LM5642XMT/NOPB National Semiconductor, LM5642XMT/NOPB Datasheet - Page 4

• Manufacturer Part Number: LM5642XMT/NOPB
• Description: IC CONV SYNC DUAL BUCK 28-TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Step-Down (Buck)r

Specifications of LM5642XMT/NOPB

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 2
• Voltage - Output: 1.3 ~ 35 V
• Current - Output: 20A
• Frequency - Switching: 375kHz
• Voltage - Input: 4.5 ~ 36 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 28-TSSOP
• Power - Output: 1.1W
• For Use With: LM5642EVAL-KIT - BOARD EVALUATION LM5642
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM5642XMT; *LM5642XMT/NOPB; LM5642XMT

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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.
Symbol
OUT
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
CBOOT1, CBOOT2
CBOOT1 to SW1, CBOOT2
to SW2
LDRV1, LDRV2
HDRV1 to SW1, HDRV2 to
SW2
HDRV1 to CBOOT1, HDRV2
to CBOOT2
, 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
(Note
Parameter
2)
IN
= 28V, GND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply over
−0.3V to (VLIN5 +0.3)V
−0.3V to (VLIN5 +0.6)V
−0.3V to (VDD+0.3)V
−0.3 to (V
VIN = 28V, V
5.5V
5.5V
-20°C to 85°C
V
5.5V
Shutdown
V
IVLIN5 = 0 to 25mA,
5.5V
V
V
V
(Note
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 38V
= 6V
−0.3V to 6V
−0.3V to 7V
≤
≤
≤
≤
9)
(Note
IN
VIN
VIN
VIN
VIN
= V
= V
> 2V
= V
+ 0.3)V
−0.3V
+0.3V
(Note
ON_ss2
ON_ss2
≤
≤
≤
≤
ON_SS2
1)
43V
compx
36V, V
36V
36V
36V
Conditions
8)
A
= 1.5V (on)
= 1.5V
= 0V
= 0.5V to 1.5V
= 25°C
compx
4
=1.25V
Operating Ratings
(Note
VIN (VLIN5 tied to VIN)
VIN (VIN and VLIN5 separate)
Junction Temperature
Power Dissipation (T
C),
(Note
Ambient Storage Temp.
Range
Soldering Dwell Time, Temp.
ESD Rating
TSSOP
eTSSOP
(Note
6),
Wave
Infrared
Vapor Phase
3)
(Note
4)
(Note
7). Min/Max limits are guaranteed by design,
1.2154
1.2179
4.70
Min
8.4
0.5
0.7
0.2
5)
75
2
2
A
= 25°
1.2364
1.2364
(Note
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)
−65°C to +150°C
1.2574
1.2549
−40°C to +125°C
±7.0
Max
5.30
11.4
110
10sec, 240°C
75sec, 219°C
2.0
5.0
1.4
1.2
10
86
4 sec, 260°C
9
4.5V to 5.5V
5.5V to 36V
1.1W
3.4W
2kV
Units
mA
mV
mA
µA
µA
µA
µA
µA
%
%
%
%
V
V
V
V
V