Rainbow-electronics MAX1637 Bedienungsanleitung Seite 1

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For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
General Description
The MAX1637 synchronous, buck, switch-mode power-
supply controller generates the CPU supply voltage in
battery-powered systems. The MAX1637 is a stripped-
down version of the MAX1636 in a smaller 16-pin QSOP
package. The MAX1637 is intended to be powered sep-
arately from the battery by an external bias supply (typi-
cally the +5V system supply) in applications where the
battery exceeds 5.5V. The MAX1637 achieves excellent
DC and AC output voltage accuracy. This device can
operate from a low input voltage (3.15V) and delivers the
excellent load-transient response needed by upcoming
generations of dynamic-clock CPUs.
Using synchronous rectification, the MAX1637 achieves
up to 95% efficiency. Efficiency is greater than 80%
over a 1000:1 load-current range, which extends bat-
tery life in system-suspend or standby mode. Excellent
dynamic response corrects output load transients
caused by the latest dynamic-clock CPUs within five
300kHz clock cycles. Powerful 1A on-board gate driv-
ers ensure fast external N-channel MOSFET switching.
The MAX1637 features a logic-controlled and synchro-
nizable, fixed-frequency, pulse-width-modulation
(PWM) operating mode. This reduces noise and RF
interference in sensitive mobile-communications and
pen-entry applications. Asserting the SKIP pin enables
fixed-frequency mode, for lowest noise under all load
conditions. For a stand-alone device that includes a
+5V VL linear regulator and low-dropout capabilities,
refer to the MAX1636 data sheet.
________________________Applications
Notebook Computers Subnotebook Computers
Handy-Terminals, PDAs
____________________________Features
±2% DC Accuracy
0.1% (typ) DC Load Regulation
Adjustable Switching Frequency to 350kHz
Idle Mode™ Pulse-Skipping Operation
1.10V to 5.5V Adjustable Output Voltage
3.15V Minimum IC Supply Voltage (at V
CC
pin)
Internal Digital Soft-Start
1.1V ±2% Reference Output
1µA Total Shutdown Current
Output Overvoltage Crowbar Protection
Output Undervoltage Shutdown (foldback)
Tiny 16-Pin QSOP Package
MAX1637
Miniature, Low-Voltage,
Precision Step-Down Controller
________________________________________________________________
Maxim Integrated Products
1
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
CSH SKIP
LX
DH
BST
PGND
DL
V
GG
V
CC
TOP VIEW
MAX1637
QSOP
CSL
FB
SHDN
CC
REF
SYNC
GND
__________________Pin Configuration
__________Typical Operating Circuit
19-1321; Rev 1; 2/98
PART
MAX1637EEE -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
16 QSOP
EVALUATION KIT
AVAILABLE
______________Ordering Information
Idle Mode is a trademark of Maxim Integrated Products.
MAX1637
SHDN
GND
V
BATT
V
BIAS
DL
PGND
LX
DH
V
CC
V
GG
BST
CSH
CSL
FB
SKIP
SYNC
REF
CC
OUTPUT
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Inhaltsverzeichnis

Seite 1 - Miniature, Low-Voltage

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.For small orders, phone 408-737-7600 ext. 3468.General

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller10 ______________________________________________________________________________________

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller______________________________________________________________________________________ 11

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller12 ______________________________________________________________________________________

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller______________________________________________________________________________________ 15

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller16 ______________________________________________________________________________________

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Rectifier Clamp Diode The rectifier is a clamp across the low-side MOSFETthat catches the negative inductor swing during the60ns dead time between tur

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MAX1637P(gate) = Qgx ƒ x VGGwhere Qgis the sum of the gate-charge values for low-side and high-side switches. For matched MOSFETs,Qgis twice the data-

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sensing at the supply’s output terminals without interfer-ence from IR drops and ground noise. Other high-cur-rent paths should also be minimized, but

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller2 _______________________________________________________________________________________

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MAX1637Miniature, Low-Voltage, Precision Step-Down ControllerMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller_______________________________________________________________________________________ 3

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010515200 3 41 2 5 6 87 9SUPPLY CURRENTvs. LOAD CURRENTMAX1637-07LOAD CURRENT (A)VCC + VGG SUPPLY CURRENT (mA)SYNC = HIGHSYNC = LOWSKIP = LOWMAX1637Mi

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller_______________________________________________________________________________________51

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller6 _______________________________________________________________________________________

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller_______________________________________________________________________________________ 7

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LOAD CURRENTMAX1637Miniature, Low-Voltage, Precision Step-Down Controller8 ___________________________________________________________________________

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MAX1637Miniature, Low-Voltage, Precision Step-Down Controller_______________________________________________________________________________________ 9

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