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参数资料
| 型号： | LTC3532EMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.5A 10MSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 300kHz ~ 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MSOP |
LTC3532
OPERATIO
V IN
7
V OUT
6
V IN
7
V OUT
6
A
3
SW1
+
dI ≈ V IN
dt L
L
–
4
SW2
D
250mA
A
3
SW1
–
dI ≈ – V OUT
dt L
+
L
4
SW2
D
250mA
B
C
0mA
T1
3532 F03
B
C
0mA
T2
3532 F04
5
GND
Figure 3. Inductor Charge Cycle During Burst Mode Operation
Note that the peak ef?ciency during Burst Mode operation
is less than the peak ef?ciency during ?xed frequency
because the part enters full-time 4-switch mode (when
servicing the output) with discontinuous inductor cur-
rent as illustrated in Figures 3 and 4. During Burst Mode
operation, the control loop is nonlinear and cannot utilize
5
GND
Figure 4. Inductor Disharge Cycle During Burst Mode Operation
where R BURST is in kΩ and I BURST is the load transition
current in Amps. For automatic operation, a ?lter capaci-
tor should also be connected from BURST to ground to
prevent ripple on BURST from causing the IC to oscillate
in and out of Burst Mode operation. The equation for the
minimum capacitor value is:
the control voltage from the error amp to determine the
control mode, therefore full-time 4-switch mode is required
to maintain the buck/boost function. The ef?ciency below
C BURST(MIN) ≥
C OUT ? V OUT
60,000V
1mA becomes dominated primarily by the quiescent cur-
rent. The Burst Mode operation ef?ciency is given by:
where C BURST(MIN) and C OUT are in μF. In the event that
a load transient causes the feedback pin to drop by more
EFFICIENCY ?
n ? I LOAD
35 μ A + I LOAD
than 4% from the regulation value while in Burst Mode
operation, the IC will immediately switch to ?xed frequency
mode and an internal pull-up will be momentarily applied
where n is typically 88% during Burst Mode operation.
Automatic Burst Mode Operation Control
Burst Mode operation can be automatic or manually con-
trolled with a single pin. In automatic mode, the IC will
enter Burst Mode operation at light load and return to ?xed
frequency operation at heavier loads. The load current at
which the mode transition occurs is programmed using
a single external resistor from the BURST pin to ground,
according to the following equations:
to BURST, rapidly charging the BURST capacitor. This
prevents the IC from immediately reentering Burst Mode
operation once the output achieves regulation.
Manual Burst Mode Operation
For manual control of Burst Mode operation, the RC net-
work connected to BURST can be eliminated. To force ?xed
frequency mode, BURST should be connected to V OUT . To
force Burst Mode operation, BURST should be grounded.
When commanding Burst Mode operation manually, the
Enter Burst Mode Operation: I =
Leave Burst Mode Operation: I =
10.5V
R BURST
7V
R BURST
circuit connected to BURST should be able to sink up to
2mA. For optimum transient response with large dynamic
loads, the operating mode should be controlled manually
by the host. By commanding ?xed frequency operation
prior to a sudden increase in load, output voltage droop can
3532fc
9
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| LTC3533 | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller |
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| LTC3533EDE#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 14DFN 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 |
| LTC3533EDE#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LTC3533EDE#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 14DFN 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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