600kHz 3A Step-Down Switching Regulator
ELECTRICAL CHARACTERISTICS
Unless specified: V
IN
= 12V, V
COMP
= 0.8V, V
BST
= V
IN
+ 5V, EN = tied to V
IN
, SW = open. T
J
= -40°C to 125°C.
PARAMETER
Operating Input Voltage
Maximum Switch Current Limit
Oscillator Frequency
Switch On Voltage Drop
V
IN
Undervoltage Lockout
V
IN
UVLO Hysteresis
V
IN
Supply Current
Standby Current
Feedback Input Current
Feedback Voltage
Feedback Voltage Line Regulation
(2)
FB to V
COMP
Voltage Gain
(3)
FB to V
COMP
Transconductance
(3)
V
COMP
Pin Source Current
V
COMP
Pin Sink Current
V
COMP
Pin to Switch Current
Transconductance
V
COMP
Pin
Maximum Switching Threshold
V
COMP
OCP Threshold
V
COMP
Hiccup Retry Threshold
Maximum, Switch Duty Cycle
Minimum Boost Voltage
Above Switch
Boost Current
Enable Input Threshold Voltage
Enable Output Bias Current
V
ETH
I
EOL
I
EOH
EN = 50mV below threshold
EN = 50mV above threshold
I
SW
= 1A
I
SW
= 3A
1.1
I
Q
I
Q(OFF)
I
FB
V
FB
4.4V < V
IN
< 24V
0.9V
≤
V
COMP
≤
2.0V
∆I
COMP
= ±10uA
V
FB
= 0.6V
V
FB
= 1.0V
V
COMP
= 1.25V
Duty cycle = 0%
V
COMP
rising
V
COMP
falling
V
COMP
= 1.2V, I
SW
= 400mA
85
2.7
10
30
1.27
8
10
150
500
0.784
V
FB
= 1V
V
EN
= 0V
SYMBOL
V
IN
I
SW
f
OSC
V
D(SW)
V
UVLO
I
SW
= 3A
T
A
= 25℃, D = 50%
3.5
500
600
570
3.9
60
3
100
-0.25
0.8
+3
350
850
70
-70
5
0.6
2
0.25
TEST CONDITION
MIN.
TYP.
TJ4519
MAX.
24
(1)
5.5
700
UNIT
V
A
kHz
mV
4.4
V
mV
5
150
-1
0.816
mA
uA
uA
V
mV/V
V/V
1300
110
-110
uMho
uA
uA
A/V
V
V
V
%
V
15
mA
45
1.5
V
uA
uA
Notes:
(1) The device may not function properly outside its operating input voltage range.
(2) The required minimum input voltage for a regulated output depends on the output voltage and load condition.
(3) Guaranteed by design.
Jul. 2010 – Preliminary
-4-
HTC
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
