IC REG PWM STEP-DWN ADJ 8-SOIC

 

MAX750ACSA+

Manufacturer Part NumberMAX750ACSA+
DescriptionIC REG PWM STEP-DWN ADJ 8-SOIC
ManufacturerMaxim Integrated Products
TypeStep-Down (Buck), PWM - Current Mode
MAX750ACSA+ datasheets

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Specifications of MAX750ACSA+

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - Output1.25 ~ 11 V
Current - Output450mAFrequency - Switching170kHz
Voltage - Input4 ~ 11 VOperating Temperature0°C ~ 70°C
Mounting TypeSurface MountPackage / Case8-SOIC (3.9mm Width)
Voltage - Supply4 V ~ 11 VFrequency-max210kHz
Duty Cycle92%Pwm TypeCurrent Mode
BuckYesBoostNo
FlybackNoInvertingNo
DoublerNoDividerNo
CukNoIsolatedNo
Lead Free Status / RoHS StatusLead free / RoHS Compliant  
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19-0195; Rev 0; 10/93
_______________General Description
The MAX750A/MAX758A are adjustable-output, CMOS,
step-down, DC-DC switching regulators.
MAX758A accepts inputs from 4V to 16V and delivers
750mA, while the MAX750A accepts inputs from 4V to
11V and delivers 450mA. Typical efficiencies are 85%
to 90%. Typical quiescent current is 1.7mA, or only
6µA in shutdown mode. The output does not exhibit
any ripple at subharmonics of the switching frequency
over its specified range.
Pulse-width-modulation (PWM) current-mode control
provides precise output regulation and excellent tran-
sient responses. Output voltage accuracy is guaran-
teed to be ±4.5% plus feedback-resistor tolerance over
line, load, and temperature variations. Fixed-frequency
switching and absence of subharmonic ripple allows
easy filtering of output ripple and noise, as well as the
use of small external components. These regulators
require only a single inductor value to work in most
applications, so no inductor design is necessary.
________________________Applications
Cellular Phones & Radios
Portable Communications Equipment
Portable Instruments
Computer Peripherals
_________________Pin Configurations
TOP VIEW
SHDN
1
8
REF
2
7
MAX750A
SS
3
6
MAX758A
CC
4
5
DIP
1
SHDN
8
REF
2
7
MAX750A
3
SS
6
4
CC
5
SO
Pin Configurations continued on last page.
________________________________________________________________ Maxim Integrated Products
Call toll free 1-800-998-8800 for free samples or literature.
Adjustable, Step-Down,
Current-Mode PWM Regulators
____________________________Features
Up to 750mA Load Currents
The
160kHz High-Frequency, Current-Mode PWM
85% to 96% Efficiencies
33µH or 100µH Pre-Selected Inductor Value,
No Component Design Required
1.7mA Quiescent Supply Current
6µA Shutdown Supply Current
Adjustable Output Voltage
Overcurrent, Soft-Start, and Undervoltage
Lockout Protection
Cycle-by-Cycle Current Limiting
8-Pin DIP/SO Packages (MAX750A)
______________Ordering Information
PART
MAX750ACPA
MAX750ACSA
MAX750AC/D
MAX750AEPA
MAX750AESA
MAX750AMJA
Ordering Information continued on last page.
* Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit
INPUT
4V TO 16V
V+
LX
GND
I.C.
ON/OFF
SHDN
V+
LX
REF
GND
SS
I.C.
TEMP. RANGE
PIN-PACKAGE
0°C to +70°C
8 Plastic DIP
0°C to +70°C
8 SO
0°C to +70°C
Dice*
-40°C to +85°C
8 Plastic DIP
-40°C to +85°C
8 SO
-55°C to +125°C
8 CERDIP**
OUTPUT ADJ.
FROM
V+
33µH
VREF TO V+
LX
MAX750A
MAX758A
CC
GND
1

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MAX750ACSA+ Summary of contents

  • Page 1

    ... MAX750A Pin Configurations continued on last page. ________________________________________________________________ Maxim Integrated Products Call toll free 1-800-998-8800 for free samples or literature. Adjustable, Step-Down, Current-Mode PWM Regulators ____________________________Features Up to 750mA Load Currents The 160kHz High-Frequency, Current-Mode PWM 85% to 96% Efficiencies 33µH or 100µH Pre-Selected Inductor Value, No Component Design Required 1 ...

  • Page 2

    Adjustable, Step-Down, Current-Mode PWM Regulators ABSOLUTE MAXIMUM RATINGS Pin Voltages V+ (MAX750A).........................................................+12V, -0.3V V+ (MAX758A).........................................................+18V, -0.3V LX (MAX750A) ....................................(V+ - 12V) to (V+ + 0.3V) LX (MAX758A) ....................................(V+ - 21V) to (V+ + 0.3V) SS, CC, SHDN.............................................-0.3V to (V+ + ...

