参数资料
型号: LT1576CS8-5#PBF
厂商: Linear Technology
文件页数: 12/28页
文件大小: 0K
描述: IC REG BUCK 5V 1.5A 8SOIC
标准包装: 100
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 5V
输入电压: 5 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 200kHz
电流 - 输出: 1.5A
同步整流器:
工作温度: 0°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
LT1576/LT1576-5
APPLICATIO N S I N FOR M ATIO N
5. After making an initial choice, consider the secondary
things like output voltage ripple, second sourcing, etc.
Use the experts in the Linear Technology’s applica-
tions department if you feel uncertain about the final
choice. They have experience with a wide range of
inductor types and can tell you about the latest devel-
opments in low profile, surface mounting, etc.
Table 2
Output Capacitor
The output capacitor is normally chosen by its Effective
Series Resistance (ESR), because this is what determines
output ripple voltage. To get low ESR takes volume, so
physically smaller capacitors have high ESR. The ESR
range for typical LT1576 applications is 0.05 ? to 0.2 ? . A
typical output capacitor is an AVX type TPS, 100 μ F at 10V,
with a guaranteed ESR less than 0.1 ? . This is a “D” size
surface mount solid tantalum capacitor. TPS capacitors
VENDOR/
PART NO.
Coiltronics
CTX15-2
CTX33-2
CTX68-4
CTX15-1P
SERIES CORE
VALUE DC CORE RESIS- MATER- HEIGHT
( μ H) (Amps) TYPE TANCE( ? ) IAL (mm)
15 1.7 Tor 0.059 KM μ 6.0
33 1.4 Tor 0.106 KM μ 6.0
68 1.2 Tor 0.158 KM μ 6.4
15 1.4 Tor 0.087 52 4.2
are specially constructed and tested for low ESR, so they
give the lowest ESR for a given volume. The value in
microfarads is not particularly critical, and values from
22 μ F to greater than 500 μ F work well, but you cannot
cheat mother nature on ESR. If you find a tiny 22 μ F solid
tantalum capacitor, it will have high ESR, and output ripple
voltage will be terrible. Table 3 shows some typical solid
tantalum surface mount capacitors.
CTX33-2P
CTX68-4P
33
68
1.3
1.1
Tor
Tor
0.126
0.238
52
52
6.0
6.4
Table 3. Surface Mount Solid Tantalum Capacitor ESR
and Ripple Current
Sumida
E Case Size ESR (Max., ? ) Ripple Current (A)
CDRH74-150
CDH115-330
CDRH125-680
CDH74-330
15
33
68
33
1.47
1.68
1.5
1.45
SC
SC
SC
SC
0.081
0.082
0.12
0.17
Fer
Fer
Fer
Fer
4.5
5.2
6
5.2
AVX TPS, Sprague 593D
AVX TAJ
D Case Size
AVX TPS, Sprague 593D
0.1 to 0.3
0.7 to 0.9
0.1 to 0.3
0.7 to 1.1
0.4
0.7 to 1.1
Coilcraft
C Case Size
DO3308P-153
15
2
SC
0.12
Fer
3
AVX TPS
0.2 (typ)
0.5 (typ)
DO3316P-333
33
2
SC
0.1
Fer
5.21
DO3316P-683
68
1.4
SC
0.18
Fer
5.21
Many engineers have heard that solid tantalum capacitors
Pulse
are prone to failure if they undergo high surge currents.
PE-53602
PE-53604
PE-53632
PE-53633
35
73
22
40
1.4
1.3
2.7
2.7
Tor
Tor
Tor
Tor
0.166
0.290
0.063
0.085
Fer
Fer
Fer
Fer
9.1
9.1
9.1
10
This is historically true, and type TPS capacitors are
specially tested for surge capability, but surge ruggedness
is not a critical issue with the output capacitor. Solid
tantalum capacitors fail during very high turn-on surges,
Gowanda
which do not occur at the output of regulators. High
SMP3316-152K
SMP3316-332K
SMP3316-682K
15
33
68
3.5
2.3
1.7
SC
SC
SC
0.041
0.092
0.178
Fer
Fer
Fer
6
6
6
discharge surges, such as when the regulator output is
dead shorted, do not harm the capacitors.
Unlike the input capacitor, RMS ripple current in the
Tor = Toroid
SC = Semi-closed geometry
Fer = Ferrite core material
52 = Type 52 powdered iron core material
KM μ = Kool M μ
12
output capacitor is normally low enough that ripple cur-
rent rating is not an issue. The current waveform is
triangular with a typical value of 200mA RMS . The formula
to calculate this is:
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LT1576CS8-5SYNC 功能描述:IC REG BUCK 5V 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V,1.5V,1.8V,2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP,10-MSOP(0.118",3.00mm 宽)裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘
LT1576CS8-5SYNC#PBF 功能描述:IC REG BUCK 5V 1.5A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP(0.300",7.62mm) 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12
LT1576CS8-5SYNC#TR 功能描述:IC REG BUCK 5V 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:1.2V,1.5V,1.8V,2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP,10-MSOP(0.118",3.00mm 宽)裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘
LT1576CS8-5SYNC#TRPBF 功能描述:IC REG BUCK 5V 1.5A 8SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压(降压) 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP(0.300",7.62mm) 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12
LT1576CS8-SYNC 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压(升压) 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式,混合 频率 - 开关:600kHz 电流 - 输出:500mA 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:8-SOIC(0.154",3.90mm 宽) 包装:带卷 (TR) 供应商设备封装:8-SOIC