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Electrical Specifications
V IN = 2.7V 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.
Units
Power Supplies
I SD
Shutdown Supply Current
EN = GND, V IN = 3.6V
0.30
0.75
μ A
V UVLO
Under-Voltage Lockout
Threshold
V IN Rising
V IN Falling
2.10
1.90
2.35
2.15
2.60
2.40
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
R EN
EN Pull-Down Resistance
200
300
400
k Ω
T LO
T HI
T SD
EN Low Time for Dimming
Time Delay Between Steps
EN Low, Shutdown Pulse Width
V IN = 3.6V; See Figure 14
V IN = 3.6V; See Figure 14
V IN = 3.6V; from Falling Edge of EN
0.5
0.5
1
300
μs
μs
ms
Feedback and Reference
V FB
I FB
Feedback Voltage
Feedback Input Current
I LED = 20mA from -40°C to +85°C,
2.7V ≤ V IN ≤ 5.5V
V FB = 253mV
240
253
0.1
266
1.0
mV
μ A
Power Outputs
R DS(ON)_Q1
Boost Switch On-Resistance
V IN = 3.6V, I SW = 100mA
V IN = 2.7V, I SW = 100mA
600
650
m Ω
SW Node Leakage
I SW(OFF)
I LIM-PK
(1)
Boost Switch Peak Current Limit
EN = 0, V IN = V SW = V OUT = 5.5V,
V LED = 0
V IN = 3.6V
0.1
750
2.0
μ A
mA
Oscillator
f SW
Boost Regulator Switching
Frequency
1.0
1.2
1.4
MHz
Output and Protection
V OVP
Boost Output Over-Voltage
Protection
18.0
18.9
21.0
V
OVP Hysteresis
0.8
Maximum Boost Duty Cycle
Minimum Boost Duty Cycle
V TLSC
V THSC
D MAX
D MIN
T TSD
T HYS
V OUT Short Circuit Detection
Threshold
V OUT Short Circuit Detection
Threshold
(2,3)
(2,3)
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:
1. SW leakage current includes the leakage current of 2 internal switches; SW to GND and SW to VOUT .
2. Not tested in production and guaranteed by design.
3. Application should guarantee that minimum and maximum duty cycle should fall between 20-85% to meet the specified
range.
? 2009 Fairchild Semiconductor Corporation
FAN5341 ? Rev. 1.0.1
5
www.fairchildsemi.com
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