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参数资料
| 型号： | MAX1639ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/13页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.2MHz |
| 占空比： | 84% |
| 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： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
High-Speed Step-Down Controller with
Synchronous Rectification for CPU Power
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
BST
PWROK
CSL
CSH
V CC
REF
AGND
FB
CC1
CC2
FREQ
V DD
DL
PGND
LX
DH
FUNCTION
Boost-Capacitor Bypass for High-Side MOSFET Gate Drive. Connect a 0.1μF capacitor and low-leak-
age Schottky diode as a bootstrapped charge-pump circuit to derive a 5V gate drive from V DD for DH.
Open-Drain Logic Output. PWROK is high when the voltage on FB is within +8% and -6% of its set-
point.
Current-Sense Amplifier’s Inverting Input. Place the current-sense resistor very close to the controller IC,
and use a Kelvin connection.
Current-Sense Amplifier’s Noninverting Input
Analog Supply Input, 5V. Use an RC filter network, as shown in Figure 1.
Reference Output, 3.5V. Bypass REF to AGND with 0.1μF (min). Sources up to 100μA for external
loads. Force REF below 2V to turn off the controller.
Analog Ground
Voltage-Feedback Input. The voltage at this input is regulated to 1.100V.
Fast-Loop Compensation Capacitor Input. Connect a ceramic capacitor and resistor in series from
CC1 to AGND. See the section Compensating the Feedback Loop .
Slow-Loop Compensation Capacitor Input. Connect a ceramic capacitor from CC2 to AGND. See the
section Compensating the Feedback Loop.
Frequency-Select Input. FREQ = V CC : 1MHz
FREQ = REF: 600kHz
FREQ = AGND: 300kHz
Power Input for MOSFET Drivers, 5V. Bypass V DD to PGND within 0.2 in. (5mm) of the V DD pin using a
0.1μF capacitor and 4.7μF capacitor connected in parallel.
Low-Side Synchronous Rectifier Gate-Drive Output. DL swings between PGND and V DD . See the
section BST High-Side Gate-Driver Supply and MOSFET Drivers .
Power Ground
Switching Node. Connect LX to the high-side MOSFET source and inductor.
High-Side Main MOSFET Switch Gate-Drive Output. DH is a floating driver output that swings from LX
to BST, riding on the LX switching-node voltage. See the section BST High-Side Gate-Driver Supply
and MOSFET Drivers .
_______________________________________________________________________________________
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