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| 型号： | MAX8625AETD+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC 0.8A 14TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，1.25 V ~ 4 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 其它名称： | MAX8625AETD+TDKR |
High-Efficiency, Seamless Transition,
Step-Up/Down DC-DC Converter
FAULT
TIMEOUT
(ASYNCHRONOUS
FROM ANYWHERE)
ERROR
ON = 1
P1, P2 = OFF
N1, N2 = ON
OFF
ON = 0
P1, P2 = OFF
N1, N2 = ON
I Q = 0 μ A
ON = 0
(ASYNCHRONOUS
FROM
ANYWHERE)
TPUP
POWER-UP
ON = 1, P1, P2 = OFF, N1, N2 = ON,
OSC = ON AND REF = ON IF UVLO OK
TRUN
REFOK = 0 OR
UVLO = 0
(ASYNCHRONOUS
FROM ANYWHERE)
Figure 2. State Diagram
PHASE 2
SLOW CHARGE/
DISCHARGE
OSC = ON
P1, P2 = ON
N1, N2 = OFF
T2-3
PHASE 3
FAST DISCHARGE
OSC = ON
P2, N1 = ON
P1, N2 = OFF
T1-3
T1-2
T3-1
T3-4
(SKIP)
PHASE 1
FAST-CHARGE
OSC = ON
P1, N2 = ON
P2, N1 = OFF
T4-1
PHASE 4
HOLD
OSC = OFF
N1, N2 = ON
P1, P2 = OFF
shuttling current in and out of the output capacitor. If
SKIP is asserted high for forced-PWM mode, phase 4 is
not entered and current shuttling is allowed (and is
necessary to maintain the PWM operation frequency
when no load is present).
Step-Up Operation (V IN < V OUT )
During medium and heavy loads when V IN < V OUT,
MOSFETs P1 and N2 turn on at the clock edge to ramp
up the inductor current. Phase 1 terminates when the
inductor current reaches the peak target current set by
the PWM comparator and N2 turns off. This is followed
by a slow-discharge phase (phase 2) instead of a
charge phase (since V IN is less than V OUT ) when P2
turns on. The slow-discharge phase terminates on a
clock edge. The converter now enters the fast-dis-
charge phase (phase 3). During phase 3, P1 turns off
and N1 turns on. At the end of the minimum time, both
P2 and N1 turn off and the cycle repeats.
If SKIP is asserted low, during light loads when inductor
current falls to zero in phase 3, the converter switches to
phase 4 (hold) to reduce power consumption and avoid
shuttling current in and out of the output. If SKIP is high
to assert forced-PWM mode, the converter never enters
phase 4 and allows negative inductor current.
Step-Up/Down Transition-Zone Operation
(V IN = V OUT )
When V IN = V OUT , the converter still goes through the
three phases for moderate to heavy loads. However,
the maximum time is now spent in phase 2 where
inductor current di/dt is almost zero, since it is propor-
tional to (V IN - V OUT ). This eliminates transition glitches
10
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相关代理商/技术参数 |
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|---|---|
| MAX8625AEVKIT+ | 制造商:Maxim Integrated Products 功能描述:EVAL BD FOR MAX8625A - Boxed Product (Development Kits) |
| MAX8625EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY SEAMLESS TRANSITIO - Boxed Product (Development Kits) |
| MAX8627ETD+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 14TDFN EP - Rail/Tube |
| MAX8627ETD+T | 功能描述:直流/直流开关转换器 20uA 1MHz Synch Boost Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8627EVKIT | 制造商:Maxim Integrated Products 功能描述:LOW VBATT 20+A IQ 1MHZ SYNCHRONO - Rail/Tube |
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