ISL6412_07 Datasheet, PDF (7/10 Pages) Intersil Corporation – Triple Output, Low-Noise LDO Regulator with Integrated Reset Circuit

ISL6412
Typical Performance Curves
The test conditions for the Typical Operating Performance are: V_IN = 3.3V, T_A = +25°C,
Unless Otherwise Noted (Continued)
-10
-20
-30
FAULT
1V/DIV
-40
-50
VOUT1/2/3
1V/DIV
500ms/DIV
FIGURE 9. THERMAL SHUTDOWN OPERATION
-60
10
100
1k
10k
100k
1M
FREQUENCY (A)
FIGURE 10. LDO1 POWER SUPPLY REJECTION
(IOUT1 = 100mA, COUT = 10µF MLCC)
VIN
0.5V/DIV
VOUT1
0.5V/DIV
VIN = 2.7V
FAULT
0.5V/DIV
FIGURE 11. VOUT1 REGULATION DOWN TO VIN = 2.7V; FAULT MONITORS VOUT1 ONLY
Pin Descriptions
OUT1 - This pin is the output for LDO1. Bypass with a
minimum of 2.2µF, low ESR capacitor to GND for stable
operation.
V_IN - Supply input pins. Connect to input power source.
Bypass with a minimum 2.2μF capacitor to GND. Both V_IN
pins must be tied together on the PC board, close to the IC.
GND - Ground for LDO1 and LDO2.
CC1 - Compensation Capacitor for LDO1. Connect a
0.033µF capacitor from CC1 to GND.
SHDN - Shutdown input for all LDOs. Connect to V_IN for
normal operation. Drive this pin LOW to turn off all LDOs.
OUT2 - This pin is the output for LDO2. Bypass with a
minimum of 2.2µF, low ESR capacitor to GND for stable
operation.
CT - Timing pin for the RESET circuit pulse width.
CC2 - Compensation capacitor for LDO2. Connect a
0.033µF capacitor from CC2 to GND.
OUT3 - This pin is output for LDO3. Bypass with a minimum
of 2.2µF, low ESR capacitor to GND3 for stable operation.
GND3 - Ground pin for LDO3.
CC3 - Compensation capacitor for LDO3. Connect a
0.033µF capacitor from CC3 to GND3.
FAULT1 - This is the power good indicator for LDO1. When
the 1.8V output is out of regulation this pin goes LOW. This
7
FN9067.1
March 20, 2007