Diodes AP3202 - Manual (Page 5)

Preliminary Datasheet
380kHz, 2A Asynchronous DC-DC Buck Converter AP3202
Mar. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
5
Electrical Characteristics
V
IN
=V
EN
=12V, V
OUT
=3.3V, unless otherwise specified. Specification with standard typeface are for
T
A
=25 o C, and those in boldface type apply over the full operating temperature range (T
A
=-40 o C to 85 o C)
Parameter Symbol Conditions Min Typ Max Unit
Input Voltage V
IN
4.75 18 V
Quiescent Current I
Q
V
FB
=1.4V, V
EN
=2V 1.0 1.5 mA
Shutdown Supply Current I
SHDN
V
EN
=0V 1 10 µA
Feedback Voltage V
FB
1.185 1.222 1.258 V
Feedback Over Voltage
Threshold
V
FBOV
1.48 V
Feedback SCP Voltage Threshold V
FBSCP
0.6 V
Feedback Bias Current I
FB
V
FB
=1V -0.1 0.1 µA
High-side Switch On-resistance (Note 2) R
DSONH
I
SW
=0.5A 0.22 Ω
Low-side Switch On-resistance (Note 2) R
DSONL
I
SW
=0.05A 10 Ω
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
2.8 3.8 A
Low-side Switch Current Limit I
LIML
From drain to source 0.15 A
V
ENH
1.5
EN Pin Threshold
V
ENL
0.5
V
EN Pull-up Current I
EN-PH
V
EN
=0V 1.0 µA
Input UVLO Threshold V
UVLO
V
IN
Rising 3.5 3.9 4.4 V
Input UVLO Hysteresis V
HYS
0.3 V
Oscillator Frequency F
OSC1
380 kHz
Short Circuit Oscillator
Frequency
F
OSC2
90 kHz
Maximum Duty Cycle D
MAX
V
FB
=1.0V 90 %
Minimum Duty Cycle D
MIN
V
FB
=1.5V 0 %
Error Amplifier Voltage Gain (Note 3) A
EA
400 V/V
Error Amplifier Transconductance G
EA
700 µA/V
COMP to Current Sense
Transconductance
G
CS
2.4 A/V
Thermal Shutdown (Note 3) T
OTSD
160 ºC
Thermal Shutdown Hysteresis (Note 3) T
HYS
30 ºC
Soft-start Time (Note 3) t
SS
I
OUT
=0A 500 µs
Note 2: R
DSON
=
SW2 SW1
SW2 SW1
I - I
V - V
Note 3: Not tested, guaranteed by design.