Diodes AP3440 - Manual (Page 5)

AP3440
Document number: DS36691 Rev. 2 - 2
5 of 15
www.diodes.com
March 2014
© Diodes Incorporated
AP3440
A Product Line of
Diodes Incorporated
N
E
W
P
R
O
D
U
C
T
Electrical Characteristics
(Cont.) (@V
IN
=2.95 to 5.5V, T
A
=+25ºC, unless otherwise specified. Specifications with boldface type
apply over full operating temperature range from -40 to +85ºC.)
Symbol Parameters Conditions Min Typ Max Unit
VOLTAGE REFERENCE (FB PIN)
V
REF
Voltage Reference 2.95V≤V
IN
≤5.5V 0.779 0.803 0.827 V
MOSFET
R
ON_H
High Side Switch On-
resistance
V BOOT-SW =5V — 30 60 m 
V
BOOT-SW
=2.95V — 44 70 m

R
ON_L
Low Side Switch On-
resistance
V
IN
=5V — 30 60 m

V IN =2.95V — 44 70 m Ω
CURRENT LIMIT
I
LIMIT
Current Limit Threshold — 4.2 7.0 — A
THERMAL SHUTDOWN
T
TSD
Thermal Shutdown — — 140 — 
C
— Hysteresis — — 20 — 
C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
—
Switching Frequency Range
(RT Mode)
— 200 — 2000 kHz
—
Switching Frequency Range
(CLK Mode)
— 300 — 2000 kHz
f
S
Switching Frequency R
T
=400k
 400 500 600 kHz
— Minimum CLK Pulse Width — 75 — — ns
— RT/CLK Voltage R
T
=400k  — 0.5 — V
— RT/CLK High Threshold — — 1.6 2.2 V
— RT/CLK Low Threshold — 0.4 0.6 — V
BOOT (BOOT PIN)
R
BOOT
BOOT Charge Resistor V
IN
=5V — 16 — 
— BOOT-SW UVLO V IN =2.95V — 2.2 — V
SOFT START (SS PIN)
I
SS
Charge Current V
SS
=0.4V — 2 — m
A
V SS
SS to Reference Crossover 98% Nominal — 1.1 — V
POWER GOOD (PGD PIN)
V
FB_TH
Feedback Threshold
V
FB
Falling (Fault) — 91 —
%V
REF
V FB Rising (Good) — 93 —
V
FB
Rising (Fault) — 107 —
V
FB
Falling (Good) — 105 —