600kHz 3A Step-Down Switching Regulator
TJ4519
ELECTRICAL CHARACTERISTICS
Unless specified: VIN = 12V, VCOMP = 0.8V, VBST = VIN + 5V, EN = tied to VIN, SW = open. TJ = -40°C to 125°C.
PARAMETER
Operating Input Voltage
Maximum Switch Current Limit
Oscillator Frequency
SYMBOL
VIN
TEST CONDITION
TA = 25℃, D = 50%
ISW = 3A
MIN.
TYP.
MAX.
UNIT
V
24(1)
5.5
ISW
3.5
A
fOSC
500
600
570
3.9
60
700
kHz
mV
V
Switch On Voltage Drop
VIN Undervoltage Lockout
VIN UVLO Hysteresis
VD(SW)
VUVLO
4.4
mV
mA
uA
VIN Supply Current
IQ
IQ(OFF)
IFB
VFB = 1V
VEN = 0V
3
5
150
-1
Standby Current
100
-0.25
0.8
+3
Feedback Input Current
Feedback Voltage
uA
VFB
0.784
0.816
V
Feedback Voltage Line Regulation(2)
FB to VCOMP Voltage Gain(3)
FB to VCOMP Transconductance(3)
VCOMP Pin Source Current
VCOMP Pin Sink Current
4.4V < VIN < 24V
0.9V ≤ VCOMP ≤ 2.0V
∆ICOMP = ±10uA
VFB = 0.6V
mV/V
V/V
uMho
uA
150
500
350
850
70
1300
110
VFB = 1.0V
-70
-110
uA
VCOMP Pin to Switch Current
Transconductance
VCOMP = 1.25V
5
A/V
V
VCOMP Pin
Maximum Switching Threshold
Duty cycle = 0%
0.6
VCOMP OCP Threshold
VCOMP rising
VCOMP falling
2
V
V
VCOMP Hiccup Retry Threshold
Maximum, Switch Duty Cycle
0.25
VCOMP = 1.2V, ISW = 400mA
85
%
Minimum Boost Voltage
Above Switch
2.7
V
ISW = 1A
ISW = 3A
10
30
15
45
Boost Current
mA
Enable Input Threshold Voltage
VETH
IEOL
1.1
1.27
8
1.5
V
EN = 50mV below threshold
EN = 50mV above threshold
uA
uA
Enable Output Bias Current
Notes:
IEOH
10
(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. ]
