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参数资料
| 型号： | LTC3531EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 8DFN |
| 标准包装： | 121 |
| 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 V ~ 5 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 电流 - 输出： | 200mA |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3531/
LTC3531-3.3/LTC3531-3
OPERATIO
Buck Mode
If V IN is ~800mV above V OUT , the LTC3531 operates in
buck or step-down mode. The higher offset between V IN
and V OUT (800mV) is required to ensure suf?cient mag-
netizing voltage across the inductor when the R DSONS
are taken into account. At the beginning of a buck mode
cycle (Figure 1 right side) switches A and D are turned
on (V IN – V OUT is applied across the inductor), current
is delivered to the output and ramped up until I PEAK is
detected. When this occurs, A is turned off, B is turned
on and inductor current falls (–V OUT across the induc-
tor) until an I VALLEY is detected. This AD then BD switch
sequence is repeated until the output is pumped above
its regulation voltage, a ?nal I ZERO is detected, and the
part returns to sleep mode.
Start-Up Mode
Before V OUT reaches approximately 1.6V, the D switch is
disabled and its body diode is used to transfer current to
the output capacitor. In start-up mode, the I VALLEY /I ZERO
sense circuit is disabled and an alternate algorithm is used
to control inductor current. When the LTC3531 is brought
out of shutdown (assuming V OUT is discharged) switches
A and C are turned on until the inductor current reaches
I PEAK . The AC switches are then turned off and inductor
current ?ows to the output through the B switch and D
body diode. The period for the B switch/D body diode is
controlled by the t OFF timer to ~800nS. This sequence of
AC switch-on to I PEAK then B switch and D body diode for
~800ns is repeated until V OUT reaches ~1.6V. Once this
threshold is reached, the LTC3531 will transfer through the
required modes until V OUT is brought into regulation.
Due to propagation delays in the sense circuitry, the
magnitudes of the I PEAK , I VALLEY , and I ZERO currents may
shift depending on V IN , V OUT and operating mode.
OTHER LTC3531 FEATURES
Shutdown: The part is shut down by pulling SHDN below
0.4V, and made active by pulling the pin up to V IN or V OUT .
Note that SHDN an be driven above V IN or V OUT , as long
as it is limited to less than 6V.
Output Disconnect and Inrush Limiting: The LTC3531
is designed to allow true output disconnect by opening
both P-channel MOSFET recti?ers. This allows V OUT to go
to zero volts during shutdown, drawing no current from
the input source. It also provides inrush current limiting
at turn-on, minimizing surge currents seen by the input
supply.
Thermal Shutdown: If the die temperature reaches ap-
proximately 150°C, the part will go into thermal shut-
down and all switches will be turned off. The part will be
enabled again when the die temperature has dropped by
10°C (nominal). To deliver the power that the LTC3531
is capable of, it is imperative that a good thermal path be
provided to dissipate the heat generated within the pack-
age. It is recommended that multiple vias in the printed
circuit board be used to conduct heat away from the IC
and into a copper plane with as much area as possible.
Soldering the Exposed Pad to the GND plane (DFN version)
is recommended to improve thermal performance.
3531fb
10
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