TB7101F(T5L1.2,F) , TB7101F(T5L1.5,F)

TB7101F(T5L1.8,F) , TB7101F(T5L2.5,F)

TB7101F(T5L3.3,F)

2007-09-06

10

Electrical Characteristics Common to All Products

When a pulse test is carried out, Tj = 25°C is the standard condition in the measurements for each item.

Any drift in the electrical characteristic due to a rise in the junction temperature of the chip may be disregarded.

Application Circuit Example

Figure 1: TB7101F application circuit example

Component constants

The following values are given only for your reference and may need tuning depending on your input/output conditions and board

layout.

(multilayer ceramic capacitor JMK212BJ106KG, manufactured by Taiyo Yuden Co., Ltd.)

(multilayer ceramic capacitor JMK212BJ106KG manufactured by Taiyo Yuden Co., Ltd.)

L: Inductor3.3

How to use

Setting the Inductance

The required inductance can be calculated by using the following equation:

IN

OUT

L

OSC

OUT

IN

V

V

I

f

V

V

L

⋅

Δ

⋅

−

=

… (1)

* Generally,

peak switch current [1.15 A (min)] of the TB7101F. If the current rating is exceeded, the inductor becomes

saturated, leading to an unstable DC-DC converter operation.

TB7101F(T5L*.*,F)

PGND

SGND

EN

GND

L

GND