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参数资料
| 型号： | LTC3827IG-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 580kHz |
| 占空比： | 99.4% |
| 电源电压： | 4 V ~ 36 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： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
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LTC3827-1
APPLICATIONS INFORMATION
controller design. Also, the input protection fuse resistance,
battery resistance, and PC board trace resistance losses
are also reduced due to the reduced peak currents in a
2-phase system. The overall bene?t of a multiphase design
will only be fully realized when the source impedance of the
power supply/battery is included in the ef?ciency testing.
The sources of the top MOSFETs should be placed within
1cm of each other and share a common C IN (s). Separating
the sources and C IN may produce undesirable voltage and
current resonances at V IN .
A small (0.1μF to 1μF) bypass capacitor between the chip
V IN pin and ground, placed close to the LTC3827-1, is
also suggested. A 10Ω resistor placed between C IN (C1)
and the V IN pin provides further isolation between the
two channels.
The selection of C OUT is driven by the effective series
resistance (ESR). Typically, once the ESR requirement
is satis?ed, the capacitance is adequate for ?ltering. The
SENSE + and SENSE – Pins
The common mode input range of the current comparator
is from 0V to 10V. Continuous linear operation is provided
throughout this range allowing output voltages from 0.8V
to 10V. The input stage of the current comparator requires
that current either be sourced or sunk from the SENSE pins
depending on the output voltage, as shown in the curve in
Figure 4. If the output voltage is below 1.5V, current will
?ow out of both SENSE pins to the main output. In these
cases, the output can be easily pre-loaded by the V OUT
resistor divider to compensate for the current comparator’s
negative input bias current. Since V FB is servoed to the
0.8V reference voltage, R A in Figure 3 should be chosen
to be less than 0.8V/I SENSE , with I SENSE determined from
Figure 4 at the speci?ed output voltage.
V OUT
output ripple ( Δ V OUT ) is approximated by:
1/2 LTC3827-1
R B
C FF
V OUT I RIPPLE ESR +
1
8fC OUT
V FB
R A
3827-1 F03
V OUT = 0.8V ? 1 + B
where f is the operating frequency, C OUT is the output
capacitance and I RIPPLE is the ripple current in the induc-
tor. The output ripple is highest at maximum input voltage
since I RIPPLE increases with input voltage.
Setting Output Voltage
The LTC3827-1 output voltages are each set by an exter-
nal feedback resistor divider carefully placed across the
output, as shown in Figure 3. The regulated output voltage
is determined by:
R
R A
200
100
0
–100
–200
–300
–400
–500
–600
–700
Figure 3. Setting Output Voltage
0
1 2 3 4 5
6 7 8 9
10
To improve the frequency response, a feed-forward ca-
V SENSE COMMON MODE VOLTAGE (V)
38271 F04
pacitor, C FF , may be used. Great care should be taken to
route the V FB line away from noise sources, such as the
Figure 4. SENSE Pins Input Bias Current
vs Common Mode Voltage
inductor or the SW line.
38271fe
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3827IUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC3827IUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC3828EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3828EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC3828EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Sync Step Down 4.5V to 28V Input 32-Pin QFN EP |
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