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参数资料
| 型号： | LTC3713EG |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-SSOP |
| 标准包装： | 59 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 90% |
| 电源电压： | 1.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 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： | 24-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LTC3713
APPLICATIO S I FOR ATIO
be estimated from:
C SS > C OUT ? V OUT ? R SENSE (10 – 4 [F/V s])
Generally 0.1 μ F is more than sufficient.
converter. To ensure that the ripple current doesn’t exceed
a specified amount, the inductance can be chosen accord-
ing to the following equation:
V IN 2 ( MIN ) ? 1 – ?
Overcurrent latchoff operation is not always needed or
desired. Load current is already limited during a short-
circuit by the current foldback circuitry and latchoff
operation can prove annoying during troubleshooting.
L =
? V IN 2 ( MAX ) ?
? V OUT ( BOOST ) ?
? I ? f
The feature can be overridden by adding a pull-up current
greater than 5 μ A to the RUN/SS pin. The additional
current prevents the discharge of C SS during a fault and
also shortens the soft-start period. Using a resistor to V IN
as shown in Figure 6a is simple, but slightly increases
shutdown current. Connecting a resistor to INTV CC as
shown in Figure 6b eliminates the additional shutdown
current, but requires a diode to isolate C SS . Any pull-up
network must be able to pull RUN/SS above the 4.2V
maximum threshold of the latchoff circuit and overcome
the 4 μ A maximum discharge current.
INTV CC Supply
The 5V supply that powers the drivers and internal cir-
cuitry within the LTC3713 can be supplied by either an
internal P-channel low dropout regulator if V IN is greater
than 5V or the internal boost regulator if V IN is less than 5V.
The INTV CC pin can supply up to 50mA RMS and must be
bypassed to ground with a minimum of 4.7 μ F tantalum or
other low ESR capacitor. Good bypassing is necessary to
supply the high transient currents required by the MOSFET
gate drivers. Applications using large MOSFETs with a
high input voltage and high frequency of operation may
cause the LTC3713 to exceed its maximum junction tem-
perature rating or RMS current rating. In continuous mode
operation, this current is I GATECHG = f(Q g(TOP) + Q g(BOT) ).
The junction temperature can be estimated from the
equations given in Note 2 of the Electrical Characteristics.
Inductor Selection for Boost Converter
For the boost converter, the inductance should be 4.7 μ H
for input voltages less then 3.3V and 10 μ H for inputs
above 3.3V. The inductor should have a saturation current
rating of approximately 0.5A or greater. A guide for select-
ing an inductor for the boost converter is to choose a ripple
current that is 40% of the current supplied by the boost
Diode D3 Selection
A Schottky diode is recommended for use in the boost
converter section. The Motorola MBR0520 is a very good
choice.
Boost Converter Output Capacitor
Because the LTC3713’s boost converter is internally com-
pensated, loop stability must be carefully considered when
choosing its output capacitor. Small, low cost tantalum
capacitors have some ESR, which aids stability. However,
ceramic capacitors are becoming more popular, having
attractive characteristics such as near-zero ESR, small size
and reasonable cost. Simply replacing a tantalum output
capacitor with a ceramic unit will decrease the phase margin,
in some cases to unacceptable levels. With the addition of
a phase-lead capacitor and isolating resistor, the boost
converter portion of the LTC3713 can be used success-
fully with ceramic output capacitors.
Efficiency Considerations
The percent efficiency of a switching regulator is equal to
the output power divided by the input power times 100%.
It is often useful to analyze individual losses to determine
what is limiting the efficiency and which change would
produce the most improvement. Although all dissipative
elements in the circuit produce losses, four main sources
account for most of the losses in LTC3713 circuits:
1. DC I 2 R losses. These arise from the resistances of the
MOSFETs, inductor and PC board traces and cause the
efficiency to drop at high output currents. In continuous
mode the average output current flows through L, but is
chopped between the top and bottom MOSFETs. If the two
MOSFETs have approximately the same R DS(ON) , then the
resistance of one MOSFET can simply be summed with the
resistances of L and the board traces to obtain the DC I 2 R
3713fa
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3713EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-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) |
| LTC3713EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 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) |
| LTC3713EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-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) |
| LTC3714EG | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3714EG#PBF | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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