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参数资料
| 型号： | MAX5099ATJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 32TQFN |
| 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： | 2 |
| 输出电压： | 0.8 V ~ 17.1 V |
| 输入电压： | 4.5 V ~ 19 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz ~ 2.2MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
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Dual, 2.2MHz, Automotive Synchronous Buck
Converter with 80V Load-Dump Protection
Thermal-Overload Protection
During continuous short circuit or overload at the output,
the power dissipation in the IC can exceed its limit. The
input voltage is limited by the minimum on-time
(t ON(MIN) ):
MAX5099 provides thermal shutdown protection with
temperature hysteresis. Internal thermal shutdown is
provided to avoid irreversible damage to the device.
V IN ( MAX ) ≤
V OUT
t ON ( MIN ) × f SW
V IN ( MIN ) = ? OUT DROP 1 ? + V DROP 2 ? V DROP 1
When the die temperature exceeds +165°C (typ), an on-
chip thermal sensor shuts down the device, forcing the
internal switches to turn off, allowing the IC to cool. The
thermal sensor turns the part on again with soft-start
after the junction temperature cools by +20°C. During
thermal shutdown, both regulators shut down, PGOOD_
goes low, and soft-start resets. The internal 20V zener
clamp from IN_HIGH to SGND is not turned off during
thermal shutdown because this clamping action must
always be active.
Applications Information
Setting the Switching Frequency
The controller generates the clock signal by dividing
down the internal oscillator f OSC or the SYNC input sig-
nal when driven by an external oscillator. The switching
frequency equals half the internal oscillator frequency
(f SW = f OSC /2). The internal oscillator frequency is set
by a resistor (R OSC ) connected from OSC to SGND. To
find R OSC for each converter switching frequency f SW ,
use the formulas:
where t ON(MIN) is 100ns. The minimum input voltage is
limited by the maximum duty cycle (D MAX = 0.92):
? V + V ?
? D MAX ?
where V DROP1 is the total parasitic voltage drops in the
inductor discharge path, which includes the forward
voltage drop (V DS ) of the low-side n-channel MOSFET,
the series resistance of the inductor, and the PCB resis-
tance. V DROP2 is the total resistance in the charging
path that includes the on-resistance of the high-side
switch, the series resistance of the inductor, and the
PCB resistance.
Setting the Output Voltage
For 0.8V or greater output voltages, connect a voltage-
divider from OUT_ to FB_ to SGND (Figure 2). Select
RB (FB_ to SGND resistor) to between 1k Ω and 20k Ω .
Calculate R A (OUT_ to FB_ resistor) with the following
equation:
(
0 . 920 SW
f SW ( )
R A B ? ?
? ? 1 ?
? ? V OUT _ ? ?
R OSC ( k Ω ) =
10 . 721
MHz
f
≥ 1 . 25 MHz
)
= R
? ?
? ? V FB _ ? ?
(
0 . 973 SW
f SW ( MHz )
R OSC ( k Ω ) =
12 . 184
f
< 1 . 25 MHz
)
where V FB_ = 0.8V (see the Electrical Characteristics
table).
R A = R C ? FB _
A rising clock edge on SYNC is interpreted as a syn-
chronization input. If the SYNC signal is lost, the inter-
nal oscillator takes control of the switching rate,
returning the switching frequency to that set by R OSC .
When an external synchronization signal is used, R OSC
must be selected such that f SW = 1/2 f SYNC .
Buck Converter
Effective Input Voltage Range
Although the MAX5099 converter operates from input
supplies ranging from 5.2V to 19V, the input voltage
range can be effectively limited by the MAX5099 duty-
cycle limitations for a given output voltage. The maximum
For output voltages below 0.8V, set the MAX5099 out-
put voltage by connecting a voltage-divider from OUT_
to FB_ to BYPASS (Figure 2). Select RC (FB_ to
BYPASS resistor) higher than a 50k Ω range. Calculate
R A with the following equation:
? V ? V OUT _ ?
?
? ? V BYPASS ? V FB _ ? ?
where V FB_ = 0.8V, V BYPASS = 2V (see the Electrical
Characteristics table), and V OUT_ can range from 0V to
V FB_ .
______________________________________________________________________________________
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