AP6508 Datasheet, PDF (4/14 Pages) Diodes Incorporated – 500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER

AP6508
500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER
Electrical Characteristics (V_IN = 12V, T_A = +25°C, unless otherwise noted)
Symbol
Parameter
Test Conditions
Min
I_IN
Shutdown Supply Current
V_EN = 0V
I_IN
Supply Current (Quiescent)
V_EN = 2.0V, V_FB = 1.0V
R_DS(ON)1
High-Side Switch On-Resistance
(Note 6)
R_DS(ON)2
Low-Side Switch On-Resistance
(Note 6)
SW_LKG Switch Leakage Current
V_EN = 0V, V_SW = 0V
I_Limit
Current Limit
F_SW
Oscillator Frequency
V_FB = 0.75V
350
F_FB
Fold-back Frequency
V_FB = 300mV
D_MAX
Maximum Duty Cycle
V_FB = 700mV
80
V_FB
Feedback Voltage
T_A = -20°C to +85°C
791
I_FB
Feedback Current
V_FB = 800mV
V_{EN_Rising} EN Rising Threshold
1.1
V_{EN_HYS} EN Threshold Hysteresis
I_EN
EN_TD-Off
EN Input Current
EN Turn Off Delay
(Note 6)
V_EN = 2V
V_EN = 0V
PG_Vth-Hi Power Good Rising Threshold
PG_Vth-Lo Power Good Falling Threshold
PG_TD
Power Good Delay
V_PG
Power Good Sink Current Capability
I_{PG_LEAK} Power Good Leakage Current
I_SS
Soft-Start Current
INUV_Vth V_IN Under Voltage Threshold Rising
4.0
INUV_HYS
V_IN Under Voltage Threshold
Hysteresis
V_CC
V_CC Regulator
V_CC Load Regulation
Icc=5mA
T_SD
Thermal Shutdown
Note: 6. Guaranteed by design
Typ.
0
1.2
120
20
0
5.8
500
0.3
85
807
10
1.3
0.4
2
0
5
0.9
0.7
20
0.4
10.5
4.2
200
5
5
140
Max
10
650
823
50
1.5
10
4.4
Unit
µA
mA
mΩ
mΩ
µA
A
kHz
f_SW
%
mV
nA
V
V
μA
μs
V_FB
V_FB
μs
V
nA
μA
V
mV
V
%
°C
AP6508
Document number: DS33437 Rev. 4 - 2
4 of 14
www.diodes.com
July 2011
© Diodes Incorporated