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| 型号： | LTC1142CG |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 47 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 250kHz |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 18 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： | 管件 |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LTC1142/LTC1142L/LTC1142HV
PI FU CTIO S
NC (Pins 7, 8): No Connection.
PDRIVE 5 (Pin 9): High Current Drive for Top P-Channel
MOSFET, 5V Section. Voltage swing at this pin is from V IN5
to ground.
V IN5 (Pin 10): Supply pin, 5V section, must be closely
decoupled to 5V power ground Pin 18.
C T5 (Pin 11): External capacitor C T5 from Pin 11 to ground
sets the operating frequency for the 5V section. (The actual
frequency is also dependent upon the input voltage.)
INTV CC5 (Pin 12) : Internal supply voltage for the 5V
section, nominally 3.3V, can be decoupled to signal ground,
Pin 17. Do not externally load this pin.
I TH5 (Pin 13): Gain Amplifier Decoupling Point, 5V Sec-
tion. The 5V section current comparator threshold in-
creases with the Pin 13 voltage.
SENSE – 5 (Pin 14): Connects to internal resistive divider
which sets the output voltage for the 5V section. Pin 14 is
also the (–) input for the current comparator on the
5V section.
SENSE + 5 (Pin 15): The (+) Input to the 5V Section Current
Comparator. A built-in offset between Pins 15 and 14 in
conjunction with R SENSE5 sets the current trip threshold
for the 5V section.
SHDN5 (Pin 16): When grounded, the 5V section operates
normally. Pulling Pin 16 high holds both MOSFETs off and
puts the 5V section in micropower shutdown mode.
Requires CMOS logic signal with t r , t f < 1 μ s. Do not “float”
Pin 16.
SGND5 (Pin 17): The 5V section small-signal ground must
be routed separately from other grounds to the (–) termi-
nal of the 5V section output capacitor.
PGND5 (Pin 18): The 5V section driver power ground
connects to source of N-channel MOSFET and the (–)
terminal of the 5V section input capacitor.
NC (Pin 19): No Connection.
NDRIVE 5 (Pin 20): High Current Drive for Bottom
N-Channel MOSFET, 5V Section. Voltage swing at Pin 20
is from ground to V IN5 .
6
NC (Pins 21, 22): No Connection.
PDRIVE 3 (Pin 23): High Current Drive for Top P-Channel
MOSFET, 3.3V Section. Voltage swing at this pin is from
V IN3 to ground.
V IN3 (Pin 24): Supply pin, 3.3V section, must be closely
decoupled to 3.3V power ground, Pin 4.
C T3 (Pin 25): External capacitor C T3 from Pin 25 to ground
sets the operating frequency for the 3.3V section. (The
actual frequency is also dependent upon the input voltage.)
INTV CC3 (Pin 26): Internal supply voltage for the 3.3V
section, nominally 3.3V, can be decoupled to signal ground,
Pin 3. Do not externally load this pin.
I TH3 (Pin 27): Gain Amplifier Decoupling Point, 3.3V
Section. The 3.3V section current comparator threshold
increases with the Pin 27 voltage.
SENSE – 3 (Pin 28): Connects to internal resistive divider
which sets the output voltage for the 3.3V section. Pin 28
is also the (–) input for the current comparator on the
3.3V section.
LTC1142HV-ADJ/LTC1142L-ADJ
SENSE + 1 (Pin 1): The (+) Input to the Section 1 Current
Comparator. A built-in offset between Pins 1 and 28 in
conjunction with R SENSE1 sets the current trip threshold
for this section.
V FB1 (Pin 2): This pin serves as the feedback pin from an
external resistive divider used to set the output voltage for
section 1.
SHDN1 (Pin 3): When grounded, the section 1 regulator
operates normally. Pulling Pin 3 high holds both MOSFETs
off and puts this section in micropower shutdown mode.
Requires CMOS logic signal with t r , t f < 1 μ s. Do not “float”
Pin 3.
SGND1 (Pin 4): The section 1 small-signal ground must
be routed separately from other grounds to the (–) termi-
nal of the section 1 output capacitor.
PGND1 (Pin 5): The section 1 driver power ground con-
nects to source of N-channel MOSFET and the (–) terminal
of the section 1 input capacitor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1142CG#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:- 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) |
| LTC1142CG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-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 |
| LTC1142CG#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:- 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) |
| LTC1142HV | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1142HV-ADJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
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