AP2004
PWM BUCK CONTROLLER
AP2004 Rev. 3 4 of 8 FEBRUARY 2009
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Electrical Characteristics (TA = 25ºC, VCC = 6V, f = 200 Khz)
Reference (REF)
Symbol Parameter Conditions Min Typ. Max Unit
VREF Comp connect to FB 1.225 1.25 1.275 V
Output voltage change with
temperature TA = -20ºC ~ 25ºC -0.1 ±1 %
TA = 25ºC ~ 85ºC -0. 2 ±1 %
Under voltage lockout (UVLO)
Symbol Parameter Conditions Min Typ. Max Unit
VUT Upper threshold voltage (VCC) IO(REF) = 0.1mA
TA = 25ºC
2.9 V
VLWT Lower threshold vo ltage (VCC) 2.4 V
VHT Hysteresis (VCC) 500 mV
Short-circuit protection (SCP) control
Symbol Parameter Conditions Min Typ. Max Unit
VIT Input threshold voltage TA = 25ºC 0.60 0.67 0.75 V
VSTB Standby voltage No pull up 100 130 160 mV
VLT Latched input voltage No pull up 50 100 mV
ISCP Input (source) current VI = 0.7V, TA = 25ºC -10 -15 -20 µA
VCT Comparator threshold voltage
(COMP) 1.5 V
Oscillator (OSC)
Symbol Parameter Conditions Min Typ. Max Unit
FOSC Frequency CT = 270 pF 200 KHz
ΔFOSC Standard deviation of frequency CT = 270 pF 10 %
Frequency change with voltage VCC = 3.6V ~ 20V 1
Error-amplifier
Symbol Parameter Conditions Min Typ. Max Unit
VIO Input offset voltage VO (FB) = 1.25V ±6 mV
IIO Input offset current VO (FB) = 1.25V ±100 nA
IIB Input bias current VO (FB) = 1.25V 160 500 nA
VCM Common-mode input voltage range VCC = 3.6V ~ 20V 1.05 1. 45 V
AV Open-loop voltage amplification RF = 200 kΩ 70 80 dB
GBW Unity-gain bandwidth 1.5 MHz
CMRR Common-mode rejection ratio 60 80 dB
VOH Max. output voltage Vref-0.1 V
VOL Min. output voltage 1 V
IOI Output (sink) current (COMP) VID = -0.1V, VO = 1.25V 0.5 1.6 mA
IOO Output (source) current (COMP) VID = 0.1V, VO = 1.25V -45 -70 µA