Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - DC/DC voltage regulator Boost TDFN 6

General Description

The MAX8569A/MAX8569B low-quiescent-current

boost regulators provide up to 200mA at output volt-

ages up to 5.5V from a 1.5V to 5.5V input source. The

built-in synchronous rectifier allows for over 90% effi-

ciency while achieving small size and low cost by elimi-

nating the need for an external Schottky diode.

The MAX8569A provides an adjustable output while the

MAX8569B is fixed at 3.0V or 3.3V. The MAX8569B fea-

tures a power-on reset output (RST) to signal that the

output has reached regulation. All devices connect the

battery input to the output during shutdown, allowing

the input battery to be used as a backup or real-time

clock supply when the converter is off.

Applications

Features

♦ Over 200mA Available Output Current

♦ 1.5V to 5.5V Input Voltage Range

♦ BATT Connected to OUT in Shutdown for Backup

Power

♦ Up to 95% Efficiency

♦ 7µA Typical Quiescent Current

♦ <1µA Shutdown Supply Current

♦ Internal Synchronous Rectifier

♦ 750mA Switch Current Limit

♦ RST Output (MAX8569B)

♦ Adjustable Output Voltage (MAX8569A)

♦ Fixed 3.0V or 3.3V Output Voltage (MAX8569B)

MAX8569A/MAX8569B

200mA Step-Up Converters in 6-Pin

SOT23 and TDFN

________________________________________________________________ Maxim Integrated Products 1

MAX8569A

(MAX8569B)

TOP VIEW

FB (RST)

OUT

SHDN

BATT

GND

123

TDFN

( ) ARE FOR THE MAX8569B

MAX8569A

(MAX8569B)

TOP VIEW

SOT23

FB (RST)

OUT

SHDN

BATT

GND

+ DENOTES LEAD-FREE PACKAGING

Pin Configurations

Ordering Information

19-3671; Rev 0; 5/05

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.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX8569AEUT-T*

-40°C to +85°C

6 SOT23-6

(U6FH-6)

MAX8569AETT+

-40°C to +85°C

6 TDFN 3mm x 3mm

(T633-1)

MAX8569BEUT-T*

-40°C to +85°C

6 SOT23-6

(U6FH-6)

MAX8569BETT+

-40°C to +85°C

6 TDFN 3mm x 3mm

(T633-1)

MAX8569BETT30+

-40°C to +85°C

6 TDFN 3mm x 3mm

(T633-1)

Selector Guide appears at end of data sheet.

MAX8569B

RST

OUT

INPUT

3.3V, 200mA

OUTPUT

POWER-ON

RESET

OFF

SHDN

BATT

GND

Typical Operating Circuit

Medical Diagnostic

Equipment

Digital Cameras

PDAs and Smartphones

Cordless Phones

Battery Backup

PC Cards

Local 3.3V or 5V Supply

*Future product—contact factory for availability.

+Denotes lead-free packaging.

Summary of content (11 pages)

