LM5642MH NSC [National Semiconductor], LM5642MH Datasheet - Page 4

• Manufacturer Part Number: LM5642MH
• Description: High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization
• Manufacturer: NSC [National Semiconductor]

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System
ΔV
V
I
VLIN5
V
I
I
I
V
V
V
I
I
V
V
VIN
CL
ss_SC1
ss_SK1
sc_uvdelay
sk_uvdelay
FB1_FB2
CLos
ON_SS1
ON_SS2
SSTO
UVDelay
UVP
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Unless otherwise specified, V
the specified operating junction temperature range, (-40°C to +125°C, if not otherwise specified). Specifications appearing in plain
type are measured using low duty cycle pulse testing with T
test, or statistical analysis.
Voltages from the indicated pins to SGND/PGND:
VIN, ILIM1, ILIM2, KS1, KS2
SW1, SW2, RSNS1, RSNS2
FB1, FB2, VDD1, VDD2
SYNC, COMP1, COMP2, UV Delay
ON/SS1, ON/SS2 (Note 2)
CBOOT1, CBOOT2
CBOOT1 to SW1, CBOOT2 to SW2
LDRV1, LDRV2
HDRV1 to SW1, HDRV2 to SW2
HDRV1 to CBOOT1, HDRV2 to
CBOOT2
Symbol
OUT
, I
, I
/V
,
ss_SC2
ss_SK2
OUT
Load Regulation
Line Regulation
Feedback Voltage
Input Supply Current
VLIN5 Output Voltage
Current Limit Comparator
Offset (VILIMX −VRSNSX)
Current Limit Sink Current
Soft-Start Source Current
Soft-Start Sink Current
Soft-Start On Threshold
Soft-Start Timeout
Threshold
UV_DELAY Source
Current
UV_DELAY Sink Current
UV_DELAY Threshold
Voltage
FB1, FB2, Under Voltage
Protection Latch Threshold
Hysteresis
Parameter
IN
= 28V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply over
−0.3V to (VDD+0.3)
−0.3 to (V
VIN = 28V, V
5.5V
5.5V
-20°C to 85°C
V
5.5V
Shutdown (Note 8)
V
IVLIN5 = 0 to 25mA,
5.5V
V
V
V
(Note 9)
UV-DELAY = 2V
UV-DELAY = 0.4V
As a percentage of nominal output voltage
(falling edge)
ON_SSx
ON_SS1
IN
ON_ss1
ON_ss1
−0.3V to (VLIN5
−0.3V to (VLIN5
= 6V
−0.3V to 38V
≤
≤
≤
≤
(Note 1)
−0.3V to 6V
−0.3V to 7V
VIN
VIN
VIN
VIN
= V
= V
> 2V
= V
IN
+ 0.3)V
ON_ss2
ON_ss2
+0.3)V
+0.6)V
≤
≤
≤
≤
ON_SS2
−0.3V
+0.3V
compx
36V, V
36V
36V
36V
43V
Conditions
V
A
= 1.5V (on)
= 1.5V
= 0V
= 0.5V to 1.5V
= 25°C (Note 6), (Note 7). Min/Max limits are guaranteed by design,
compx
4
=1.25V
Operating Ratings
Power Dissipation (T
(Note 3)
Ambient Storage Temp. Range
Soldering Dwell Time, Temp.
(Note 4)
ESD Rating (Note 5)
VIN (VLIN5 tied to VIN)
VIN (VIN and VLIN5 separate)
Junction Temperature
TSSOP
eTSSOP
Wave
Infrared
Vapor Phase
1.2154
1.2179
4.70
Min
8.4
0.5
0.7
0.2
75
A
2
2
= 25°C),
1.2364
1.2364
(Note 1)
0.04
0.04
1.12
0.48
80.7
Typ
1.1
9.9
2.4
5.5
3.4
2.3
3.7
50
±2
5
5
1.2574
1.2549
−65°C to +150°C
−40°C to +125°C
±7.0
Max
5.30
11.4
110
2.0
5.0
1.4
1.2
10
86
9
10sec, 240°C
75sec, 219°C
4 sec, 260°C
4.5V to 5.5V
5.5V to 36V
1.1W
3.4W
Units
2kV
mA
mV
mA
µA
µA
µA
µA
µA
%
%
%
%
V
V
V
V
V