3

UVLO

1. 22 V

2. 9µ A

1µ A

4

PDIM

6

7

8

ISENSE

IADJ

Error

Amplifier

COMP

S

Slope

Compensation

+

-

1

2

9

10

GND

PH

BOOT

VIN

BOOT

Charge

BOOT

UVLO

Logic and

PWM Latch

Oscillator

with PLL

VIN

UVLO

Thermal

Shutdown

Shutdown

Logic

Current

Sense

PWM

Comparator

5

RT / CLK

S

R

R

R

Q

COMP

Clamp

1 .34 V

+

+

+

+

COMP S / H

1/6

1µ A

10k

1.8V

TPS92512, TPS92512HV

www.ti.com

SLVSCT1B – FEBRUARY 2015 – REVISED APRIL 2015

8 Detailed Description

8.1 Overview

The TPS92512 is a high voltage, up to 2.5-A, step-down (buck) regulator with an integrated high-side N-channel

MOSFET. To improve performance during line and load transients the device implements a constant frequency,

peak-current mode control which reduces output capacitance and simplifies external frequency compensation

design. The wide switching frequency of 100 kHz to 2000 kHz allows for efficiency and size optimization when

selecting the output filter components.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Undervoltage Lockout and Low Power Shutdown (UVLO Pin)

The TPS92512 contains an internal under-voltage lockout circuit on the VIN pin of the device. However, this

internal UVLO is for device protection only and does not contain hysteresis. The UVLO pin of the device should

always be used to set the minimum VIN voltage that the circuit operates at. This level should be set using the

minimum input voltage expected for the application with a minimum setting of 4.5 V.

The UVLO pin has an internal pull-up current source of 1 µA (I1) that will provide a default ON state in the event

additional 2.9 µA of hysteresis current is added (see Figure 11). This additional current provides the input voltage

discharged.

Copyright © 2015, Texas Instruments Incorporated

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Product Folder Links: TPS92512 TPS92512HV