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| 型号： | LTC1434IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V/5V/ADJ 20SSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，可调 |
| 输入电压： | 3 V ~ 13.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 最高 700kHz |
| 电流 - 输出： | 450mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-SSOP |
LTC1433/LTC1434
450mA, Low Noise
Current Mode Step-Down
DC/DC Converters
FEATURES
DESCRIPTIO N
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High Efficiency: Up to 93%
Constant Frequency Adaptive Power TM Operation
Input Voltage Range: 3V to 13.5V
Internal 0.6 ? Power Switch (V IN = 10V)
Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector
Internal Power-On Reset Timer
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 470 μ A
Shutdown Mode Draws Only 15 μ A Supply Current
± 1% Reference Accuracy
Available in 16- and 20-Lead Narrow SSOP
The LTC ? 1433/LTC1434 are monolithic pulse width modu-
lated step-down DC/DC converters. By utilizing current
mode switching techniques, they provide excellent AC and
DC load and line regulation. Both devices operate at a fixed
frequency with the LTC1434 phase-lockable to an external
clock signal.
Both devices incorporate two internal P-channel power
MOSFETs with a parallel combined resistance of 0.6 ? (at
a supply of 10V). The Adaptive Power output stage selec-
tively drives one or both of the switches at frequencies up
to 700kHz to reduce switching losses and maintain high
efficiencies at low output currents.
APPLICATIO N S
The LTC1433/LTC1434 are capable of supplying up to
450mA of output current and boasts a ± 2.4% output
voltage accuracy. An internal low-battery detector has the
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Cellular Telephones
Portable Instruments
Wireless Modems
RF Communications
Distributed Power Systems
Scanners
Battery-Powered Equipment
same level of accuracy as the output voltage. A power-on
reset timer (POR) is included which generates a signal
delayed by 65536/f CLK (300ms typ) after the output is
within 5% of the regulated output voltage.
Ideal for current sensitive applications, the devices draw
only 470 μ A of quiescent current. In shutdown the devices
draw a mere 15 μ A. To further maximize the life of the
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
battery source, the internal P-channel MOSFET switch is
turned on continuously in dropout.
TYPICAL APPLICATIO N
0.1 μ F
68 μ F**
20V
LTC1433 Efficiency for
V OUT = 3.3V
100
5.1k
V OUT
3.3V
+
L1
100 μ H
100 μ F*
10V
D1
0.1 μ F
1
2
3
4
5
6
7
8
16
SSW PWRV IN
PGND 15
NC
14
BSW SV IN
LTC1433 13
NC C OSC
12
SGND POR
11
RUN/SS I TH
10
LBO V OSENSE
9
LBI V PROG
V IN
3.5V TO 12V
10k
POWER-ON
RESET
680pF
47pF
90
80
70
60
50
V IN = 5V
V IN = 9V
V IN = 12V
6800pF
40
D1: MOTOROLA MBRS130LT3
*AVX TPSD107M010R0100
1433/34 F01
0.001
0.01 0.1
1
L1: COILCRAFT D03316-104
** AVX TPSE686M020R0150
LOAD CURRENT (A)
Figure 1. High Efficiency Step-Down Converter
1433/34 TA01
1
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