nous buck regulator using a constant frequency, current
mode architecture. Supply current during operation is
only 20μA, dropping to
≤1μA
in shutdown. The 2.5V to
5.5V input voltage range makes the LTC3564 ideally suited
for single Li-Ion battery-powered or 3.3V to 5V input
voltage applications. 100% duty cycle provides low drop-
out operation, extending battery life in portable systems.
Automatic Burst Mode
®
operation increases efficiency at
light loads, further extending battery runtime.
Switching frequency is internally set at 2.25MHz, allowing
the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and
eliminates the need for an external Schottky diode. Low
output voltages are easily supported with the 0.6V feed-
back reference voltage. The LTC3564 is available in low
profile (1mm) ThinSOT and 6-Lead (2mm
×
3mm) DFN
packages.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5481178, 6580258, 6304066, 6498466, 6611131.
APPLICATIO S
■
■
■
■
■
■
Cellular Telephones
Wireless and DSL Modems
Digital Still Cameras
Media Players
Portable Instruments
Point of Load Regulation
TYPICAL APPLICATIO
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
V
OUT
= 1.8V
1.1μH
V
IN
C
IN
22μF
CER
V
IN
SW
22pF
C
OUT
22μF
CER
634k
316k
3564 TA01a
V
OUT
1.8V
LTC3564
RUN
GND
V
FB
0
0.1
1
10
100
1000
OUTPUT CURRENT (mA)
U
10
1
POWER LOSS (W)
0.1
0.01
0.001
V
IN
= 2.7V
V
IN
= 3.6V
V
IN
= 4.2V
0.0001
0.00001
10000
3564 TA01b
U
U
3564f
1
LTC3564
ABSOLUTE
AXI U RATI GS
(Note 1)
Operating Junction Temperature Range
(Notes 2, 3, 6) ...................................... – 40°C to 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Input Supply Voltage .................................. – 0.3V to 6V
RUN, V
FB
Voltages ..................................... – 0.3V to V
IN
SW Voltage (DC) ......................... – 0.3V to (V
IN
+ 0.3V)
PI CO FIGURATIO
TOP VIEW
V
FB
1
GND 2
V
IN
3
5 RUN
4 SW
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 215°C/ W,
θ
JC
= 50°C/ W
ORDER I FOR ATIO
LEAD FREE FINISH
LTC3564ES5#PBF
LTC3564IS5#PBF
LTC3564EDCB#PBF
LTC3564IDCB#PBF
TAPE AND REEL
LTC3564ES5#TRPBF
LTC3564IS5#TRPBF
LTC3564EDCB#TRPBF
LTC3564IDCB#TRPBF
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating junction temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
SYMBOL
I
VFB
V
FB
ΔV
FB
I
PK
V
LOADREG
V
IN
PARAMETER
Feedback Current
Regulated Feedback Voltage
Reference Voltage Line Regulation
Peak Inductor Current
Output Voltage Load Regulation
Input Voltage Range
●
CONDITIONS
●
(Note 4)
V
IN
= 2.5V to 5.5V (Note 4)
V
IN
= 3V, V
FB
= 0.5V, Duty Cycle < 35%
2
U
U
W W
U
W
W
U
U
U
TOP VIEW
SW 1
PGND 2
V
IN
3
7
6 RUN
5 SGND
4 V
FB
DCB PACKAGE
6-LEAD (2mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 64°C/ W,
θ
JC
= 10.6°C/ W
EXPOSED PAD (PIN 7) IS SGND, MUST BE SOLDERED TO PCB
PART MARKING*
LTCYJ
LTCYJ
LDTQ
LDTQ
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
5-Lead Plastic TSOT-23
6-Lead (2mm
×
3mm) Plastic DFN
6-Lead (2mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
MIN
●
TYP
0.6
0.04
2.0
0.5
MAX
±30
0.6120
0.4
2.5
5.5
UNITS
nA
V
%/V
A
%
V
0.5880
1.5
2.5
3564f
LTC3564
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating junction temperature range, otherwise specifications are T
A
= 25°C.
V
IN
= 3.6V unless otherwise specified.
SYMBOL
I
S
PARAMETER
Input DC Bias Current
Active Mode
Sleep Mode
Shutdown
Oscillator Frequency
R
DS(ON)
of P-Channel FET
R
DS(ON)
of N-Channel FET
SW Leakage
RUN Threshold
RUN Leakage Current
Soft-Start Time
V
FB
from 10% to 90% Full Scale
CONDITIONS
(Note 5)
V
FB
= 0.5V or V
OUT
= 90%, I
LOAD
= 0A
V
FB
= 0.62V or V
OUT
= 103%, I
LOAD
= 0A
V
RUN
= 0V, V
IN
= 4.2V
V
FB
= 0.6V or V
OUT
= 100%
S5 Package
DCB Package
S5 Package
DCB Package
V
RUN
= 0V, V
SW
= 0V or 5V, V
IN
= 5V
●
●
●
MIN
TYP
300
20
0.1
MAX
400
35
1
2.7
0.2
0.2
±1
1.5
±1
1.2
UNITS
μA
μA
μA
MHz
Ω
Ω
Ω
Ω
μA
V
μA
ms
f
OSC
R
PFET
R
NFET
I
LSW
V
RUN
I
RUN
t
SOFTSTART
1.8
2.25
0.15
0.15
0.15
0.15
±0.01
0.3
0.6
1
±0.01
0.9
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliabilty and lifetime.
Note 2:
The LTC3564E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C to
125°C operating junction termperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3564I is guaranteed over the full –40°C to 125°C operating junction
temperature range. High junction temperatures degrade operating
lifetimes. Operating lifetime is derated at junction temperatures greater
than 125°C.
Note 3:
T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
LTC3564ES5: T
J
= T
A
+ (P
D
)(215°C/W)
LTC3564EDCB: T
J
= T
A
+ (P
D
)(64°C/W)
Note 4:
The LTC3564 is tested in a proprietary test mode.
Note 5:
Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
中风发生时，一切都是以秒来计算的。延误治疗可能导致大脑重大损伤。伦敦大学医学院的一位博士Alistair McEwan已经获得行为医学研究所(Action Medical Research)的同意，为急救人员开发一种无线诊断系统来减少时间延误。感谢抗血栓药物，一些病人在病情发作的三个小时之内可以完全恢复。但出血也会导致中风。医生在治疗之前需要确定发病原因，因为不适当的服用抗血栓药物会加重损害。...[详细]
控制器局部网CAN(Controller Area Network)属于现场总线的一种，是一种有效支持分布式控制或实时控制的串行通信网络，被公认为是最有前途的现场总线之一。 在工业控制系统中，电动执行器是电动单元组合仪表中一个很重要的执行单元。它由控制电路和执行机构两个在电路上完全独立的部分组成，可接收来自调节器的电控信号，将其线性地转换成机械转角或直线位移，用来操纵风门、挡板、阀门等...[详细]
随着阅读器与标签价格的降低和全球市场的扩大，射频标识 RFID(以下简称RFID)的应用与日俱增。标签既可由阅读器供电(无源标签)，也可以由标签的板上电源供电(半有源标签和有源标签)。由于亚微型无源 CMOS 标签的成本降低，库存和其他应用迅速增加。一些评估表明，随着无源标签的价格持续下降，几乎每一个售出产品的内部都将有一个 RFID 标签。由于无源 RFID 标签的重要性及其独特的工程实现...[详细]
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
