參數(shù)資料
型號： LTC1700
廠商： Linear Technology Corporation
英文描述： Quadruple 2-Input Exclusive-OR Gates 14-SO 0 to 70
中文描述： 無檢測電阻同步升壓型DC / DC控制器
文件頁數(shù)： 1/16頁
文件大小： 194K
代理商： LTC1700
LTC1700
1
FEATURES
DESCRIPTIOU
The LTC
1700 is a current mode synchronous step-up
DC/DC controller that drives external N-channel and
P-channel power MOSFETs using a constant frequency
PWM architecture. Current limiting is provided by sensing
the voltage drop across the main MOSFET, eliminating the
need of a sense resistor. This No R
SENSE
the LTC1700 maintain high efficiency at heavy loads while
Burst Mode operation ensures high efficiency at light loads,
thus providing high efficiencies over a wide range of load
currents.
The LTC1700 operates at a minimum input voltage as low as
0.9V. The device boasts a
±
1.5% output voltage accuracy and
consumes only 200
μ
A of quiescent current. In shutdown, it
only draws 10
μ
A.
To prevent inductor current runaway, the duty cycle is limited
to 90%. Overvoltage protection is also provided which shuts
both the external MOSFETs off when tripped.
High constant operating frequency of 530kHz allows the use
of small inductors and output capacitors. The LTC1700 can
also be synchronized between 400kHz to 750kHz. Burst
Mode operation is inhibited when the device is externally
clocked or when the SYNC/MODE pin is pulled low to reduce
noise and RF interference.
APPLICATIU
TYPICAL APPLICATIOU
I
High Efficiency: Up to 95%
I
No Current Sense Resistor Required
I
Constant Frequency 530kHz Operation Allows
Small Size, Surface Mount Inductors
I
OPTI-LOOP
TM
Compensation Minimizes C
OUT
I
Selectable Burst Mode
TM
Operation
I
Minimum Start-Up Voltage as low as 0.9V
I
Synchronizable Between 400kHz and 750kHz
I
Micropower Shutdown: 10
μ
A
I
Current Mode Operation for Excellent Line and Load
Transient Response
I
Soft-Start Reduces Supply Current Transients
I
1.5% Output Voltage Accuracy
I
Uses Low Value, Small Size, Surface Mount Inductors
I
Available in 10-Lead MSOP Package
TM
technique helps
I
Cellular Telephones
I
Wireless Modems
I
RF Communications
I
2.5V to 3.3V, 2.5V to 5V Converters
I
Battery-Powered Equipment
I
Telecom/Network Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode, OPTI-LOOP and No R
SENSE
are trademarks of Linear Technology Corporation.
No R
SENSE
Synchronous
Step-Up DC/DC Controller
Figure 1. High Efficiency Step-Up Converter
Efficiency vs Load Current
I
TH
RUN/SS
SGND
V
FB
SYNC/MODE
SW
BG
PGND
TG
V
OUT
LTC1700
2
4
1
3
5
10
8
9
6
7
+
L1
1.8
μ
H
C3
220pF
C6
10
μ
F
+
C7
330
μ
F
6V
C2
68
μ
F
6.3V
C4
0.1
μ
F
C1
22
μ
F
R3
2200
R1
316k
R2
100k
M2
M1
V
3.3V to 4.2V
5V
2A
1700 F01a
C5
220pF
C1: CERAMIC TAIYO YUDEN LMK432BJ226MM
C2: AVX TAJB686K006R
L1: TOKO 919AS-IR8N (D104C TYPE)
C6: CERAMIC TAIYO YUDEN JMK316BJ106ML
C7: SANYO POSCAP 6TPB330M
M1: SILICONIX Si9804
M2: SILICONIX Si9803
LOAD CURRENT (A)
0.001
E
100
90
80
70
60
50
40
0.01
0.1
1.0
1700 F01b
V
IN
= 4.2V
V
IN
= 3.3V
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1700EMS 功能描述:IC REG CTRLR BST PWM CM 10-MSOP 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1700EMS#PBF 功能描述:IC REG CTRLR BST PWM CM 10-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LTC1700EMS#TR 功能描述:IC REG CTRLR BST PWM CM 10-MSOP 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1700EMS#TRPBF 功能描述:IC REG CTRLR BST PWM CM 10-MSOP 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:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1701BES5 制造商:Linear Technology 功能描述:1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO5
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