TLE8386-2EL Datasheet, PDF (18/32 Pages) Infineon Technologies AG – Basic Smart Boost Controller

TLE8386-2EL
Linear Regulator
8
Linear Regulator
8.1
Description
The internal linear voltage regulator supplies the internal gate drivers with a typical voltage of 5 V and current up
to 50 mA. An external output capacitor with low ESR is required on pin IVCC for stability and buffering transient
load currents. During normal operation the external boost MOSFET switch will draw transient currents from the
linear regulator and its output capacitor. Proper sizing of the output capacitor must be considered to supply
sufficient peak current to the gate of the external MOSFET switch. Please refer to application section for
recommendations on sizing the output capacitor. An integrated power-on reset circuit monitors the linear regulator
output voltage and resets the device in case the output voltage falls below the power-on reset threshold. The
power-on reset helps protect the external switches from excessive power dissipation by ensuring the gate drive
voltage is sufficient to enhance the gate of an external logic level n-channel MOSFET.
IVCC stays at around 300 mV when Enable signal is off. No external circuit should be connected to IVCC
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8.2
Electrical Characteristics
V_IN = 6V to 40V; T_j = -40 °C to +150 °C, all voltages with respect to ground, positive current flowing into pin; (unless
otherwise specified)
Pos. Parameter
Symbol
Limit Values
Unit Conditions
Min. Typ. Max.
8.2.1 Output Voltage
V_IVCC
4.6
5
5.4
V
6 V ≤ V_IN ≤ 45 V
0.1 mA ≤ I_IVCC ≤ 50 mA
8.2.2 Output Current Limitation
8.2.3
8.2.4
Drop out Voltage
Output Capacitor
I_LIM
V_DR
C_IVCC
51
0.47
110 mA V_IN = 13.5 V
V_IVCC = 4.5V
1000 mV I_IVCC = 50mA ¹⁾
3
µF ²⁾
8.2.5 Output Capacitor ESR
R_IVCC,ESR
0.5
Ω f = 10kHz
8.2.6 Undervoltage Reset Headroom V_IVCC,HDRM 100
–
–
mV V_IVCC decreasing
V_IVCC - V_IVCC,RTH,d
8.2.7 Undervoltage Reset Threshold V_IVCC,RTH,d 4.0
–
–
V
V_IVCC decreasing
8.2.8 Undervoltage Reset Threshold V_IVCC,RTH,i –
–
4.5
V
V_IVCC increasing
1) Measured when the output voltage V_CC has dropped 100 mV from its nominal value.
2) Minimum value given is needed for regulator stability; application might need higher capacitance than the minimum.
Data Sheet
16
Rev. 1.0, 2010-10-25