Specifications

LV5692P, LV5693P Application Note
http://onsemi.com
27
Functional Description
The LV5693P is a multiple output voltage
regulator with a power switch, suitable for use
in car audio system.
[Standby mode]
When all CTRL pins are "L" state
(CTRL1=CTRL2=CTRL3=L), LV5692P/93P is
in standby mode. In standby mode, all outputs
except VDD are disabled. Quiescent current is
50uA(typ) at VDD no load. When either CTRL
pin exceeds "M1" threshold voltage, LV5693P
exits standby mode.
[VCC]
This IC has the tolerance value of 50V against
VCC peak surge voltage, but for more safety
set design, adding power clamp, such as
power zenner diode, on battery connected line
is recommended in order to absorb applied
surge.
This IC has no protection against battery
reverse connection, so adding Schottky diode
is recommended to prevent a negative
voltage.
[Linear Regulators]
All regulators in LV5692P/93P are low dropout
outputs, because the output stage of all
regulators is Pch-LDMOS.
When you select output capacitors for linear
regulators, you should consider three main
characteristics: startup delay, transient
response and loop stability. The capacitor
values and type should be based on cost,
availability, size and temperature constraints.
Tantalum, Aluminum electrolytic, Film, or
Ceramic capacitors are all acceptable
solutions. However, attention must be paid to
ESR constraints. The aluminum electrolytic
capacitor is the least expensive solution, but if
the circuit operates at low temperatures(-25 to
-40 ℃ ), both the value and ESR of the
capacitor will vary considerably. The capacitor
manufacturer's datasheet usually provides
this information.
VDD5V regulator (3.3V, 0.3A:LV5692P)
(5.7V, 0.3A:LV5693P)
When VCC is applied, VDD output is active
regardless of CTRL states.
The charge on VCC1 capacitor can be used to
supply VDD output for a short period when
VCC voltage drops 0V.
CD regulator (8.0V, 1.3A)
AUDIO regulator (8.4V, 0.5A)
ILM regulator (8.4V, 0.5A)
DSP regulator (3.3V, 0.3A)
These regulators are controled by CTRL1/2
pins. Logic table is shown on page7.
USB regulator (5V, 1.0A)
USB output is controled by CTRL3 pin.
USBGT(PIN10) is gate drive terminal of
P-channel FET.
FB(PIN9) is feedback input.
RSNS(PIN12) is current sense input. When
voltage difference (VCC-RSNS) exceeds 0.3V,
current limits output current and foldback
output voltage.Limit current is determined by
following equation.
Io_lim(A)=0.3V/R3(ohm)
For maximum accuracy, VCC and RSNS pins
must be Kelvin connected to R3, to aviod
errors caused by voltage drops along the
traces carrying the current from the VCC to the
Source pin of the FET.
For more information about USB application,
refer to "How to set USB application" on
page22.
[EXT high-side switches]
These are high-side power switches
connected to VCC.
If these output are connected to inductive load
or loads which have different ground potential,
protection diodes (D2/D3) are necessary to
protect the device from negative voltage.
[over current protection]
When the each output becomes in over load
conditon, the device limits the output
current.All outputs are also protected against
short circuit by fold back current limitter.