FAN5345 View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
Manufacturer
FAN5345 Datasheet PDF : 14 Pages
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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
IQ(ACTIVE) Quiescent Current at ILOAD = 0mA
VUVLO Under-Voltage Lockout Threshold
VUVHYST Under-Voltage Lockout Hysteresis
EN: Enable Pin
VIH
HIGH-Level Input Voltage
VIL
LOW-Level Input Voltage
REN EN Pull-Down Resistance
TLO
EN Low Time for Dimming(3)
THI
Delay Between Steps(3)
TSD EN Low, Shutdown Pulse Width
Feedback and Reference
VFB Feedback Voltage
IFB
Feedback Input Current
Power Outputs
RDS(ON)_Q1 Boost Switch On Resistance
ISW(OFF) SW Node Leakage(2)
ILIM-PK Boost Switch Peak Current Limit
EN = GND
Device Not Switching, No Load
VIN Rising
VIN Falling
VIN = 3.6V; Figure 28
VIN = 3.6V; Figure 28
VIN = 3.6V; from Falling Edge of EN
ILED = 20mA from -40°C to +85°C,
2.7V ≤ VIN ≤ 5.5V
VFB = 250mV
VIN = 3.6V, ISW = 100mA
VIN = 2.5V, ISW = 100mA
EN = 0, VIN = VSW = VOUT = 5.5V, VLED =
0V
FAN5345S20X: VIN = 3.2V to 4.3V, TA
= 20°C to +60°C, VF = 3.4V, 4 LEDs
FAN5345S30X
2.10
1.80
1.2
200
0.5
0.5
230
200
500
0.30
300
2.35
2.05
250
300
250
0.1
600
650
0.1
300
750
0.90 A
A
2.60
2.30
V
mV
V
0.4
V
400 k
300
µs
µs
1
ms
270 mV
1.0
A
m
2.0
A
400
mA
1000
Oscillator
fSW
Boost Regulator Switching
Frequency
0.95 1.15 1.35 MHz
Output and Protection
VOVP
Boost Output Over-Voltage
Protection
OVP Hysteresis
FAN5345S20X
FAN5345S30X
FAN5345S20X
FAN5345S30X
18.0 20.0 21.5
27.5
30.0
0.8
32.5
V
1.0
VTLSC
VOUT Short-Circuit Detection
Threshold
VOUT Falling
VIN – 1.4
V
VTHSC
DMAX
DMIN
TTSD
THYS
VOUT Short-Circuit Detection
Threshold
Maximum Boost Duty Cycle(3,4)
Minimum Boost Duty Cycle(3,4)
Thermal Shutdown
Thermal Shutdown Hysteresis
VOUT Rising
VIN – 1.2
V
85
20
%
150
°C
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.
© 2011 Fairchild Semiconductor Corporation
FAN5345 • Rev. 1.0.0
5
www.fairchildsemi.com
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