LM3102MH/NOPB National Semiconductor, LM3102MH/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM3102MH/NOPB
• Description: IC BUCK SYNC ADJ 2.5A 20TSSOP
• Manufacturer: National Semiconductor
• Series: PowerWise®, SIMPLE SWITCHER®r
• Type: Step-Down (Buck)r

Specifications of LM3102MH/NOPB

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 7 V
• Current - Output: 2.5A
• Frequency - Switching: 1MHz
• Voltage - Input: 4.5 ~ 42 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Current, Output: 2.5 A
• Current, Supply: 0.7 mA
• Frequency, Oscillator: 1 MHz
• Package Type: eTSSOP
• Regulator Type: Buck (Step-Down)
• Resistance, Thermal, Junction To Case: 6.5 °C/W
• Temperature, Operating, Range: -40 to +125 °C
• Voltage, Dropout: 350 mV
• Voltage, Input: 4.5 to 42 V
• Voltage, Output: 0.8 to 38 V
• Dc To Dc Converter Type: Step Down
• Pin Count: 20
• Input Voltage: 42V
• Output Voltage: 0.8 to 7V
• Switching Freq: 1000KHz
• Output Current: 2.5A
• Efficiency: 92%
• Output Type: Adjustable
• Switching Regulator: Yes
• Mounting: Surface Mount
• Input Voltage (min): 4.5V
• Operating Temp Range: -40C to 125C
• Operating Temperature Classification: Automotive
• For Use With: LM3102EVAL - BOARD EVALUATION LM3102
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Power - Output: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device
• Other names: *LM3102MH; *LM3102MH/NOPB; LM3102MH

Pin Descriptions
1,9,10,12,19,
17, 18
2, 3
4, 5
Pin
EP
20
11
13
14
15
16
6
7
8
B3, C2, C3,
A1, B1, C1,
A2, A3, B2,
D2, D3, D4
E3, E4, F1,
F2, F3, G3
A4, B4
E1, E2
Ball
C4
G2
G1
G4
D1
F4
AGND
PGND
Name
GND
RON
VCC
BST
N/C
VIN
SW
EN
SS
FB
EP
Description
No Connection
Switching Node
Input supply voltage
Connection for bootstrap
capacitor
Analog Ground
Soft-start
Ground
Feedback
Enable pin
On-time Control
Start-up regulator Output
Power Ground
Exposed Pad
3
Application Information
These pins must be left unconnected.
Internally connected to the source of the main
MOSFET and the drain of the Synchronous
MOSFET. Connect to the inductor.
Supply pin to the device. Nominal input range is
4.5V to 42V.
Connect a 33 nF capacitor from the SW pin to
this pin. An internal diode charges the capacitor
during the main MOSFET off-time.
Ground for all internal circuitry other than the
PGND pin.
An 8 µA internal current source charges an
external capacitor to provide the soft- start
function.
Must be connected to the AGND pin for normal
operation. The GND and AGND pins are not
internally connected.
Internally connected to the regulation and over-
voltage comparators. The regulation setting is
0.8V at this pin. Connect to feedback resistors.
Connect a voltage higher than 1.26V to enable
the regulator.
An external resistor from the VIN pin to this pin
sets the main MOSFET on-time.
Nominally regulated to 6V. Connect a capacitor
of not less than 680 nF between the VCC and
AGND pins for stable operation.
Synchronous MOSFET source connection. Tie
to a ground plane.
Thermal connection pad. Connect to the ground
plane.
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