A1084
AiT Semiconductor Inc.
www.ait-ic.com
5A LOW-DROPOUT POSITIVE VOLTAGE REGULATOR
THERMAL SHUTDOWN AND CURRENT LIMIT FUNCTIONS
Example
The output voltage of A1084 adjustable version satisfies this followed equation:
VOUT = VREF x (1+R2 / R1) + IADJ x R2
We can ignore IADJ because IADJ (about 50uA) is much less than the current of R1 (about 4mA).
The value of R1 should be in the range 120Ω ~ 200Ω to assure chip working normally without any load. To
assure the electrical performance showed in Table 1, the output current should be larger than 5mA. If R1 is
too large, the minimum output current should be large than 4mA, the best working condition is to assure that
the output current exceeds 10mA.
(Schematic 1)
Adjustable Version (A1084)
VOUT = VREF x (1+R2 / R1) + IADJ x R2
Fixed Output Version (A1084-XX)
REV1.2
- JUN 2007 RELEASED – SEP 2008 REVISED -
- 8 -
AITSEMI [ AiT Semiconductor ]
