MAX15158 datasheet(21/28 Pages) MAXIM

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Overvoltage Protection (OVP)

MAX15158/MAX15158A has an OVP comparator to

monitor the FB voltage. The device can be configured

to disable OVP or select OVP threshold of 110% by

connecting a resistor from the OVP pin to GND. FB OVP

is also disabled when the voltage on the SS pin is below

1V. Once OVP is enabled, the drivers start switching, and

voltage on the SS pin is higher than 1V, the FB overvoltage

comparator trips if the feedback voltage exceeds the SS

voltage by 110% for more than 128 PWM clock cycles. If

the overvoltage comparator is triggered, the controller pulls

PGOOD low, discharges the SS capacitor and disables

the drivers. The controller immediately restarts once the

fault condition has been removed. When OVP is disabled,

the PGOOD will remain high when FB voltage is higher

than the reference voltage.

The resistor from OVP pin to GND is also used to enable

or disable the FB level shifter and select single or dual

phase operation. Refer to the Table 1.

Thermal Shutdown (TSHDN)

The controller features a thermal fault-protection circuit.

When the junction temperature rises above +165°C,

the internal thermal sensor triggers the fault protection,

disables the drivers, and discharges the SS capacitor.

The controller remains disabled until the junction

temperature cools by 15°C. Once the device has cooled

down the controller automatically restarts using the

soft-start sequence.

Switching Frequency (FREQ/CLK)

The controller supports 120kHz to 1MHz switching

frequencies. Leave FREQ/CLK unconnected to select

the preset 300kHz switching frequency. To adjust the

switching frequency, either place an external resistor from

FREQ/CLK to AGND, or drive FREQ/CLK with an external

system clock (see Table 2). The resistively programmable

switching frequency is determined by:

Table 2. Phase and Master/Slave Configurations

Table 1. FB OVP Settings, Phase and FB Level Shifter Configuration

NUMBER OF PHASES

NUMBER OF

MAX15158/MAX15158A

FB OF SLAVE

CONNECTED TO BIAS

CLK FREQUENCY

N/A

4 x fSW

N/A

4 x fSW

Yes

4 x fSW

OVP PIN VOLTAGE (V)

ROVP

FB OVP THRESHOLD

FB LEVEL SHIFTER

PHASE CONFIGURATION

0.10 ± 0.05

GND

110%

DISABLED

Dual-phase or

quad-phase operations

0.33 ± 0.05

33kΩ

DISABLED

ENABLED

0.68 ± 0.05

68kΩ

110%

ENABLED

1.00 ± 0.05

100kΩ

DISABLED

1.33 ± 0.05

133kΩ

DISABLED

ENABLED

Single-phase operation

1.69 ± 0.05

169kΩ

110%

ENABLED

2.05 ± 0.05

205kΩ

DISABLED

2.53 ± 0.05

OPEN

110%

DISABLED

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MAX15158/MAX15158A

High-Voltage Multiphase Boost Controller

MAX15158 Datasheet(PDF) 21 Page - Maxim Integrated Products

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