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參數資料
| 型號： | LT1579CS8-3 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | CAP 22UF 80V ELECT TG SMD |
| 中文描述： | 3 V FIXED POSITIVE LDO REGULATOR, 0.75 V DROPOUT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數： | 4/20頁 |
| 文件大小： | 352K |
| 代理商： | LT1579CS8-3 |
4
LT1579
ELECTRICAL CHARACTERISTICS
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
CONDITIONS
T
J
= 25
°
C
MIN
TYP
6
MAX
30
UNITS
nA
I
LOAD
= 0mA
G
2.7
3.2
V
LT1579
Switch from V
IN2
to V
IN1
Switch from
V
IN1
to V
IN2
V
SS
= 0V
V
IN1
= V
IN2
= 3.2V
G
3
μ
A
V
V
μ
A
G
G
1.2
0.75
1
2.8
0.25
G
1.5
V
IN1
= V
IN2
= V
OUT(NOMINAL)
+ 1V, High-to-Low Transition
V
IN1
= V
IN2
= 6V, I
LBO
= 20
μ
A (Note 11)
G
1.440
1.500
18
1.550
30
V
G
mV
V
IN1
= V
IN2
= 6V, V
LBI
= 1.4V, T
J
= 25
°
C
2
5
nA
I
SINK
= 20
μ
A
I
SINK
= 5mA
V
IN1
– V
OUT
= V
IN2
– V
OUT
= 1.2V (Avg), V
RIPPLE
= 0.5V
P-P
f
RIPPLE
= 120Hz, I
LOAD
= 150mA
V
IN1
= V
IN2
= V
OUT(NOMINAL)
+ 1V,
V
OUT
= –0.1V
V
IN1
= V
IN2
= –20V, V
OUT
= 0V
G
G
0.17
0.97
70
0.45
1.3
V
V
Ripple Rejection
55
dB
Current Limit
Input Reverse Leakage
Current
Reverse Output Current
G
320
400
mA
mA
G
1.0
LT1579-3
LT1579-3.3 V
OUT
= 3.3V, V
IN1
= V
IN2
= 0V
LT1579-5
V
OUT
= 5V, V
IN1
= V
IN2
= 0V
V
OUT
= 3V, V
IN1
= V
IN2
= 0V
3
3
3
12
12
12
μ
A
μ
A
μ
A
The
G
denotes specifications which apply over the full operating
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
μ
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
IN
– V
DROPOUT
.
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
OUT(NOMINAL)
= 3.3V.
Note 5:
Ground pin current will rise at T
J
> 75
°
C. This is due to internal
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.
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
VIN1
+ I
VIN2
– I
SRC
. Both I
VIN1
and I
VIN2
are specified for worst-case
conditions. I
VIN1
is specified under the condition that V
IN1
> V
IN2
and I
VIN2
is specified under the condition that V
IN2
> V
IN1
. I
SRC
is drawn from the
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
SRC
. For example, if V
IN1
= 20V, V
IN2
=
6V then I
VIN1
= 5
μ
A and I
VIN2
= 5
μ
A – 3
μ
A = 2
μ
A.
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.
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| LT1579CS8-3#PBF | 功能描述:IC LDO REG SMART DUAL 3V 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
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| LT1579CS8-3.3 | 功能描述:IC LDO REG SMART DUAL 3.3V 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學:堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應商設備封裝:SOT-6 包裝:帶卷 (TR) |
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