S1F7760X Epson Electronics America, Inc., S1F7760X Datasheet - Page 7

• Manufacturer Part Number: S1F7760X
• Description: Power Supply Ic
• Manufacturer: Epson Electronics America, Inc.

5. DESCRIPTION OF BLOCK DIAGRAM
(1) Reference voltage: V
Generates reference voltage and reference current required for the inside of IC.
(2) Comparator CMP
Compares the divided potentials of resistances connected between power supply (V
voltage generated inside IC (V
(3) Resistances for detecting voltage: R1, R2, R3
Divided potential resistances which determine detection and release voltages. Either voltage is selectable with
aluminum option.
(4) Hysteresis: Q1
A transistor for hysteresis to prevent malfunction (output oscillation, etc.) caused by noise in power supply.
(5) Output securing circuit
Forces output pin to output fixed voltage Hi-Z if IC’s operational voltage drops to the lower limit or lower.
(6) Output transistors: Q2, Q3
Transistors to output by P-ch open drain (Q2) and N-ch open drain (Q3).
6. PACKAGE
6.1 SOT89-3pin (S1F7760xY0x000L)
Pin Assignment
Pin Description
Rev.1.4
Pin name
OUT
V
V
DD
SS
I/O
O
I
I
REF
Pin No.
REF
1
2
3
).
Fig.6.1 SOT89-3 Pin Assignment
Table 6.1 List of SOT89-3 Pins
Detected-voltage output pin (selectable from P-ch/N-ch open drain)
Input voltage pin (negative)
Input voltage pin (positive)
1
EPSON
2
S1F7760x Series Technical Manual
3
Function
REG
) with the reference
3