FTD1465TR [FS]
40V 600mA 1MHz synchronous Buck Converter;
| 型号： | FTD1465TR |
| 厂家： | 
First Silicon Co., Ltd |
| 描述： | 40V 600mA 1MHz synchronous Buck Converter |
| 文件： | 总9页 (文件大小：718K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SEMICONDUCTOR
FTD1465
TECHNICAL DATA
40V 600mA 1MHz synchronous Buck Converter
General Description
Features
FTD1465 is a 600mA synchronous buck converter with
integrated 900mΩ power MOSFETs. The FTD1465 design
with a current-mode control scheme, can convert wide input
voltage of 4.5V to 40V to the output voltage adjustable from
0.8V to 75%VIN to provide excellent output voltage
regulaꢀon.
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Wide Input Voltage from 4.5V to 40V
600mA Output Current
High Efficiency over 85% from Load Current 30mA
to 100mA @ VOUT>=5V
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Low EMI Converter
Adjustable Output Voltage from 0.8V to 75%VIN
Integrated 900mΩ High/Low Side MOSFET
1M Switching Frequency
The FTD1465 equipped with Power-on-reset, soꢁ start and
whole protecꢀons (under-voltage, over temperature and
current-limit) into a single package.
Stable with Low ESR Capacitors
Power-On-Reset Detecꢀon
This device, available SOT-23-6 provides a very compact
system soluꢀon of external components and PCB area.
Over-Temperature Protection
Current-Limit Protecꢀon
Enable/Shutdown Funcꢀon
Available in SOT-23-6 packages
Lead Free and Green Devices Available (RoHS
compliant).
Applications
� Smart Electronic equipments
Pin Configurations
Package Types
BS1
GND2
FB3
6SW
5VIN
4EN
SOT23-6
(Top view)
2014. 01. 04
Revision No : 0
1/9
FTD1465
PinDescription
Pin Number Pin Name Description
High-Side Gate Drive Boost Input. BS supplies the voltage to drive the high-side N-channel
MOSFET. At least 10nF capacitor should be connected from SW to BS to supply the high side
switch.
1
2
3
BS
GDN
FB
Signal and power ground.
Output feedback Input. The F TD1465 senses the feedback voltage via FB and regulates the
voltage at 0.8V. Connecꢀng FB with a resistor-divider from the converter’s output sets the
output voltage from 0.8V to 75%VIN.
Enable Input. EN is a digital input that turns the regulator on or off. EN threshold is 1.4V with
0.2V hysteresis. Pull up with 1MΩ resistor for automaꢀc startup.
Power Input. VIN supplies the power (4.5V to 40V) to the control circuitry, gate drivers and
step-down converter switches. Connecꢀng a ceramic bypass capacitor and a suitably large
capacitor between VIN and GND eliminates switching noise and voltage ripple on the input to
the IC.
4
5
6
EN
VIN
SW
Power Switching Output. It is the Drain of the N-Channel power MOSFET to supply power to
the output LC filter.
Ordering Information
FTD1465
Circuit Type
Packing:
Blank：Tube
R: Tape and Reel
Package
T：SOT23-6
2014. 01. 04
Revision No : 0
2/9
FTD1465
Function Block
Figure1 Function Block Diagram of FTD1465
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Revision No : 0
3/9
FTD1465
Absolute Maximum Ratings (Note1)
Symbol
VIN
Parameter
VIN Supply Voltage（VIN to Gnd）
SW to GND Voltage Pulse Width > 20ns
Pulse Width < 20ns
EN, FB to GND Voltage
Rating
Unit
V
-0.3 ~ 45
VSW
V
-1 ~ 45
V
-3 ~ 45
-0.3 ~ 6
V
V
BS to GND Voltage
BS to SW Voltage
VBS
VBS-SW
PD
VSW - 0.3 ~ VSW +6
-0.3 ~ 6
V
Power Dissipaꢀon
Internally Limited
150
W
ºC
ºC
ºC
Juncꢀon Temperature
TJ
Storage Temperature
TSTG
TSDR
-65 ~ 150
260
Maximum Lead Soldering Temperature (10 Seconds)
Note1: Stresses beyond those listed under "absolute maximum raꢀngs" may cause permanent damage to the device. These are stress raꢀngs only and funcꢀonal
operaꢀon of the device at these or any other condiꢀons beyond those indicated under "recommended operaꢀng condiꢀons" is not implied. Exposure to absolute
maximum raꢀng condiꢀons for extended periods may affect device reliability.
