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MAX1722/MAX1723/

MAX1724

1.5µA I

, Step-Up DC-DC Converters in TSOT

General Description

The MAX1722/MAX1723/MAX1724 compact, high-effi-

ciency, step-up DC-DC converters are available in tiny,

5-pin TSOT packages. They feature an extremely low

1.5µA quiescent supply current to ensure the highest pos-

sible light-load efficiency. Optimized for operation from

one to two alkaline or nickel-metal-hydride (NiMH) cells, or

a single Li+ cell, these devices are ideal for applications

where extremely low quiescent current and ultra-small size

are critical.

Built-in synchronous rectification significantly improves

efficiency and reduces size and cost by eliminating the

need for an external Schottky diode. All three devices fea-

ture a 0.5Ω N-channel power switch. The MAX1722/

MAX1724 also feature proprietary noise-reduction circuitry,

which suppresses electromagnetic interference (EMI)

caused by the inductor in many step-up applications. The

family offers different combinations of fixed or adjustable

outputs, shutdown, and EMI reduction (see

Selector

Guide

Applications

Features

o Up to 90% Efficiency

o No External Diode or FETs Needed

o 1.5µA Quiescent Supply Current

o 0.1µA Logic-Controlled Shutdown

o ±1% Output Voltage Accuracy

o Fixed Output Voltage (MAX1724) or Adjustable

Output Voltage (MAX1722/MAX1723)

o Up to 150mA Output Current

o 0.8V to 5.5V Input Voltage Range

o 0.91V Guaranteed Startup (MAX1722/MAX1724)

o Internal EMI Suppression (MAX1722/MAX1724)

o TSOT Package (0.9mm typ Height)

GND

OUTFB

5LXBATT

MAX1722

TSOT

TOP VIEW

PART

TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX1722EZK+T+

-40°C to +85°C

5 TSOT

ADQF

MAX1723EZK+T

-40°C to +85°C

5 TSOT

ADQG

MAX1724EZK27+T

-40°C to +85°C

5 TSOT

ADQH

MAX1724EZK30+T

-40°C to +85°C

5 TSOT

ADQI

MAX1724EZK33+T

-40°C to +85°C

5 TSOT

ADQJ

MAX1724EZK50+T

-40°C to +85°C

5 TSOT

ADQK

OUT

0.8V TO 5.5V

3.3V AT

UP TO 150mA

OFF

BATT

MAX1724

SHDN

GND

10μH

OUT

Typical Operating Circuit

19-1735; Rev 2; 5/13

Ordering Information

Pagers

Remote Controls

Remote Wireless

Transmitters

Personal

Medical Devices

Digital Still Cameras

Single-Cell Battery-

Powered Devices

Low-Power Hand-Held

Instruments

MP3 Players

Personal Digital

Assistants (PDA)

Pin Configurations are continued at end of data sheet.

Pin Configurations

Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Selector Guide appears at end of data sheet.

Summary of content (12 pages)

