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参数资料
| 型号： | DC1227A |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR LTC3534 |
| 设计资源： | DC1227A Design Files DC1227A Schematic |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步升/步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 5V |
| 电流 - 输出： | 500mA（最小值） |
| 输入电压： | 3.6 ~ 7 V |
| 稳压器拓扑结构： | 降压-升压 |
| 频率 - 开关： | 1MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LTC3534 |
LTC3534
Regulated Output with Input Voltages Above,
2.4V to 7V V IN and 1.8V to 7V V OUT Ranges
5V V OUT at 500mA from 4 AA Cells
Single Inductor
Synchronous Rectification: Up to 94% Efficiency
Burst Mode ? Operation with 25μA I Q
Output Disconnect in Shutdown
1MHz Switching Frequency
<1μA Shutdown Current
Small Thermally Enhanced 16-Lead (5mm × 3mm ×
Medical Instruments
Portable Barcode Readers
Portable Inventory Terminals
USB to 5V Supply
Handheld GPS
FEATURES
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Below or Equal to the Output
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0.75mm) DFN and 16-Lead GN Packages
APPLICATIONS
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7V, 500mA Synchronous
Buck-Boost DC/DC
Converter
DESCRIPTION
The LTC ? 3534 is a wide V IN range, highly efficient, fixed
frequency, buck-boost DC/DC converter that operates
from input voltages above, below or equal to the output
voltage. The topology incorporated in the IC provides a
continuous transfer function through all operating modes,
making the product ideal for multi-cell Alkaline/NiMH or
single Lithium-Ion/Polymer applications where the output
voltage is within the battery voltage range.
The LTC3534 offers extended V IN and V OUT ranges of 2.4V
to 7V and 1.8V to 7V, respectively. Quiescent current is
only 25μA in Burst Mode operation, maximizing battery
life in portable applications. Burst Mode operation is user
controlled and can be enabled by driving the PWM pin
low. If the PWM pin is driven high then fixed frequency
switching is enabled.
Other features include fixed 1MHz operating frequency, a
<1μA shutdown, short-circuit protection, programmable
soft-start, current limit and thermal overload protection.
The LTC3534 is available in the thermally enhanced 16-lead
(3mm × 5mm) DFN and 16-lead GN packages.
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
4 AA Cells to 5V at 500mA Buck-Boost Converter
5μH
100
4 AA Cells to 5V Efficiency vs V IN
V IN
3.6V TO 6.4V
4 AA
CELLS
+
10μF
OFF ON
SW1
PV IN
V IN
LTC3534
RUN/SS
SW2
V OUT
FB
10k
33pF
15k
649k
V OUT
5V
22μF 500mA
95
90
85
PWM I OUT = 300mA
PWM I OUT = 500mA
BURST PWM
PWM V C
PGND1 GND PGND2 330pF
162k
80
3534 TA01a
75
3.6
4.0
4.4
4.8
5.2
5.6
6.0
6.4
V IN (V)
3534 TA01b
3534fb
For more information www.linear.com/LTC3534
1
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