LTC®3414 is a high efficiency monolithic synchro- ■
4A Output Current
nous, step-down DC/DC converter utilizing a constant ■
Low Quiescent Current: 64
μ
A
frequency, current mode architecture. It operates from an ■
Low RDS(ON) Internal Switch: 67m
Ω input voltage range of 2.25V to 5.5V and provides a ■ Programmable Frequency: 300KHz to 4MHz regulated output voltage from 0.8V to 5V while delivering ■ 2.25V to 5.5V Input Voltage Range up to 4A of output current. The internal synchronous ■ ±2% Output Voltage Accuracy power switch with 67mΩ on-resistance increases effi- ■ 0.8V Reference Allows Low Output Voltage ciency and eliminates the need for an external Schottky ■ Selectable Forced Continuous/Burst Mode® Operation diode. Switching frequency is set by an external resistor or with Adjustable Burst Clamp can be synchronized to an external clock. 100% duty cycle ■ Synchronizable Switching Frequency provides low dropout operation extending battery life in ■ Low Dropout Operation: 100% Duty Cycle portable systems. OPTI-LOOP® compensation allows the ■ Power Good Output Voltage Monitor transient response to be optimized over a wide range of ■ Overtemperature Protected loads and output capacitors. ■ Available in 20-Lead Exposed TSSOP Package The LTC3414 can be configured for either Burst Mode
U
operation or forced continuous operation. Forced continu-
APPLICATIO S
ous operation reduces noise and RF interference while ■ Point-of-Load Regulation Burst Mode operation provides high efficiency by reduc- ■ Notebook Computers ing gate charge losses at light loads. In Burst Mode ■ Portable Instruments operation, external control of the burst clamp level allows ■ Distributed Power Systems the output voltage ripple to be adjusted according to the , LTC and LT are registered trademarks of Linear Technology Corporation. requirements of the application. 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, 6580258, 6304066, 6127815, 6498466, 6611131, 6724174
U TYPICAL APPLICATIO
22μF VIN
LTC3414 Efficiency Curve
2.7V TO 5.5V 100 PV SV IN IN 95 Burst Mode OPERATION 2.2M RT PGOOD 90 0.47μH LTC3414 294k V 85 SW OUT 2.5V AT 4A 80 FORCED C RUN/SS OUT* CONTINUOUS PGND 75 1000pF RITH* I 70 TH SGND EFFICIENCY (%) SYNC/MODE V 65 FB 470pF 60 3414 F01a 110k 392k 55 75k 50 0.001 0.01 0.1 1.0 10 LOAD CURRENT (A) *Burst Mode OPERATION: COUT = 470μF SANYO POSCAP 4TPB470M, RITH = 20k FORCED CONTINUOUS: C 3414 F01b OUT = (2) 100μF TDKC4532X5ROJ107M, RITH = 12.1k
Figure 1. 2.5V/4A Step-Down Regulator
3414fb 1
U FEATURES DESCRIPTIO
■
High Efficiency: Up to 95%
The LTC®3414 is a high efficiency monolithic synchro- ■
4A Output Current
nous, step-down DC/DC converter utilizing a constant ■
Low Quiescent Current: 64
μ
A
frequency, current mode architecture. It operates from an ■
Low RDS(ON) Internal Switch: 67m
Ω input voltage range of 2.25V to 5.5V and provides a ■ Programmable Frequency: 300KHz to 4MHz regulated output voltage from 0.8V to 5V while delivering ■ 2.25V to 5.5V Input Voltage Range up to 4A of output current. The internal synchronous ■ ±2% Output Voltage Accuracy power switch with 67mΩ on-resistance increases effi- ■ 0.8V Reference Allows Low Output Voltage ciency and eliminates the need for an external Schottky ■ Selectable Forced Continuous/Burst Mode® Operation diode. Switching frequency is set by an external resistor or with Adjustable Burst Clamp can be synchronized to an external clock. 100% duty cycle ■ Synchronizable Switching Frequency provides low dropout operation extending battery life in ■ Low Dropout Operation: 100% Duty Cycle portable systems. OPTI-LOOP® compensation allows the ■ Power Good Output Voltage Monitor transient response to be optimized over a wide range of ■ Overtemperature Protected loads and output capacitors. ■ Available in 20-Lead Exposed TSSOP Package The LTC3414 can be configured for either Burst Mode
U
operation or forced continuous operation. Forced continu-
APPLICATIO S
ous operation reduces noise and RF interference while ■ Point-of-Load Regulation Burst Mode operation provides high efficiency by reduc- ■ Notebook Computers ing gate charge losses at light loads. In Burst Mode ■ Portable Instruments operation, external control of the burst clamp level allows ■ Distributed Power Systems the output voltage ripple to be adjusted according to the , LTC and LT are registered trademarks of Linear Technology Corporation. requirements of the application. 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, 6580258, 6304066, 6127815, 6498466, 6611131, 6724174
U TYPICAL APPLICATIO
22μF VIN
LTC3414 Efficiency Curve
2.7V TO 5.5V 100 PV SV IN IN 95 Burst Mode OPERATION 2.2M RT PGOOD 90 0.47μH LTC3414 294k V 85 SW OUT 2.5V AT 4A 80 FORCED C RUN/SS OUT* CONTINUOUS PGND 75 1000pF RITH* I 70 TH SGND EFFICIENCY (%) SYNC/MODE V 65 FB 470pF 60 3414 F01a 110k 392k 55 75k 50 0.001 0.01 0.1 1.0 10 LOAD CURRENT (A) *Burst Mode OPERATION: COUT = 470μF SANYO POSCAP 4TPB470M, RITH = 20k FORCED CONTINUOUS: C 3414 F01b OUT = (2) 100μF TDKC4532X5ROJ107M, RITH = 12.1k
Figure 1. 2.5V/4A Step-Down Regulator
3414fb 1