Preliminary datasheet, Electrical characteristics, Parameter symbol conditions min typ max unit – Diodes AP3512E User Manual
Page 5
Preliminary Datasheet
18V, 2A Synchronous DC-DC Buck Converter AP3512E
Dec. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
5
Electrical Characteristics
V
IN
=V
EN
=12V, V
OUT
=3.3V, T
A
=25ºC, unless otherwise specified.
Parameter Symbol
Conditions
Min
Typ
Max
Unit
SUPPLY VOLTAGE (IN PIN)
Input Voltage
V
IN
4.5 18 V
Quiescent Current
I
Q
V
FB
=1V,
V
EN
=3.3V
1.2
1.4
mA
Shutdown Supply Current
I
SHDN
V
EN
=0V
0.1
1.0
µA
UNDER VOLTAGE LOCKOUT
Input UVLO Threshold
V
UVLO
V
IN
Rising
3.65
4.0
4.25
V
Input UVLO Hysteresis
V
HYS
0.2 V
ENABLE (EN PIN)
EN Shutdown Threshold Voltage
1.1 1.5 2 V
EN Shutdown Threshold Voltage
Hysteresis (Note 2)
350
mV
EN Lockout Threshold Voltage
2.2 2.5 2.7 V
EN Lockout Hysteresis
210
mV
VOLTAGE REFERENCE (FB PIN)
Feedback Voltage
V
FB
0.907
0.925
0.943
V
Feedback Over Voltage Threshold
V
FBOV
1.1 V
Feedback Bias Current
I
FB
V
FB
=1V -0.1
0.1
µA
MOSFET
High-side Switch On-resistance
(Note 3)
R
DSONH
I
SW
=0.2A&0.7A
100
mΩ
Low-side Switch On-resistance
(Note 3)
R
DSONL
I
SW
=-0.2A&-0.7A 100 mΩ
CURRENT LIMIT
High-side Switch Leakage
Current
I
LEAKH
V
IN
=18V, V
EN
=0V,
V
SW
=0V
0.1 10 μA
High-side Switch Current Limit
I
LIMH
4.3 5.6 A
Low-side Switch Current Limit
I
LIML
From drain to
source
50 mA
SWITCHING REGULATOR
Oscillator Frequency
f
OSC1
410
500
590
kHz
Short Circuit Oscillator
Frequency
f
OSC2
180
kHz