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參數(shù)資料
| 型號： | LTC3831IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 18/20頁 |
| 文件大小： | 208K |
| 代理商： | LTC3831IGN |
LTC3831
7
3831fb
PIN FUNCTIONS
BLOCK DIAGRAM
FREQSET (Pin 11): Frequency Set. Use this pin to adjust
the free-running frequency of the internal oscillator. With
the pin oating, the oscillator runs at about 200kHz. A
resistor from FREQSET to ground speeds up the oscillator;
a resistor to VCC slows it down.
IMAX (Pin 12): Current Limit Threshold Set. IMAX sets the
threshold for the internal current limit comparator. If IFB
drops below IMAX with TG on, the LTC3831 goes into cur-
rent limit. IMAX has an internal 12μA pull-down to GND.
Connect this pin to the main VIN supply at the drain of
Q1, through an external resistor to set the current limit
threshold. Connect a 0.1μF decoupling capacitor across
this resistor to lter switching noise.
IFB (Pin 13): Current Limit Sense. Connect this pin to the
switching node at the source of Q1 and the drain of Q2
through a 1k resistor. The 1k resistor is required to prevent
voltage transients from damaging IFB.This pin is used
for sensing the voltage drop across the upper N-channel
MOSFET, Q1.
VCC (Pin 14): Power Supply Input. All low power internal
circuits draw their supply from this pin. This pin requires
a 4.7μF bypass capacitor to GND.
PVCC2 (Pin 15): Power Supply Input for BG. Connect this
pin to the main high power supply.
BG (Pin 16): Bottom Driver Output . Connect this pin to
the gate of the lower N-channel MOSFET, Q2. This output
swings from PGND to PVCC2.ItremainslowwhenTGishigh
or during shutdown mode. To prevent output undershoot
during a soft-start cycle, BG is held low until TG rst goes
high (FFBG in the Block Diagram).
2.2V
QC
1.2V
–
+
–
+
–
+
R
S
PVCC1
TG
PVCC2
BG
PGND
R+
R–
FB
24k
750Ω
VREF + 3%
3830 BD
Q
–
+
PWM
QSS
VREF
VREF – 3%
VREF + 3%
MAX
MIN
ERR
12μA
INTERNAL
OSCILLATOR
100μs DELAY
SHDN
FREQSET
COMP
SS
POWER DOWN
DISABLE GATE DRIVE
LOGIC AND
THERMAL SHUTDOWN
+
–
CC
12μA
DISABLE
ILIM
IMAX
IFB
VREF
VREF – 3%
GND
VCC
R
S
ENABLE
BG
Q
POR
FFBG
–
+
PVCC1
VCC1 + 2.5V
V
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| LTC3831IGN#PBF | 功能描述:IC SW REG CONTROLLR SYNC 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
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