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参数资料
| 型号： | LTC3569IUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ TRPL 20QFN |
| 标准包装： | 91 |
| 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： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN 裸露焊盘（3x3） |
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 |
|---|---|
| LTC3569IUD-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 |
| LTC3576 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Switching Power Manager with USB On-the-Go + Triple Step-Down DC/DCs |
| LTC3576-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Overvoltage/Overcurrent Protection Controller |
| LTC3576EUFE#PBF | 功能描述:IC POWER MANAGER W/USB OTG 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
| LTC3576EUFE#TRPBF | 功能描述:IC POWER MANAGER W/USB OTG 38QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 标准包装:1 系列:- 应用:手持/移动设备 电流 - 电源:- 电源电压:3 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-WFDFN 裸露焊盘 供应商设备封装:14-LLP-EP（4x4） 包装:Digi-Reel® 配用:LP3905SD-30EV-ND - BOARD EVALUATION LP3905SD-30 其它名称:LP3905SD-30DKR |
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