Rainbow Electronics MAX711 User Manual

_______________General Description

The MAX710/MAX711 integrate a step-up DC-DC converter with a linear regulator to provide step-up/down voltage conversion. They are optimized for battery applications where the input varies above and below the regulated output voltage. They have an input range from +1.8V to +11V. Typical efficiency when boosting battery inputs is 85%.

The MAX710/MAX711 can be configured for minimum noise or optimum efficiency. Shutdown control turns off the part completely, disconnecting the input from the output (I

SHDN

= 0.2µA). Standby control turns off only the step-up converter and leaves the low-power linear regulator active (IQ= 7µA).

The MAX710 has a preset 3.3V or 5V output voltage. The MAX711 has an adjustable output that can be set from +2.7V to +5.5V with two resistors. Both devices come in 16-pin narrow SO packages.

________________________Applications

Single-Cell, Lithium-Powered Portable Devices Digital Cameras 2- to 4-Cell AA Alkaline Hand-Held Equipment

3.3V and Other Low-Voltage Systems 2-, 3-, and 4-Cell Battery-Powered Equipment Battery-Powered Devices with AC Input Adapters

____________________________Features

♦ Step-Up/Down Voltage Conversion ♦ +1.8V to +11V Input Range ♦ Output:

5V/250mA at V

= 1.8V

5V/500mA at VIN= 3.6V

♦ No External FETs Required ♦ Load Disconnected from Input in Shutdown ♦ Battery Drain:

200µA No-Load (V

= 4V)

7µA in Standby

0.2µA when Off

♦ Low-Noise and High-Efficiency Modes

MAX710/MAX711

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

________________________________________________________________

Maxim Integrated Products

16 15 14 13 12 11 10

1 2 3 4 5 6 7 8

LX LX

PGND GND REF PS LBI+ LBIOUT

TOP VIEW

MAX710 MAX711

PGND

ILIM

3/5 (FB)

SHDN

STBY

N/E

LBO

( ) IS FOR THE MAX711.

__________________Pin Configuration

MAX710

LBI+ LBO

N/E

SHDN

OFF

STBY

3/5

LBI-

REF PGND

0.1µF

GND ILIM

OUTPUT

3.3V/5V

+1.8V TO +11V

INPUT

OUT

3.3V

STBY

__________Typical Operating Circuit

19-1254; Rev 0; 7/97

PART

MAX710C/D

MAX710ESE MAX711C/D

0°C to +70°C

-40°C to +85°C

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

Dice 16 Narrow SO Dice

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

______________Ordering Information

MAX711ESE -40°C to +85°C 16 Narrow SO

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.

MAX710/MAX711

3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VPS= 5.6V, STBY = PS, C

REF

= 0.1µF, C

OUT

= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at

= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

PS, LX, OUT to GND............................................-0.3V to +11.5V

ILIM, SHDN, STBY, FB, 3/5, N/E, LBO,

LBI-, LBI+, REF to GND...........................-0.3V to (V

+ 0.3V)

PGND to GND .......................................................-0.3V to +0.3V

REF Short Circuit to GND...........................................Continuous

OUT

...................................................................................700mA

Continuous Power Dissipation (T

= +70°C)

SO (derate 8.70mW/°C above +70°C)..........................696mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range.............................-65°C to +160°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10sec).............................+300°C

ILIM = GND

ILIM = PS

VLX= 5.6V

MAX711, VPS= 2.7V

MAX710, VPS= 3.7V

STBY

= 0V, linear regulator

VPS= 5.6V

FB = 1.25V

TA= -40°C to +85°C, I

REF

= 0

TA= 0°C to +85°C, I

REF

= 0

MAX711

STBY

= V

SHDN

= logic high, current measured

into PS pin; I

LOAD

= 0

STBY

= 0V

SHDN

= 0V

MAX711, OUT = FB

CONDITIONS

1.1 1.5 1.95

LX Current Limit

0.5 0.8 1.3

µA0.1 1LX Leakage Current

Ω

0.6 1.2

LX On-Resistance 0.3 0.9

0.2 0.6

nA1 50FB Input Current

1.18 1.25 1.31

FB Voltage

V0.9Full Load Start-Up Voltage

1.20 1.25 1.29

mA10Standby Output Current

1.23 1.28 1.32

Reference Voltage

1.24 1.28 1.31

VFB 5.5Output Voltage-Adjustment Range

µA100 140Quiescent Current µA7 16Standby Quiescent Current

µA0.1 5Shutdown Quiescent Current

UNITSMIN TYP MAXPARAMETER

TA= 0°C to +85°C TA= -40°C to +85°C

0mA ≤ I

LOAD

≤ 250mA

MAX711, OUT = FB %0.1 1Load Regulation

3/5 = low, I

OUT

= 0 to 250mA

4.8 5.0 5.2TA= 0°C to +85°C

4.6 5.0 5.3TA= -40°C to +85°C

3/5 = high, I

OUT

= 0 to

250mA, V

= 4.7V

3.17 3.3 3.43TA= 0°C to +85°C

3.05 3.3 3.55TA= -40°C to +85°C

Output Voltage (MAX710)

0 < I

OUT

< 250mA, STBY = PS

%0.5Output Voltage Load Regulation

STBY = PS, 1.8V to 5V

%/V0.3Output Voltage Line Regulation

N/E = GND (Note 2)

N/E = PS

1.8 7.0

1.8 11.0

Input Voltage

MAX710/MAX711

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VPS= 5.6V, STBY = PS, C

REF

= 0.1µF, C

OUT

= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at

= +25°C.) (Note 1)

Note 1: Specifications at -40°C are guaranteed by design, not production tested. Note 2: Guaranteed by design (see Table 1). Note 3: The LBO comparator provides the correct result as long as one input is within the specified input range.

