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参数资料
| 型号： | LTC3443EDE#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 12DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.4 V ~ 5.25 V |
| 输入电压： | 2.4 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 600kHz |
| 电流 - 输出： | 1.2A |
| 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： | 12-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 12-DFN（4x3） |
LTC3443
APPLICATIO S I FOR ATIO
above calculations in order to maintain the desired tran-
sient response.
The other component of ripple is due to the ESR (equiva-
lent series resistance) of the output capacitor. Low ESR
capacitors should be used to minimize output voltage
ripple. For surface mount applications, Taiyo Yuden ce-
ramic capacitors, AVX TPS series tantalum capacitors or
Sanyo POSCAP are recommended.
Input Capacitor Selection
Since the V IN pin is the supply voltage for the IC it is
recommended to place at least a 4.7 μ F, low ESR bypass
capacitor.
Output Voltage > 4.3V
A Schottky diode from SW to V OUT is required for output
voltages over 4.3V. The diode must be located as close to
the pins as possible in order to reduce the peak voltage on
SW2 due to the parasitic lead and trace inductance.
Input Voltage > 4.5V
For applications with input voltages above 4.5V which
could exhibit an overload or short-circuit condition, a
2 Ω /1nF series snubber is required between the SW1 pin
and GND. A Schottky diode from SW1 to V IN should also
be added as close to the pins as possible. For the higher
input voltages, V IN bypassing becomes more critical;
Table 2. Capacitor Vendor Information
SUPPLIER PHONE FAX
WEB SITE
therefore, a ceramic bypass capacitor as close to the V IN
and GND pins as possible is also required.
AVX
Sanyo
(803) 448-9411
(619) 661-6322
(803) 448-1943
(619) 661-1055
www.avxcorp.com
www.sanyovideo.com
Operating Frequency Selection
Taiyo Yuden (408) 573-4150
(408) 573-4159
www.t-yuden.com
Additional quiescent current due to the output switches
GATE charge is given by:
Optional Schottky Diodes
The Schottky diodes across the synchronous switches B
and D are not required (V OUT < 4.3V), but provide a lower
drop during the break-before-make time (typically 15ns)
of the NMOS to PMOS transition, improving efficiency.
Use a Schottky diode such as a Phillips PMEG2010EA or
equivalent. Do not use ordinary rectifier diodes, since the
slow recovery times will compromise efficiency. For appli-
cations with an output voltage above 4.3V, a Schottky
diode is required from SW2 to V OUT .
Output Voltage < 2.4V
Buck: 800e –12 ? V IN ? f
Boost: 400e –12 ? (V IN + V OUT ) ? f
Buck/Boost: f ? (1200e –12 ? V IN + 400e –12 ? V OUT )
where f = switching frequency
Closing the Feedback Loop
The LTC3443 incorporates voltage mode PWM control.
The control to output gain varies with operation region
(Buck, Boost, Buck/Boost), but is usually no greater than
15. The output filter exhibits a double pole response is
given by:
The LTC3443 can operate as a buck converter with output
voltages as low as 0.4V. The part is specified at 2.4V
minimum to allow operation without the requirement of a
f FILTER _ POLE =
1
2 ? π ? L ? C OUT
Hz
Schottky diode. Synchronous switch D is powered from
V OUT and the R DS(ON) will increase at low output voltages,
where C OUT is the output filter capacitor.
therefore a Schottky diode is required from SW2 to V OUT
to provide the conduction path to the output.
3443fa
12
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