Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Boost uMAX 10

General Description

The MAX1760/MAX1760H are high-efficiency, low-noise,

step-up DC-DC converters intended for use in battery-

powered wireless applications. They combine low quies-

cent supply current (100µA) with a high 1MHz operating

frequency. Small external components and tiny 10-pin

TDFN and µMAX

packages make this device an excel-

lent choice for small hand-held applications. The

MAX1760 is activated by a logic-low ON signal while the

MAX1760H is activated by a logic-high ON input.

Both devices use a synchronous-rectified pulse-width-

modulation (PWM) boost topology to generate 2.5V to

5.5V outputs from a wide range of inputs, such as 1 to 3

alkaline or NiCd/NiMH cells or a single lithium-ion (Li+)

cell. Proprietary Idle-Mode™ circuitry significantly

improves light-load efficiency and smoothly transitions to

fixed-frequency PWM operation at higher load currents.

Low-noise, forced-PWM mode is available for applica-

tions requiring constant-frequency operation at all load

currents. PWM operation can also be synchronized to

an external clock to protect sensitive frequency bands

in communications equipment. Analog soft-start and

adjustable current limit permit optimization of efficiency,

external component size, and output voltage ripple.

Applications

Digital Cordless Phones PCS Phones

Wireless Handsets Handheld Instruments

Palmtop Computers Personal Communicators

Two-Way Pagers

Features

♦ Up to 94% Efficiency

♦ 0.7V to 5.5V Input Range

♦ Up to 800mA Output

♦ Fixed 3.3V Output (or Adjustable from 2.5V to 5.5V)

♦ PWM Synchronous-Rectified Topology

♦ Low-Noise, Constant-Frequency Operation (1MHz)

♦ 0.1µA Logic-Controlled Shutdown

♦ Synchronizable Switching Frequency

♦ Adjustable Current Limit

♦ Adjustable Soft-Start

♦ 10-Pin µMAX Package

♦ 10-Pin 3mm x 3mm TDFN Package

MAX1760/MAX1760H

0.8A, Low-Noise, 1MHz,

Step-Up DC-DC Converter

________________________________________________________________ Maxim Integrated Products 1

POUT

PGNDFB

GND

REF

ISET

µMAX

TOP VIEW

CLK/SELOUT

ON (ON)

(ON) FOR MAX1760H

POUT

ON (ON)

GND

REF

ISET

7 PGND

4FB

6 CLK/SEL

5OUT

TDFN

(3mm x 3mm)

MAX1760

MAX1760H

MAX1760

MAX1760H

PGND

FB GND

POUT

ISET

OUT

REF

CLK/SEL

INPUT = 0.7V

TO V

OUT

= 3.3V,

800mA

MAX1760

Typical Operating Circuit

19-1660; Rev 3; 1/07

EVALUATION KIT

AVAILABLE

µMAX is a registered trademark of Maxim Integrated Products, Inc.

Idle Mode is a trademark of Maxim Integrated Products, Inc.

Pin Configurations

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.

Ordering Information

PART

PIN-

PACKAGE

LOGIC

PKG CODE

MAX1760ETB

10 TDFN-EP*

Low

T1033-1

MAX1760EUB 10 µMAX Low

U10-2

MAX1760HETB

10 TDFN-EP*

High

T1033-1

MAX1760HEUB

10 µMAX High

U10-2

*EP = Exposed paddle.

Note: All devices are specified over the -40°C to +85°C operating

temperature range.

Summary of content (14 pages)

