STOD03A STMicroelectronics, STOD03A Datasheet - Page 17

• Manufacturer Part Number: STOD03A
• Description: Dual DC-DC converter for powering AMOLED display
• Manufacturer: STMicroelectronics

Specifications of STOD03A

• Typical Efficiency: 85%
• Low Quiescent Current: < 1 μA in shutdown mode
• Temperature Range: - 40 °C to 85 °C

STOD03A
8.1.2
8.1.3
8.1.4
8.1.5
8.1.6
Enable pin
The device operates when the EN pin is set high. If the EN pin is set low, the device stops
switching, and all the internal blocks are turned off. In this condition the current drawn from
V
are in an OFF state so the load is electrically disconnected from the input, this avoids
unwanted current leakage from the input to the load.
When the EN is pulled high, the P1B switch is turned on for 100 µs. In normal operation,
during this time, apart from a small drop due to parasitic resistance, V
If, after this 100 µs, V
pulse is applied to the EN. This mechanism avoids STOD03A starting if a short-circuit is
present on V
Soft-start and inrush current limiting
After the EN pin is pulled high, or after a suitable voltage is applied to V
the device initiates the startup phase.
As a first step, the C
limiting technique in order to keep the charge current below 400 mA. This avoids the battery
overloading during startup.
After V
procedure for the step-up is started. After about 2 ms the soft-start for the inverting is
started. The positive and negative voltage is under regulation by around 6 ms after the EN
pin is asserted high.
Undervoltage lockout
The undervoltage lockout function avoids improper operation of STOD03A when the input
voltage is not high enough. When the input voltage is below the UVLO threshold the device
is in shutdown mode. The hysteresis of 50 mV avoids unstable operation when the input
voltage is close to the UVLO threshold.
Overtemperature protection
An internal temperature sensor continuously monitors the IC junction temperature.
If the IC temperature exceeds 140 °C, typical, the device stops operating. As soon as the
temperature falls below 125 °C, typical, normal operation is restored.
Fast discharge
When ENABLE turns from high to low level, the device goes into shutdown mode and LX1
and LX2 stop switching. Then, the discharge switch between V
between V
output voltage. When the output voltages are discharged to 0 V, the switches turn off and the
outputs are high impedance.
INP
/V
INA
MID
is below 1 µA in the whole temperature range. In addition, the internal switches
O2
reaches V
MID
and GND turn on and discharge the positive output voltage and negative
.
MID
INP
MID
capacitor is charged and the P1B switch implements a current
voltage level, the P1B switch is fully turned on and the soft-start
stays below V
Doc ID 17785 Rev 2
IN
, the P1B is turned off and stays off until a new
MID
and V
MID
Detailed description
INP
IN
reaches V
, V
and the switch
INA
, and EN,
IN
.
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