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参数资料
| 型号： | LTC1436ACGN-PLL#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 23/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 138kHz |
| 占空比： | 99% |
| 电源电压： | 3.5 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LTC1436A
LTC1436A-PLL/LTC1437A
APPLICATIO N S I N FOR M ATIO N
[ ]
( ) 3 1 + ( ) ( ) ( )
P MAIN =
0 . 005 50 ° C ? 25 ° C
0 . 042 ?
+ 2 . 5 ( 22 V ) ( 3 A )( 100 pF )( 250 kHz ) = 88 mW
( )
P SYNC SC ( AVG ) ? 1 + δ R DS ( ON )
= ? I
The power dissipation on the topside MOSFET can be
easily estimated. Choosing a Siliconix Si4412DY results
in: R DS(ON) = 0.042 ? , C RSS = 100pF. At maximum input
voltage with T (estimated) = 50 ° C:
1 .6V 2
22 V
1 . 85
The most stringent requirement for the synchronous
N-channel MOSFET occurs when V OUT = 0 (i.e. short
circuit). In this case the worst-case dissipation rises to:
2
?? ??
With the 0.033 ? sense resistor I SC(AVG) = 4A will result,
increasing the Si4412DY dissipation to 950mW at a die
temperature of 105 ° C.
C IN is chosen for an RMS current rating of at least 1.5A at
temperature. C OUT is chosen with an ESR of 0.03 ? for low
output ripple. The output ripple in continuous mode will be
highest at the maximum input voltage. The output voltage
ripple due to ESR is approximately:
V ORIPPLE = R ESR ( ? I L ) = 0 . 03 ? ( 1 . 3 A ) = 39 mV P- P
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1436A/LTC1437A. These items are also illustrated
graphically in the layout diagram of Figure 15. Check the
following in your layout:
1. Are the signal and power grounds segregated? The
LTC1436A/LTC1437A signal ground pin must return to
source of the bottom N-channel MOSFET, anode of the
Schottky diode, and (–) plate of C IN , which should have
as short lead lengths as possible.
2. Does the LTC1436A/LTC1437A V OSENSE pin connect to
the (+) plate of C OUT ? In adjustable applications, the
resistive divider R1/R2 must be connected between the
(+) plate of C OUT and signal ground. The 100pF capaci-
tor should be as close as possible to the LTC1436A/
LTC1437A.
3. Are the SENSE – and SENSE + leads routed together with
minimum PC trace spacing? The filter capacitor be-
tween SENSE + and SENSE – should be as close as
possible to the LTC1436A/LTC1437A.
4. Does the (+) plate of C IN connect to the drain of the
topside MOSFET(s) as closely as possible? This capaci-
tor provides the AC current to the MOSFET(s).
5. Is the INTV CC decoupling capacitor connected closely
between INTV CC and the power ground pin? This ca-
pacitor carries the MOSFET driver peak currents.
6. Keep the switching node SW away from sensitive small-
signal nodes. Ideally, the switch node should be placed
at the furthest point from the LTC1436A/LTC1437A.
7. Route the PLLIN line away from Boost and SW pins to
avoid unwanted pickup (Boost and SW pins have high
dV/dTs).
8. SGND should be used exclusively for grounding exter-
nal components on PLL LPF, C OSC , I TH , LBI, SFB,
V OSENSE and AUXFB pins.
9. If operating close to the minimum on-time limit, is the
sense resistor oriented on the radial axis of the induc-
tor? See Figure 13.
the (–) plate of C OUT . The power ground connects to the
14367afb
23
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1436AEGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1436AEGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1436AIGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1436AIGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1436AIGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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