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FAN5345 データシート(PDF) 5 Page - Fairchild Semiconductor

部品番号 FAN5345
部品情報  Series Boost LED Driver with Single-Wire Digital Interface
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メーカー  FAIRCHILD [Fairchild Semiconductor]
ホームページ  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN5345 データシート(HTML) 5 Page - Fairchild Semiconductor

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© 2011 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN5345 • Rev. 1.0.0
5
Electrical Specifications
VIN = 2.5V to 5.5V and TA = -40°C to +85°C unless otherwise noted. Typical values are at TA = +25°C and VIN = 3.6V.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Power Supplies
ISD
Shutdown Supply Current
EN = GND
0.30
0.90
A
IQ(ACTIVE)
Quiescent Current at ILOAD = 0mA
Device Not Switching, No Load
300
A
VUVLO
Under-Voltage Lockout Threshold
VIN Rising
2.10
2.35
2.60
V
VIN Falling
1.80
2.05
2.30
VUVHYST
Under-Voltage Lockout Hysteresis
250
mV
EN: Enable Pin
VIH
HIGH-Level Input Voltage
1.2
V
VIL
LOW-Level Input Voltage
0.4
V
REN
EN Pull-Down Resistance
200
300
400
k
TLO
EN Low Time for Dimming
(3)
VIN = 3.6V; Figure 28
0.5
300
µs
THI
Delay Between Steps
(3)
VIN = 3.6V; Figure 28
0.5
µs
TSD
EN Low, Shutdown Pulse Width
VIN = 3.6V; from Falling Edge of EN
1
ms
Feedback and Reference
VFB
Feedback Voltage
ILED = 20mA from -40°C to +85°C,
2.7V ≤ VIN ≤ 5.5V
230
250
270
mV
IFB
Feedback Input Current
VFB = 250mV
0.1
1.0
A
Power Outputs
RDS(ON)_Q1 Boost Switch On Resistance
VIN = 3.6V, ISW = 100mA
600
m
VIN = 2.5V, ISW = 100mA
650
ISW(OFF)
SW Node Leakage
(2)
EN = 0, VIN = VSW = VOUT = 5.5V, VLED =
0V
0.1
2.0
A
ILIM-PK
Boost Switch Peak Current Limit
FAN5345S20X: VIN = 3.2V to 4.3V, TA
= 20°C to +60°C, VF = 3.4V, 4 LEDs
200
300
400
mA
FAN5345S30X
500
750
1000
Oscillator
fSW
Boost Regulator Switching
Frequency
0.95
1.15
1.35
MHz
Output and Protection
VOVP
Boost Output Over-Voltage
Protection
FAN5345S20X
18.0
20.0
21.5
V
FAN5345S30X
27.5
30.0
32.5
OVP Hysteresis
FAN5345S20X
0.8
FAN5345S30X
1.0
VTLSC
VOUT Short-Circuit Detection
Threshold
VOUT Falling
VIN – 1.4
V
VTHSC
VOUT Short-Circuit Detection
Threshold
VOUT Rising
VIN – 1.2
V
DMAX
Maximum Boost Duty Cycle
(3,4)
85
%
DMIN
Minimum Boost Duty Cycle
(3,4)
20
TTSD
Thermal Shutdown
150
°C
THYS
Thermal Shutdown Hysteresis
35
°C
Notes:
2.
SW leakage current includes the leakage current of two internal switches; SW to GND and SW to VOUT.
3.
Not tested in production; guaranteed by design.
4.
Application should guarantee that minimum and maximum duty cycle fall between 20-85% to meet the specified range.


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