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| 型号： | LTC1430CS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CNTRLR STEP-DWN 16SOIC |
| 标准包装： | 2,500 |
| 应用： | 控制器，Intel Pentium? |
| 输入电压： | 4 V ~ 8 V |
| 输出数： | 1 |
| 输出电压： | 3.3V，可调 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
LTC1430
APPLICATIO S I FOR ATIO
OS-CON part number 10SA220M (220 μ F/10V) capacitors
feature 2.3A allowable ripple current at 85 ° C and 0.035 ?
ESR; three in parallel at the input and six at the output will
meet the above requirements.
Input Supply Considerations/Charge Pump
The 16-lead LTC1430 requires four supply voltages to
operate: PV CC for the main power input, PV CC1 and PV CC2
for MOSFET gate drive and a clean, low ripple V CC for the
LTC1430 internal circuitry (Figure 6). In many applica-
tions, PV CC and PV CC2 can be tied together and fed from
a common high power supply, provided that the supply
voltage is high enough to fully enhance the gate of external
MOSFET M2. This can be the 5V system supply if a logic
level MOSFET is used for M2. V CC can usually be filtered
with an RC from this same high power supply; the low
quiescent current (typically 350 μ A) allows the use of
relatively large filter resistors and correspondingly small
filter capacitors. 100 ? and 4.7 μ F usually provide ad-
equate filtering for V CC .
For both versions of the LTC1430, PV CC1 must be higher
than PV CC by at least one external MOSFET V GS(ON) to fully
enhance the gate of M1. This higher voltage can be
provided with a separate supply (typically 12V) which
should power up after PV CC , or it can be generated with a
simple charge pump (Figure 4). The charge pump consists
of a 1N4148 diode from PV CC to PV CC1 and a 0.1 μ F
capacitor from PV CC1 to the switching node at the drain of
M2. This circuit provides 2PV CC – V F to PV CC1 while M1 is
ON and PV CC – V F while M1 is OFF where V F is the ON
voltage of the 1N4148 diode. Ringing at the drain of M2
can cause transients above 2PV CC at PV CC1 ; if PV CC is
higher than 7V, a 12V zener diode should be included from
PV CC1 to PGND to prevent transients from damaging the
circuitry at PV CC2 or the gate of M1.
More complex charge pumps can be constructed with the
16-lead versions of the LTC1430 to provide additional
voltages for use with standard threshold MOSFETs or very
low PV CC voltages. A tripling charge pump (Figure 5) can
provide 2PV CC and 3PV CC voltages. These can be con-
V CC
PV CC2
PV CC1
PV CC
nected to PV CC2 and PV CC1 respectively, allowing stan-
dard threshold MOSFETs to be used with 5V at PV CC or 5V
INTERNAL
CIRCUITRY
G1
G2
M1
M2
L1
+
V OUT
C OUT
logic level threshold MOSFETs to be used with 3.3V at
PV CC . V CC can be driven from the same potential as PV CC2 ,
allowing the entire system to run from a single 3.3V
supply. Tripling charge pumps require the use of Schottky
diodes to minimize forward drop across the diodes at
LTC1430 (16-LEAD)
LTC1430 ? F06
start-up. The tripling charge pump circuit will tend to
rectify any ringing at the drain of M2 and can provide well
Figure 6. 16-Lead Power Supplies
The 8-lead versions of the LTC1430 have the PV CC2 and
V CC pins tied together inside the package (Figure 7). This
more than 3PV CC at PV CC1 ; all tripling (or higher multiply-
ing factor) circuits should include a 12V zener clamp diode
D Z to prevent overvoltage at PV CC1 .
pin, brought out as V CC /PV CC2 , has the same low ripple
V CC /PV CC2
PV CC1
PV CC
requirements as the 16-lead part, but must also be able to
supply the gate drive current to M2. This can be obtained
by using a larger RC filter from the PV CC pin; 22 ? and 10 μ F
work well here. The 10 μ F capacitor must be VERY close to
the part (preferably right underneath the unit) or output
regulation may suffer.
INTERNAL
CIRCUITRY
G1
G2
M1
M2
L1
+
V OUT
C OUT
10
LTC1430 (8-LEAD)
Figure 7. 8-Lead Power Supplies
LTC1430 ? F07
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| LTC1430IS | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1430IS#PBF | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1430IS#TR | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1430IS#TRPBF | 功能描述:IC SW REG CNTRLR STEP-DWN 16SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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