参数资料
型号: LTC1708EG-PG#TRPBF
厂商: Linear Technology
文件页数: 1/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 36-SSOP
标准包装: 2,000
PWM 型: 电流模式
输出数: 2
频率 - 最大: 350kHz
占空比: 99.4%
电源电压: 3.5 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 36-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
LTC1708-PG
Dual Adjustable 5-Bit VID
High Efficiency, 2-Phase Current Mode
Synchronous Buck DC/DC Controller
FEATURES
DESCRIPTIO
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s
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Out-of-Phase Controllers Reduce Input Capacitance
and Power Supply Induced Noise
OPTI-LOOP ? Compensation Minimizes C OUT
Power Good Output Monitors Both Outputs
5-Bit Mobile VID Control, V OUT : 0.9V to 2.0V
Dual N-Channel MOSFET Synchronous Drive
± 1% Output Voltage Accuracy
DC Programmed Fixed Frequency 150kHz to 300kHz
Wide V IN Range: 3.5V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Latched Short-Circuit Shutdown with Defeat Option
Output Overvoltage Protection
Remote Output Voltage Sense
Low Shutdown Current: 20 μ A
5V and 3.3V Standby Regulators
Selectable Constant Frequency, Burst Mode ? and
The LTC ? 1708 is a dual adjustable 5-bit VID program-
mable step-down switching regulator controller that drives
all N-Channel power MOSFET stages. A constant fre-
quency current mode architecture allows adjustment of
the frequency up to 300kHz. Power loss and noise due to
the ESR of the input capacitance are minimized by oper-
ating the two main controller output stages out of phase.
OPTI-LOOP compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The precision 0.8V reference is compat-
ible with future microprocessor generations, and a wide
3.5V to 30V (36V maximum) input supply range that
encompasses all battery chemistries. A power good out-
put indicates when the output voltages are within 7.5% of
their programmed value.
A RUN/SS pin for each controller provides both soft-start
and an optional timed, short-circuit shutdown. Other
Continuous Operation
APPLICATIO S
protection features include: internal foldback current lim-
iting and an output overvoltage crowbar. The forced
continuous control pin (FCB) can be used to inhibit Burst
s
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Notebook and Palmtop Computers, PDAs
Portable Instruments
Mode operation or to regulate a third, flyback output.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
V IN
× 4
L1
1 μ H
M1
+
4.7 μ F
C B1 0.47 μ F
D3
V IN
TG1
BOOST1
VIDV CC INTV CC
TG2
BOOST2
D4
1 μ F
CERAMIC
C B2 0.1 μ F
M3a
C IN
10 μ F
50V
CERAMIC
L2
2.2 μ H
4.75V TO 28V
SW1
SW2
D1
M2
BG1
LTC1708-PG
BG2
M3b
D2
5 VID BITS
VID0 TO VID4
SENSE1 +
PGND
SENSE2 +
R SENSE1
0.003 ?
1000pF
SENSE1 –
PGOOD
SENSE2 –
1000pF
R SENSE2
0.01 ?
V OUT2
C OUT1a +
V OUT1
0.925V TO
2.00V
14.1A
10 μ F
6.3V
CERAMIC
C OUT1
270 μ F
2V
SP
× 4
C C1
1500pF
R C1
22k
ATTNIN EAIN2
I TH1 I TH2
RUN/SS1 SGND RUN/SS2
C SS1 C SS2
0.1 μ F 0.1 μ F
C C2
220pF
R C2
15k
R3
20k
1%
R4
63.4k
1%
C OUT
180 μ F
4V
SP
+
1.5V
4A
M1: IRF7811
M2: 1RF7809
M3a, M3b: FDS6982
L1: VISHAY 5050CE
ATTNOUT CONNECTED TO EAIN1
1628 F01
Figure 1. High Efficiency VID Controlled, 2-Output Step-Down Converter
1708f
1
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LTC1709EG 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC1709EG#PBF 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR)
LTC1709EG#TR 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC1709EG#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR)
LTC1709EG7 制造商:Linear Technology 功能描述: