参数资料
型号: LTC3830ES#PBF
厂商: Linear Technology
文件页数: 7/24页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 16-SOIC
标准包装: 50
PWM 型: 电压模式
输出数: 1
频率 - 最大: 250kHz
占空比: 95%
电源电压: 3 V ~ 8 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 管件
产品目录页面: 1336 (CN2011-ZH PDF)
LTC3830/LTC3830-1
PI FU CTIO S
FREQSET (Pin 11/NA/NA): Frequency Set. Use this pin to
adjust the free-running frequency of the internal oscillator.
With the pin floating, the oscillator runs at about 200kHz.
A resistor from FREQSET to ground speeds up the oscil-
lator; a resistor to V CC slows it down.
I MAX (Pin 12/NA/NA): Current Limit Threshold Set. I MAX
sets the threshold for the internal current limit compara-
tor. If I FB drops below I MAX with G1 on, the LTC3830 goes
into current limit. I MAX has an internal 12 μ A pull-down to
GND. Connect this pin to the main V IN supply at the drain
of Q1, through an external resistor to set the current limit
threshold. Connect a 0.1 μ F decoupling capacitor across
this resistor to filter switching noise.
I FB (Pin 13/NA/NA): 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 I FB .This pin is
used for sensing the voltage drop across the upper
N-channel MOSFET, Q1.
BLOCK DIAGRA
V CC (Pin 14/Pin 7/Pin 7): Power Supply Input. All low
power internal circuits draw their supply from this pin.
Connect this pin to a clean power supply, separate from
the main V IN supply at the drain of Q1. This pin requires a
4.7 μ F bypass capacitor. The LTC3830-1 and the 8-lead
LTC3830 have V CC and PV CC2 tied together at Pin 7 and
require a 10μF bypass capacitor to GND.
PV CC2 (Pin 15/Pin 7/Pin 7): Power Supply Input for G2.
Connect this pin to the main high power supply.
G2 (Pin 16/Pin 8/Pin 8): Bottom Gate Driver Output.
Connect this pin to the gate of the lower N-channel
MOSFET, Q2. This output swings from PGND to PV CC2 . It
remains low when G1 is high or during shutdown mode.
To prevent output undershoot during a soft-start cycle, G2
is held low until G1 first goes high. (FFBG in Block
Diagram.)
SHDN
100ms DELAY
INTERNAL
LOGIC AND
THERMAL SHUTDOWN
POWER DOWN
DISDR
OSCILLATOR
PV CC1
FREQSET
S
Q
G1
PWM
COMP
R
Q
PV CC2
SS
12 μ A
QSS
POR
FFBG
S Q
R
ENABLE
G2
G2
PGND
ERR
MIN
MAX
+
+
+
FB
V REF
CC
V REF – 3%
I FB
V REF + 3%
11.2k
18k
SENSE +
SENSE –
+
I MAX
V REF
2.2V
12 μ A
V REF – 3%
V REF + 3%
BG
3830 BD
QC
1.2V
DISABLE
ILIM
+
PV CC1
V
V CC1 + 2.5V
3830fa
7
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