Datasheet

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General Description

Maxim’s MAX630 and MAX4193 CMOS DC-DC regula-

tors are designed for simple, efficient, minimum-size

DC-DC converter circuits in the 5mW to 5W range. The

MAX630 and MAX4193 provide all control and power

handling functions in a compact 8-pin package: a

1.31V bandgap reference, an oscillator, a voltage com-

parator, and a 375mA N-channel output MOSFET. A

comparator is also provided for low-battery detection.

Operating current is only 70µA and is nearly indepen-

dent of output switch current or duty cycle. A logic-level

input shuts down the regulator to less than 1µA quies-

cent current. Low-current operation ensures high effi-

ciency even in low-power battery-operated systems.

The MAX630 and MAX4193 are compatible with most

battery voltages, operating from 2.0V to 16.5V.

The devices are pin compatible with the Raytheon bipo-

lar circuits, RC4191/2/3, while providing significantly

improved efficiency and low-voltage operation. Maxim

also manufactures the MAX631, MAX632, and MAX633

DC-DC converters, which reduce the external compo-

nent count in fixed-output 5V, 12V, and 15V circuits.

See Table 2 at the end of this data sheet for a summary

of other Maxim DC-DC converters.

Applications

+5V to +15V DC-DC Converters

High-Efficiency Battery-Powered DC-DC

Converters

+3V to +5V DC-DC Converters

9V Battery Life Extension

Uninterruptible 5V Power Supplies

5mW to 5W Switch-Mode Power Supplies

Features

♦ High Efficiency—85% (typ)

♦ 70µA Typical Operating Current

♦ 1µA Maximum Quiescent Current

♦ 2.0V to 16.5V Operation

♦ 525mA (Peak) Onboard Drive Capability

♦ ±1.5% Output Voltage Accuracy (MAX630)

♦ Low-Battery Detector

♦ Compact 8-Pin Mini-DIP and SO Packages

♦ Pin Compatible with RC4191/2/3

MAX630/MAX4193

CMOS Micropower Step-Up

Switching Regulator

________________________________________________________________ Maxim Integrated Products 1

GND

LBD

LBR

TOP VIEW

MAX630

MAX4193

Pin Configuration

Ordering Information

MAX630

+5V IN

470μH

+15V

OUT

47pF

LBD

LBR

GND

+5 TO +15V CONVERTER

PART TEMP RANGE

PIN-

PACKAGE

MAX630CPA 0°C to +70°C 8 PDIP

MAX630CSA 0°C to +70°C 8 SO

MAX630CJA 0°C to +70°C 8 CERDIP

MAX630EPA -40°C to +85°C 8 PDIP

MAX630ESA -40°C to +85°C 8 SO

MAX630EJA -40°C to +85°C 8 CERDIP

MAX630MJA -55°C to +125°C 8 CERDIP**

MAX630MSA/PR -55°C to +125°C 8 SO†

M AX 630M S A/P R- T -55°C to +125°C 8 SO†

MAX4193C/D 0°C to +70°C Dice*

MAX4193CPA 0°C to +70°C 8 PDIP

MAX4193CSA 0°C to +70°C 8 SO

MAX4193CJA 0°C to +70°C 8 CERDIP

MAX4193EPA -40°C to +85°C 8 PDIP

MAX4193ESA -40°C to +85°C 8 SO

MAX4193EJA -40°C to +85°C 8 CERDIP

MAX4193MJA -55°C to +125°C 8 CERDIP**

Typical Operating Circuit

19-0915; Rev 2; 9/08

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

*Dice are specified at T

= +25°C. Contact factory for dice

specifications.

**Contact factory for availability and processing to MIL-STD-883.

†Contact factory for availibility.

Summary of content (14 pages)

