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参数资料
| 型号： | LTC3704IMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM CM 10-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 97% |
| 电源电压： | 2.5 V ~ 36 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
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LTC3704
APPLICATIO S I FOR ATIO
MODE/
SYNC
t MIN = 25ns
2V TO 7V
INTV CC Regulator Bypassing and Operation
An internal, P-channel low dropout voltage regulator pro-
duces the 5.2V supply which powers the gate driver and
0.8T
T
T = 1/f O
logic circuitry within the LTC3704, as shown in Figure 7.
The INTV CC regulator can supply up to 50mA and must be
GATE
D = 40%
bypassed to ground immediately adjacent to the IC pins
with a minimum of 4.7 μ F tantalum or ceramic capacitor.
Good bypassing is necessary to supply the high transient
currents required by the MOSFET gate driver.
I SW
3404 F05
1.230V
V IN
INPUT
SUPPLY
2.5V TO
30V
Figure 5. MODE/SYNC Clock Input and Switching
Waveforms for Synchronized Operation
P-CH
C IN
Programming the Operating Frequency
R1
5.2V INTV CC
The choice of operating frequency and inductor value is a
tradeoff between efficiency and component size. Low
frequency operation improves efficiency by reducing
R2
LOGIC
DRIVER
GATE
+
C VCC
4.7 μ F
M1
MOSFET and diode switching losses. However, lower
frequency operation requires more inductance for a given
amount of load current.
The LTC3704 uses a constant frequency architecture that
GND
PLACE AS CLOSE AS
POSSIBLE TO DEVICE PINS
GND
3704 F07
can be programmed over a 50kHz to 1000kHz range with
a single external resistor from the FREQ pin to ground, as
shown in Figure 1. The nominal voltage on the FREQ pin is
0.6V, and the current that flows into the FREQ pin is used
to charge and discharge an internal oscillator capacitor. A
graph for selecting the value of R T for a given operating
frequency is shown in Figure 6.
1000
100
Figure 7. Bypassing the LDO Regulator and Gate Driver Supply
For input voltages that don’t exceed 7V (the absolute
maximum rating for this pin), the internal low dropout
regulator in the LTC3704 is redundant and the INTV CC pin
can be shorted directly to the V IN pin. With the INTV CC pin
shorted to V IN , however, the divider that programs the
regulated INTV CC voltage will draw 10 μ A of current from
the input supply, even in shutdown mode. For applications
that require the lowest shutdown mode input supply
current, do not connect the INTV CC pin to V IN . Regardless
of whether the INTV CC pin is shorted to V IN or not, it is
always necessary to have the driver circuitry bypassed
with a 4.7 μ F tantalum or low ESR ceramic capacitor to
ground immediately adjacent to the INTV CC and GND
pins.
10
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (kHz)
3704 F06
In an actual application, most of the IC supply current is
used to drive the gate capacitance of the power MOSFET.
As a result, high input voltage applications in which a large
10
Figure 6. Timing Resistor (R T ) Value
power MOSFET is being driven at high frequencies can
3704fb
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