參數(shù)資料
型號(hào)： LTC3412IFE#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 6.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 214K
代理商： LTC3412IFE#TR
LTC3412
1
3412fb
The LTC
3412 is a high efficiency monolithic synchro-
nous, step-down DC/DC converter utilizing a constant
frequency, current mode architecture. It operates from an
input voltage range of 2.625V to 5.5V and provides an
adjustable regulated output voltage from 0.8V to 5V while
delivering up to 2.5A of output current. The internal
synchronous power switch with 85mΩ on-resistance
increases efficiency and eliminates the need for an exter-
nal Schottky diode. Switching frequency is set by an
external resistor or can be sychronized to an external
clock. 100% duty cycle provides low dropout operation
extending battery life in portable systems. OPTI-LOOP
compensation allows the transient response to be opti-
mized over a wide range of loads and output capacitors.
The LTC3412 can be configured for either Burst Mode
operation or forced continuous operation. Forced con-
tinuous operation reduces noise and RF interference while
Burst Mode operation provides high efficiency by reduc-
ing gate charge losses at light loads. In Burst Mode
operation, external control of the burst clamp level allows
the output voltage ripple to be adjusted according to the
requirements of the application. To further maximize
battery life, the P-channel MOSFET is turned on continu-
ously in dropout (100% duty cycle).
■ Portable Instruments
■ Battery-Powered Equipment
■ Notebook Computers
■ Distributed Power Systems
■ Cellular Telephones
■ Digital Cameras
■ High Efficiency: Up to 95%
■ 2.5A Output Current
■ Low Quiescent Current: 62μA
■ Low RDS(ON) Internal Switches: 85mΩ
■ Programmable Frequency: 300kHz to 4MHz
■ No Schottky Diode Required
■ ±2% Output Voltage Accuracy
■ 0.8V Reference Allows Low Output Voltage
■ Selectable Forced Continuous/Burst Mode Operation
with Adjustable Burst Clamp
■ Synchronizable Switching Frequency
■ Low Dropout Operation: 100% Duty Cycle
■ Power Good Output Voltage Monitor
■ Overtemperature Protection
■ Available in 16-Lead Thermally Enhanced TSSOP
and QFN Packages
2.5A, 4MHz, Monolithic
Synchronous Step-Down Regulator
Figure 1. 2.5V, 2.5A Step-Down Regulator
Efficiency vs Load Current
SVIN
PVIN
PGOOD
SW
LTC3412
PGND
SGND
RUN/SS
309k
VIN
2.7V TO 5.5V
1000pF
RT
ITH
VFB
SYNC/MODE
1μH
4.7M
470pF
75k
100pF
100μF
VOUT
2.5V
2.5A
15k
110k
392k
22μF
3412 F01
LOAD CURRENT (A)
0.001
EFFICIENCY
(%)
100
80
60
40
20
0
10
3412 G01
VIN = 3.3V
VOUT = 2.5V
Burst Mode OPERATION
FORCED CONTINUOUS
0.1
1
0.01
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
, LT, LTC, LTM, Burst Mode and OPTI-LOOP are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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