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| 型号： | LTC3602EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20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 ~ 9.5 V |
| 输入电压： | 4.5 V ~ 10 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 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） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3602
APPLICATIONS INFORMATION
Topside MOSFET Driver Supply (BOOST Pin)
The LTC3602 uses a bootstrapped supply to power the
gate of the internal topside MOSFET (Figure 3). When the
topside MOSFET is off and the SW pin is low, diode D BST
charges capacitor C BST to the voltage on the INTV CC sup-
ply. In order to turn on the topside MOSFET, the voltage on
voltage of the converter. To use the default, internal 1ms
soft-start ramp, leave the TRACK/SS pin ?oating. 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. A 1.2μA internal pull-up current will charge this cap,
resulting in a soft-start ramp time given by:
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-
t SS = C SS ?
0.6
1.2μA
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
When the LTC3602 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
LTC3602
BOOST
D BST
C INTVCC
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
SW
C BST
ratiometrically track the V X supply (Figure 5b), according
to the following:
= TA ?
3602 F03
Figure 3. Topside MOSFET Supply
V OUT
V X
R
R A
R A + R B
R TA + R TB
Run and Soft-Start/Tracking Functions
The LTC3602 has a low power shutdown mode which is
controlled by the RUN pin. Pulling the RUN pin below 0.7V
puts the LTC3602 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.
Soft-start and tracking are implemented by limiting the
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
effective reference voltage as seen by the error ampli?er.
Ramping up the effective reference into the error amp in
turn causes a smooth and controlled ramp on the output
V OS,TRK = (1.2μA) ?
R TA R TA
R TA + R TB
? A
R A
3.3V OR 5V
PV IN
For most applications, this offset is small and has minimal
effect on tracking performance. For improved tracking ac-
LTC3602
RUN
4.7MΩ
LTC3602
RUN
curacy, reduce the parallel impedance of R TA and R TB .
3602 F04
Figure 4. RUN Pin Interfacing
3602fb
12
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