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MAX8930
WLED Charge Pump, RGB, OLED Boost,
LDOs with ALC and CAI
Table 6. Recommended Capacitors
DESIGNATION
C PV3
C PV4
(in case of external supply)
C LDO1
C LDO2
C LDO3
VALUE
(μF)
2.2
2.2
1
1
2.2
MANUFACTURER
TDK
TDK
TDK
TDK
TDK
PART NUMBER
C2012X5R0J225M
C2012X5R0J225M
C1005X5R0J105M
C1005X5R0J105M
C1005X5R0J225M
DESCRIPTION
2.2 F F Q 20%, 6.3V X5R ceramic capacitor
2.2 F F Q 20%, 6.3V X5R ceramic capacitor
1 F F Q 20%, 6.3V X5R ceramic capacitor
1 F F Q 20%, 6.3V X5R ceramic capacitor
2.2 F F Q 20%, 6.3V X5R ceramic capacitor
response. Connect C LDO as close as possible to the
MAX8930 to minimize the impact of PCB trace inductance.
Step-Up DC-DC Converter Operation
The step-up DC-DC converter operates from a 2.7V to
5.5V supply. The MAX8930 includes an internal high-
voltage nMOSFET switch with low on-resistance and
a synchronous rectifier to reduce losses and achieve
higher efficiency. A true-shutdown feature disconnects
the battery from the load and reduces the supply current
to 0.05 F A. This DC-DC converter provides adjustable
output voltage from 13.0V to 16.5V with 0.5V steps. The
adjustment bits are located in the 04h register.
Control Scheme
The step-up DC-DC features a minimum off-time, cur-
rent-limited control scheme operating in discontinuous
conduction mode. An internal p-channel MOSFET switch
connects PV5 to SW to provide power to the inductor
when the converter is operating. When the converter is
shut down, this switch disconnects the input supply from
the inductor. To boost the output voltage, an n-channel
MOSFET switch turns on and allows the inductor current
to ramp up to the current limit. Once the inductor cur-
rent reaches the current limit, the switch turns off and
the inductor current flows through synchronous recti-
fier (pMOS) to supply the output voltage. The switching
Table 7. Protection Features
frequency varies depending on the load and input and
output voltage and can be up to 750kHz.
Setting the Output Voltage
The output voltage of the step-up converter is set by bit,
boost1 to boost3, in Register 04h. The output voltage
can be adjusted from 13.0V to 16.5V in 0.5V increments.
Shutdown
If Bit 6, SUEN, in Register 00h is set to 0, the step-up
converter enters shutdown. During shutdown, the output
is disconnected from the input, and LX enters a high-
impedance state. The capacitance and load at the out-
put determine the rate at which V OUT decays.
Soft-Start
The step-up converter uses two soft-start mechanisms.
When the true-shutdown feature is used, the gate of the
internal synchronous turns on slowly to prevent inrush
current. This takes approximately 0.04ms (typ). When
SW is fully turned on, the internal n-channel switch
begins boosting the input to set the output voltage.
Protection Features
The step-up converter has protection features designed
to make it extremely robust to application errors. If the
output capacitor in the application is missing, the con-
verter protects the internal switch from being damaged.
APPLICATION FAULTS
Output Shorted to Ground
Output Capacitor Missing
Maxim Integrated
PROTECTION
True off-switch detects short, opens when current reaches the synchronous rectifier current limit,
and restarts soft-start. This protects the inductor and the synchronous rectifier.
LX may boost one or two times before the internal FB voltage exceeds the trip point. In the rare
case where the capacitive loading and external loading on OUT is small enough that the energy
in one cycle can slew it more than 22V, the internal OVP operates at the typical threshold value,
18.5V.
31
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