Thermal Characteristics
Symbol
Parameter
Juncꢀon-to-Ambient Resistance in free air (Note 2)
TypicalValue
Unit
θJA
250
°C/W
SOT-23-6
Note 2: θJA is measured with the component mounted on a high effecꢀve thermal conducꢀvity test board in free air.
Recommended Operation Conditions (Note3)
Symbol
Parameter
Range
Unit
VIN
VIN Supply Voltage
4.5 ~ 40
0.8V ~ 75%VIN
0 ~ 600
V
V
VOUT
IOUT
Converter Output Voltage
Converter Output Current
Conꢀnue
mA
VOUT/VIN Maximum Raꢀo(Note 4)
75
12
%
VOUT/VIN Minimum Raꢀo(Note 5)
%
oC
TA
Ambient Temperature
-40 ~ 85
2014. 01. 04
Revision No : 0
4/9
FTD1465
oC
TJ
Juncꢀon Temperature
-40 ~ 125
Note 3: Refer to the typical applicaꢀon circuit
Note 4: In applicaꢀons where he VOUT/VIN raꢀo exceeds the Maximum Raꢀo and when output loading is sufficient to make the converter enter PWM mode, the VOUT
voltage will probably drop.
Note 5: When operaꢀng below the VOUT/VIN Minimum Raꢀo, the converter has the likelihood of entering PSM mode in spite of loading
voltage is sꢀll regulated well.
is heavy. However, In PSM mode, the VOUT
Electrical Characteristics
Unless otherwise specified, these specificaꢀons apply over VIN=12V, VEN=3V and TA = -40 to 85ºC. Typical values are at TA=25ºC
FTD1465
Symbol
Test Conditions
Unit
Parameter
Min
Typ
Max
SUPPLY CURRENT
IVIN
VIN Supply Current
VFB=1V, SW=NC
VEN=0V
-
-
0.85
1
1.2
10
mA
IVIN_SD
VIN Shutdown Supply Current
µA
POWER -ON-RESET (POR)
VIN POR Voltage Threshold
VIN POR Hysteresis
REFERENCE VOLTAGE
3.7
-
3.9
0.6
VIN Rising
4.1
-
V
V
-
-3
-
0.8
-
VREF
Reference Voltage
Output Voltage Accuracy
FB input current
-
V
%
TJ=25°C, IOUT=10mA
+3
50
10
IFB
nA
OSCILLATOR AND DUTY CYCLE
FSW
800
-
1000
60
Switching Frequency
1200
80
kHz
ns
Minimum on-ꢀme
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Revision No : 0
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FTD1465
Electrical Characteristics
T A=+25ºC and VCC=15V, unless otherwise specified.
FTD1465
Typ
Symbol
Test Conditions
Unit
Parameter
Min
Max
POWER MOS FET
-
-
-
-
-
900
900
-
High Side MOSFET Resistance
Low Side MOSFET Resistance
-
-
mΩ
mΩ
µA
µA
ns
High Side Switch Leakage Current VEN=0V, VIN=40V, VSW=0V
Low Side Switch Leakage Current VEN=0V, VIN=40V, VSW=0V
Dead-ꢀme
2
2
-
-
10
PROTECTIONS
ILIM
High Side MOSFET Current-Limit
Under-Voltage Protecꢀon (UVP)
Over-Temperature Protecꢀon
Over-Temperature Hysteresis
0.6
40
-
0.7
50
0.8
60
-
A
%VREF
oC
oC
150
30
-
-
SOFT-START, ENABLE
tSS
Soꢁ Start Time
-
1.2
-
1
1.4
0.2
50
2
-
1.6
-
ms
V
EN Rising Threshold Voltage
EN Falling Threshold Hysteresis
EN Turn on delay
VIN=4.5V ~ 40V
VIN=4.5V ~ 40V
V
-
-
µS
µA
V
EN Input Current
VEN=2V
VEN=6V
-
-
EN Clamp High
4
-
5
6
EN Input Current
-
10
µA
Note 6: Techcode guarantee the SW maximum duty cycle. The maximum percentage of converter output over input voltage depends on load current.
