TCV7101F datasheet(2/18 Pages) TOSHIBA

2 / 18 page

TCV7101F

2011-10-27

Ordering Information

Part Number

Shipping

TCV7101F (TE12L, Q)

Embossed tape (3000 units per reel)

Block Diagram

Pin Description

Pin No.

Symbol

Description

VIN1

Input pin for the output section

This pin is placed in the standby state if VEN = low. Standby current is 10 μA or less.

VIN2

Input pin for the control section

This pin is placed in the standby state if VEN = low. Standby current is 10 μA or less.

Soft-start pin

When the SS input is left open, the soft-start time is 1 ms (typ.). The soft-start time can be adjusted

with an external capacitor. The external capacitor is charged from a 8 μA (typ.) constant-current

source, and the reference voltage of the error amplifier is regulated between 0 V and 0.8 V. The

external capacitor is discharged when EN = low and in case of undervoltage lockout or thermal

shutdown.

GND

Ground pin

VFB

Feedback pin

This input is fed into an internal error amplifier with a reference voltage of 0.8 V (typ.).

Enable pin

When EN ≥ 1.5 V (@ VIN = 5 V), the internal circuitry is allowed to operate and thus enable the

switching operation of the output section. When EN ≤ 0.5 V (@ VIN = 5 V), the internal circuitry is

disabled, putting the TCV7101F in Standby mode.

This pin has an internal pull-down resistor of approx. 500 kΩ.

LSG

Gate drive pin for the low-side switch

Switch pin

This pin is connected to high-side P-channel MOSFET.

Control logic

Current detection

VIN1

LSG

Slope

compensation

ジ

Under

voltage

lockout

VIN2

Constant-current

source (8 μA)

GND

Phase compensation

Soft start

Error amplifier

Ref. voltage (0.8 V)

VFB

Short-Circuit

protection

Driver

Oscillator

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