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参数资料
| 型号： | LTC3527EUD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ DL 16QFN |
| 标准包装： | 121 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 1.6 V ~ 5.25 V |
| 输入电压： | 0.5 V ~ 5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.2MHz，2.2MHz |
| 电流 - 输出： | 400mA，800mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-QFN（3x3） |
LTC3527/LTC3527-1
OPERATION
V OUT 1 = 1 . 20 V ? ? 1 +
V OUT 2 = 1 . 20 V ? ? 1 +
? R 3 ?
R 4 ? ?
to FB1 for converter 1 and FB2 for converter 2. Clamps
limit the minimum and maximum error amp output volt-
ages for improved large-signal transient response. Power
converter control loop compensation is provided internally.
An external resistive voltage divider from V OUT1 (V OUT2 )
to ground programs the respective output voltage via FB1
(FB2) from 1.6V to 5.25V.
? R1 ?
?
? R 2 ?
( See Block Diagram )
?
Current Sensing: Lossless current sensing converts the
peak current signal of each N-channel MOSFET switch
into a voltage which is summed with its corresponding
internal slope compensation. The summed signals are
compared to their respective error ampli?er outputs to
provide individual peak current control commands for the
PWM of each converter.
Current Limit: The current limit comparators shut off
the N-channel MOSFET switches once their threshold
is reached. Each current limit comparator delay time to
output is typically 60ns. Peak switch current is limited
to approximately 900mA for converter 1 and 500mA for
converter 2, independent of input or output voltage. If
V OUT1 or V OUT2 falls below 1V, its respective current limit
is cut in half.
Zero Current Comparator: The zero current comparators
monitor the inductor current to the outputs and shut off
the synchronous recti?ers when the current reduces to ap-
proximately 30mA. This prevents the inductor current from
reversing in polarity, improving ef?ciency at light loads.
Synchronous Recti?er: To control inrush current and to
prevent the inductor currents from running away when
V OUT1 or V OUT2 is close to V IN , the P-channel MOSFET
synchronous recti?ers are only enabled when their respec-
tive V OUT > (V IN + 0.24V).
Anti-Ringing Control: The anti-ringing control connects a
resistor across the inductor to prevent high frequency ring-
ing on the SW1 (SW2) pins during discontinuous current
mode operation. Although the ringing of the resonant circuit
formed by the inductors and C SW (capacitance on SW1 or
SW2 pins) is low energy, it can cause EMI radiation.
Output Disconnect: The LTC3527/LTC3527-1 are designed
to allow true output disconnect by eliminating body diode
conduction of the internal P-channel MOSFET recti?ers.
This allows V OUT1 and V OUT2 to go to zero volts during
shutdown, drawing no current from the input source. It
also allows for inrush current limiting at turn-on, minimiz-
ing surge currents seen by the input supply. Note that to
obtain the advantages of output disconnect, there must
not be external Schottky diodes connected between the
SW1 (SW2) pins and V OUT1 (V OUT2 ). The output discon-
nect feature also allows V OUT1 or V OUT2 to be pulled high,
without any reverse current into a battery on V IN .
Thermal Shutdown: If the die temperature exceeds 160°C,
the device will go into thermal shutdown. All switches
will be turned off and the soft-start capacitors will be
discharged. The device will be enabled again when the
die temperature drops by about 15°C.
Burst Mode Operation
To realize the ef?ciency bene?ts of Burst Mode operation,
both V OUT1 and V OUT2 must be under a light load current
condition, if they are both enabled. If one converter is shut
down, then Burst Mode operation is enabled on the other
converter. With the MODE pin low, the LTC3527/LTC3527-1
will automatically enter Burst Mode operation at light load
and return to ?xed frequency PWM mode when the load
increases. Refer to the Typical Performance Characteristics
to see the Output Load Burst Mode Threshold Current vs
V IN . The load current at which Burst Mode operation is
entered can be changed by adjusting the inductor value.
Raising the inductor value will lower the load current at
which Burst Mode is operation entered.
In Burst Mode operation, the LTC3527/LTC3527-1 still
switch at a ?xed frequency of 1.2MHz (FSEL = 0) or 2.2MHz
(FSEL = 1), using the same error ampli?er and loop compen-
sation for peak current mode control. This control method
eliminates the output transient when switching between
modes. In Burst Mode operation, energy is delivered to the
35271fc
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相关代理商/技术参数 |
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|---|---|
| LTC3527EUD-1-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters |
| LTC3527EUD-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters |
| LTC3527EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters |
| LTC3527EUD-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters |
| LTC3527EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 800mA/400mA, 1.2MHz/2.2MHz Synchronous Step-Up DC/DC Converters |
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