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| 型号： | MAX1897ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 20-TQFN |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | 0°C ~ 85°C |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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Quick-PWM Slave Controllers for
Multiphase, Step-Down Supplies
Pin Description (continued)
MAX1887
12
13
PIN
MAX1897
14
15
NAME
DH
LX
DESCRIPTION
High-Side Gate-Driver Output. DH swings from LX to BST.
Inductor Connection. Connect LX to the switched side of the inductor. LX serves as
the lower supply rail for the DH high-side gate driver.
Boost Flying-Capacitor Connection. Connect to an external capacitor and diode
14
16
BST
according to the Standard Application Circuit (Figure 1). An optional resistor in
series with BST allows DH pullup current to be adjusted.
Battery Voltage Sense Connection. Connect V+ to the input power source. V+ is
15
17
V+
used only for PWM one-shot timing (see the On-Time Control and Active Current
Balancing section).
Open-Drain Current-Limit Output. Connect to the master controller ’ s adjustable current-
16
18
LIMIT
limit input (ILIM) according to the Standard Application Circuit (Figure 1). When the
voltage across the master controller ’ s current-sense resistor (V CM+ - V CM- ) exceeds the
current-limit threshold (V ILIM /10), the MAX1887/MAX1897 pulls LIMIT low.
Table 1. Component Selection for Standard
Applications
Detailed Description
The MAX1887/MAX1897 step-down slave controllers
are intended for low-voltage, high-current, multiphase
COMPONENT
Output Voltage
Input Voltage Range
Maximum Load Current
Inductor (each phase)
Frequency
High-Side MOSFET
(N H , each phase)
Low-Side MOSFET
(N L , each phase)
Input Capacitor (C IN )
Output Capacitor (C OUT )
Current-Sense Resistors
(R CS and R CM )
Voltage Positioning Gain
(A VPS )
CIRCUIT OF FIGURE 1
0.6V to 1.75V
7V to 24V
40A
0.6μH
Sumida CDEP134H-0R6 or
Panasonic ETQP6F0R6BFA
300kHz (TON = float)
International Rectifier
(2) IRF7811W
International Rectifier
(2) IRF7822 or
Fairchild (3) FDS7764A or
(6) 10μF 25V
Taiyo Yuden
TMK432BJ106KM or
TDK C4532X5R1E106M
(8) 270μF 2V
Panasonic EEFUE0E271R
1.5m ?
2
DC-to-DC applications. The MAX1887/MAX1897 slave
controllers can be combined with any of Maxim ’ s
Quick-PWM step-down controllers to form a multiphase
DC-to-DC converter. When compared to single-phase
operation, multiphase conversion lowers the peak
inductor current by distributing the load current
between parallel power paths. This simplifies compo-
nent selection, power distribution to the load, and ther-
mal layout. Existing Quick-PWM controllers, such as the
MAX1718, function as the master controller, providing
accurate output voltage regulation, fast transient
response, and multiple fault protection features.
Synchronized to the master ’ s low-side gate driver, the
MAX1887/MAX1897 include a constant on-time con-
troller, synchronous rectifier gate drive, active current
balancing, and precision current-limit circuitry.
On-Time Control and Active
Current Balancing
The MAX1887/MAX1897 slave controller uses a con-
stant on-time, voltage feed-forward architecture similar
to Maxim ’ s Quick-PWM controllers (Figure 2). The con-
trol algorithm is simple: the high-side switch on-time is
determined solely by a one-shot whose period is
inversely proportional to input voltage and directly pro-
portional to the compensation voltage (V COMP ).
Another one-shot sets a minimum off-time (130ns typi-
cal). The on-time one-shot is triggered when the follow-
ing conditions are satisfied: The slave detects a
______________________________________________________________________________________
11
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