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参数资料
| 型号： | LT1683IG |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Ultralow Noise Push-Pull DC/DC Controller |
| 中文描述： | SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | 5.30 MM, PLASTIC, SSOP-20 |
| 文件页数： | 6/24页 |
| 文件大小： | 237K |
| 代理商： | LT1683IG |
6
LT1683
1683f
PIU
Part Supply
V5 (Pin 5):
This pin provides a 5V output that can sink or
source 10mA for use by external components. V5 source
current comes from V
IN
. Sink current goes to GND. V
IN
must be greater than 6.5V in order for this voltage to be in
regulation. If this pin is used, a small capacitor (<1
μ
F) may
be placed on this pin to reduce noise. This pin can be left
open if not used.
GND (Pin 11):
Signal Ground. The internal error amplifier,
negative feedback amplifier, oscillator, slew control cir-
cuitry, V5 regulator, current sense and the bandgap refer-
ence are referred to this ground. Keep the connection to
this pin, the feedback divider and V
C
compensation net-
work free of large ground currents.
SHDN (Pin 14):
The shutdown pin can disable the switcher.
Grounding this pin will disable all internal circuitry.
Increasing SHDN voltage will initially turn on the internal
bandgap regulator. This provides a precision threshold for
the turn on of the rest of the IC. As SHDN increases past
1.39V the internal LDO regulator turns on, enabling the
control and logic circuitry.
24
μ
A of current is sourced out of the pin above the turn on
threshold. This can be used to provide hysteresis for the
shutdown function. The hysteresis voltage will be set by
the Thevenin resistance of the resistor divider driving this
pin times the current sourced out. Above approximately
2.1V the hysteresis current is removed. There is approxi-
mately 0.1V of voltage hysteresis on this pin as well.
The pin can be tied high (to V
IN
for instance).
V
IN
(Pin 17):
Input Supply. All supply current for the part
comes from this pin including gate drives and V5 regula-
tor. Charge current for gate drives can produce current
pulses of hundreds of milliamperes. Bypass this pin with
a low ESR capacitor.
When V
IN
is below 2.55V the part will go into supply
undervoltage lockout where the gate drivers are driven
low. This, along with gate drive undervoltage lockout,
prevents unpredictable behavior during power up.
PGND (Pin 20):
Power Driver Ground. This ground comes
from the MOSFET gate drivers. This pin can have several
hundred milliamperes of current on it when the external
MOSFETs are being turned off.
Oscillator
SYNC (Pin 6):
The SYNC pin can be used to synchronize
the part to an external clock. The oscillator frequency
should be set close to the external clock frequency.
Synchronizing the clock to an external reference is useful
for creating more stable positioning of the switcher volt-
age and current harmonics. This pin can be left open or
tied to ground if not used.
C
T
(Pin 7):
The oscillator capacitor pin is used in conjunc-
tion with R
T
to set the oscillator frequency. For R
T
= 16.9k:
C
OSC
(nf) = 129/f
OSC
(kHz)
R
T
(Pin 8):
The oscillator resistor pin is used to set the
charge and discharge currents of the oscillator capacitor.
The nominal value is 16.9k. It is possible to adjust this
resistance
±
25% to set oscillator frequency more accu-
rately.
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| LT1683IG#PBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT1683IG#TR | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LT1683IG#TRPBF | 功能描述:IC REG CTRLR PWM CM 20-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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