  • Page 3

    ELECTRICAL CHARACTERISTICS (continued) (Circuit of Figure for the MAX750A 12V for the MAX758A unless otherwise noted.) A MIN MAX PARAMETER CONDITIONS V+ rising Undervoltage Lockout V+ falling ...

  • Page 4

    Adjustable, Step-Down, Current-Mode PWM Regulators _____________________________Typical Operating Characteristics (continued) (Circuit of Figure 5V +25°C, unless otherwise noted.) OUT A MAX758A PEAK INDUCTOR CURRENT vs. OUTPUT CURRENT 1000 L1 = 100µ 300µF 800 600 ...

  • Page 5

    Operating Characteristics (continued) (Circuit of Figure 5V +25°C, unless otherwise noted.) OUT A MAXIMUM OUTPUT CURRENT vs. SUPPLY VOLTAGE 1400 (NOTES 3, 6) 1200 1000 MAX750A 800 SUPPLY VOLTAGE ...

  • Page 6

    Adjustable, Step-Down, Current-Mode PWM Regulators _____________________________Typical Operating Characteristics (continued) (Circuit of Figure 5V +25°C, unless otherwise noted.) OUT A MAX750A LINE-TRANSIENT RESPONSE 100ms/div A: V OUT , 50mV/div, AC-COUPLED B: V+, 5V/div, 6.0V TO 11.0V ...

  • Page 7

    Description PIN 8-PIN 16-PIN NAME DIP/SO WIDE SO Shutdown—active low. Ground to power-down chip, tie to V+ for normal operation. SHDN 1 2 Output voltage falls to 0V when SHDN is low. Reference Voltage Output (+1.22V) supplies up to ...

  • Page 8

    Adjustable, Step-Down, Current-Mode PWM Regulators SHDN BIAS GEN MAX750A MAX758A C5 330pF R2 ERROR AMP 1.23V 510K BANDGAP REF C6 1M 0.01µF ±35 0.1µF * SEE TABLE 3 FOR COMPONENT VALUES AND SUPPLIERS. Figure 1. ...

  • Page 9

    FROM SHDN MAX750A MAX758A R1 510k SS CLAMP SS 1M ±35% C1 1.23V Figure 2. Block Diagram of Soft-Start Circuitry tors’ leakage currents rises sharply. The actual design limit for standby current is much less than the 100µA specified in ...

  • Page 10

    Adjustable, Step-Down, Current-Mode PWM Regulators Table 1. Typical Soft-Start Times MAX750A CIRCUIT CONDITIONS R1 (kΩ) V+ (V) I (mA) OUT 510 6 0 510 9 0 510 11 0 510 9 150 510 9 300 510 9 150 510 9 ...

  • Page 11

    MAX750A: 4.0V TO 11.0V MAX758A: 4.0V TO 16. SHDN LX MAX750A R1 MAX758A I.C. 510k GND REF 0.1µF 0.01µF PART MAX750A MAX758A NOTE: PIN NUMBERS REFER TO 8-PIN PACKAGES. * ...

  • Page 12

    Adjustable, Step-Down, Current-Mode PWM Regulators Table 2. Component Values and Suppliers MAX750AC/MAX758AC ASSEMBLY COMMERCIAL TEMPERATURE RANGE METHOD INDUCTORS L1 = 33µH to 100µH Sumida (708) 956-0666 CD54-101KC (MAX750AC) Surface CD105-101KC Mount (MAX758AC) Coiltronics (305) 781-8900 CTX100 series L1 = 33µH ...

  • Page 13

    Figure 4. DIP PC Layout, Through-Hole Component Placement Diagram (1x Scale) Figure 6. DIP PC Layout, Solder Side (1x Scale) ______________________________________________________________________________________ Adjustable, Step-Down, Current-Mode PWM Regulators Figure 5. DIP PC Layout, Component Side (1x Scale) Figure 7. DIP PC Layout, ...

  • Page 14

    Adjustable, Step-Down, Current-Mode PWM Regulators ____Pin Configurations (continued) TOP VIEW SHDN 2 15 REF 3 14 N.C. MAX758A Wide SO ___________________________________________________________Chip Topographies MAX750A ...

  • Page 15

    Information 0.127mm 0.004in ______________________________________________________________________________________ Adjustable, Step-Down, Current-Mode PWM Regulators 45˚ INCHES ...

  • Page 16

    ... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 1993 Maxim Integrated Products h x 45˚ ...

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