PAGE 1
MAX1722/MAX1723/ MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT General Description The MAX1722/MAX1723/MAX1724 compact, high-efficiency, step-up DC-DC converters are available in tiny, 5-pin TSOT packages. They feature an extremely low 1.5µA quiescent supply current to ensure the highest possible light-load efficiency.
PAGE 2
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT ABSOLUTE MAXIMUM RATINGS OUT, SHDN, BATT, LX to GND ................................-0.3V to +6V FB to GND ................................................-0.3V to (VOUT + 0.3V) OUT, LX Current.......................................................................1A Continuous Power Dissipation (TA = +70°C) 5-Pin Thin SOT (derate 2.7mW/°C above +70°C) ..219.10mW Operating Temperature Range ...........................
PAGE 3
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT ELECTRICAL CHARACTERISTICS (continued) (VBATT = 1.2V, VOUT = 3.3V (MAX1722/MAX1723), VOUT = VOUT(NOM) (MAX1724), SHDN = OUT, RL = ∞, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL Shutdown Current into BATT SHDN Voltage Threshold CONDITIONS MAX1724 (Note 4) VIL MAX1723/MAX1724 VIH MAX1723/MAX1724 MAX1723/MAX1724, V SHDN = 5.
PAGE 4
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT Typical Operating Characteristics (Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), VBATT = VIN = 1.5V, L = 10µH, CIN = 10µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT EFFICIENCY vs. LOAD CURRENT (VOUT = 5.0V) (VOUT = 2.5V) (VOUT = 3.3V) 70 VIN = 1.0V 60 80 70 60 L = DO1606 0.1 1 10 100 1000 0.1 VIN = 1.0V 1 10 100 0.01 1000 0.
PAGE 5
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT Typical Operating Characteristics (continued) (Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), VBATT = VIN = 1.5V, L = 10µH, CIN = 10µF, COUT = 10µF, TA = +25°C, unless otherwise noted.) SHUTDOWN RESPONSE 3.3V MAX1722 toc10 MAX1722 toc09 LOAD-TRANSIENT RESPONSE 5V A VOUT 2V/div 0 50mA 2V VSHDN 1V/div B 0 0 A: VOUT, 50mV/div B: IOUT, 20mA/div 1ms/div VIN = 3.3V, VOUT = 5.
PAGE 6
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT OUT MAX1723 ZEROCROSSING DETECTOR STARTUP CIRCUITRY P SHDN CONTROL LOGIC DRIVER LX FB ERROR COMPARATOR 1.235V REFERENCE N CURRENT LIMIT GND Figure 1. MAX1723 Simplified Functional Diagram Detailed Description The MAX1722/MAX1723/MAX1724 compact, high-efficiency, step-up DC-DC converters are guaranteed to start up with voltages as low as 0.91V and operate with an input voltage down to 0.8V. Consuming only 1.
PAGE 7
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT DAMPING SWITCH BATT OUT MAX1724 ZEROCROSSING DETECTOR STARTUP CIRCUITRY R2 P SHDN CONTROL LOGIC DRIVER ERROR COMPARATOR LX N R1 CURRENT LIMIT 1.235V REFERENCE GND Figure 2. MAX1724 Simplified Functional Diagram 10μH 1.2V TO VOUT D1 10μF SHDN LX OUT R2 2.37MΩ MAX1723 GND VOUT = 3.6V 10μF FB Shutdown (MAX1723/MAX1724) R1 1.24MΩ Figure 3.
PAGE 8
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT VOUT VIN MAX1722 MAX1724 PDRV OUT P BATT DAMPING SWITCH TIMING CIRCUIT DAMP LX NDRV N GND Figure 4. Simplified Diagram of Damping Switch 1V/div 1V/div 1μs/div 1μs/div Figure 5. LX Ringing Without Damping Switch (MAX1723) Figure 6.
PAGE 9
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT INPUT 0.8V TO VOUT 10μF For maximum output current, choose the inductor value so that the controller reaches the current-limit before the maximum on-time is triggered: 10μH OUT MAX1722 L< OUTPUT 2V TO 5.5V LX BATT R2 10μF VBATT t ON(MAX) ILIM where the maximum on-time is typically 5µs, and the current limit (ILIM) is typically 500mA (see Electrical Characteristics table).
PAGE 10
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT Table 2. Suggested Surface-Mount Capacitors and Manufacturers (C1 and C2) MANUFACTURER AVX CAPACITOR VALUE DESCRIPTION 1μF to 10μF X7R Ceramic 10μF to 330μF TAJ Tantalum Series TPS Tantalum Series PHONE WEBSITE 843-448-9411 www.avxcorp.com 1μF to 22μF X5R/X7R Ceramic 10μF to 330μF T494 Tantalum Series 68μF to 330μF T520 Tantalum Series Sanyo 33μF to 330μF TPC Polymer Series 408-749-9714 www.secc.co.
PAGE 11
MAX1722/MAX1723/MAX1724 1.5µA IQ, Step-Up DC-DC Converters in TSOT Pin Configurations (continued) TOP VIEW SHDN 1 GND 2 5 LX BATT 1 MAX1723 FB 3 OUT SHDN 3 TSOT OUTPUT (V) SHDN LX DAMPING MAX1722EZK Adjustable No Yes MAX1723EZK Adjustable Yes No MAX1724EZK27 Fixed 2.7 Yes Yes MAX1724EZK30 Fixed 3.0 Yes Yes MAX1724EZK33 Fixed 3.3 Yes Yes MAX1724EZK50 Fixed 5.
PAGE 12
MAX1722/MAX1723/MAX1724 1.