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Electrical Specifications
V IN = 2.5V to 5.5V and T A = -40°C to +85°C unless otherwise noted. Typical values are at T A = +25°C and V IN = 3.6V.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Unit
Power Supplies
I SD
I Q(ACTIVE)
Shutdown Supply Current
Quiescent Current at I LOAD = 0mA
EN = GND
Device Not Switching, No Load
0.30
300
0.90
μ A
μ A
V UVLO
Under-Voltage Lockout Threshold
V IN Rising
V IN Falling
2.10
1.80
2.35
2.05
2.60
2.30
V
V UVHYST
Under-Voltage Lockout Hysteresis
250
mV
EN: Enable Pin
V IH
V IL
HIGH-Level Input Voltage
LOW-Level Input Voltage
1.2
0.4
V
V
PWM Dimming Frequency
R EN
f PWM
t SD
EN Pull-Down Resistance
(3)
EN LOW, Shutdown Pulse Width
V IN = 3.6V; from Falling Edge of EN
200
5
300
400
100
1
k Ω
kHz
ms
Feedback and Reference
V FB
I FB
Feedback Voltage
Feedback Input Current
I LED = 20mA from -40°C to +85°C,
2.5V ≤ V IN ≤ 5.5V
V FB = 250mV
230
250
0.1
270
1.0
mV
μ A
Power Outputs
R DS(ON)_Q1 Boost Switch On Resistance
V IN = 3.6V, I SW = 100mA
V IN = 2.5V, I SW = 100mA
600
650
m Ω
I SW(OFF)
SW Node Leakage (2)
EN = 0, V IN = V SW = V OUT = 5.5V,
V LED = 0V
0.1
2.0
μ A
I LIM-PK
Boost Switch Peak Current Limit
FAN5346S20X: V IN = 3.2V to 4.3V,
T A =-20°C to +60°C, V F = 3.4V, 4 LEDs
200
300
400
mA
FAN5346S30X
500
750
1000
Oscillator
f SW
Boost Regulator Switching
Frequency
0.95
1.15
1.35
MHz
Output and Protection
Boost Output Over-Voltage
FAN5346S20X
18.0
20.0
21.5
V OVP
Protection
OVP Hysteresis
FAN5346S30X
FAN5346S20X
FAN5346S30X
27.5
30.0
0.8
1.0
32.5
V
V TLSC
V THSC
D MAX
D MIN
T TSD
T HYS
V OUT Short-Circuit Detection
Threshold
V OUT Short-Circuit Detection
Threshold
Maximum Boost Duty Cycle (3,4)
Minimum Boost Duty Cycle (3,4)
Thermal Shutdown
Thermal Shutdown Hysteresis
V OUT Falling
V OUT Rising
85
V IN – 1.4
V IN – 1.2
150
35
20
V
V
%
°C
°C
Notes:
2. SW leakage current includes the leakage current of two internal switches; SW to GND and SW to V OUT .
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
FAN5346 ? Rev. 1.0.1
5
www.fairchildsemi.com
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