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参数资料
| 型号： | LTC3523EUD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 16QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.62 V ~ 5.5 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz |
| 电流 - 输出： | 400mA，600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
LTC3523/LTC3523-2
Synchronous 600mA Step-Up
and 400mA Step-Down
DC/DC Converters
FEATURES
DESCRIPTION
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Dual High Ef?ciency DC/DC Converters:
Step-Up (V OUT = 1.8V to 5.25V, I SW = 600mA)
Step-Down (V OUT = 0.615V to 5.5V, I OUT = 400mA)
1.8V to 5.5V Input Voltage Range
Up to 94% Ef?ciency
Pin Selectable Burst Mode ? Operation
45μA Quiescent Current in Burst Mode Operation
1.2MHz (LTC3523) or 2.4MHz (LTC3523-2)
Switching Frequency
Independent Power Good Indicator Outputs
Integrated Soft-Start
Thermal and Overcurrent Protection
<3μA Quiescent Current in Shutdown
Small 16-Lead 3mm × 3mm × 0.75mm QFN Package
The LTC ? 3523/LTC3523-2 combine a 600mA step-up
DC/DC converter with a 400mA synchronous step-down
DC/DC converter in a tiny 3mm × 3mm package. The
1.2MHz/2.4MHz switching frequencies minimize the
solution footprint while maintaining high ef?ciency. Both
converters feature soft-start and internal compensation,
simplifying the design.
Both the step-up and step-down converters are current
mode controlled and utilize an internal synchronous rec-
ti?er for high ef?ciency. The step-up supports 0% duty
cycle operation and the step-down converter supports
100% duty cycle operation to extend battery run time.
If the MODE pin is held high, both converters automati-
cally transition between Burst Mode operation and PWM
Digital Cameras
Medical Instruments
Industrial Handhelds
GPS Navigators
APPLICATIONS
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operation improving light load ef?ciency. Fixed, low noise
1.2MHz/2.4MHz PWM operation is selected when MODE
is grounded.
The LTC3523/LTC3523-2 provide a sub-3μA shutdown
mode, overtemperature shutdown and current limit pro-
tection on both converters. The LTC3523/LTC3523-2 are
housed in a 16-lead 3mm × 3mm × 0.75mm QFN package.
L , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
LTC3523 Ef?ciency and Power
Loss vs Load Current
V IN
1.8V TO 3.2V
2-CELL
ALKALINE
V OUT1
STEP-UP
OUTPUT
3.3V
200mA
+
10μF
47μF
634k
4.7μH
V IN1
SW1
V OUT
FB1
PGOOD1
V IN2
LTC3523
V BAT
SW2
FB2
MODE
PGOOD2
4.7μH
V IN
10pF
511k
511k
V OUT2
STEP-DOWN
OUTPUT
10μF 1.2V
200mA
100
90
80
70
60
50
40
EFFICIENCY
P0WER LOSS
V IN = 2.4V
1000
100
10
365k
SHDN1 SHDN2
GND1 GND2 GND3
30
20
V OUT1 = 3.3V
V OUT2 = 1.2V
f OSC = 1.2MHz
1
10
STEP-UP
OFF ON
OFF ON
3523 TA01a
0
STEP-DOWN
0.1
0.1
1
10 100
1000
LOAD CURRENT (mA)
3523 TA01b
3523fb
1
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