參數(shù)資料
型號(hào)： LTC1538CG-AUX
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
中文描述： 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 0.209 INCH, PLASTIC, SSOP-28
文件頁數(shù)： 1/32頁
文件大小： 451K
代理商： LTC1538CG-AUX
1
LTC 1538-AUX/LTC 1539
Dual High Efficiency,
Low Noise, Synchronous
Step-Down Switching Regulators
DESCRIPTIO
N
U
Figure 1. High Efficiency Dual 5V/3V Step-Down Converter
BOOST 2
BOOST 1
TGL2
TGS2
SW2
BG2
SENSE
+
2
SENSE
–
2
V
OSENSE2
I
TH2
TGL1
M3*
M1
M2
TGS1
D1
MBR140T3
V
OUT1
5V
3.5A
V
3.3V
3.5A
L1
10
μ
H
SW1
BG1
LTC1539
SENSE
+
1
SENSE
–
1
I
TH1
RUN/SS1
C
SS1
0.1
μ
F
C
C1
1000pF
C
OUT1
220
μ
F
10V
R
SENSE1
0.03
R
SENSE2
0.03
C
OUT
220
μ
F
10V
R
C1
10k
RUN/SS2
PGND
SGND
V
PROG2
C
DSC
INTV
CC
D
B2
, CMDSH-3
D
B1
, CMDSH-3
V
IN
V
PROG1
D2
MBR140T3
C
B1
0.1
F
C
B2
,
0.1
μ
F
4.7
μ
F
16V
M6*
1538 F01
M4
1000pF
1000pF
C
56pF
C
SS2
0.1
μ
F
C
220pF
M1, M2, M4, M5: Si4412DY M3, M6: IRLML2803 *NOT REQUIRED FOR LTC1538-AUX
C
470pF
C
1000pF
R
C2
10k
+
L2
10
μ
H
V
5.2V TO 28V
5V STANDBY
+
+
C
IN
22
μ
F
35V
×
4
+
BOLD LINES INDICATE HIGH CURRENT PATHS
M5
TYPICAL APPLICATIO
N
U
I
Maintains Constant Frequency at Low Output Currents
I
Dual N-Channel MOSFET Synchronous Drive
I
Programmable Fixed Frequency (PLL Lockable)
I
Wide V
IN
Range: 3.5V to 36V Operation
I
Ultrahigh Efficiency
I
Very Low Dropout Operation: 99% Duty Cycle
I
Low Dropout, 0.5A Linear Regulator for VPP
Generation or Low Noise Audio Supply
I
Built-In Power-On Reset Timer
I
Programmable Soft Start
I
Low-Battery Detector
I
Remote Output Voltage Sense
I
Foldback Current Limiting (Optional)
I
Pin Selectable Output Voltage
I
5V Standby Regulator Active in Shutdown: I
Q
< 200
μ
A
I
Output Voltages from 1.19V to 9V
I
Available in 28- and 36-Lead SSOP Packages
The LTC
1538-AUX/LTC1539 are dual, synchronous step-
down switching regulator controllers which drive external
N-channel power MOSFETs in a phase-lockable fixed
frequency architecture. The Adaptive Power
TM
output stage
selectively drives two N-channel MOSFETs at frequencies
up to 400kHz while reducing switching losses to maintain
high efficiencies at low output currents.
An auxiliary 0.5A linear regulator using an external PNP
pass device provides a low noise, low dropout voltage
source. A secondary winding feedback control pin (SFB1)
guarantees regulation regardless of load on the main
output by forcing continuous operation.
A 5V/20mA regulator, internal 1.19V reference and an
uncommitted comparator remain active when both con-
trollers are shut down. A power-on reset timer (POR) is
included which generates a signal delayed by 65536/f
CLK
(typ 300ms) after the controller’s output is within 5% of
the regulated first voltage. Internal resistive dividers pro-
vide pin selectable output voltages with remote sense
capability on one of the two outputs.
The operating current levels are user-programmable via
external current sense resistors. Wide input supply range
allows operation from 3.5V to 30V (36V maximum).
, LTC and LT are registered trademarks of Linear Technology Corporation.
Adaptive Power is a trademark of Linear Technology Corporation.
FEATURES
I
Notebook and Palmtop Computers, PDAs
I
Portable Instruments
I
Battery-Operated Devices
I
DC Power Distribution Systems
APPLICATIO
S
U
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1538CG-AUX#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1538CG-AUX#TR 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1538CG-AUX#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1538IG-AUX 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1538IG-AUX#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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