LT1579CGN Linear Technology, LT1579CGN Datasheet - Page 4
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LT1579CGN
Manufacturer Part Number
LT1579CGN
Description
IC LDO REG SMART DUAL ADJ 16SSOP
Manufacturer
Linear Technology
Datasheet
1.LT1579CS-5.pdf
(20 pages)
Specifications of LT1579CGN
Function
Back-Up Management
Battery Type
Smart Batteries
Operating Temperature
0°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
16-SSOP (0.150", 3.90mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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LT1579
PARAMETER
Adjust Pin Bias Current
(Notes 2, 7)
Minimum Input Voltage
(Note 8)
Minimum Load Current
Secondary Select
Threshold
Secondary Select Pin
Current (Note 7)
Low-Battery Trip Threshold
Low-Battery Comparator
Hysteresis
Low-Battery Comparator
Bias Current (Notes 7, 10)
Logic Flag Output Voltage
Ripple Rejection
Current Limit
Input Reverse Leakage
Current
Reverse Output Current
The
temperature range.
Note 1: Operating conditions are limited by maximum junction
temperature. The regulated output voltage specification will not apply for
all possible combinations of input voltage and output current. When
operating at maximum input voltage, output current must be limited.
When operating at maximum output current, the input voltage range must
be limited.
Note 2: The LT1579 (adjustable version) is tested and specified with the
adjust pin connected to the output pin and a 3 A DC load.
Note 3: Dropout voltage is the minimum input-to-output voltage
differential required to maintain regulation at the specified output current.
In dropout, the output voltage will be equal to V
Note 4: To meet the requirements for minimum input voltage, the LT1579
(adjustable version) is connected with an external resistor divider for a
3.3V output voltage (see curve of Minimum Input Voltage vs Temperature
in the Typical Performance Characteristics). For this configuration,
V
Note 5: Ground pin current will rise at T
circuitry designed to compensate for leakage currents in the output
transistor at high temperatures. This allows quiescent current to be
minimized at lower temperatures, yet maintain output regulation at high
temperatures with light loads. See the curve of Quiescent Current vs
Temperature in the Typical Performance Characteristics.
4
ELECTRICAL CHARACTERISTICS
OUT(NOMINAL)
denotes specifications which apply over the full operating
= 3.3V.
CONDITIONS
T
I
LT1579
Switch from V
Switch from V
V
V
V
V
I
I
V
f
V
V
LT1579-3
LT1579-3.3 V
LT1579-5
LOAD
SINK
SINK
RIPPLE
J
SS
IN1
IN1
IN1
IN1
IN1
IN1
= 25 C
= 0V
= V
= V
= V
– V
= V
= V
= 20 A
= 5mA
= 0mA
= 120Hz, I
IN2
IN2
IN2
OUT
IN2
IN2
J
> 75 C. This is due to internal
= V
= 6V, I
= 6V, V
= V
= –20V, V
= V
V
V
V
IN2
IN1
IN1
OUT
OUT
OUT
OUT(NOMINAL)
OUT(NOMINAL)
IN2
IN
to V
to V
LOAD
= V
LBO
= 3V, V
= 3.3V, V
= 5V, V
LBI
– V
– V
IN2
IN1
IN2
OUT
= 20 A (Note 11)
= 1.4V, T
OUT
= 150mA
DROPOUT
= 3.2V
= 0V
IN1
IN1
= 1.2V (Avg), V
IN1
+ 1V, V
+ 1V, High-to-Low Transition
= V
= V
.
J
= V
= 25 C
IN2
IN2
IN2
= 0V
= 0V
OUT
= 0V
= – 0.1V
RIPPLE
= 0.5V
Note 6: Standby current is the minimum quiescent current for a given
input while the other input supplies the load and bias currents.
Note 7: Current flow is out of the pin.
Note 8: Minimum input voltage is the voltage required on either input to
maintain the 1.5V reference for the error amplifier and low-battery
comparators.
Note 9: Total quiescent current in shutdown will be approximately equal to
I
conditions. I
is specified under the condition that V
highest input voltage only. For normal operating conditions, the quiescent
current of the input with the lowest input voltage will be equal to the
specified quiescent current minus I
6V then I
Note 10: The specification applies to both inputs independently
(LBI1, LBI2).
Note 11: Low-battery comparator hysteresis will change as a function of
current in the low-battery comparator output. See the curve of Low-Battery
Comparator Hysteresis vs Sink Current in the Typical Performance
Characteristics.
VIN1
P-P
+ I
VIN2
VIN1
– I
VIN1
= 5 A and I
SRC
is specified under the condition that V
. Both I
VIN2
VIN1
= 5 A – 3 A = 2 A.
and I
SRC
VIN2
IN2
. For example, if V
1.440
0.25
MIN
320
are specified for worst-case
55
> V
IN1
. I
1.500
0.75
0.17
0.97
TYP
400
2.7
1.2
SRC
18
70
6
1
2
3
3
3
is drawn from the
IN1
IN1
1.550
> V
MAX
0.45
3.2
2.8
1.5
1.3
1.0
30
30
12
12
12
= 20V, V
3
5
IN2
and I
UNITS
IN2
VIN2
mV
mA
mA
=
nA
nA
dB
V
A
V
V
A
V
V
V
A
A
A