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| 型号： | MAX1536ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3.6A 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 输入电压： | 3 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 3.6A |
| 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-
Down Regulator with Dynamic Output Voltage Control
Thermal Shutdown
The MAX1536 features a thermal fault-protection circuit.
When the junction temperature rises above +165°C, a
The junction-to-ambient thermal resistance required to
dissipate this amount of power is calculated by:
thermal sensor shuts down the MAX1536 regardless of
V SHDN . The MAX1536 is reactivated after the junction
temperature cools to +150°C.
θ JA ≤
T J(MAX ) - T A(MAX )
P SL + P CL
Thermal Resistance
Junction-to-ambient thermal resistance, θ JA , is highly
dependent on the amount of copper area connected to
the exposed backside pad. Airflow over the board sig-
nificantly reduces θ JA . For heat-sinking purposes, even-
ly distribute the copper area connected at the IC among
the high-current pins. Refer to the Maxim website
(www.maxim-ic.com) for QFN thermal considerations.
Power Dissipation
Power dissipation in the MAX1536 is dominated by
conduction losses in the two internal power switches.
Power dissipation due to supply current in the control
section and average current used to charge and dis-
charge the gate capacitance of the internal switches
(i.e., switching losses—P SL ) is approximately:
P SL = C x V IN2 x f SW
where:
C = 5nF.
f SW = switching frequency.
The combined conduction losses (P CL ) in the two
power switches are approximated by:
P CL = I OUT2 x R PMOS
where:
I OUT = load current.
R PMOS = PMOS switch on-resistance.
where:
θ JA = junction-to-ambient thermal resistance.
T J(MAX) = maximum junction temperature = +150°C.
T A(MAX) = maximum ambient temperature.
Design Procedure
For typical applications, use the recommended compo-
nent values in Table 1. For other applications, take the
following steps:
1) Select the desired PWM-mode switching frequency.
See Figure 4 for maximum operating frequency.
2) Select the constant off-time as a function of input
voltage, output voltage, and switching frequency.
3) Select R TOFF as a function of off-time.
4) Select the inductor as a function of output voltage,
off-time, and peak-to-peak inductor current.
Setting the Output Voltage
Setting V OUT with a Resistive Voltage-Divider at FB
The MAX1536 output voltage (V OUT ) is set using FB
and REFIN (Figure 5). The MAX1536 regulates V FB to
be equal to V REFIN . Connect FB to a resistive voltage-
divider between V OUT and AGND to adjust V OUT from
+0.7V to V IN . Select an R B from 10k ? to 100k ? , then
calculate R A based on the desired V OUT :
1800
1600
V OUT = 1.5V
V OUT = 1.8V
( )
1400
V OUT = V FB 1 +
R A
R B
LX
V OUT = +2.5V
1200
1000
PGND
R A
2.49k ?
800
600
400
200
0
3.0
V OUT = 2.5V
3.5
V OUT = 3.3V
4.0
4.5
V OUT = 1.0V
NO LOAD
5.0
5.5
V REF = +2.0V
C REF
0.22 μ F
MAX1536
REF
REFIN AGND
FB
V FB = V REFIN
R B
10k ?
V IN (V)
Figure 4. Maximum Recommended Operating Frequency vs.
Input Voltage
Figure 5. Setting V OUT with a Resistive Voltage-Divider at FB
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1536EVKIT | 功能描述:直流/直流开关调节器 Evaluation Kit for the MAX1536 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1537AETX+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1537ETX | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1537ETX-T | 功能描述:电流和电力监控器、调节器 RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX1537EVKIT | 制造商:Maxim Integrated Products 功能描述:MAIN POWER SUPPLY CONTROLLER FOR NOTEBOOK - Bulk |
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