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MAX1636EAP 参数 Datasheet PDF下载

MAX1636EAP图片预览
型号: MAX1636EAP
PDF下载: 下载PDF文件 查看货源
内容描述: 低电压,高精度降压型控制器,用于便携式CPU电源 [Low-Voltage, Precision Step-Down Controller for Portable CPU Power]
分类和应用: 控制器便携式
文件页数/大小: 24 页 / 220 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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Lo w -Vo lt a g e , P re c is io n S t e p -Do w n  
Co n t ro lle r fo r P o rt a b le CP U P o w e r  
______________________________________________________________P in De s c rip t io n  
PIN  
1
NAME  
CSH  
FUNCTION  
Current-Sense Input, High Side  
2
CSL  
Current-Sense Input, Low Side. Also serves as a feedback input in fixed output modes.  
Timed Reset Output. Low for at least 100ms after output voltage is valid, then goes high impedance  
(open drain).  
3
RESET  
MAX136  
4
5
6
Shutdown Control Input. Puts chip in shutdown or standby mode, depending on OVP (Table 5).  
SHDN  
OVP  
CC  
Overvoltage Protection Enable/Disable. Tie to GND to disable OVP; tie to V to enable OVP.  
CC  
Compensation pin. Connect a small capacitor to GND to set the integration time constant.  
1.100V Reference Output. Capable of sourcing 50µA for external loads; bypass with a 0.22µF  
(min) capacitor.  
7
REF  
Oscillator Frequency Select and Synchronization Input. Tie to V for 300kHz operation; tie to GND for  
CC  
200kHz operation.  
8
SYNC  
GND  
FB  
9, 10  
11  
Analog Ground  
Feedback Input. Tie to GND for fixed 3.3V output; tie to V for fixed 2.5V output; tie to resistor divider for  
CC  
adjustable mode.  
Main Supply Voltage Input. Powers the PWM controller, logic, and reference. Input range is +3.15V to  
+5.5V.  
12  
13  
V
CC  
5V VL Linear-Regulator Input. The VL linear regulator automatically shuts off if V+ is left open or shorted to  
V . Bypass V+ to GND with a 0.1µF capacitor close to the IC.  
L
V+  
14  
15  
16  
17  
18  
19  
20  
VL  
DL  
5V Linear-Regulator Output. Powers the DL low-side gate driver. Bypass with a 2.2µF (min) capacitor.  
Low-Side Gate-Driver Output  
PGND  
BST  
DH  
Power Ground  
Boost-Capacitor Connection  
High-Side Gate-Driver Output  
LX  
Inductor Connection  
Low-Noise Mode Control. Forces fixed-frequency PWM operation when high.  
SKIP  
first recalculating component values (particularly induc-  
______S t a n d a rd Ap p lic a t io n Circ u it  
tance value at maximum battery voltage). Adding a  
Sc hottky re c tifie r a c ros s the s ync hronous re c tifie r  
improves circuit efficiency by approximately 1%. This  
rectifier is otherwise not needed because the MOSFET  
required typically incorporates a high-speed silicon  
diode from drain to source. Use a Schottky rectifier  
rated at a DC current equal to at least one-third of the  
load current.  
The basic MAX1636 buck converter (Figure 1) is easily  
adapted to meet a wide range of applications with  
inp uts up to 30V b y s ub s tituting c omp one nts from  
Table 1. These circuits represent a good set of trade-  
offs between cost, size, and efficiency, while staying  
within the worst-case specification limits for stress-  
related parameters, such as capacitor ripple current.  
Do not change the circuits switching frequency without  
8
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