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| 型号： | LTC3569EFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 16TSSOP |
| 特色产品： | LTC3569 - Triple Buck Regulator With 1.2A and Two 600mA Outputs |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.43 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz，1MHz ~ 3MHz |
| 电流 - 输出： | 600mA，1.2A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3569
OPERATION
Introduction
The LTC3569 contains three constant-frequency, current
mode buck DC/DC regulators. Both the P-channel and
synchronous rectifier (N-channel) switches are internal
to each buck. The operating frequency is determined by
the value of the R T resistor, or is fixed to 2.25MHz by pull-
ing the R T pin to SV IN , or is synchronized to an external
oscillator tied to the MODE pin. Users may select pulse-
skipping or Burst Mode operation to trade off output ripple
for efficiency. Independent programmable reference levels
allow the LTC3569 to suit a variety of applications.
The LTC3569 offers different power levels, a single 1.2A
buck as well as two 600mA bucks. These three bucks
may be configured in different parallel configurations,
for versatile high current operation. The power stage of
buck 2 can be configured as a slave to buck 1, by pulling
FB2 to SV IN . The power stage of buck 3, can be configured
to be a slave to buck 2, by pulling the FB3 pin to SV IN . To
enable the slave power stage, pull the respective EN pin
high. However if the master is disabled, the slave power
stage is Hi-Z.
Each of the buck regulators supports 100% duty cycle
operation (low dropout mode) when their input voltage
drops very close to their output voltage. The switching
regulators also include soft-start to limit inrush current
when powering on, and short-circuit current protection.
Main Control Loop
During normal operation, the top power switch (P-chan-
nel MOSFET) is turned on at the beginning of a clock
cycle. The P-channel current ramps up as the inductor
charges. The peak inductor current is controlled by the
internally compensated error amplifier output, I TH . The
current comparator (PCOMP) turns off the P-channel and
turns on the N-channel synchronous rectifier when the
inductor current reaches the I TH level minus the offset of
the slope compensation ramp. The energy stored in the
inductor continues to flow through the bottom switch
(N-channel) and into the load until either the inductor
current approaches zero, or the next clock cycle begins.
If the inductor current approaches zero the N comparator
V REF
MODE
BURST
CLAMP
P COMP
SLOPE
I LIM
SOFT
START
ON
P VIN
V FB
S VIN
SLAVE
SD
EA EA
SLAVE
I TH
NOR
NAND
GATE
CLK
S Q
P-LATCH
R
SLAVE
I LIM
SWITCHING
LOGIC,
BLANKING,
ANTI SHOOT-THRU
P-CHANNEL
SW
N-CHANNEL
SLEEP
FROM MASTER
P ON
N OFF
P GND
V REF
PGOOD
N COMP
ON
SLAVE
NOR
–
+
3569 F02
Figure 2. Buck Block Diagram
3569fd
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3569EFE-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple Buck Regulator With 1.2A and Two 600mA Outputs and Individual Programmable References |
| LTC3569EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3569EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUDC#PBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3569EUDC#TRPBF | 功能描述:IC REG BUCK SYNC ADJ TRPL 20QFN RoHS:是 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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