STBY, SHDN, N/E, 3/5, ILIM

STBY = PS

CONDITIONS

V0.4Input Low Voltage

°C150Thermal Shutdown

UNITSMIN TYP MAXPARAMETER

STBY, SHDN, N/E, 3/5, ILIM STBY, SHDN, N/E, 3/5, ILIM

(Note 3) V

LBI-

, V

LBI+

= 1.25V

mV6 40 100Hysteresis

V1.6Input High Voltage

nA1 50Input Bias Current

V1.2 10Input Range LBI-, LBI+

nA1 50Input Bias Current LBI-, LBI+

LBI-

= 1.25V

LBO

= 2mA, V

LBI-

= 1.25V, V

LBI+

= 1V

LBO

= -300µA, V

LBI-

= 1.25V, V

LBI+

= 2V

mV-25 +25LBI/LBO Offset Voltage

0.4 V

VPS- 0.2V

LBO Output Voltage

OUT

= 5.0V

Ω

0.7 1.3

Output PFET Resistance

= 3V, V

OUT

= 0V µA0.4 3Output PFET Leakage

MAX711, V

OUT

= 2.7V 1.6 3.0

MAX710, V

OUT

= 3.0V 1.3 2.4

STBY = PS

°C20Thermal Shutdown Hysteresis

LOGIC

LBI/LBO COMPARATOR

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

MAX710/MAX711

3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters

4 _______________________________________________________________________________________

0.1 10 10001 100

EFFICIENCY vs. LOAD CURRENT—

HIGH-EFFICIENCY AND LOW-NOISE MODES

OUT

= 5V)

MAX710/711 TOC04

LOAD CURRENT (mA)

EFFICIENCY (%)

OUT

= 5V

= 2.5V

N/E = GND

N/E = PS

ILIM = 0.8A

ILIM = 1.5A

0.01 101 10000.1 100

LINEAR-REGULATOR POWER-SUPPLY

REJECTION RATIO vs. FREQUENCY

MAX710/711 TOC08

FREQUENCY (kHz)

PSRR (dB)

0.1 10 10001 100

EFFICIENCY vs. LOAD CURRENT—

HIGH-EFFICIENCY AND LOW-NOISE MODES

OUT

= 3.3V)

MAX710/711 TOC05

LOAD CURRENT (mA)

EFFICIENCY (%)

OUT

= 3.3V

= 2.5V

ILIM = 0.8A

ILIM = 1.5A

LOW-NOISE MODE

HIGH-EFFICIENCY MODE

ILIM = 1.5A

200

600

800

400

1200

1400

1000

1600

0 42 6 8 10 12

NO-LOAD BATTERY CURRENT

vs. INPUT VOLTAGE

MAX710/711 TOC06

INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

N/E = GND

ILIM = GND (1.5A)

ILIM = PS (0.8A)

0.2

0.6

0.4

0.8

1.0

1 3 4 52 6 87 9 10 11

SHUTDOWN CURRENT

vs. INPUT VOLTAGE

MAX710/711 TOC09

INPUT VOLTAGE (V)

SHUTDOWN CURRENT (µA)

1000

1.0 1.4 2.2 2.6

MAXIMUM OUTPUT CURRENT

vs. INPUT VOLTAGE

100

MAX710/711 TOC07

INPUT VOLTAGE (V)

MAXIMUM OUTPUT CURRENT (mA)

1.81.2 2.01.6 2.4

ILIM = GND

ILIM = PS

N/E = GND N/E = PS

0.1 10 10001 100

EFFICIENCY vs. OUTPUT CURRENT—

HIGH-EFFICIENCY MODE

OUT

= 5V)

MAX710/711 TOC01

OUTPUT CURRENT (mA)

EFFICIENCY (%)

VIN = 1V

OUT

= 5V

N/E = GND

VIN = 3.6V

VIN = 2.5V

VIN = 5.6V

VIN = 1.8V

0.1 10 10001 100

EFFICIENCY vs. OUTPUT CURRENT—

HIGH-EFFICIENCY MODE

OUT

= 3.3V)

MAX710/711 TOC02

OUTPUT CURRENT (mA)

EFFICIENCY (%)

OUT

= 3.3V

N/E = GND

VIN = 2.5V

VIN = 1V

VIN = 1.8V

0.6

0.4

0.2

0.8

1.0

1.2

1.4

1.6

1.8

2.0

0 10050 150 200 250

MINIMUM START-UP INPUT VOLTAGE

vs. LOAD CURRENT

MAX710/711 TOC03

LOAD CURRENT (mA)

INPUT VOLTAGE (V)

OUT

= 5V

N/E = PS

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