LM5116MH/NOPB National Semiconductor, LM5116MH/NOPB Datasheet - Page 2

• Manufacturer Part Number: LM5116MH/NOPB
• Description: IC CTRLR SYNCH BUCK 20-TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®r
• Type: Step-Down (Buck)r

Specifications of LM5116MH/NOPB

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 1.22 ~ 80 V
• Current - Output: 20A
• Frequency - Switching: 50kHz ~ 1MHz
• Voltage - Input: 6 ~ 100 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Dc To Dc Converter Type: Synchronous Buck Controller
• Pin Count: 20
• Input Voltage: 6 to 100V
• Output Voltage: 1.215 to 80V
• Output Current: 3.5A
• Package Type: TSSOP EP
• Mounting: Surface Mount
• Operating Temperature Classification: Automotive
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• For Use With: LM5116-12EVAL - BOARD EVALUATION FOR LM5116-12LM5116EVAL - BOARD EVALUATION LM5116
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: Compliant
• Other names: LM5116MH

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LM5116MH
LM5116MHX
Pin
10
11
Connection Diagram
Ordering Information
Pin Descriptions
1
2
3
4
5
6
7
8
9
Ordering Number
COMP
RAMP
AGND
DEMB
Name
UVLO
SYNC
VOUT
VIN
RT/
EN
SS
FB
Description
Chip supply voltage, input voltage monitor and input to the VCC regulator.
If the UVLO pin is below 1.215V, the regulator will be in standby mode (VCC regulator running, switching regulator
disabled). If the UVLO pin voltage is above 1.215V, the regulator is operational. An external voltage divider can be
used to set an under-voltage shutdown threshold. There is a fixed 5µA pull up current on this pin when EN is high.
UVLO is pulled to ground in the event a current limit condition exists for 256 clock cycles.
The internal oscillator is set with a single resistor between this pin and the AGND pin. The recommended frequency
range is 50kHz to 1MHz. The internal oscillator can be synchronized to an external clock by AC coupling a positive
edge onto this node.
If the EN pin is below 0.5V, the regulator will be in a low power state drawing less than 10µA from VIN. EN must be
pulled above 3.3V for normal operation.
Ramp control signal. An external capacitor connected between this pin and the AGND pin sets the ramp slope used
for current mode control.
Analog ground.Connect to PGND through the exposed pad ground connection under the LM5116.
An external capacitor and an internal 10µA current source set the soft start time constant for the rise of the error amp
reference. The SS pin is held low during VCC < 4.5V, UVLO < 1.215V, EN input low or thermal shutdown.
Feedback signal from the regulated output. This pin is connected to the inverting input of the internal error amplifier.
The regulation threshold is 1.215V.
Output of the internal error amplifier. The loop compensation network should be connected between this pin and the
FB pin.
Output monitor. Connect directly to the output voltage.
Low-side MOSFET source voltage monitor for diode emulation. For start-up into a pre-biased load, tie this pin to
ground at the CSG connection. For fully synchronous operation, use an external series resistor between DEMB and
ground to raise the diode emulation threshold above the low-side SW on-voltage.
Package Type
TSSOP-20EP
TSSOP-20EP
See NS Package Number MXA20A
NSC Package Drawing
Top View
2
MXA20A
MXA20A
30007502
2500 units shipped as Tape & Reel
73 Units Per Anti-Static Tube
Supplied As