lm25117psqx National Semiconductor Corporation, lm25117psqx Datasheet - Page 6

• Manufacturer Part Number: lm25117psqx
• Description: Wide Input Range Synchronous Buck Controller With Analog Current Monitor
• Manufacturer: National Semiconductor Corporation

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Oscillator
Current Limit
RES
Diode Emulation
Current Monitor
HO Gate Driver
LO Gate Driver
Switching Characteristics
Thermal
Symbol
t
V
ON(MIN)
V
V
V
V
V
T
f
f
I
CS(TH)
I
I
I
I
T
SW1
SW2
V
V
OHH
θ
RES
OLH
OHL
OLL
OHH
RES
OLH
OHL
DLH
OLL
SD
JA
IH
IL
Parameter
Minimum HO On-time
COMP to PWM comparator offset
Frequency 1
Frequency 2
RT Output Voltage
RT Sync Positive Threshold
Sync Pulse Width
Cycle-by-cycle Sense Voltage
Threshold
CS Input Bias Current
CSG Input Bias Current
Current Sense Amplifier Gain
Hiccup Mode Fault Timer
RES Current Source
RES Threshold
DEMB Input Low Threshold
DEMB Input High Threshold
SW Zero Cross Threshold
DEMB Input Pull-down Resistance
Current Monitor Amplifier Gain
Zero Input Offset
HO High-state Voltage Drop
HO Low-state Voltage Drop
HO Rise Time
HO Fall Time
Peak HO Source Current
Peak HO Sink Current
HB to SW Under-voltage
HB DC Bias Current
LO High-state Voltage Drop
LO Low-state Voltage Drop
LO Rise Time
LO Fall Time
Peak LO Source Current
Peak LO Sink Current
LO Fall to HO Rise Delay
HO Fall to LO Rise Delay
Thermal Shutdown
Thermal Shutdown Hysteresis
Junction to Ambient
Conditions
V
R
R
V
V
V
RES Rising
CS to CM
I
I
C-load = 1000pF
C-load = 1000pF
V
V
HB - SW = 7.6V
I
I
C-load = 1000pF
C-load = 1000pF
V
V
No load
No load
Temperature Rising
TSSOP-20EP
HO
HO
LO
LO
VIN
RAMP
CS
CSG
HO
HO
LO
LO
T
T
= 25kΩ
= 10kΩ
= –100mA, V
= 100mA, V
= –100mA, V
= 100mA, V
= 0V
= 7.6V
= 0V
= 0V, SW = 0V, HB = 7.6V
= V
= 42V
= 0V
= 0, CSG to CS
HB
= 7.6V
6
OLL
OLH
OHL
OHH
(Note
(Note
(Note
(Note
= V
= V
= V
= V
LO
HO
7)
7)
7)
7)
CC
HB
- V
-V
- V
LO
SW
HO
-100
-100
1.22
2.95
17.5
2.56
Min
180
430
100
106
2.6
1.25
1.25
20.5
0.17
0.17
Typ
100
200
480
120
256
165
1.2
3.2
-66
-66
2.0
2.5
0.1
2.2
3.3
2.9
0.1
2.5
3.3
10
10
50
25
65
72
71
25
40
-5
6
5
6
5
1.285
Max
3.95
1.65
23.5
3.32
0.27
220
530
135
120
100
0.3
0.2
0.2
Cycles
Units
°C/W
kHz
kHz
V/V
V/V
mV
mV
mV
kΩ
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
ns
°C
°C
V
V
V
V
V
V
V
V
A
A
V
V
V
A
A