Fast PFET Buck Controller
LM51031
ELECTRICAL CHARACTERISTICS
(Specifications apply for 4.5V ≤ VCC ≤ 16V, 3V ≤ VC ≤ 16V, 0℃ ≤ TJ ≤ 125℃, unless otherwise specified.)
Characteristic
Test Conditions
Min
TYP
Max
Unit
VFB = 1.2V
Oscillator
COSC = 470 pF
Frequency
160
-
200
110
680
83.3
240
-
kHz
uA
uA
%
1.4 V < VCOSC < 2.0 V
2.7 V > VCOSC > 2.0 V
1 - (tOFF/tON)
Charge Current
Discharge Current
Maximum Duty Cycle
Short Circuit Timer
Charge Current
-
-
80.0
-
VFB = 1.0 V; CS = 0.1 uF; VCOSC = 2.0 V
1.0 V < VCS < 2.0 V
2.55 V > VCS < 2.4 V
2.4 V < VCS < 1.5 V
0 V < VCS < 2.5 V
2.6 V > VCS > 2.4 V
2.4 V > VCS > 1.5 V
-
175
40.0
4.0
0.7
0.2
9.0
2.5
264
66
325
80
uA
uA
uA
ms
ms
ms
%
Fast Discharge Current
Slow Discharge Current
Start Fault Inhibit Time
Valid Fault Time
6
10
0.85
0.3
15
1.4
0.45
23
GATE Inhibit Time
Fault Duty Cycle
3.1
4.6
CS Comparator
VFB = 1.0 V
Fault Enable CS Voltage
Max CS Voltage
-
-
-
2.5
2.6
-
-
V
V
V
V
V
V
VFB = 1.5 V
VCS = when GATE goes high
Minimum VCS
Fault Detect Voltage
Fault Inhibit Voltage
Hold Off Release Voltage
-
2.4
-
-
1.5
-
VFB = 0 V
0.4
0.725
0.7
1.0
1.035
VCS = 1.5 V
Regulator Threshold Voltage Clamp
CFB Comparator
Regulator Threshold Voltage
0.866
VCOSC = VCS = 2.0 V
TJ = 25℃ (Note 3)
TJ = 0 to 125℃
TJ = 25℃ (Note 3)
TJ = 0 to 125℃
4.5 V ≤ VCC ≤ 16 V
VFB = 0 V
1.225
1.210
1.12
1.10
-
1.250
1.250
1.15
1.15
6
1.275
1.290
1.17
1.19
15
V
V
Fault Threshold Voltage
V
V
Threshold Line Regulation
mV
uA
Input Bias Current
Voltage Tracking
-
1
4
(Regulator Threshold - Fault
70
-
100
4.0
120
20
mV
mV
Threshold Voltage)
Input Hysteresis Voltage
Power Stage
-
VCC = VC = 10 V; VFB = 1.2 V
VCOSC = 1.0V;200 mA Sink
GATE DC low Saturation Voltage
GATE DC High Saturation Voltage
Rise Time
-
-
-
-
1.2
1.5
25
1.5
2.1
60
V
V
VCOSC = 2.7V;200 mA Source; VC=VGATE
CGATE = 1.0 nF; 1.5 V < VGATE < 9.0 V
CGATE = 1.0 nF; 1.5 V < VGATE < 9.0 V
ns
ns
Fall Time
25
60
VCC Monitor
Turn-On Threshold
Turn-Off Threshold
Hysteresis
-
-
-
4.100
4.085
65
4.300
4.200
130
4.500
4.415
200
V
V
mV
Current Drain
ICC
4.5 V < VCC < 16 V, Gate switching
3.0 V < VC < 16 V, Gate Nonswitching
VCC = 4.0
4.5
2.7
500
6.0
4.0
900
mA
mA
A
IC
Shutdown ICC
3. Guaranteed by design, not 100% tested in production.
HTC
− 3 −
HTC [ HTC KOREA TAEJIN TECHNOLOGY CO. ]
