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參數資料
| 型號： | LTC3100EUD#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數： | 13/26頁 |
| 文件大小： | 403K |
| 描述： | IC REG BUCK/BOOST/LINEAR 16-QFN |
| 產品培訓模塊： | More Information on LDOs |
| 標準包裝： | 2,500 |
| 拓撲： | 降壓（降壓）（1），升壓（升壓）（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數： | 3 |
| 頻率 - 開關： | 1.5MHz |
| 電壓/電流 - 輸出 1： | 0.6 V ~ 5.5 V，250mA |
| 電壓/電流 - 輸出 2： | 1.5 V ~ 5.25 V，700mA |
| 電壓/電流 - 輸出 3： | 0.6 V ~ 5.25 V，100mA |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 無 |
| 帶序列發生器： | 是 |
| 電源電壓： | 0.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-WFQFN 裸露焊盤 |
| 供應商設備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
LTC3100
13
3100fb
For more information www.linear.com/LTC3100
Current Sensing
Lossless current sensing converts the peak current signal
of the N-channel MOSFET switch into a voltage which
is summed with the internal slope compensation. The
summed signal is compared to the error amplifier output
to provide a peak current control command for the PWM.
Current Limit
The current limit comparator shuts off the N-channel
MOSFET switch once its threshold is reached. Peak switch
current is no less than 700mA, independent of input or
output voltage, unless V
OUT
falls below 1V, in which case
the current limit is cut in half to minimize power dissipation
into a short-circuit.
Slope Compensation
Current mode control requires the use of slope compen-
sation to prevent subharmonic oscillations in the inductor
current waveform at high duty cycle operation. This is ac-
complished internally on the LTC3100 through the addition
of a compensating ramp to the current sense signal. The
LTC3100 performs current limiting prior to addition of the
slope compensation ramp and therefore achieves a peak
inductor current limit that is independent of duty cycle.
Zero Current Comparator
The zero current comparator monitors the boost inductor
current to the output and shuts off the synchronous rectifier
once this current reduces to approximately 30mA. This
prevents the inductor current from reversing in polarity,
improving efficiency at light loads.
Synchronous Rectifier
To control inrush current and to prevent the inductor
current from running away when V
OUT
is close to V
IN
,
the P-channel MOSFET synchronous rectifier is only fully
enabled when V
OUT
> (V
IN
+ 0.24V).
Anti-Ringing Control
The anti-ring circuitry connects a resistor across the
boost inductor to prevent high frequency ringing on the
SW pin during discontinuous current mode operation.
The ringing of the resonant circuit formed by L and C
SW
(capacitance on SWBST pin) is low energy, but can cause
EMI radiation.
PGOOD Comparator
The PGBST pin is an open-drain output which indicates the
status of the boost converter output voltage. If the boost
output voltage falls 8% below the regulation voltage, the
PGBST open-drain output will pull low. The output voltage
must rise 3% above the falling threshold before the pull-
down will turn off. In addition, there is a 60祍 (typical)
deglitching delay in order to prevent false trips due to
voltage transients on load steps. The PGBST output will
also pull low if the boost converter is disabled. The typical
PGBST pull-down switch resistance is 13?when V
BST
or
V
INBST
equals 3.3V.
Output Disconnect
The LTC3100 boost converter is designed to allow true
output disconnect by eliminating body diode conduction
of the internal P-channel MOSFET rectifier. This allows for
V
OUT
to go to 0V during shutdown, drawing no current
from the input source. It also allows for inrush current
limiting at turn-on, minimizing surge currents seen by the
input supply. Note that to obtain the advantages of output
disconnect, there must not be an external Schottky diode
connected between SWBST and V
BST
. The output discon-
nect feature also allows V
OUT
to be pulled high without
any reverse current into the battery.
V
IN
> V
OUT
Operation
The LTC3100 boost converter will maintain voltage reg-
ulation even when the input voltage is above the desired
output voltage. Note that the output current capability is
slightly reduced in this mode of operation. Refer to the
Typical Performance Characteristics section.
Burst Mode Operation (for Boost and Buck Converters)
Burst Mode operation for both converters can be enabled
or disabled using the MODE pin. If MODE is grounded,
Burst Mode operation is disabled for both the boost and
OPERATION
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