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参数资料
| 型号： | LTC3836EUFD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 825kHz |
| 占空比： | 97% |
| 电源电压： | 2.75 V ~ 4.5 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 ~ 85°C |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3836
APPLICATIONS INFORMATION
t SS2 = t SS1 ? OUT2F
For coincident tracking,
V
V OUT1F
where V OUT1F and V OUT2F are the ?nal, regulated values
of V OUT1 and V OUT2 . V OUT1 should always be greater than
V OUT2 when using the TRACK/SS2 pin for tracking. If no
tracking function is desired, then the TRACK/SS2 pin may
be tied to a capacitor to ground, which sets the ramp time
to ?nal regulated output voltage.
Phase-Locked Loop and Frequency Synchronization
The LTC3836 has a phase-locked loop (PLL) comprised of
an internal voltage-controlled oscillator (VCO) and a phase
detector. This allows the turn-on of the main N-channel
MOSFET of controller 1 to be locked to the rising edge
of an external clock signal applied to the SYNC/FCB pin.
The turn-on of controller 2’s main N-channel MOSFET is
thus 180 degrees out-of-phase with the external clock.
The phase detector is an edge sensitive digital type that
provides zero degrees phase shift between the external
1400
1200
1000
800
and internal oscillators. This type of phase detector does
not exhibit false lock to harmonics of the external clock.
The output of the phase detector is a pair of complementary
current sources that charge or discharge the external ?lter
network connected to the PLLLPF pin. The relationship
between the voltage on the PLLLPF pin and operating
frequency, when there is a clock signal applied to SYNC/
FCB, is shown in Figure 8 and speci?ed in the Electrical
Characteristics table. Note that the LTC3836 can only be
synchronized to an external clock whose frequency is within
range of the LTC3836’s internal VCO, which is nominally
200kHz to 1MHz. This is guaranteed, over temperature
and variations, to be between 300kHz and 750kHz. A
simpli?ed block diagram is shown in Figure 9.
If the external clock frequency is greater than the internal
oscillator’s frequency, f OSC , then current is sourced con-
tinuously from the phase detector output, pulling up the
PLLLPF pin. When the external clock frequency is less
than f OSC , current is sunk continuously, pulling down
the PLLLPF pin. If the external and internal frequencies
2.4V
R LP
C LP
600
400
EXTERNAL
OSCILLATOR
SYNC/
FCB
DIGITAL
PHASE/
FREQUENCY
DETECTOR
PLLLPF
OSCILLATOR
200
0
0
0.5 1 1.5 2
PLLLPF PIN VOLTAGE (V)
2.4
3836 F08
3836 F09
Figure 8. Relationship Between Oscillator Frequency
Figure 9. Phase-Locked Loop Block Diagram
and Voltage at the PLLLPF Pin When Synchronizing to
an External Clock
3836fb
19
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| LTC3838EFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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) |
| LTC3838EFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38TSSOP 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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3838EUHF#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3838EUHF#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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