Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Converter, Boost SO 16

AVAILABLE

EVALUATION KIT AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

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

_______________General Description

The MAX710/MAX711 integrate a step-up DC-DC con-

verter 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 (I

= 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 V

= 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

3.3V/5V or Adjustable,

Step-Up/Down DC-DC Converters

LX LX

PGND

GND

REF

LBI+

LBI-

OUT

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

______________Ordering Information

MAX711ESE -40°C to +85°C 16 Narrow SO

MAX710/MAX711

Summary of content (12 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters LE AVAILAB _______________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%.
PAGE 2
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters ABSOLUTE MAXIMUM RATINGS 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 (VPS + 0.3V) PGND to GND .......................................................-0.3V to +0.3V REF Short Circuit to GND ...........................................Continuous IOUT ..................................................................
PAGE 3
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters ELECTRICAL CHARACTERISTICS (continued) (VPS = 5.6V, STBY = PS, CREF = 0.1µF, COUT = 4.7µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Output PFET Resistance Output PFET Leakage Thermal Shutdown Thermal Shutdown Hysteresis CONDITIONS MIN TYP MAX 0.7 1.3 MAX710, VOUT = 3.0V 1.3 2.4 MAX711, VOUT = 2.7V 1.6 3.0 VPS = 3V, VOUT = 0V 0.
PAGE 4
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters __________________________________________Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) VIN = 2.5V VIN = 1.8V VIN = 1V 60 VIN = 1.8V 70 VIN = 1V 50 0.1 1 10 100 1000 0 0.1 1 10 100 VOUT = 5V N/E = PS 0.2 1000 0 50 100 150 200 250 NO-LOAD BATTERY CURRENT vs. INPUT VOLTAGE 70 N/E = PS HIGH-EFFICIENCY MODE ILIM = 0.8A ILIM = 1.5A 80 ILIM = 0.8A 70 ILIM = 1.5A VOUT = 3.3V VIN = 2.
PAGE 5
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) LINE-TRANSIENT RESPONSE LOAD-TRANSIENT RESPONSE MAX710/711 TOC10 MAX710/711 TOC11 A A B B 2ms/div 1ms/div A: VOUT = 3.3V (50mV/div, AC COUPLED), N/E = PS B: IOUT = 10mA TO 100mA A: VOUT = 3.
PAGE 6
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters ______________________________________________________________Pin Description PIN NAME FUNCTION MAX710 MAX711 1 1 LX 2 2 PGND 3 3 ILIM 4 4 SHDN Shutdown Input. When low, the entire circuit is off and OUT is actively pulled to GND. 5 5 STBY Standby Input. Connect to GND to disable boost circuit. Connect to PS for normal operation.
PAGE 7
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters N/E VOUT VIN ERROR AMP2 REF1 PS LX ∆tON FIXED tOFF GENERATOR VFV DRV N OFF PS ILIM MAX710 100mV CURRENTLIMIT COMPARATOR PGND ERROR AMP1 REF1 PGND PS REF2 OUT (FB) SHDN REFA REF2 REF STBY 3.3/5 REFB LBI+ REF1 GND LBILBO ( ) IS FOR MAX711. Figure 1.
PAGE 8
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters In high-efficiency mode (N/E = low), the maximum input voltage is limited to 7V. This voltage limitation is easily overcome, however, by configuring the LBO output to change modes based on input voltage, allowing an 11V maximum input with high-efficiency configurations. Four operating configurations are described in Table 1 and in the following subsections.
PAGE 9
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters Configuration 3: High Efficiency, 11V, VBATT < 6.5V In this configuration, N/E is driven high by LBO when V IN > 6.5V (Figure 2b). When V IN < V OUT , the IC boosts, and the linear regulator operates as a switch, with minimum forward drop. When VIN > VOUT, linear regulation begins. When VIN > 6.5V (set by R5 and R6), the linear regulator forces a minimum forward drop of VFV (typically 0.5V at 5V VOUT) as LBO drives N/E high.
PAGE 10
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters Table 2. Component Selection INDUCTORS (L1) CAPACITORS RECTIFIERS (D1) Sumida CD75-220 (1.5A), CDRH-74-220 (1.23A), or CD54-220 100µF, 16V low-ESR tantalum capacitor AVX TPSE107M016R0100 or Sprague 593D107X0016E2W Coilcraft DO33-08P-223 4.
PAGE 11
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters SOICN.
PAGE 12
MAX710/MAX711 3.3V/5V or Adjustable, Step-Up/Down DC-DC Converters NOTES 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.