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器件3D模型￥ 38.337
LTC3736EGN-1 数据手册 - Linear Technology（凌力尔特）
制造商:
Linear Technology（凌力尔特）
分类:
稳压芯片
封装:
SSOP
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
页面导航:
引脚图在P7Hot
典型应用电路图在P1P8P9P17P18
封装尺寸在P19
技术参数、封装参数在P3
应用领域在P1P11P12P13P14P15P16P17P18
电气规格在P3P4P5P6P11P14
导航目录
LTC3736EGN-1数据手册
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LTC3545/LTC3545-1
1
35451fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Triple 800mA Synchronous
Step-Down Regulator–2.25MHz
The LTC
®
3545/LTC3545-1 are triple, high efficiency,
monolithic synchronous buck regulators using a constant
frequency, current mode architecture. The regulators op-
erate independently with separate run pins. The 2.25V to
5.5V input voltage range makes the LTC3545/LTC3545-1
well suited for single Li-Ion battery-powered applications.
Low ripple pulse skip mode or high effi ciency Burst Mode
operation is externally selectable. PWM pulse skip mode
operation provides very low output ripple voltage while
Burst Mode operation increases effi ciency at low output
loads.
Switching frequency is internally set to 2.25MHz, or the
switching frequency can be synchronized to an external
1MHz to 3MHz clock. Power good indicators easily allow
power on sequencing between the three regulators.
The internal synchronous switches increase effi ciency and
eliminate external Schottky diodes. Low output voltages are
supported with the 0.6V feedback reference voltage.
The LTC3545-1 replaces the SYNC/MODE function with a
third PGOOD pin and forces Burst Mode operation.
■
Three 800mA Outputs
■
High Effi ciency: Up to 95%
■
2.25V to 5.5V Input Voltage Range
■
Low Ripple (<20mV
P-P
) Burst Mode
®
Operation
I
Q
: 58μA
■
2.25MHz Constant Frequency Operation or
■
Synchronizable to External 1MHz to 3MHz Clock
■
Power Good Indicators Ease Supply Sequencing
■
0.6V Reference Allows Low Output Voltages
■
Current Mode Operation/Excellent Transient Response
■
Low Profi le 16-Lead 3mm × 3mm QFN Package
■
Smart Phones
■
Wireless and DSL Modems
■
Digital Still Cameras
■
Portable Instruments
■
Point of Load Regulation
High Effi ciency Triple Step-Down Converter with Power Sequencing
Effi ciency and Loss vs Load Current
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6580258, 5481178, 6127815, 6498466, 6611131.
3545 TA01
L1
1.5µH
C5
10µF
PGNDGNDA
C4 10µF
C6
20pF
R2
255k
R1
511k
C1
10µF
V
OUT1
1.8V
V
IN
2.25V TO 5.5V
RUN1
PGOOD1
RUN2
PGOOD2
RUN3
L2
1.5µH
R4
226k
C2
10µF
V
OUT2
1.2V
SW2
V
FB2
SYNC/MODE
SW1
V
FB1
V
IN
PV
IN
LTC3545
GNDA PGND
R7
500k
C7
20pF
R3
226k
R8
500k
L3
1.5µH
R6
200k
C3
10µF
V
OUT3
1.5V
SW3
V
FB3
C8
20pF
R5
301k
LOAD CURRENT (A)
30
EFFICIENCY (%)
LOSS (W)
90
100
20
10
80
50
70
60
40
0.0001 0.01 0.1 1
3545 TA01b
0
0.001
1
0.1
0.01
0.0001
0.001
V
IN
= 2.5V
V
IN
= 3.6V
V
IN
= 4.2V
T
A
= 25°C
V
OUT
= 2V
Burst Mode OPERATION
f
OSC
= 2.25MHz
SINGLE CHANNEL
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