LM3475_14 Datasheet, PDF (3/21 Pages) Texas Instruments – Hysteretic PFET Buck Controller

LM3475
www.ti.com
SNVS239A – OCTOBER 2004 – REVISED JANUARY 2005
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⁾⁽²⁾
V_IN
PGATE
FB
EN
Storage Temperature
Power Dissipation ⁽³⁾
ESD Susceptibilty
Human Body Model ⁽⁴⁾
Lead Temperature
Vapor Phase (60 sec.)
Infared (15 sec.)
−0.3V to 16V
−0.3V to 16V
−0.3V to 5V
−0.3V to 16V
−65°C to 150°C
440mW
2.5kV
215°C
220°C
(1) Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the
device is intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test
conditions, see the Electrical Characteristics.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, T_{J_MAX}, the junction-to-ambient thermal
resistance, θ_JA and the ambient temperature, T_A. The maximum allowable power dissipation at any ambient temperature is calculated
using:P_{D_MAX} = (T_{J_MAX} - T_A)/θ_JA. The maximum power dissipation of 0.44W is determined using T_A = 25°C, θ_JA = 225°C/W, and T_{J_MAX}
= 125°C.
(4) The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
Operating Ratings ⁽¹⁾
Supply Voltage
Operating Junction Temperature
2.7V to 10V
−40°C to +125°C
(1) Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the
device is intended to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test
conditions, see the Electrical Characteristics.
Electrical Characteristics
Specifications in Standard type face are for T_J = 25°C, and in bold type face apply over the full Operating Temperature
Range (T_J = −40°C to +125°C). Unless otherwise specified, V_IN = EN = 5.0V. Datasheet min/max specification limits are
guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
I_Q
Quiescent Current
EN = V_IN (PGATE Open)
170
260
320
µA
EN = 0V
4
7
10
V_FB
%ΔV_FB/ΔV_IN
Feedback Voltage
Feedback Voltage Line
Regulation
2.7V < V_IN < 10V
0.788
0.8
0.812
V
0.01
%/V
V_HYST
Comparator Hysteresis
2.7V < V_IN < 10V
−40°C to +125°C
21
21
28
32
mV
I_FB
Vth_EN
FB Bias Current
Enable Threshold Voltage
Hysteresis
Increasing
50
600
nA
1.2
1.5
1.8
V
365
mV
I_EN
R_PGATE
Enable Leakage Current
Driver Resistance
EN = 10V
Source
I_SOURCE = 100mA
Sink
I_Sink = 100mA
.025
1
µA
2.8
Ω
1.8
Copyright © 2004–2005, Texas Instruments Incorporated
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