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参数资料
| 型号： | LTC3422EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 1.5A 10DFN |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.25 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 4.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 100kHz ~ 3MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3422
APPLICATIO S I FOR ATIO
conduct heat away from the LTC3422 and into the copper
plane with as much area as possible. In the event that the
junction temperature gets too high, the peak current limit
will automatically be decreased. If the junction tempera-
ture continues to rise, the LTC3422 will go into thermal
capacitor exhibited in voltage mode controllers, thus
simplifying it to a single pole filter response. The product
of ‘the modulator control to output DC gain’ and ‘the error
amp open-loop gain’ gives the DC gain of the system:
shutdown and all switching will stop until the internal
temperature drops.
G DC = G CONTROL _ OUTPUT ? G EA ?
V REF
V OUT
V IN > V OUT Operation
The LTC3422 will maintain voltage regulation when the
G CONTROL _ OUTPUT =
2 ? V IN
I OUT
; G EA ≈ 2000
? FILTER _ POLE =
inputvoltageisabovetheoutputvoltage.Thisisachieved
by terminating the switching of the synchronous P-chan-
nel MOSFET and applying V IN statically on the gate. This
will ensure the volt ? seconds of the inductor will reverse
during the time current is flowing to the output. Since this
mode will dissipate more power in the LTC3422, the
maximum output current is limited in order to maintain an
acceptable junction temperature and is given by:
The output filter pole is given by:
I OUT
π ? V OUT ? C OUT
where C OUT is the output filter capacitor.
The output filter zero is given by:
? FILTER _ ZERO =
I OUT ( MAX ) =
125 – T A
43 ? ( ( V IN + 1 . 5 ) – V OUT )
1
2 ? π ? R ESR ? C OUT
where R ESR is the capacitor equivalent series resistance.
where T A = ambient temperature.
For example at V IN = 4.5V, V OUT = 3.3V and T A = 85 ° C, the
A troublesome feature of the boost regulator topology is
the right-half plane zero (RHP), given by:
maximum output current is 345mA.
Short Circuit
The LTC3422 output disconnect feature allows output
? RHPZ =
V IN 2
2 ? π ? I OUT ? L ? V OUT
short circuit while maintaining a maximum internally set
current limit. However, the LTC3422 also incorporates
internal features such as current limit foldback and ther-
mal shutdown for protection from an excessive overload
or short circuit. During a prolonged short circuit the
current limit folds back to 0.75A typical should V OUT drop
below approximately 666mV. This 0.75A current limit
At heavy loads this gain increase with phase lag can occur
at a relatively low frequency. The loop gain is typically
rolled off before the RHP zero frequency.
The typical error amplifier compensation is shown in
Figure 3. The equations for the loop dynamics are as
follows:
remains in effect until V OUT exceeds approximately 800mV,
at which time the steady-state current limit is restored.
Closing the Feedback Loop
The LTC3422 utilizes current mode control with internal
adaptive slope compensation. Current mode control elimi-
nates the 2nd order filter due to the inductor and output
? POLE 1 ≈
? ZERO 1 ≈
? POLE 2 ≈
1
2 ? π ? 20 e 6 ? C C 1
1
2 ? π ? R Z ? C C 1
1
2 ? π ? R Z ? C C 2
which is extremely close to DC
3422fa
13
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| LTC3423EMS | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3423EMS#PBF | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3423EMS#TR | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP 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 |
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