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| 型号： | LTC3704IMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR INV PWM CM 10-MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 97% |
| 电源电压： | 2.5 V ~ 36 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 是 |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
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LTC3704
Wide Input Range, No R SENSE TM
Positive-to-Negative DC/DC Controller
FEATURES
DESCRIPTIO
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High Efficiency Operation (No Sense
Resistor Required)
Wide Input Voltage Range: 2.5V to 36V
Current Mode Control Provides Excellent Transient
Response
High Maximum Duty Cycle (Typ 92%)
± 1% Internal Voltage Reference
± 2% RUN Pin Threshold with 100mV Hysteresis
Micropower Shutdown: I Q = 10 μ A
Programmable Switching Frequency
(50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3 × f OSC
User-Controlled Pulse Skip or Burst Mode ? Operation
Internal 5.2V Low Dropout Voltage Regulator
Capable of Operating with a Sense Resistor for High
Output Voltage Applications (V DS >36V)
Small 10-Lead MSOP Package
The LTC ? 3704 is a wide input range, current mode,
positive-to-negative DC/DC controller that drives an
N-channel power MOSFET and requires very few external
components. Intended for low to high power applications,
it eliminates the need for a current sense resistor by
utilizing the power MOSFET’s on-resistance, thereby maxi-
mizing efficiency.
The IC’s operating frequency can be set with an external
resistor over a 50kHz to 1MHz range, and can be synchro-
nized to an external clock using the MODE/SYNC pin.
Burst Mode operation at light loads, a low minimum
operating supply voltage of 2.5V and a low shutdown
quiescent current of 10 μ A make the LTC3704 ideally
suited for battery-operated systems.
For applications requiring constant frequency operation,
the Burst Mode operation feature can be defeated using
APPLICATIO S
the MODE/SYNC pin. Higher than 36V switch voltage
applications are possible with the LTC3704 by connecting
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SLIC Power Supplies
Telecom Power Supplies
Portable Electronic Equipment
Cable and DSL Modems
Router Supplies
the SENSE pin to a resistor in the source of the power
MOSFET.
The LTC3704 is available in the 10-lead MSOP package.
, LTC, LT and LTM are registered trademarks of Linear Technology Corporation. Burst
Mode is a registered trademark of Linear Technology Corporation. No R SENSE is a
registered trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents including 5847554, 5731694.
TYPICAL APPLICATIO
V IN
R1
1M
RUN
I TH
SENSE
V IN
L1*
?
C DC
47 μ F
?
L2*
5V to 15V
V OUT
–5.0V
3A to 5A
100
90
80
Conversion Efficiency
V IN = 5V
LTC3704
70
V IN = 15V
R C
3k
NFB
FREQ
INTV CC
GATE
M1
C OUT
100 μ F
(X2)
60
V IN = 10V
MODE/SYNC
GND
D1
50
C C1
4.7nF
R T
80.6k
1%
R FB1
1.21k
1%
R FB2
3.65k
1%
C VCC
4.7 μ F
C IN
47 μ F
3704 TA01
GND
40
30
20
0.001
0.01 0.1 1.0
OUTPUT CURRENT (A)
10
C IN , C DC : TDK C5750X5R1C476M
C OUT : TDK C5750X5R0J107M
C VCC : TAIYO YUDEN LMK316BJ475ML
D1: MBRD835L (ON SEMICONDUCTOR)
L1, L2: BH ELECTRONICS BH510-1009
M1: Si4884 (SILICONIX/VISHAY)
3704 TA01b
Figure 1. High Efficiency Positive to Negative Supply
3704fb
1
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