tb7107fn TOSHIBA Semiconductor CORPORATION, tb7107fn Datasheet - Page 2

• Manufacturer Part Number: tb7107fn
• Description: Buck Dc-dc Converter Ic
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Ordering Information
Block Diagram
Pin Description
TB7107FN (TE85L, F)
V
Pin No.
SS
EN
FB
Part Number
1
2
3
4
5
6
7
8
Start
Soft
Symbol
COMP
BOOT
GND
V
V
EN
SS
L
Constant-current
source (5 μA)
FB
IN
X
Oscillator
Embossed tape (3000 units per reel)
voltage
lockout
Under
Error Amplifier
Bootstrap pin
This pin is connected to Bootstrap capacitor. A 0.1 μF bootstrap capacitor is required between
BOOT pin and L
Input pin
This pin is placed in the standby state if EN = low. Standby current is 60 μA (@V
Switch pin
This pin is connected to high-side N-channel MOSFET.
Ground pin
Feedback pin
This input is fed into an internal error amplifier with a reference voltage of 0.8 V (typ.).
Phase compensation pin
Pin for connecting an error amplifier phase compensation resistor and capacitor.
Enable pin
When V
the switching operation of the output section. When V
circuitry is disabled, putting the TB7107FN in Standby mode.
This pin has an internal pull-up current of 15 µA(typ.).
Soft-start pin
The soft-start time can be adjusted with an external capacitor.
The external capacitor is charged from a 5 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.
Ref.Voltage
(0.8 V)
-
-
+
EN
Shipping
Compensation
≥ 1.8 V (@ V
Control
Logic
Slope
COMP
X
pin.
Regulator
Short-Circuit
IN
Protection
= 12 V), the internal circuitry is allowed to operate and thus enable
2
Driver
Current detection
Description
+
-
EN
≤ 0.5 V (@ V
GND
V
IN
IN
=12 V), the internal
BOOT
L
X
TB7107FN
IN
2010-03-23
=12V) or less.