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参数资料
| 型号： | LTC3703EGN-5#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 96% |
| 电源电压： | 4.1 V ~ 15 V |
| 降压： | 是 |
| 升压： | 是 |
| 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 ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LTC3703-5
PI FU CTIO S
(GN16/G28)
MODE/SYNC (Pin 1/Pin 6): Pulse Skip Mode Enable/Sync
Pin. This multifunction pin provides Pulse Skip Mode en-
able/disable control and an external clock input for synchro-
nization of the internal oscillator. Pulling this pin below 0.8V
or to an external logic-level synchronization signal disables
Pulse Skip Mode operation and forces continuous opera-
tion. Pulling the pin above 0.8V enables Pulse Skip Mode
operation. This pin can also be connected to a feedback
resistor divider from a secondary winding on the inductor
to regulate a second output voltage.
f SET (Pin 2/Pin 7): Frequency Set. A resistor connected to
this pin sets the free running frequency of the internal os-
cillator. See applications section for resistor value selec-
tion details.
COMP (Pin 3/Pin 8): Loop Compensation. This pin is con-
nected directly to the output of the internal error amplifier.
An RC network is used at the COMP pin to compensate the
feedback loop for optimal transient response.
FB (Pin 4/Pin 9): Feedback Input. Connect FB through a
resistor divider network to V OUT to set the output voltage.
Also connect the loop compensation network from COMP
to FB.
I MAX (Pin 5/Pin 10): Current Limit Set. The I MAX pin sets
the current limit comparator threshold. If the voltage drop
across the bottom MOSFET exceeds the magnitude of the
voltage at I MAX , the controller goes into current limit. The
I MAX pin has an internal 12 μ A current source, allowing the
current threshold to be set with a single external resistor
to ground. See the Current Limit Programming section for
more information on choosing R IMAX .
INV (Pin 6/Pin 11): Top/Bottom Gate Invert. Pulling this pin
above 2V sets the controller to operate in step-up (boost)
mode with the TG output driving the synchronous MOSFET
and the BG output driving the main switch. Below 1V, the
controller will operate in step-down (buck) mode.
RUN/SS (Pin 7/Pin 13): Run/Soft-Start. Pulling RUN/SS be-
low 0.9V will shut down the LTC3703-5, turn off both of the
external MOSFET switches and reduce the quiescent sup-
ply current to 25 μ A. A capacitor from RUN/SS to ground
will control the turn-on time and rate of rise of the output
voltage at power-up. An internal 4 μ A current source pull-
up at the RUN/SS pin sets the turn-on time at approximately
750ms/ μ F.
GND (Pin 8/Pin 14): Ground Pin.
BGRTN (Pin 9/Pin 15): Bottom Gate Return. This pin con-
nects to the source of the pull-down MOSFET in the BG
driver and is normally connected to ground. Connecting a
negative supply to this pin allows the synchronous
MOSFET’s gate to be pulled below ground to help prevent
false turn-on during high dV/dt transitions on the SW node.
See the Applications Information section for more details.
BG (Pin 10/Pin 19): Bottom Gate Drive. The BG pin drives
the gate of the bottom N-channel synchronous switch
MOSFET. This pin swings from BGRTN to DRV CC .
DRV CC (Pin 11/Pin 20): Driver Power Supply Pin. DRV CC
provides power to the BG output driver. This pin should be
connected to a voltage high enough to fully turn on the
external MOSFETs, normally 4.5V to 15V for logic level
threshold MOSFETs. DRV CC should be bypassed to BGRTN
with a 10 μ F, low ESR (X5R or better) ceramic capacitor.
V CC (Pin 12/Pin 21) : Main Supply Pin. All internal circuits
except the output drivers are powered from this pin. V CC
should be connected to a low noise power supply voltage
between 4.5V and 15V and should be bypassed to GND
(Pin 8) with at least a 0.1 μ F capacitor in close proximity to
the LTC3703-5.
SW (Pin 13/Pin 26): Switch Node Connection to Inductor
and Bootstrap Capacitor. Voltage swing at this pin is from
a Schottky diode (external) voltage drop below ground to
V IN .
TG (Pin 14/Pin 27): Top Gate Drive. The TG pin drives the
gate of the top N-channel synchronous switch MOSFET. The
TG driver draws power from the BOOST pin and returns to
the SW pin, providing true floating drive to the top MOSFET.
BOOST (Pin 15/Pin 28): Top Gate Driver Supply. The BOOST
pin supplies power to the floating TG driver. The BOOST pin
should be bypassed to SW with a low ESR (X5R or better)
0.1 μ F ceramic capacitor. An additional fast recovery Schot-
tky diode from DRV CC to BOOST will create a complete float-
ing charge-pumped supply at BOOST.
V IN (Pin 16/Pin 1): Input Voltage Sense Pin. This pin is con-
nected to the high voltage input of the regulator and is used
by the internal feedforward compensation circuitry to im-
prove line regulation. This is not a supply pin .
37035fa
7
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| LTC3703HGN#PBF | 功能描述:IC REG CTRLR BST PWM VM 16-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3703HGN#TRPBF | 功能描述:IC REG CTRLR BST PWM VM 16-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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