ISL78302 Datasheet, PDF (5/11 Pages) Intersil Corporation – Dual LDO with Low Noise, High Performance and Low IQ

ISL78302
Electrical Specifications Unless otherwise noted, all parameters are guaranteed over the operational supply voltage and
temperature range of the device as follows: T_A = -40°C to +105°C; V_IN = (V_O + 0.5V) to 6.5V with a minimum V_IN of 2.3V; C_IN = 1µF; C_O = 1µF;
C_BYP = 0.01µF; C_POR = 0.01µF. Boldface limits apply over the operating temperature range, -40°C to +105°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
MAX
(Note 8) TYP (Note 8)
UNITS
Output Noise Voltage
I_O = 100µA, V_O = 1.5V, T_A = +25°C, C_BYP = 0.01µF
BW = 10Hz to 100kHz
37
µV_RMS
DEVICE START-UP CHARACTERISTICS
Device Enable Time
t_EN Time from assertion of the ENx pin to when the output
voltage reaches 95% of the VO(nom)
250
500
µs
LDO Soft-Start Ramp Rate
t_SSR Slope of linear portion of LDO output voltage ramp during
start-up
30
60
µs/V
EN1, EN2 PIN CHARACTERISTICS
Input Low Voltage
V_IL
Input High Voltage
V_IH
Input Leakage Current
I_IL, I_IH
Pin Capacitance
C_PIN
POR1, POR2 PIN CHARACTERISTICS
Informative
-0.3
1.35
0.5
V
V_IN + 0.3
V
0.1
µA
5
pF
POR1, POR2 Thresholds
POR1 Delay
POR2 Delay
POR1, POR2 Pin Output Low
Voltage
V_POR+
V_POR-
t_P1LH
t_P1HL
t_P2LH
t_P2HL
V_OL
As a percentage of nominal output voltage
C_POR = 0.01µF
@ I_OL = 1.0mA
91
94
97
%
87
90
93
%
0.5
2.0
3.2
ms
25
µs
100
200
300
ms
25
µs
0.2
V
POR1, POR2 Pin Internal Pull-Up
Resistance
R_POR
78
100
180
kΩ
NOTES:
7. VOx = 0.98*VOx(NOM); Valid for VOx greater than 1.85V.
8. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
EN1
EN2
t_EN
V_POR+
VO1
VO2
POR1
POR2
t_P1LH
t_P2LH
V_POR-
V_POR+
<t_P1HL
<t_P2HL
t_P1HL
t_P2HL
V_POR-
FIGURE 1. TIMING PARAMETER DEFINITION
5
FN7696.0
January 28, 2011