PAGE 1
9-1660; Rev 3; 1/07 KIT ATION EVALU LE B A IL A AV 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter The MAX1760/MAX1760H are high-efficiency, low-noise, step-up DC-DC converters intended for use in batterypowered wireless applications. They combine low quiescent supply current (100µA) with a high 1MHz operating frequency. Small external components and tiny 10-pin TDFN and µMAX® packages make this device an excellent choice for small hand-held applications.
PAGE 2
MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter ABSOLUTE MAXIMUM RATINGS ON, ON, OUT, CLK/SEL to GND ..................................-0.3V to +6V PGND to GND ..........................................................................±0.3V LX to PGND .................................................-0.3V to (VPOUT + 0.3V) POUT to OUT ...........................................................................±0.3V REF, FB, ISET, POUT to GND.......................-0.3V to (VOUT + 0.
PAGE 3
0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter (CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) PARAMETER Switch On-Resistance TYP MAX N-channel CONDITIONS 0.15 0.28 P-channel 0.25 0.45 N-Channel Current Limit P-Channel Turn-Off Current CLK/SEL = GND MIN UNITS Ω 1.0 1.25 1.6 A 20 60 120 mA 1.230 1.250 1.270 V 5 15 mV 0.2 5 mV 0.
PAGE 4
ELECTRICAL CHARACTERISTICS (continued) (CLK/SEL = FB = PGND = GND, ISET = REF, OUT = POUT, VOUT = 3.6V, TA = -40°C to +85°C, unless otherwise noted.) (Note 7) PARAMETER CONDITIONS N-Channel Current Limit MIN MAX UNITS 1.0 1.6 A 1.230 1.270 V 0.2 x VOUT V REFERENCE Reference Output Voltage IREF = 0 LOGIC INPUTS CLK/SEL Input Low Level 2.5V ≤ VOUT ≤ 5.5V CLK/SEL Input High Level 2.5V ≤ VOUT ≤ 5.5V ON, ON Input Low Level (Note 6) 0.8 x VOUT V 1.1V ≤ VOUT ≤ 1.8V 0.2 1.8V ≤ VOUT ≤ 5.
PAGE 5
0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter NO-LOAD BATTERY CURRENT vs. INPUT VOLTAGE TOTAL SHUTDOWN CURRENT (ILX + IOUT) vs. INPUT VOLTAGE 1.5 1.0 VOUT = 5V 0.5 0.1 3 4 0 5 STARTUP VOLTAGE vs. OUTPUT CURRENT 1 PEAK INDUCTOR CURRENT (A) C 1.5 1.0 0.5 3 4 5 0.75 6 -40 0.01 10 35 60 85 TEMPERATURE (°C) PEAK INDUCTOR CURRENT vs. VISET HEAVY-LOAD SWITCHING WAVEFORMS MAX1760-08 1.2 A 1.0 0.8 B 0.6 0.4 C 0.2 CIRCUIT OF FIGURE 6 -15 INPUT VOLTAGE (V) 1.4 MAX1760-07 2.
PAGE 6
Typical Operating Characteristics (continued) (Circuit of Figure 2, VIN = 2.4V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.) TURN-ON WAVEFORMS NO SOFT-START COMPONENTS 12 A MAX1760-15 MAX1760-13 16 SOFT-START WAVEFORMS RSS = 500kΩ, CSS = 0.1µF MAX1760-14 NOISE SPECTRUM NOISE (mVRMS) MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter A 8 B B 4 C 0 C 0V OV 0.1 1 10 FREQUENCY (MHz) t = 2ms/div 2.
PAGE 7
0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter MAX1760/MAX1760H UNDERVOLTAGE LOCKOUT OUT IC POWER CONTROLLER POUT 2.15V STARTUP OSCILLATOR EN ON (MAX1760H) ON (MAX1760) ON 1.25V REF GND GND PCH D LX RDY REFERENCE REF Q EN EN OSC OSC NCH OSCILLATOR 1MHz CLK/SEL MODE MODE PGND CLK/SEL FB FB ISET ISET MAX1760 Figure 1. Functional Diagram Detailed Description The MAX1760 is a highly efficient, low-noise power supply for portable RF and hand-held instruments.
PAGE 8
MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter Table 1. Typical Available Output Current NUMBER OF NiCd/NiMH CELLS INPUT VOLTAGE (V) OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) 1 1.2 3.3 350 2.4 3.3 800 2.4 5.0 500 3.6 5.0 750 2 3 Table 2. Selecting the Operating Mode CLK/SEL MODE FEATURES 0 Normal operation 1 Forced PWM Low noise, fixed frequency at all loads. External clock 500kHz to 1.2MHz Synchronized PWM Low noise, fixed frequency at all loads.
PAGE 9
0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter MAX1760 3.3µH VIN = 2.4V 33µF CLK/SEL LX ON MAX1760 ISET REF 0.22µF PGND GND POUT VOUT 100µF 4.7Ω OUT FB 0.68µF R1 R1 = R2 R2 ( ) VOUT -1 VFB VFB = 1.24V Figure 3. Connecting Resistors for External Feedback REF REF 0.22µF RSS ILIM = 1.25A MAX1760 ILIM = 1.25A 0.22µF RSS1 tSS = RSSCSS MAX1760 ( RSS2 RSS1 + RSS2 ) tSS = (RSS1 II RSS2) CSS ISET ISET RSS2 CSS RSS ≥ 470kΩ Figure 4.
PAGE 10
MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter Table 3. Component Selection Guide PRODUCTION METHOD INDUCTORS CAPACITORS DIODES TOKO type D52LC AVX TPS series EIC SB series TOKO type D518LC Kemet T510 series Motorola MBR0520L Sumida CDRH5D18 Sanyo POSCAP series — Sumida CDRH4D28 — — Surface mount Table 4.
PAGE 11
0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter The input filter capacitor reduces peak currents drawn from the input source and also reduces input switching noise. The input voltage source impedance determines the required value of the input capacitor. When operating directly from one or two NiMH cells placed close to the MAX1760, use a single 33µF low-ESR input filter capacitor. With higher impedance batteries, such as alkaline and Li+, a higher value input capacitor may improve efficiency.
PAGE 12
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) e 10LUMAX.EPS MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter 4X S 10 10 INCHES H Ø0.50±0.1 0.6±0.1 1 1 0.6±0.1 BOTTOM VIEW TOP VIEW D2 MILLIMETERS MAX DIM MIN 0.043 A 0.006 A1 0.002 A2 0.030 0.037 0.120 D1 0.116 0.118 D2 0.114 E1 0.116 0.120 0.118 E2 0.114 0.199 H 0.187 L 0.0157 0.
PAGE 13
0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter 6, 8, &10L, DFN THIN.EPS PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm 21-0137 H 1 2 ______________________________________________________________________________________ 13 MAX1760/MAX1760H Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.
PAGE 14
MAX1760/MAX1760H 0.8A, Low-Noise, 1MHz, Step-Up DC-DC Converter Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) PACKAGE VARIATIONS COMMON DIMENSIONS SYMBOL MIN. MAX. PKG. CODE N D2 E2 e JEDEC SPEC b A 0.70 0.80 T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF D 2.90 3.10 T633-2 6 1.50±0.10 2.30±0.10 0.