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參數(shù)資料
| 型號： | LTC3407IMSE-2#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.6 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 227K |
| 代理商： | LTC3407IMSE-2#TR |
LTC3407-2
1
34072fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Dual Synchronous, 800mA,
2.25MHz Step-Down
DC/DC Regulator
The LTC3407-2 is a dual, constant-frequency, synchro-
nous step down DC/DC converter. Intended for low power
applications, it operates from 2.5V to 5.5V input voltage
range and has a constant 2.25MHz switching frequency,
allowing the use of tiny, low cost capacitors and inductors
with a prole ≤1.2mm. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A power
switches provide high efciency without the need for
external Schottky diodes.
A user selectable mode input is provided to allow the user
to trade-off noise ripple for low power efciency. Burst
Mode operation provides high efciency at light loads,
while pulse-skipping mode provides low noise ripple at
light loads.
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle),
and both channels draw a total quiescent current of only
40μA. In shutdown, the device draws <1μA.
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators
n High Efciency: Up to 95%
n Very Low Quiescent Current: Only 40μA
n 2.25MHz Constant-Frequency Operation
n High Switch Current: 1.2A on Each Channel
n No Schottky Diodes Required
n Low RDS(ON) Internal Switches: 0.35Ω
n Current Mode Operation for Excellent Line
and Load Transient Response
n Short-Circuit Protected
n Low Dropout Operation: 100% Duty Cycle
n Ultralow Shutdown Current: IQ < 1μA
n Output Voltages from 5V down to 0.6V
n Power-On Reset Output
n Externally Synchronizable Oscillator
n Small Thermally Enhanced MSOP and 3mm
× 3mm
DFN Packages
n PDAs/Palmtop PCs
n Digital Cameras
n Cellular Phones
n Portable Media Players
n PC Cards
n Wireless and DSL Modems
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC3407-2 Efciency Curve
RUN2
VIN
VIN = 2.5V*
TO 5.5V
VOUT2 = 2.5V
AT 800mA
VOUT1 = 1.8V
AT 800mA
RUN1
POR
SW1
VFB1
GND
VFB2
SW2
MODE/SYNC
LTC3407-2
C1
10μF
R5
100k
RESET
C4, 22pF
C5, 22pF
L1
2.2μH
L2
2.2μH
R4
887k
R2
604k
R1
301k
R3
280k
C3
10μF
C2
10μF
3407 TA01
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML
L1, L2: MURATA LQH32CN2R2M33
*VOUT CONNECTED TO VIN FOR VIN 2.8V
LOAD CURRENT (mA)
1
EFFICIENCY
(%)
100
95
90
85
80
75
70
65
60
10
100
1000
3407 TA02
VIN = 3.3V
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
2.5V
1.8V
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