Rainbow-electronics MAX1635 Manuel d'utilisateur

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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 MAX1630–MAX1635 are buck-topology, step-down,
switch-mode, power-supply controllers that generate
logic-supply voltages in battery-powered systems. These
high-performance, dual/triple-output devices include on-
board power-up sequencing, power-good signaling with
delay, digital soft-start, secondary winding control, low-
dropout circuitry, internal frequency-compensation net-
works, and automatic bootstrapping.
Up to 96% efficiency is achieved through synchronous
rectification and Maxim’s proprietary Idle Mode™ control
scheme. Efficiency is greater than 80% over a 1000:1
load-current range, which extends battery 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.
Strong 1A on-board gate drivers ensure fast external
N-channel MOSFET switching.
These devices feature a logic-controlled and synchroniz-
able, fixed-frequency, pulse-width-modulation (PWM)
operating mode. This reduces noise and RF interference
in sensitive mobile communications and pen-entry appli-
cations. Asserting the
SKIP pin enables fixed-frequency
mode, for lowest noise under all load conditions.
The MAX1630–MAX1635 include two PWM regulators,
adjustable from 2.5V to 5.5V with fixed 5.0V and 3.3V
modes. All these devices include secondary feedback
regulation, and the MAX1630/MAX1632/MAX1633/
MAX1635 each contain 12V/120mA linear regulators. The
MAX1631/MAX1634 include a secondary feedback input
(SECFB), plus a control pin (STEER) that selects which
PWM (3.3V or 5V) receives the secondary feedback sig-
nal. SECFB provides a method for adjusting the sec-
ondary winding voltage regulation point with an external
resistor divider, and is intended to aid in creating auxiliary
voltages other than fixed 12V.
The MAX1630/MAX1631/MAX1632 contain internal out-
put overvoltage and undervoltage protection features.
________________________Applications
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Desktop CPU Local DC-DC Converters
____________________________Features
96% Efficiency
+4.2V to +30V Input Range
2.5V to 5.5V Dual Adjustable Outputs
Selectable 3.3V and 5V Fixed or Adjustable
Outputs (Dual Mode™)
12V Linear Regulator
Adjustable Secondary Feedback
(MAX1631/MAX1634)
5V/50mA Linear Regulator Output
Precision 2.5V Reference Output
Programmable Power-Up Sequencing
Power-Good (RESET) Output
Output Overvoltage Protection
(MAX1630/MAX1631/MAX1632)
Output Undervoltage Shutdown
(MAX1630/MAX1631/MAX1632)
200kHz/300kHz Low-Noise, Fixed-Frequency
Operation
Low-Dropout, 99% Duty-Factor Operation
2.5mW Typical Quiescent Power (+12V input, both
SMPSs on)
4µA Typical Shutdown Current
28-Pin SSOP Package
MAX1630–MAX1635
Multi-Output, Low-Noise Power-Supply
Controllers for Notebook Computers
________________________________________________________________
Maxim Integrated Products
1
5V
LINEAR
12V
LINEAR
POWER-UP
SEQUENCE
POWER-
GOOD
3.3V
SMPS
5V
SMPS
RESETON/OFF
+5V (RTC)
+3.3V
INPUT
+5V
+12V
________________Functional Diagram
19-0480; Rev 3; 4/97
PART
MAX1630CAI
MAX1630EAI -40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
28 SSOP
28 SSOP
EVALUATION KIT
AVAILABLE
_______________Ordering Information
Ordering Information continued on last page.
Pin Configurations and Selector Guide appear at end of data
sheet.
Idle Mode and Dual Mode are trademarks of Maxim Integrated
Products.
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Résumé du contenu

Page 1 - MAX1630–MAX1635

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.________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers10 ______________________________________________________________

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_______________Detailed DescriptionThe MAX1630 is a dual, BiCMOS, switch-mode power-supply controller designed primarily for buck-topologyregulators i

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers12 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers14 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers16 ______________________________________________________________

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Remote output-voltage sensing, while not possible infixed-output mode due to the combined nature of thevoltage-sense and current-sense inputs (CSL3 an

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers18 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers2 _______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers20 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers22 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers24 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers26 ______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook ComputersMaxim cannot assume responsibility for use of any circuitry other

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers4 _______________________________________________________________

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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__________________________________________________________________________Pin DescriptionMAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyController

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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_______Standard Application CircuitThe basic MAX1631/MAX1634 dual-output 3.3V/5Vbuck converter (Figure 1) is easily adapted to meet awide range of app

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MAX1630–MAX1635Multi-Output, Low-Noise Power-SupplyControllers for Notebook Computers_________________________________________________________________

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