LM3478MA_15 Datasheet, PDF (2/26 Pages) Texas Instruments – High-Efficiency Low-Side N-Channel Controller for Switching Regulator

LM3478MA
SNVS705B – FEBRUARY 2011 – REVISED FEBRUARY 2013
Connection Diagram
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Figure 2. 8-Lead SOIC Package
Pin Name
I_SEN
COMP
FB
AGND
PGND
DR
FA/SD
V_IN
Table 1. Pin Descriptions
Pin
Description
No.
1 Current sense input pin. Voltage generated across an external sense resistor is fed into this pin.
2 Compensation pin. A resistor, capacitor combination connected to this pin provides compensation for the control
loop.
3 Feedback pin. The output voltage should be adjusted using a resistor divider to provide 1.26V at this pin.
4 Analog ground pin.
5 Power ground pin.
6 Drive pin. The gate of the external MOSFET should be connected to this pin.
7 Frequency adjust and Shutdown pin. A resistor connected to this pin sets the oscillator frequency. A high level
on this pin for longer than 30 µs will turn the device off. The device will then draw less than 10µA from the
supply.
8 Power Supply Input pin.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
Absolute Maximum Ratings ⁽¹⁾
Input Voltage
45V
FB Pin Voltage
FA/SD Pin Voltage
Peak Driver Output Current (<10µs)
-0.4V < V_FB < 7V
-0.4V < V_FA/SD < 7V
1.0A
Power Dissipation
Internally Limited
Storage Temperature Range
−65°C to +150°C
Junction Temperature
ESD Susceptibility
Human Body Model ⁽²⁾
+150°C
2kV
Lead Temperature
Vapor Phase (60 sec.)
215°C
Infrared (15 sec.)
260°C
DR Pin Voltage
−0.4V ≤ VDR ≤ 8V
I_SEN Pin Voltage
500mV
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
(2) The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
Operating Ratings ⁽¹⁾
Supply Voltage
Junction Temperature Range
Switching Frequency
2.97V ≤ V_IN ≤ 40V
−40°C ≤ T_J ≤ +125°C
100kHz ≤ F_SW ≤ 1MHz
(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which
operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
2
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