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| 型号： | LTC1530CS8-3.3 |
| 厂商： | Linear Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC SW REG CNTRLR SYNC 3.3V 8SOIC |
| 标准包装： | 100 |
| 应用： | 控制器，Intel Pentium? II，AMD-K6?-2 |
| 输入电压： | 3.75 V ~ 13.2 V |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
LTC1530
TEST CIRCUITS
PV CC
12V
I FB
PV CC
LTC1530
G1
+
0.1 μ F
3300pF
10 μ F
G1 RISE/FALL
t r
90%
50%
10%
t NOL
90%
50%
10%
t NOL
t f
COMP
t SS
COMP
COMP
G2
G2 RISE/FALL
50%
50%
G1
V OUT
GND
3300pF
1530 F04b
1530 F04a
Figure 4
APPLICATIO S I FOR ATIO
OVERVIEW
The LTC1530 is a voltage feedback, synchronous switch-
ing regulator controller (see Block Diagram) designed for
use in high power, low voltage step-down (buck) convert-
ers. It includes an on-chip soft-start capacitor, a PWM
generator, a precision reference trimmed to ± 1%, two high
power MOSFET gate drivers and all the necessary feed-
back and control circuitry to form a complete switching
regulator circuit running at 300kHz.
The LTC1530 includes a current limit sensing circuit that
uses the topside external N-channel power MOSFET as a
current sensing element, eliminating the need for an
external sense resistor. If the current comparator, CC,
detects an overcurrent condition, the duty cycle is reduced
by discharging the internal soft-start capacitor through a
voltage-controlled current source. Under severe over-
loads or output short-circuit conditions, the soft-start
capacitor is pulled to ground and a start-up cycle is
initiated. If the short circuit or overload persists, the chip
repeats soft-start cycles and prevents damage to external
components.
THEORY OF OPERATION
Primary Feedback Loop
The LTC1530 compares the output voltage with the inter-
nal reference at the error amplifier inputs. The error
amplifier outputs an error signal to the PWM comparator.
This signal is compared to the fixed frequency oscillator
sawtooth waveform to generate the PWM signal. The
PWM signal drives the external MOSFETs at the G1 and G2
pins. The resulting chopped waveform is filtered by L O and
C OUT which closes the loop. Loop frequency compensa-
tion is typically accomplished with an external RC + C
network at the COMP pin, which is the output node of the
transconductance error amplifier.
MIN, MAX Feedback Loops
Two additional comparators in the feedback loop provide
high speed fault correction in situations where the error
amplifier cannot respond quickly enough. MIN compares
the feedback signal to a voltage 3% below the internal
reference. If the signal is below the comparator threshold,
the MIN comparator overrides the error amplifier and
forces the loop to maximum duty cycle, typically 86%.
Similarly, the MAX comparator forces the output to 0%
duty cycle if the feedback signal is greater than 3% above
the internal reference. To prevent these two comparators
from triggering due to noise, the MIN and MAX compara-
tors’ response times are deliberately delayed by two to
three microseconds. These comparators help prevent
extreme output perturbations with fast output load current
transients, while allowing the main feedback loop to be
optimally compensated for stability.
Thermal Shutdown
The LTC1530 has a thermal protection circuit that disables
both internal gate drivers if activated. G1 and G2 are held
low and the LTC1530 supply current drops to about 1mA.
1530fa
8
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| LTC1530IS8 | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8#PBF | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8#TR | 功能描述:IC SW REG CTRLR SYNC HIPWR 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8#TRPBF | 功能描述:IC SW REG CNTRLR SYNC ADJ 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC1530IS8-1.9 | 功能描述:IC SW REG CNTRLR SYNC 1.9V 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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