LM20343MH/NOPB National Semiconductor, LM20343MH/NOPB Datasheet - Page 4

• Manufacturer Part Number: LM20343MH/NOPB
• Description: IC REG SYNC BUCK 3A 20TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Step-Down (Buck)r

Specifications of LM20343MH/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 32 V
• Current - Output: 3A
• Frequency - Switching: 250kHz, 750kHz
• Voltage - Input: 4.5 ~ 36 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Primary Input Voltage: 36V
• No. Of Outputs: 1
• Output Voltage: 32V
• Output Current: 3A
• No. Of Pins: 20
• Operating Temperature Range: -40°C To +125°C
• Msl: MSL 1 - Unlimited
• Filter Terminals: SMD
• Rohs Compliant: Yes
• For Use With: LM20343EVAL - EVALUATION BOARD FOR THE LM20343
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Other names: *LM20343MH; *LM20343MH/NOPB; LM20343MH

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Current Limit
Enable
Thermal Shutdown
Thermal Resistance
Note 1: Absolute Maximum Ratings indicate limits beyond witch damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 kΩ resistor to each pin.
Note 3: Measured on a 4 layer 2" x 2" PCB with 1 oz. copper weight inner layers and 2 oz. outer layers.
Typical Performance Characteristics
f
V
SW
V
Symbol
T
EN(RISING)
I
LIMNEG
EN(HYS)
SD(HYS)
T
=750kHz, C
T
I
θ
I
θ
LIM
ILIM
EN
SD
JC
JA
Parameter
Cycle By Cycle Positive Current Limit
Cycle By Cycle Negative Current Limit
Cycle By Cycle Current Limit Delay
EN Pin Rising Threshold
EN Pin Hysteresis
EN Source Current
Thermal Shutdown
Thermal Shutdown Hysteresis
Junction to Case
Junction to Ambient (Note 3)
SS
= 100nF, T
Efficiency vs. Load Current
f
SW
A
= 350 kHz
= 25°C for efficiency curves, loop gain plots and waveforms, and T
30051703
4
Unless otherwise specified: V
Conditions
V
0 LFM airflow
EN
= 0V, V
VIN
= 12V
Efficiency vs. Load Current
f
SW
= 500 kHz
VIN
J
= 12V, V
= 25°C for all others.
Min
4.3
1.2
OUT
1.25
Typ
150
170
5.2
2.8
5.6
= 3.3V, L= 4.7µH,
50
20
27
2
30051704
Max
6.0
1.3
Units
°C/W
°C/W
mV
µA
°C
°C
ns
A
A
V