參數(shù)資料
型號(hào): LT1578C
廠商: Linear Technology Corporation
英文描述: CAP 22UF 50V ELECT TG SMD
中文描述: 1.5A的,200kHz降壓型開關(guān)穩(wěn)壓器
文件頁數(shù): 1/28頁
文件大小: 286K
代理商: LT1578C
1
LT1578/LT1578-2.5
1.5A, 200kHz Step-Down
Switching Regulator
3.3V Buck Converter
Efficiency vs Load Current
I
1.5A Switch Current
I
High Efficiency—Low Loss 0.2
Switch
I
Constant 200kHz Switching Frequency
I
4V to 15V Input VoltageRange
I
Minimum Output: 1.21V
I
Low Supply Current: 1.9mA
I
Low Shutdown Current: 20
μ
A
I
Easily Synchronizable Up to 400kHz
I
Cycle-by-Cycle Current Limit
I
Reduced EMI Generation
I
Low Thermal Resistance SO-8 Package
I
Uses Small Low Value Inductors
The LT
1578 is a 200kHz monolithic buck mode switching
regulator. A 1.5A switch is included on the die along with
all the necessary oscillator, control and logic circuitry. The
topology is current mode for fast transient response and
good loop stability. The LT1578 is a modified version of the
LT1507 that has been optimized for noise sensitive appli-
cations. It will operate over a 4V to 15V input range.
In addition, the reference voltage has been lowered to al-
low the device to produce output voltages down to 1.2V.
Quiescent current has been reduced by a factor of two.
Switch on resistance has been reduced by 30%. Switch tran-
sition times have been slowed to reduce EMI generation.
The oscillator frequency has been reduced to 200kHz to
maintain high efficiency over a wide output current range.
The pinout has been changed to improve PC layout by al-
lowing the high current, high frequency switching circuitry
to be easily isolated from low current, noise sensitive con-
trol circuitry. The new SO-8 package includes a fused
ground lead that significantly reduces the thermal resistance
of the device to extend the ambient operating temperature
range. Standard surface mount external parts can be used
including the inductor and capacitors.
I
Portable Computers
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Battery-Powered Systems
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Battery Chargers
I
Distributed Power Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LOAD CURRENT (A)
0
E
90
85
80
75
70
65
60
55
50
0.25
0.50
0.75
1.00
1578 TA02
1.25
1.50
V
OUT
= 3.3V
V
= 5V
L = 25
μ
H
DESCRIPTIOU
FEATURES
APPLICATIU
BOOST
LT1578
V
IN
SHDN
OUTPUT**
3.3V, 1.25A
* RIPPLE CURRENT RATING
I
/2
** INCREASE L1 TO 30
μ
H FOR LOAD
CURRENTS ABOVE 0.6A AND TO
60
μ
H ABOVE 1A
SEE APPLICATIONS INFORMATION
INPUT
5V TO 15V
1578 TA01
C2
0.33
μ
F
C
100pF
D1
1N5818
C1
100
μ
F, 10V
SOLID
TANTALUM
C3*
10
μ
F TO
50
μ
F
OPEN = ON
D2
1N914
L1**
15
μ
H
V
SW
FB
GND
V
C
+
+
R2
4.99k
8R1
TYPICAL APPLICATIO
N
U
相關(guān)PDF資料
PDF描述
LT1578CS8 CAP 47UF 50V ELECT TG SMD
LT1578CS8-2.5 CAP 10UF 63V ELECT TG SMD
LT1578I CAP 22UF 63V ELECT TG SMD
LT1578 1.5A, 200kHz Step-Down Switching Regulator(1.5A, 200kHz,步降開關(guān)穩(wěn)壓器)
LT1579CS CAP 47UF 63V ELECT TG SMD
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1578CS8 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT1578CS8#PBF 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT1578CS8#TR 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT1578CS8#TRPBF 功能描述:IC REG BUCK ADJ 1.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT1578CS8-2.5 功能描述:IC REG BUCK 2.5V 1.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓(降壓) 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V,1.5V,1.8V,2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP,10-MSOP(0.118",3.00mm 寬)裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