TPS62361BYZHT datasheet(25/52 Pages) TI

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Output

Voltage

time

OUT,A

OUT,B

OUT

10 mV

10 mV/Ramp Rate

(TPS62360 / TPS62362)

Output

Voltage

time

OUT,A

OUT,B

OUT

20 mV

20 mV/Ramp Rate

(TPS62361B)

Output

Voltage

time

OUT,A

OUT,B

OUT

10 mV

10 mV/Ramp Rate

Output

Voltage

time

OUT,A

OUT,B

OUT

20 mV

20 mV/Ramp Rate

(TPS62360 / TPS62362)

(TPS62361B)

TPS62360, TPS62361B, TPS62362

www.ti.com

SLVSAU9A

– MAY 2011 – REVISED AUGUST 2011

If the RAMP_PFM bit is not set in Power Save Mode, the slope can be less at low output currents since the

device does not actively source energy back from the output capacitor to the input or it might be sharper at high

output currents since the output capacitor is discharged quickly.

Figure 38. Ramp Up

Figure 39. Ramp Down

The TPS62360 and TPS62362 ramp the output voltage taking 10mV steps, while the TPS62361B ramps taking

20mV steps with a final 10mV step if required. The resulting slope remains equal for both devices.

While the output voltage setpoint is changed in a digital stair step fashion, the connected output capacitor flattens

the steps to create a linear change in the output voltage.

SAFE OPERATION AND PROTECTION FEATURES

Inductor Current Limit

The inductor current limiting prevents the device from drawing high inductor current and excessive current from

the battery. Excessive current might occur with a shorted/saturated inductor or a heavy load/shorted output

circuit condition.

The incorporated inductor peak current limit measures the current while the high side power MOSFET is turned

on. Once the current limit is tripped, the high side MOSFET is turned off and the low side MOSFET is turned on

to ramp down the inductor current. This prevents high currents to be drawn from the battery.

Once the low side MOSFET is on, the low side forward current limit keeps the low side MOSFET on until the

current through it decreases below the low side forward current limit threshold.

The negative current limit acts if current is flowing back to the battery from the output. It works differently in PWM

and PFM operation. In PWM operation, the negative current limit prevents excessive current from flowing back

through the inductor to the battery, preventing abnormal voltage conditions at the switching node. In PFM

operation, a zero current limits any power flow back to the battery by preventing negative inductor current.

Die Temperature Monitoring and Over Temperature Protection

The TPS6236x offers two stages of die temperature monitoring and protection.

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Product Folder Link(s): TPS62360 TPS62361B TPS62362

TPS62361BYZHT Datasheet(PDF) 25 Page - Texas Instruments

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