參數(shù)資料
型號(hào)： LTC1625
廠商： Linear Technology Corporation
英文描述： Synchronous Step-Down Switching Regulator(3.3V輸出，同步步降開關(guān)穩(wěn)壓器)
中文描述： 同步降壓型開關(guān)穩(wěn)壓器（3.3V輸出，同步步降開關(guān)穩(wěn)壓器）
文件頁數(shù)： 1/24頁
文件大?。?/td> 378K
代理商： LTC1625
1
LTC1625
No R
SENSE
Synchronous Step-Down
Switching Regulator
TM
Current Mode
FEATURES
DESCRIPTIO
N
U
The LTC
1625 is a synchronous step-down switching
regulator controller that drives external N-Channel power
MOSFETs using few external components. Current mode
control with MOSFET V
DS
sensing eliminates the need for
a sense resistor and improves efficiency. The frequency of
a nominal 150kHz internal oscillator can be synchronized
to an external clock over a 1.5:1 frequency range.
Burst Mode
TM
operation at low load currents reduces
switching losses and low dropout operation extends oper-
ating time in battery-powered systems. A forced continu-
ous mode control pin can assist secondary winding
regulation by disabling Burst Mode operation when the
main output is lightly loaded.
Fault protection is provided by foldback current limiting
and an output overvoltage comparator. An external ca-
pacitor attached to the RUN/SS pin provides soft start
capability for supply sequencing. A wide supply range
allows operation from 3.7V (3.9V for LTC1625I) to 36V at
the input and 1.19V to V
IN
at the output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No R
SENSE
and Burst Mode are trademarks of Linear Technology Corporation.
I
Highest Efficiency Current Mode Controller
I
No Sense Resistor Required
I
Stable High Current Operation
I
Dual N-Channel MOSFET Synchronous Drive
I
Wide V
IN
Range: 3.7V to 36V
I
Wide V
OUT
Range: 1.19V to V
IN
I
±
1% 1.19V Reference
I
Programmable Fixed Frequency with Injection Lock
I
Very Low Drop Out Operation: 99% Duty Cycle
I
Forced Continuous Mode Control Pin
I
Optional Programmable Soft Start
I
Pin Selectable Output Voltage
I
Foldback Current Limit
I
Output Overvoltage Protection
I
Logic Controlled Micropower Shutdown: I
Q
< 30
μ
A
I
Available in 16-Lead Narrow SSOP and SO Packages
TYPICAL APPLICATIO
N
U
Figure 1. High Efficiency Step-Down Converter
+
+
V
IN
TK
SYNC
RUN/SS
LTC1625
V
OSENSE
TG
SW
C
B
0.22
μ
F
D
CMDSH-3
C
C
2.2nF
R
C
10k
M2
Si4410DY
D1
MBRS140T3
M1
Si4410DY
C
VCC
4.7
μ
F
1625 F01
L1
10
μ
H
C
IN
10
μ
F
30V
×
2
BOOST
INTV
CC
BG
I
TH
V
PROG
SGND
PGND
+
C
OUT
100
μ
F
10V
×
3
V
3.3V
4.5A
V
5V TO
28V
C
SS
0.1
μ
F
LOAD CURRENT (A)
0.01
E
80
90
100
0.1
1
10
1625 TA01
70
60
V
IN
= 10V
V
OUT
= 5V
V
OUT
= 3.3V
Efficiency vs Load Current
APPLICATIO
S
U
I
Notebook and Palmtop Computers, PDAs
I
Cellular Telephones and Wireless Modems
I
Battery Chargers
I
Distributed Power
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1625CGN 功能描述:IC REG CTRLR BUCK PWM CM 16-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
LTC1625CGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR)
LTC1625CGN#PBF 制造商:Linear Technology 功能描述:IC SYNC STEP-DOWN REGULATOR SSOP-16 制造商:Linear Technology 功能描述:IC, SYNC STEP-DOWN REGULATOR, SSOP-16
LTC1625CGN#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-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
LTC1625CGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-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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