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參數資料
| 型號： | LTC3565IMSE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 4000 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數： | 1/22頁 |
| 文件大小： | 587K |
| 代理商： | LTC3565IMSE#TRPBF |
LTC3565
3565fa
Features
applications
Description
1.25A, 4MHz, Synchronous
Step-Down DC/DC Converter
The LTC3565 is a constant frequency, synchronous
step-down DC/DC converter. Intended for medium power
applications, it operates from a 2.5V to 5.5V input voltage
range and has a user-configurable operating frequency up
to 4MHz, allowing the use of tiny, low cost capacitors and
inductors 1mm or less in height. The output voltage is
adjustable from 0.6V to 5.5V. Internal synchronous power
switches provide high efficiency. The LTC3565’s current
mode architecture and external compensation allow the
transient response to be optimized over a wide range of
loads and output capacitors.
The LTC3565 can be configured for automatic power
saving Burst Mode operation (IQ = 40A) to reduce gate
charge losses when the load current drops below the level
required for continuous operation. For reduced noise and
RF interference, the SYNC/MODE pin can be configured to
skip pulses or provide forced continuous operation.
To further maximize battery life, the P-channel MOSFET
is turned on continuously in dropout (100% duty cycle).
In shutdown, the device draws <1A.
L
, LT, LTC, LTM, Linear Technology the Linear logo, Burst Mode and OPTI-LOOP are registered
trademarks of Linear Technology Corporation. Hot Swap and ThinSOT are trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 6580258, 6498466, 6611131.
Step-Down 2.5V/1.25A Regulator
n
High Efficiency: Up to 95%
n
VIN Range: 2.5V to 5.5V
n
High Frequency Operation: Up to 4MHz
n
Selectable Low Ripple (Typical 25mVp-p)
Burst Mode Operation: IQ = 40A
n
Stable with Ceramic Capacitors
n
Uses Tiny Capacitors and Inductor
n
Low RDS(ON) Internal Switches: 0.15Ω
n
Current Mode Operation for Excellent Line
and Load Transient Response
n
Short-Circuit Protected
n
Low Dropout Operation: 100% Duty Cycle
n
Low Shutdown Current: IQ ≤ 1A
n
Output Voltages from 0.6V to 5V
n
Synchronizable to External Clock
n
Supports Pre-Biased Outputs
n
Small 10-Lead (3mm
× 3mm) DFN or MSOP Package
n
Notebook Computers
n
Digital Cameras
n
Cellular Phones
n
Handheld Instruments
n
Board Mounted Power Supplies
SYNC/MODE
LTC3565
PVIN
SW
SVIN
RUN
PGOOD
ITH
RT
GND
VFB
2.2H
VOUT
2.5V
1.25A
VIN
2.5V TO 5.5V
22pF
931k
294k
680pF
3565 TA01a
22F
12.1k
22F
191k
OUTPUT CURRENT (mA)
0.1
1
10
0
EFFICIENCY
(%)
POWER
LOSS
(W)
40
30
100
1
0.1
0.01
0.001
0.0001
1000
100
10000
3565 TA01b
20
10
60
50
80
70
90
VIN = 2.7V
VIN = 3.6V
VIN = 4.2V
Efficiency and Power Loss vs Output Current
typical application
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