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参数资料
| 型号： | LTC3603EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2.5A 20QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 14.5 V |
| 输入电压： | 4.5 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 3MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
LTC3603
APPLICATIONS INFORMATION
t SS = C SS ?
In order to turn on the topside MOSFET, the voltage on
the BOOST pin is then applied to its gate. As the topside
MOSFET turns on, the SW pin rises to the PV IN voltage
and the BOOST pin rises to PV IN + INTV CC , thereby keep-
ing the MOSFET fully enhanced. For most applications, a
0.22μF ceramic capacitor is appropriate for C BST . Schottky
diode D BST should have a reverse breakdown voltage that
is greater than PV IN(MAX) .
INTV CC
LTC3603 D BST
BOOST C INTVCC
C BST
SW
3603 F03
Figure 3. Topside MOSFET Supply
A 1.2μA internal pull-up current will charge this capacitor,
resulting in a soft-start ramp time given by:
0.6V
1.2μA
When the LTC3603 detects a fault condition (either
undervoltage lockout or overtemperature), the TRACK/SS
pin is quickly pulled to ground and the internal soft-start
timer is also reset. This ensures an orderly restart when
using an external soft-start capacitor.
To implement tracking, a resistor divider is placed between
an external supply (V X ) and the TRACK/SS pin as shown
in Figure 5a. This technique can be used to cause V OUT to
ratiometrically track the V X supply (Figure 5b), according
to the following:
= TA ?
Run and Soft-Start/Tracking Functions
V OUT
V X
R R A + R B
R A R TA + R TB
The LTC3603 has a low power shutdown mode which is
controlled by the RUN pin. Pulling the RUN pin below 0.7V
puts the LTC3603 into a low quiescent current shutdown
mode (I Q < 1μA). When the RUN pin is greater than 0.7V,
the controller is enabled. The RUN pin can be driven directly
from logic as shown in Figure 4. Do not allow the RUN pin
to float during power cycling. In some cases, a pull-down
resistor of 50k or less may be needed to avoid this.
3.3V OR 5V PV IN
For coincident tracking, as shown in Figure 5c, (V OUT =
V X during start-up),
R TA = R A , R TB = R B
Note that the 1.2μA current that is sourced from the
TRACK/SS pin will cause a slight offset in the voltage seen
on the TRACK/SS pin and consequently on the V OUT volt-
age during tracking. This V OUT offset due to the TRACK/SS
current is given by:
R + R B
LTC3603
RUN
4.7M
LTC3603
RUN
V OS,TRK = (1μA) ?
R TA R TA
R TA + R TB
? A
R A
50k
Figure 4. RUN Pin Interfacing
3603 F04
For most applications, this offset is small and has minimal
effect on tracking performance. For improved tracking ac-
curacy, reduce the parallel impedance of R TA and R TB .
V X
Soft-start and tracking are implemented by limiting the
effective reference voltage as seen by the error amplifier.
Ramping up the effective reference into the error amp in
turn causes a smooth and controlled ramp on the output
voltage of the converter. To use the default, internal 1ms
soft-start ramp, leave the TRACK/SS pin floating. Do not
tie the TRACK/SS pin to INTV CC or to PV IN . To increase the
soft-start time above 1ms, place a cap on the TRACK/SS pin.
V OUT
R B
V FB
R TB LTC3603
R A
TRACK/SS
R TA 3603 F05a
Figure 5a. Using the TRACK/SS Pin to Track V X
13
For more information www.linear.com/LTC3603
3603fc
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