PAGE 1
9-0915; Rev 2; 9/08 CMOS Micropower Step-Up Switching Regulator Maxim’s MAX630 and MAX4193 CMOS DC-DC regulators are designed for simple, efficient, minimum-size DC-DC converter circuits in the 5mW to 5W range. The MAX630 and MAX4193 provide all control and power handling functions in a compact 8-pin package: a 1.31V bandgap reference, an oscillator, a voltage comparator, and a 375mA N-channel output MOSFET. A comparator is also provided for low-battery detection.
PAGE 2
MAX630/MAX4193 CMOS Micropower Step-Up Switching Regulator ABSOLUTE MAXIMUM RATINGS Supply Voltage .......................................................................18V Storage Temperature Range ............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C Operating Temperature Range MAX630C, MAX4193C........................................0°C to +70°C MAX630E, MAX4193E .....................................-40°C to +85°C MAX630M, MAX4193M........
PAGE 3
CMOS Micropower Step-Up Switching Regulator (+VS = +6.0V, TA = Full Operating Temperature Range, IC = 5.0µA, unless otherwise noted.) PARAMETER SYMBOL Supply Voltage +VS Internal Reference Voltage VREF MAX630 CONDITIONS MIN TYP 2.2 MIN 16.5 3.5 1.20 TYP MAX UNITS 16.5 V 1.31 1.37 1.31 1.42 V I3 = 0mA 70 200 90 300 µA Line Regulation 0.5V0UT < VS < V0UT (Note 1) 0.2 0.5 0.5 1.0 % VOUT Load Regulation VS = 0.5V0, PL = 0 to 150mW (Note 1) 0.5 1.0 0.5 1.
PAGE 4
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193 Pin Description PIN NAME FUNCTION Low-Battery Detection Comparator Input. The LBD output, pin 8, sinks current whenever this pin is below the low-battery detector threshold, typically 1.31V. 1 LBR 2 CX An external capacitor connected between this terminal and ground sets the oscillator frequency. 47pF = 40 kHz. 3 LX This pin drives the external inductor.
PAGE 5
CMOS Micropower Step-Up Switching Regulator MAX630/MAX4193 LOW BATTERY INPUT +5V INPUT R3 169kΩ LBD 8 MAX630 1 LBR R4 100kΩ LOW-BATTERY OUTPUT (LOW IF INPUT < 3V) COMP 2 1.31V L1 470 2 CX OSC 40kHz R2 47.5kΩ VFB 7 R1 499kΩ COMP 1 CC 3 LX D1 1N4148 SHUTDOWN IC 6 RON ≅ 3Ω OPERATE 1.31V 4 GND BANDGAP REFERENCE AND BIAS GENERATOR +VS 5 C1 470μF 25V +15V OUTPUT 20mA Figure 1.
PAGE 6
MAX630/MAX4193 CMOS Micropower Step-Up Switching Regulator External Components Resistors Since the LBR and VFB input bias currents are specified as 10nA (max), the current in the dividers R1/R2 and R3/R4 (Figure 1) may be as low as 1µA without significantly affecting accuracy. Normally R2 and R4 are between 10kΩ and 1MΩ, which sets the current in the voltage-dividers in the 1.3µA to 130µA range. R1 and R3 can then be calculated as follows: V −1.31V 10Ω ≤ R2 ≤ 1MΩ R1 = R2 x OUT 1.31 V −1.
PAGE 7
CMOS Micropower Step-Up Switching Regulator Ferrite Cores (Pot Cores) Pot cores are very popular as switch-mode inductors since they offer high performance and ease of design. The coils are generally wound on a plastic bobbin, which is then placed between two pot core sections. A simple clip to hold the core sections together completes the inductor. Smaller pot cores mount directly onto PC boards through the bobbin terminals.
PAGE 8
MAX630/MAX4193 CMOS Micropower Step-Up Switching Regulator Filter Capacitor The output-voltage ripple has two components, with approximately 90 degrees phase difference between them. One component is created by the change in the capacitor’s stored charge with each output pulse. The other ripple component is the product of the capacitor’s charge/discharge current and its effective series resistance (ESR).
PAGE 9
CMOS Micropower Step-Up Switching Regulator Typical Applications +5V to +15V DC-DC Converter Figure 1 shows a simple circuit that generates +15V at approximately 20mA from a +5V input. The MAX630 has a ±1.5% reference accuracy, so the output voltage has an untrimmed accuracy of ±3.5% if R1 and R2 are 1% resistors. Other output voltages can also be selected by changing the feedback resistors. Capacitor CX sets the oscillator frequency (47pF = 40kHz), while C1 limits output ripple to about 50mV.
PAGE 10
MAX630/MAX4193 CMOS Micropower Step-Up Switching Regulator +3V Battery to +5V DC-DC Converter A common power-supply requirement involves conversion of a 2.4V or 3V battery voltage to a 5V logic supply. The circuit in Figure 5 converts 3V to 5V at 40mA with 85% efficiency. When IC (pin 6) is driven low, the output voltage will be the battery voltage minus the drop across diode D1. The optional circuitry using C1, R3, and R4 lowers the oscillator frequency when the battery voltage falls to 2.0V.
PAGE 11
CMOS Micropower Step-Up Switching Regulator output from a 9V battery. The reference for the -15V output is derived from the positive output through R3 and R4. Both regulators are set to maximize output power at low-battery voltage by reducing the oscillator frequency, through LBR, when VBATT falls to 7.2V.
PAGE 12
MAX630/MAX4193 CMOS Micropower Step-Up Switching Regulator R3 100kΩ R4 100kΩ INPUT, 9V BATTERY IN914 500μH 1N914 NEG OUT -12V, 15mA POS OUT +12V, 45mA 330μF N.C. 150μF 250μH 5 8 7 6 LX VFB VREF +VS GND 6 4 R5 100kΩ MAX634 4 LBD 2 CX 3 150pF 68pF 5 +VS 3 LX 7 VFB IC GND CX 2 R2 10kΩ MAX630 LBD 8 R1 82kΩ LBR 1 100pF R6 18kΩ 47pF Figure 8. ±12V Dual-Tracking Regulator Table 2. Maxim DC-DC Converters DEVICE DESCRIPTION INPUT VOLTAGE OUTPUT VOLTAGE 1.
PAGE 13
CMOS Micropower Step-Up Switching Regulator For the latest package outline information, go to www.maxim-ic.com/packages. LBR 1 7 6 CX VFB PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 8 PDIP P8-T 21-0043 8 SO S8-4 21-0041 8 CERDIP J8-2 21-0045 IC 2 0.089" (2.26mm) LX 3 5 4 4 GND GND +VS 0.070" (1.
PAGE 14
MAX630/MAX4193 CMOS Micropower Step-Up Switching Regulator Revision History REVISION NUMBER REVISION DATE 2 9/08 DESCRIPTION Added information for rugged plastic product PAGES CHANGED 1 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.