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| 型号： | LT1578IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.21V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1.5A |
| 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： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
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LT1578/LT1578-2.5
1.5A, 200kHz Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
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1.5A Switch Current
High Efficiency—Low Loss 0.2 ? Switch
Constant 200kHz Switching Frequency
4V to 15V Input VoltageRange
Minimum Output: 1.21V
Low Supply Current: 1.9mA
Low Shutdown Current: 20 μ A
Easily Synchronizable Up to 400kHz
Cycle-by-Cycle Current Limit
Reduced EMI Generation
Low Thermal Resistance SO-8 Package
Uses Small Low Value Inductors
The LT ? 1578 is a 200kHz monolithic buck mode switching
regulator. A 1.5A switch is included on the die along with
all the necessary oscillator, control and logic circuitry. The
topology is current mode for fast transient response and
good loop stability. The LT1578 is a modified version of the
LT1507 that has been optimized for noise sensitive appli-
cations. It will operate over a 4V to 15V input range.
In addition, the reference voltage has been lowered to al-
low the device to produce output voltages down to 1.2V.
Quiescent current has been reduced by a factor of two.
Switch on resistance has been reduced by 30%. Switch tran-
sition times have been slowed to reduce EMI generation.
The oscillator frequency has been reduced to 200kHz to
APPLICATIO S
maintain high efficiency over a wide output current range.
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Portable Computers
Battery-Powered Systems
Battery Chargers
Distributed Power Systems
The pinout has been changed to improve PC layout by al-
lowing the high current, high frequency switching circuitry
to be easily isolated from low current, noise sensitive con-
trol circuitry. The new SO-8 package includes a fused
ground lead that significantly reduces the thermal resistance
of the device to extend the ambient operating temperature
range. Standard surface mount external parts can be used
including the inductor and capacitors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO N
Efficiency vs Load Current
3.3V Buck Converter
90
C3*
INPUT
5V TO 15V
10 μ F TO
50 μ F
+
V IN
BOOST
C2
0.33 μ F
V SW
L1**
15 μ H
D2
1N914
OUTPUT**
3.3V, 1.25A
85
80
75
LT1578
70
OPEN = ON
SHDN
GND
V C
FB
R1
65
+
* RIPPLE CURRENT RATING ≥ I OUT /2
** INCREASE L1 TO 30 μ H FOR LOAD
CURRENTS ABOVE 0.6A AND TO
60 μ H ABOVE 1A
SEE APPLICATIONS INFORMATION
C C
100pF
D1
1N5818
8.66k
R2
4.99k
C1
100 μ F, 10V
SOLID
TANTALUM
1578 TA01
60
55
50
0
V OUT = 3.3V
V IN = 5V
L = 25 μ H
0.25 0.50 0.75 1.00
1.25
1.50
LOAD CURRENT (A)
1578 TA02
1
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| LT1579CGN#PBF | 功能描述:IC LDO REG SMART DUAL ADJ 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
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