2014. 1. 04
Revision No : 0
6/9
FTD1465
Typical Application Circuit
Vin
24V
VIN
BS
L1
22uH
C3
0.1uf
C1
4.7uf
Vout
12V
SW
C2
10uf
Note:this diode
should be added
when Vin>18V
R1
140kΩ
R3
1MΩ
FB
EN
R2
10kΩ
GND
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Revision No : 0
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FTD1465
Application Information
Main Control Loop
Soft-Start
The FTD1465is a constant frequency, synchronous recꢀfier
and current-mode switching regulator. In normal operaꢀon,
the internal upper power MOSFET is turned on each cycle.
The peak inductor current at which ICMP turn off the upper
MOSFET is controlled by the voltage on the COMP node,
which is the output of the error amplifier(EAMP). An
external resisꢀve 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 decrease in VFB relaꢀve to the 0.8V
reference, which in turn causes the COMP voltage to
increase unꢀl the average inductor current matches the new
load current.
The FTD1465provides built-in soꢁ-start funcꢀon to limit the
inrush current. The soꢁ-start ꢀme is 1ms。
Bootstrap Capacitor
The FTD1465is a N-channel MOSFET step down converter.
The MOSFET requires a gate voltage that is higher than input
voltage, thus a boost capacitor should be connected
between SW and BST pins to drive the gate of the N-channel
MOSFET. Typical boostrap capacitor value is from 10nF to
100nF.
Over-Current-Protection and Hiccup
The FTD1465 has a cycle-by-cycle over-current limit when the
inductor current peak value exceeds the set current limit
threshold. Meanwhile, the output voltage drops unꢀl FB is
below the Under-Voltage (UV) threshold below the
reference. Once UV is triggered, the FTD1465 enters hiccup
mode to periodically restart the part. This protecꢀon mode
is especially useful when the output is dead-shorted to
ground. The average short circuit current is greatly reduced
to alleviate thermal issues and to protect the regulator. The
FTD1465 exits the hiccup mode once the over-current
condiꢀon is removed.
VIN Power-On-Reset (POR)
The FTD1465 keep monitoring the voltage on VIN pin to
prevent wrong logic operaꢀons which may occur when VIN
voltage is not high enough for the internal control circuitry
to operate. The VIN POR has a rising threshold of 3.9V
(typical) with 0.6V of hysteresis.
Aꢁer the VIN voltages exceed its respecꢀve POR thresholds,
the IC starts a start-up process and then ramps up the
output voltage to the seꢂng of output voltage. Connect a
RC network from EN to GND to set a turn-on delay that can
be used to sequence the output voltages of mulꢀple
devices.
Over-Temperature Protection (OTP)
The over-temperature circuit limits the juncꢀon
temperature of the FTD1465. When the juncꢀon temperature
exceeds 150ºC, a thermal sensor turns off the N-channel
power MOSFET, allowing the device to cool down. The
thermal sensor allows the converter to start a start-up
process and regulate the output voltage again aꢁer the
juncꢀon temperature cools by 30ºC. The OTP designed with
a 30ºC hysteresis lowers the average TJ during conꢀnuous
thermal overload condiꢀons, increasing life ꢀme of the
FTD1465.
Enable/Shutdown
Driving EN to ground places the FTD1465 in shutdown. When
in shutdown, the internal power MOSFETes turn off, all
internal circuitry shuts down and the quiescent supply
current of VlN reduces to <10µA, the EN under-
voltage-lockout (UVLO) has a rising threshold of 1.4V(typical)
with 0.2V of hysteresis.
2014. 01. 04
Revision No : 0
8/9
FTD1465
Package Information
SOT23-6 Package Outline Dimensions
2014. 01. 04
Revision No : 0
9/9
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