参数资料
型号: LTC3407EDD#TRPBF
厂商: Linear Technology
文件页数: 5/16页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 1A DL 10DFN
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 2
输出电压: 0.6 V ~ 5 V
输入电压: 2.5 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 1.5MHz
电流 - 输出: 1A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-DFN(3x3)
LTC3407
TYPICAL PERFORMANCE CHARACTERISTICS
Ef?ciency vs Load Current
Ef?ciency vs Load Current
Line Regulation
100
95
90
3.3V
2.7V
100
95
90
3.3V
2.7V
0.5
0.4
0.3
0.2
V OUT = 1.8V
I OUT = 200mA
T A = 25 ° C
85
80
75
70
4.2V
85
80
75
70
4.2V
0.1
0
–0.1
–0.2
–0.3
65
60
1
V OUT = 1.2V Burst Mode OPERATION
CIRCUIT OF FIGURE 1
10 100 1000
65
60
1
V OUT = 1.5V Burst Mode OPERATION
CIRCUIT OF FIGURE 1
10 100 1000
–0.4
–0.5
2
3
4
5
6
LOAD CURRENT (mA)
PIN FUNCTIONS
3407 G13
LOAD CURRENT (mA)
3407 G14
V IN (V)
3407 G15
V FB1 (Pin 1): Output Feedback. Receives the feedback volt-
age from the external resistive divider across the output.
Nominal voltage for this pin is 0.6V.
RUN1 (Pin 2): Regulator 1 Enable. Forcing this pin to V IN
enables regulator 1, while forcing it to GND causes regulator
1 to shut down. This pin must be driven; do not ?oat.
V IN (Pin 3): Main Power Supply. Must be closely decoupled
to GND.
SW1 (Pin 4): Regulator 1 Switch Node Connection to the
Inductor. This pin swings from V IN to GND.
GND (Pin 5): Ground. This pin is not connected internally.
Connect to PCB ground for shielding.
MODE/SYNC (Pin 6): Combination Mode Selection and
Oscillator Synchronization. This pin controls the opera-
tion of the device. When tied to V IN or GND, Burst Mode
operation or pulse-skipping mode is selected, respectively.
Do not ?oat this pin. The oscillation frequency can be
synchronized to an external oscillator applied to this pin
and pulse-skipping mode is automatically selected.
SW2 (Pin 7): Regulator 2 Switch Node Connection to the
Inductor. This pin swings from V IN to GND.
POR (Pin 8): Power-On Reset . This common-drain logic
output is pulled to GND when the output voltage is not
within ±8.5% of regulation and goes high after 175ms
when both channels are within regulation.
RUN2 (Pin 9): Regulator 2 Enable. Forcing this pin to V IN
enables regulator 2, while forcing it to GND causes regulator
2 to shut down. This pin must be driven; do not ?oat.
V FB2 (Pin 10): Output Feedback. Receives the feedback
voltage from the external resistive divider across the output.
Nominal voltage for this pin is 0.6V.
Exposed Pad (GND) (Pin 11): Power Ground. Connect to
the (–) terminal of C OUT , and (–) terminal of C IN . Must be
soldered to electrical ground on PCB.
3407fa
5
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