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參數(shù)資料
| 型號： | LTC1707 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70 |
| 中文描述： | 高效率單片同步降壓型開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 213K |
| 代理商： | LTC1707 |
1
LTC1707
High Efficiency Monolithic
Synchronous Step-Down
Switching Regulator
December 1999
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 1b. Efficiency vs Output Load Current
22
μ
F
16V
47pF
V
*
3V TO
8.5V
1707 F01a
6
2
7
1
5
8
3
SW
V
REF
V
FB
V
IN
RUN
SYNC/MODE
I
TH
LTC1707
+
15
μ
H
100
μ
F
6.3V
80.6k
*V
FOLLOWS V
IN
FOR
3V < VIN < 3.3V
249k
V
3.3V
+
GND
4
OUTPUT CURRENT (mA)
1
70
E
90
95
100
10
100
1000
1707 F01b
85
80
75
V
OUT
= 3.3V
V
IN
= 6V
V
IN
= 3.6V
V
IN
= 8.4V
Figure 1a. High Efficiency Low Dropout Step-Down Converter
The LTC
1707 is a high efficiency monolithic current
mode synchronous buck regulator using a fixed frequency
architecture. The operating supply range is from 8.5V
down to 2.85V, making it suitable for both single and dual
lithium-ion battery-powered applications. Burst Mode op-
eration provides high efficiency at low load currents.
100% duty cycle provides low dropout operation, extend-
ing operating time in battery-powered systems.
The switching frequency is internally set at 350kHz,
allowing the use of small surface mount inductors. For
noise sensitive applications it can be externally synchro-
nized up to 550kHz. Burst Mode operation is inhibited
during synchronization or when the SYNC/MODE pin is
pulled low preventing low frequency ripple from interfer-
ing with audio circuitry. Soft-start is provided by an
external capacitor.
The internal synchronous MOSFET switch increases effi-
ciency and eliminates the need for an external Schottky
diode, saving components and board space. Low output
voltages down to 0.8V are easily achieved due to the 0.8V
internal reference. The LTC1707 comes in an 8-lead SO
package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a trademark of Linear Technology Corporation.
I
600mA Output Current (V
IN
≥
4V)
I
High Efficiency: Up to 96%
I
Constant Frequency: 350kHz Synchronizable
to 550kHz
I
2.85V to 8.5V V
IN
Range
I
0.8V Feedback Reference Allows Low Voltage
Outputs: 0.8V
≤
V
OUT
≤
V
IN
I
No Schottky Diode Required
I
1.19V
±
1% Reference Output Pin
I
Selectable Burst Mode
TM
Operation/Pulse
Skipping Mode
I
Low Dropout Operation: 100% Duty Cycle
I
Precision 2.7V Undervoltage Lockout
I
Current Mode Control for Excellent Line and
Load Transient Response
I
Low Quiescent Current: 200
μ
A
I
Shutdown Mode Draws Only 15
μ
A Supply Current
I
Available in 8-Lead SO Package
APPLICATIU
I
Cellular Telephones
I
Portable Instruments
I
Wireless Modems
I
RF Communications
I
Distributed Power Systems
I
Single and Dual Cell Lithium
FEATURES
DESCRIPTIOU
TYPICAL APPLICATIO
U
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| LTC1707CS8 | 功能描述:IC REG BUCK SYNC ADJ 0.6A 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1707CS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1707CS8#TR | 功能描述:IC REG BUCK SYNC ADJ 0.6A 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1707CS8#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 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:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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