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参数资料
| 型号： | LTC3633IFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO28 |
| 封装： | LEAD FREE, PLASTIC, TSSOP-28 |
| 文件页数： | 1/28页 |
| 文件大小： | 384K |
| 代理商： | LTC3633IFE#TRPBF |
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LTC3633
1
3633f
n 3.6V to 15V Input Voltage Range
n 3A Output Current per Channel
n Up to 95% Efciency
n Low Duty Cycle Operation: 5% at 2.25MHz
n Selectable 0°/180° Phase Shift Between Channels
n Adjustable Switching Frequency: 500kHz to 4MHz
n External Frequency Synchronization
n Current Mode Operation for Excellent Line and
Load Transient Response
n 0.6V Reference Allows Low Output Voltages
n User Selectable Burst Mode Operation or Forced
Continuous Operation
n Output Voltage Tracking and Soft-Start Capability
n Short-Circuit Protected
n Overvoltage Input and Overtemperature Protection
n Low Power 2.5V Linear Regulator Output
n Power Good Status Outputs
n Available in (4mm × 5mm) QFN-28 and 28-Lead
TSSOP Packages
TYPICAL APPLICATION
DESCRIPTION
Dual Channel 3A, 15V
Monolithic Synchronous
Step-Down Regulator
The LTC3633 is a high efciency, dual-channel monolithic
synchronous buck regulator using a controlled on-time,
current mode architecture, with phase lockable switching
frequency. The two channels can run 180° out of phase,
which relaxes the requirements for input and output ca-
pacitance. The operating supply voltage range is from 3.6V
to 15V, making it suitable for dual cell lithium-ion batteries
as well as point of load power supply applications from
a 12V or 5V supply.
The operating frequency is programmable and synchroniz-
able from 500kHz to 4MHz with an external resistor. The
high frequency capability allows the use of small surface
mount inductors and capacitors. The unique constant
frequency/controlled on-time architecture is ideal for
high step-down ratio applications that operate at high
frequency while demanding fast transient response. An
internal phase lock loop servos the on-time of the internal
one-shot timer to match the frequency of the internal clock
or an applied external clock.
The LTC3633 can select between forced continuous mode
and high efciency Burst Mode operation.
FEATURES
APPLICATIONS
n Distributed Power Systems
n Battery Powered Instruments
n Point of Load Power Supplies
Efciency vs Load Current
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589,
6774611.
1
0
EFFICIENCY
(%)
10
30
40
50
70
100
10000
3633 TA01b
20
80
100
90
60
10
1000
VOUT = 5V
VOUT = 3.3V
LOAD CURRENT (mA)
Burst Mode
OPERATION
VIN = 12V
RUN1
RUN2
TRACKSS2
PGOOD2
LTC3633
BOOST2
0.1μF
1.5μH
73.2k
10k
SW2
VON2
VIN2
PGND
SGND
VIN1
VFB2
PHMODE
TRACKSS1
PGOOD1
BOOST1
SW1
VON1
VFB1
22μF
VOUT2
5V AT 3A
0.1μF
1μH
45.3k
10k
22μF
VOUT1
3.3V AT 3A
VIN
3.6V TO 15V
47μF
x2
MODE/SYNC
V2P5
RT
ITH1
ITH2
INTVCC
2.2μF
3633 TA01a
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