目录
1.产品概述 2.产品特点
3.应用范围 4.下载产品资料PDF文档
5.产品封装图 6.电路原理图
7.功能概述 8.相关产品
一,产品概述(General Description)
The CXSU63138 is a fixed switching frequency (1.5MHz typical), current-mode,
step-up regulator with an inte-grated N-channel MOSFET. The device allows the usage
of small inductors and output capacitors for portable devices. The current-mode control
scheme provides fast transient response and good output voltage accuracy. The CXSU63138 includes under-voltage lockout, current-limit, and over-temperature shutdown preventing
dam-age in the event of an output overload
二.产品特点(Features)
1.)Wide 2.7V to 6V Input Voltage Range
2.)Built-in 0.2Ω N-Channel MOSFET
3.)Built-in Soft-Start
4.)High Efficiency up to 90%
5.)<1μA Quiescent Current During Shutdown
6.)Current-Mode Operation
Stable with Ceramic Output Capacitors
Fast Transient Response
7.)Current-Limit Protection
8.)Over-Temperature Protection with Hysteresis
9.)Available in a TSOT-23-5A and TDFN2x2-6 Pack-age
10.)Lead Free and Green Devices Available(RoHS Compliant)
三,应用范围 (Applications)
Cell Phone and Smart Phone
PDA, PMP, MP3
Digital Camera
Boost Regulators
四.下载产品资料PDF文档
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五,产品封装图 (Package)
六.电路原理图
七,功能概述
Main Control Loop
The CXSU63138 is a constant frequency and current-mode switching regulator. In normal operation, the internal
N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch,
and then turned off when an internal comparator (ICMP) resets the latch. The peak inductor
current at which ICMP resets the RS latch is controlled by the voltage on the COMP node which
is the output of the error amplifier (EAMP). An external resis-tive divider connected between
VOUT and ground allows the EAMP to receive an output feedback voltage VFB at FB pin. When
the load current increases, it causes a slightly to decrease in VFB associated with the 1.23V
reference,which in turn, it causes the COMP voltage to increase until the average inductor
current matches the new load current.
VIN Under-Voltage Lockout (UVLO)
The Under-Voltage Lockout (UVLO) circuit compares the input voltage at VIN with the UVLO
threshold to ensure the input voltage is high enough for reliable operation.The 100mV (typ)
hysteresis prevents supply transients from causing a restart. Once the input voltage exceeds
the UVLO rising threshold, startup begins. When the in-put voltage falls below the UVLO falling
threshold, the controller turns off the converter.
Soft-Start
The CXSU63138 has a built-in soft-start to control the output voltage rise during start-up. During soft-start, an
internal ramp voltage, connected to the one of the positive inputs of the error amplifier, raises up to replace the
reference voltage (1.23V typical) until the ramp voltage reaches the reference voltage.
Current-Limit Protection
The CXSU63138 monitors the inductor current, flows through the N-channel MOSFET, and limits
the current peak at current-limit level to prevent loads and the CXSU63138 from damaging during overload or
short-circuit conditions.
Over-Temperature Protection (OTP)
The over-temperature circuit limits the junction tempera-ture of the CXSU63138. When the
junction temperature ex-ceeds 150 oC, a thermal sensor turns off the power MOSFET allowing
the devices to cool. The thermal sen-sor allows the converters to start a soft-start process and
regulates the output voltage again after the junction tem-perature cools by 40oC. The OTP is designed
with a 40oC hysteresis to lower the average Junction Temperature (TJ) during continuous thermal overload
conditions in-creasing the lifetime of the device.
Enable/Shutdown
Driving EN to the ground places the CXSU63138 in shut-down mode. When in shutdown, the internal power
MOSFET turns off, all internal circuitry shuts down, and the quiescent supply current reduces to 1μA maximum.
八,相关产品 更多同类产品......
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Switching Regulator > Boost Converter |
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|
Part_No |
Package |
Archi-tecture |
Input Voltage |
Max Adj. Output Voltage |
Switch Current Limit (max) |
Fixed Output Voltage |
Switching Frequency |
Internal Power Switch |
Sync. Rectifier |
||
|
min |
max |
min |
max |
(A) |
(V) |
(kHz) |
|||||
|
SOT89 |
VM |
0.9 |
5.5 |
2.5 |
5.5 |
0.5 |
1.8|2.6|2.8|3 |3.3|3.8|4.5|5 |
- |
No |
Yes |
|
|
MSOP8|TSSOP8 |SOP8 |
VM |
2.5 |
5.5 |
2.5 |
- |
- |
- |
200 ~ 1000 |
No |
No |
|
|
TSSOP8|SOP-8P |
VM |
1 |
5.5 |
2.5 |
5 |
1 |
2.5|3.3 |
300 |
Yes |
Yes |
|
|
SOP8 |
CM |
3 |
40 |
1.25 |
40 |
1.5 |
- |
33 ~ 100 |
Yes |
No |
|
|
TQFN5x5-32 |
CM |
2.5 |
6.5 |
2.5 |
18 |
3 |
No |
1200 |
Yes |
No |
|
|
TSOT23-5 TDFN2x2-6 |
CM |
2.5 |
6 |
2.5 |
20 |
2 |
- |
1500 |
Yes |
No |
|
|
TQFN4x4-6 TDFN3x3-12 |
CM |
1.8 |
5.5 |
2.7 |
5.5 |
5 |
- |
1.2 |
Yes |
Yes |
|
|
SOT23-5 |
CM |
2.5 |
6 |
2.5 |
32 |
1 |
- |
1000 |
Yes |
No |
|
|
TSOT-23-6 TDFN2x2-8 |
CM |
1.2 |
5.5 |
1.8 |
5.5 |
1.2 |
- |
1.2 |
Yes |
Yes |
|
