FAN5308 Datasheet, PDF (4/11 Pages) Fairchild Semiconductor – 800mA High-Efficiency Step-Down DC-DC Converter

Electrical Characteristics
V_IN = V_OUT + 0.6V(min. 2.5V) to 5.5V, I_OUT = 350mA, V_OUT =1.2V, EN = V_IN, T_A = -40°C to +85°C, Unless
otherwise noted. Typical values are at T_A = 25°C.
Symbol
Parameter
Conditions
Min. Typ. Max. Units
V_IN Input Voltage
I_Q Quiescent Current
0 mA ≤ I_OUT ≤ 800 mA
2.5
5.5
V
I_OUT = 0mA, Device is not switching
20
35
µA
I_OUT = 0mA, Device is
R2 =10KΩ
50
µA
switching (Note 5)
R2 =100KΩ
25
µA
V_ENH
V_ENL
I_EN
R_DS-ON
I_LIM
I_{lkg_(N)}
I_{lkg_(P)}
Vref
Shutdown Supply Current EN = GND
Undervoltage
Threshold
Lockout V_IN Rising
Hysteresis
Enable High Input Voltage
Enable Low Input Voltage
EN input bias current
PMOS On Resistance
NMOS On Resistance
P-channel current limit
Oscillator frequency
EN = V_IN or GND
V_IN = V_GS = 5.5V
V_IN = V_GS = 2.5V
V_IN = V_GS = 5.5V
V_IN = V_GS = 2.5V
2.5V < V_IN < 5.5V
N-channel leakage current
P-channel leakage current
Line regulation
Load regulation
Reference Voltage
V_DS = 5.5V
V_DS = 5.5V
I_OUT = 10 mA
350 mA ≤ I_OUT ≤ 800 mA
Output DC Voltage Accuracy 0 mA ≤ I_OUT ≤ 800 mA
(Note 6)
Over-Temperature Protection PWM Mode Only
350 mA ≤ I_OUT ≤ 800 mA
Rising
Temperature
Hysteresis
Start-Up Time
I_OUT = 800mA, C_OUT = 20µF
1.9
1.3
1300
1000
-3
0.1
2.1
150
0.01
250
300
200
250
1500
1300
0.1
0.1
0.16
0.15
0.8
150
20
800
1
µA
2.3
V
mV
V
0.4
V
0.1
µA
350
mΩ
400
300
mΩ
350
2000
mA
1500
KHz
1
µA
1
µA
%/V
%
V
+3
%
°C
°C
µS
Notes:
5. Refer to the application section for further details.
6. For output voltages ≤ 1.2V a 40µF output capacitor value is required to achieve a maximum output accuracy of 3% while operating in power save mode
(PFM mode).
FAN5308 Rev. 1.0.1
4
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