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参数资料
| 型号： | LT1939EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/24页 |
| 文件大小： | 349K |
| 描述： | IC REG DL BUCK/LINEAR 12DFN |
| 标准包装： | 121 |
| 拓扑： | 降压（降压）（1），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 2 |
| 频率 - 开关： | 500kHz ~ 2.4MHz |
| 电压/电流 - 输出 1： | 0.8 V ~ 24.25 V，2A |
| 电压/电流 - 输出 2： | 0.8 V ~ 24.25 V，1A |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 3 V ~ 25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN |
| 包装： | 管件 |
LT1939
6
1939f
TYPICAL PERFORMANCE CHARACTERISTICS
Boost Current vs Switch Current
Minimum Boost Voltages vs
Temperature
Minimum Input Voltage
LDRV Dropout Voltage vs
Temperature
Inductor Value for 2A Maximum
Load Current (V
OUT
= 3.3V,
I
RIPPLE
= 250mA)
V
IN
(Pin 1): The V
IN
pin powers the internal control circuitry
and is monitored by an undervoltage comparator. The V
IN
pin is also connected to the collectors of the internal power
NPN switch and linear output NPN. The V
IN
pin has high
dI/dt edges and must be decoupled to ground close to
the pin of the device.
SHDN (Pin 2): The SHDN pin is used to shut down the
LT1939 and reduce quiescent current to a typical value
of 12糀. The accurate 0.76V threshold and input current
hysteresis can be used as an undervoltage lockout, prevent-
ing the regulator from operating until the input voltage has
reached a predetermined level. Force the SHDN pin above
its threshold or let it oat for normal operation.
SS (Pin 3): The SS pin is used to control the slew rate
of the output of both the switching and linear regulators.
A single capacitor from the SS pin to ground determines
the regulators ramp rate. For soft-start details see the
Applications Information section.
Switcher Dropout Operation
SWITCH CURRENT (A)
0
30
40
50
1.6
1939 G19
20
10
25
35
45
15
5
0
0.4
0.2
0.8
0.6
1.2 1.4 1.8
1.0
2.0
150癈
25癈
50癈
TEMPERATURE (癈)
50
1.5
1.7
1.9
2.1
2.3
0
50
100
150
1939 G20
2.5
2.7
25
25
75
125
MINIMUM BOOST FOR
SWITCH SATURATION
LOAD CURRENT (A)
0
8
7
6
5
4
3
2
1
0
1.6
1939 G21
0.4 0.8 1.2
2.0
1.4
0.2 0.6 1.0
1.8
V
OUT1
= 5V
V
OUT1
= 3.3V
F
SW
= 1MHz
L = 3.3糎
TEMPERATURE (癈)
50
1.00
1.05
1.15
1.20
1.25
1.50
1.35
0
50 75
1939 G22
1.10
1.40
1.45
1.30
25
25
100
125
150
I
LDRV
= 5mA
INPUT VOLTAGE (V)
2.5
0
1
2
3
4
6
3.0 3.5 4.0 4.5
1939 G23
5.0 5.5
5
I
OUT1
= 1A
V
OUT1
= 5V
V
OUT1
= 3.3V
INPUT VOLTAGE (V)
5
250
500
1000
1250
1500
2500
1939 G24
750
15
10
20
25
1750
2000
2250
L = 3.3糎
L = 4.7糎
L = 6.8糎
L = 10糎
L = 1.5糎
L = 2.2糎
L = 1糎
PIN FUNCTIONS
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1939EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
| LT1939IDD#PBF | 功能描述:IC REG DL BUCK/LINEAR 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT1939IDD#TRPBF | 功能描述:IC REG DL BUCK/LINEAR 12DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| LT1939IDD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
| LT1939IDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller |
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