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參數(shù)資料
| 型號： | LTC3537EUD#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 11/22頁 |
| 文件大小： | 314K |
| 描述： | IC REG DL BST/LINEAR SYNC 16-QFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 拓?fù)洌?/td> | 升壓（升壓）同步（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 2 |
| 頻率 - 開關(guān)： | 2.2MHz |
| 電壓/電流 - 輸出 1： | 1.5 V ~ 5.25 V，100mA |
| 電壓/電流 - 輸出 2： | 0.6 V ~ 5 V，100mA |
| 帶 LED 驅(qū)動器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 是 |
| 電源電壓： | 0.68 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(yīng)商設(shè)備封裝： | 16-QFN-EP（3x3） |
| 包裝： | 帶卷 (TR) |
LTC3537
11
3537fd
OPERATION
The LTC3537 is a 2.2MHz synchronous step-up (boost)
converter and LDO regulator housed in a 16-lead 3mm
?3mm QFN package. Included with the ability to start
up and operate from inputs less than 0.7V, the LTC3537
features xed frequency, current mode PWM control for
exceptional line and load regulation.
The current mode architecture with adaptive slope com-
pensation provides excellent transient load response,
requiring minimal output ltering. Internal soft-start and
loop compensation simpli es the design process while
minimizing the number of external components. With its low
R
DS(ON)
and low gate charge internal N-channel MOSFET
switch and P-channel MOSFET synchronous recti er, the
LTC3537 achieves high ef ciency over a wide range of
load currents. Automatic Burst Mode operation maintains
high ef ciency at very light loads, reducing the quiescent
current to just 30糀. Operation can be best understood
by referring to the Block Diagram.
LOW VOLTAGE START-UP
The LTC3537 step-up converter includes an independent
start-up oscillator designed to operate at an input voltage
of 0.68V (typical). Soft-start and inrush current limiting
are provided during start-up, as well as normal mode.
When either V
INB
or V
OUTB
exceeds 1.4V typical, the IC
enters normal operating mode. When the output voltage
exceeds the input by 0.24V, the IC powers itself from V
OUTB
instead of V
INB
. At this point the internal circuitry has no
dependency on the V
INB
input voltage, eliminating the
requirement for a large input capacitor. The input voltage
can drop as low as 0.5V after start-up is achieved. The
limiting factor for the application becomes the availability
of the power source to supply suf cient energy to the
output at low voltages, and maximum duty cycle, which
is clamped at 92% typical. Note that at low input voltages,
small voltage drops due to series resistance become
critical, and greatly limit the power delivery capability of
the converter.
LOW NOISE FIXED FREQUENCY OPERATION
Soft-Start
The LTC3537 contains internal circuitry to provide soft-
start operation. The soft-start circuitry slowly ramps the
peak inductor current from zero to its peak value of 750mA
(typical) in approximately 0.5ms, allowing start-up into
heavy loads. The soft-start circuitry is reset in the event
of a shutdown command or a thermal shutdown.
Oscillator
An internal oscillator sets the switching frequency to
2.2MHz.
Shutdown
Shutdown of the boost converter is accomplished by
pulling ENBST below 0.3V and enabled by pulling ENBST
above 0.8V. Note that ENBST can be driven above V
INB
or
V
OUTB
, as long as it is limited to less than the absolute
maximum rating.
Boost Error Ampli er
The non-inverting input of the transconductance error
ampli er is internally connected to the 1.2V reference
and the inverting input is connected to FBB. Clamps limit
the minimum and maximum error amp output voltage for
improved large-signal transient response. Power converter
control loop compensation is provided internally. An exter-
nal resistive voltage divider from V
OUTB
to ground programs
the output voltage via FBB from 1.5V to 5.25V.
V
OUTB
=1.21V 1+
R2
R1
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
Boost Current Sensing
Lossless current sensing converts the peak current signal of
the N-channel MOSFET switch into a voltage that is summed
with the internal slope compensation. The summed signal
is compared to the error ampli er output to provide a peak
current control command for the PWM.
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