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参数资料
| 型号： | MAX5073ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/25页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST ADJ 1A/2A 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），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 28 V |
| 输入电压： | 4.5 V ~ 23 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： | 无 |
| 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） |
2.2MHz, Dual-Output Buck or Boost Converter
with Internal Power MOSFETs
Input Capacitor
The input current for the boost converter is continuous
and the RMS ripple current at the input is low. Calculate
the capacitor value and ESR of the input capacitor
using the following equations.
the following equations to calculate the RMS current,
DC loss, and switching loss of each converter. The
MAX5073 device is available in a thermally enhanced
package and can dissipate up to 2.7W at +70°C ambient
temperature. The total power dissipation in the package
C IN =
? I L × D
4 × f SW × ? V Q
must be limited so the junction temperature does
not exceed its absolute maximum rating of +150°C at
maximum ambient temperature.
For the buck converter:
I RMS DC PK DC PK )) × MAX
ESR =
? V ESR
? I L
= ( I +I +(I × I
2 2 D
3
where
? I L =
( V IN ? V DS ) × D
L × f SW
where
P DC = I 2 RMS × R DS(ON)MAX
where V DS is the total voltage drop across the internal
MOSFET plus the voltage drop across the inductor
ESR. ? I L is the peak-to-peak inductor ripple current as
I DC = I O ?
? I L
2
calculated above. ? V Q is the portion of input ripple due
to the capacitor discharge and ? V ESR is the contribu-
tion due to ESR of the capacitor.
I PK = I O +
? I L
2
P SW = INMAX O R F SW
? V ESR
I RMS DC PK DC PK )) × MAX
C OUT = O MAX
I IN = O O
Output Capacitor
For the boost converter, the output capacitor supplies
the load current when the main switch is ON. The
required output capacitance is high, especially at high-
er duty cycles. Also, the output capacitor ESR needs to
be low enough to minimize the voltage drop due to the
ESR while supporting the load current. Use the follow-
ing equation to calculate the output capacitor for a
specified output ripple tolerance.
ESR =
I O
I × D
? V Q × f SW
See the Electrical Characteristics table for the
R DS(ON)MAX value.
V × I × ( t + t ) × f
4
For the boost converter:
2 2 D
= ( I +I +(I × I
3
V × I
V IN × η
I O is the load current, ? V Q is the portion of the ripple
due to the capacitor discharge and ? V ESR is the contri-
bution due to the ESR of the capacitor. D MAX is the
? I L =
( V IN ? V DS ) × D
L × f SW
maximum duty cycle at minimum input voltage.
Power Dissipation
The MAX5073 includes a high-frequency, low R DS_ON
switching MOSFET. At +85°C, the R DS_ON of the inter-
nal switch for converter 1 and converter 2 are 290m ?
and 630m ? , respectively. The DC loss is a function of
the RMS current in the switch while the switching loss is
a function of switching frequency and input voltage. Use
I DC = I IN ?
I PK = I IN +
? I L
2
? I L
2
18
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