FAN5340 Datasheet, PDF (5/12 Pages) Fairchild Semiconductor – Synchronous Constant-Current Series Boost LED Driver with PWM Brightness Control and Integrated Load Disconnect

Electrical Specifications
VIN = 2.7V to 4.8V 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. Units
Power Supplies
IQ
Quiescent Current
EN = VIN, Device Not Switching
1
mA
ISD Shutdown Supply Current
EN = GND, VIN = 3.6V
0.3
1.0 μA
VUVLO Under-Voltage Lockout
VIN Rising
VIN Falling
2.30 2.40 2.50 V
2.00 2.15 2.25 V
VUVHYST Under-Voltage Lockout Hysteresis
EN: Enable Pin
250
mV
VIH HIGH-Level Input Voltage
VIL LOW-Level Input Voltage
1.2
V
0.4
V
REN EN Pull-Down Resistance
200
300
400 kΩ
tSD EN Low to Shutdown Delay
From Falling Edge of EN
20
Feedback and Reference
80
ms
VFB Feedback Voltage
480 500 520 mV
IFB Feedback Input Current
VFB = 500mV
0.1
1.0 μA
Power Outputs
VIN = 3.6V, VOUT = 10V, ISW = 100mA
600
RDS(ON)_Q1 Boost Switch On-Resistance
mΩ
VIN = 2.7V, VOUT = 10V, ISW = 100mA
850
RDS(ON)_Q2 Synchronous Rectifier On-Resistance VOUT = 10V, ISW = 100mA
2.0
Ω
RDS(ON)_Q3 Load Switch On-Resistance
VOUT = 10V, ILED = 10mA
2.8
Ω
ISW(OFF) SW Node Leakage⁽²⁾
EN = 0, VIN = VSW = VOUT = 5.5V,
VLED = 0
0.1
1.0 μA
ILIM-PK Boost Switch Peak Current Limit
Oscillator
VIN = 3.6V
325
400
475 mA
fSW Boost Regulator Switching Frequency
PWM Dimming
DPWM PWM Duty Cycle⁽³⁾
Output and Protection
PWM Dimming Frequency ≤1kHz
1.0
1.2
1.4 MHz
1.0
100 %
VOVP Boost Output Over-Voltage Protection
VOVPHYST OVP Hysteresis
18.0 19.0 20.0 V
0.8
V
VTHSC
DMAX
DMIN
VLED Short-Circuit Detection Threshold
Maximum Boost Duty Cycle⁽³⁾
Minimum Boost Duty Cycle⁽³⁾
VOUT Falling
VOUT Rising
VIN – 1.5
V
VIN – 1.3
V
85
%
20
%
TSD Thermal Shutdown
150
°C
THYS Thermal Shutdown Hysteresis
25
°C
Notes:
2. SW leakage current includes the leakage current of three internal switches; SW to GND, VOUT to VLED, and SW to VOUT.
3. Guaranteed by design.
© 2010 Fairchild Semiconductor Corporation
FAN5340 • Rev. 1.0.1
5
www.fairchildsemi.com