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| 型号： | LT3501EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A DL 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 23.8 V |
| 输入电压： | 3.1 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 250kHz ~ 1.5MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
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LT3501
Wide Input Range: 3.1V to 25V
Two Switching Regulators with 3A Output Capability
Independent Supply to Each Regulator
Adjustable/Synchronizable Fixed Frequency
Antiphase Switching
Outputs Can be Paralleled
Independent, Sequential, Ratiometric or Absolute
Independent Soft-Start and Power Good Pins
Enhanced Short-Circuit Protection
Low Dropout: 95% Maximum Duty Cycle
Low Shutdown Current: <10μA
20-Lead TSSOP Package with Exposed Leadframe
DSP Power Supplies
Disc Drives
DSL/Cable Modems
Wall Transformer Regulation
Distributed Power Regulation
FEATURES
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Operation from 250kHz to 1.5MHz
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Tracking Between Outputs
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APPLICATIONS
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L , LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
Monolithic Dual Tracking
3A Step-Down Switching
Regulator
DESCRIPTION
The LT ? 3501 is a dual-current mode PWM step-down
DC/DC converter with two internal 3.5A switches. Inde-
pendent input voltage, feedback, soft-start and power
good pins for each channel simplify complex power
supply tracking/sequencing requirements.
Both converters are synchronized to either a common
external clock input or a resistor programmable fixed
250kHz to 1.5MHz internal oscillator. At all frequencies, a
180° phase relationship between channels is maintained,
reducing voltage ripple and component size. Programmable
frequency allows for optimization between efficiency and
external component size.
Minimum input-to-output voltage ratios are improved
by allowing the switch to stay on through multiple clock
cycles, only switching off when the boost capacitor needs
recharging, resulting in ~95% maximum duty cycle.
Each output can be independently disabled using its own
soft-start pin, or by using the SHDN pin the entire part can
be placed in a low quiescent current shutdown mode.
The LT3501 is available in a 20-lead TSSOP package with
exposed leadframe for low thermal resistance.
3.3V and 1.8V Dual 3A Step-Down Converter with Output Tracking
Efficiency
V IN , 12V
4.7μF
100
90
V OUT1 = 5V
V OUT1 = 3.3 V
4.7μH
0.47μF
V IN1
SHDN
BST1
SW1
V IN2
R T /SYNC
BST2
SW2
61.9k
0.47μF
3.3μH
80
70
60
50
V OUT1 = 1.8V
V OUT1 = 2.5 V
PMEG4005
PMEG4005
B360A
LT3501
B360A
40
V OUT1
3.3V, 3A
47μF
8.06k
24.9k
10pF
470pF
40.2k
IND1 IND2
V OUT1 V OUT2
PG1 PG2
FB1 FB2
V C1 V C2
SS/TRACK1 SS/TRACK2
GND
0.1μF
470pF
40.2k
10k
47pF
V OUT2
1.8V, 3A
100μF
8.06k
3501 TA01a
30
20
10
0
0
0.5
V IN = 12V
I OUT2 = 0A
FREQUENCY = 500kHz
1 1.5 2 2.5 3
LOAD CURRENT (A)
3501 TA01b
3501fd
1
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