PAGE 1
9-3671; Rev 0; 5/05 KIT ATION EVALU LE B A IL A AV 200mA Step-Up Converters in 6-Pin SOT23 and TDFN The MAX8569A/MAX8569B low-quiescent-current boost regulators provide up to 200mA at output voltages up to 5.5V from a 1.5V to 5.5V input source. The built-in synchronous rectifier allows for over 90% efficiency while achieving small size and low cost by eliminating the need for an external Schottky diode. The MAX8569A provides an adjustable output while the MAX8569B is fixed at 3.0V or 3.3V.
PAGE 2
MAX8569A/MAX8569B 200mA Step-Up Converters in 6-Pin SOT23 and TDFN ABSOLUTE MAXIMUM RATINGS BATT, LX, OUT, FB, RST to GND .............................-0.3V to +6V SHDN to GND...........................................-0.3V to (VOUT + 0.3V) LX Current ....................................................................1.5A Peak Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 9.1mW/°C above +70°C)............727mW 6-Pin TDFN 3mm x 3mm (derate 18.2mW/°C above +70°C) ............................
PAGE 3
200mA Step-Up Converters in 6-Pin SOT23 and TDFN (VSHDN = VOUT = 3.3V, VBATT = 2.0V, TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS Rising edge, 100mV hysteresis (typ), VOUT = 2.8V SHDN Threshold SHDN Input Bias Current VOUT = 5.5V RST Low Voltage IRST = 1mA, VOUT = 2.5V RST Leakage Current VRST = 5.5V RST Threshold Relative to OUT, 3.3V for MAX8569B, 3.0V for MAX8569BETT30 LX Leakage Current VOUT = 5.
PAGE 4
Typical Operating Characteristics (Circuit of Figure 2, VOUT = 3.3V, VBATT = +2V, TA = +25°C, circuit of Figure 1, TA = +25°C, unless otherwise noted.) EFFICIENCY vs. LOAD CURRENT VOUT = 5V EFFICIENCY vs. LOAD CURRENT VOUT = 3.3V VIN = 4.2V VIN = 2V EFFICIENCY (%) VIN = 2.5V 85 80 75 75 65 65 100 10 1000 1 10 100 1000 LOAD CURRENT (mA) LOAD CURRENT (mA) EFFICIENCY vs. LOAD CURRENT VOUT = 2.5V MAXIMUM OUTPUT CURRENT vs. BATTERY VOLTAGE MAX8569 toc03 100 95 90 85 VIN = 2V 80 75 VIN = 1.
PAGE 5
200mA Step-Up Converters in 6-Pin SOT23 and TDFN OUTPUT VOLTAGE AND INPUT CURRENT vs. INPUT VOLTAGE (ON, 330Ω) MAX8569 toc07 4.0 5 VOUT 4 4 3 3 2 2 IBATT 1 1 0 0 0 1 2 3 4 5 3.5 3.0 3.0 2.5 2.5 2.0 2.0 IBATT 1.5 1.5 1.0 1.0 0.5 0.5 0 6 0 0 1 2 3 4 5 6 BATTERY VOLTAGE (V) OUTPUT VOLTAGE AND INPUT CURRENT vs. INPUT VOLTAGE (ON, 16Ω LOAD) MAX8569 toc09 4.0 ON/OFF RESPONSE (RLOAD = 33Ω) MAX8569 toc10 4.5 4.0 VOUT 3.5 3.5 3.0 3.0 2.5 2.5 2.0 2.0 IBATT 1.
PAGE 6
MAX8569A/MAX8569B 200mA Step-Up Converters in 6-Pin SOT23 and TDFN Typical Operating Characteristics (continued) (Circuit of Figure 2, VOUT = 3.3V, VBATT = +2V, TA = +25°C, circuit of Figure 1, TA = +25°C, unless otherwise noted.) SHUTDOWN RESPONSE (RLOAD = 33Ω) SWITCHING WAVEFORMS (RLOAD = 33Ω) MAX8569 toc14 MAX8569 toc13 VOUT (AC-COUPLED) 100mV/div 3.3V VOUT 2V VLX 2V/div IL VSHDN 500mA/div 2V/div 10µs/div 100µs/div Pin Description PIN 6 NAME FUNCTION 1 SHDN Shutdown Input.
PAGE 7
200mA Step-Up Converters in 6-Pin SOT23 and TDFN The MAX8569A and MAX8569B compact high-efficiency step-up converters feature low-quiescent supply current to ensure the highest possible efficiency over a wide load range. With a minimum 1.5V input voltage, these devices are well suited for applications with two alkaline cells, two nickel-metal-hydride (NiMH) cells, or one lithium-ion (Li+) cell. When SHDN is low, the output is connected to the battery through the inductor and an internal p-channel MOSFET.
PAGE 8
MAX8569A/MAX8569B 200mA Step-Up Converters in 6-Pin SOT23 and TDFN Low-Battery Cutoff The SHDN trip threshold of the MAX8569A/MAX8569B can be used as an input voltage detector that disables the IC when the battery voltage falls to a set level. The SHDN trip threshold is 1.228V. Use a resistor-divider to set the battery-detection voltage (R1 and R2 in Figure 1). Select R2 between 100kΩ and 1MΩ to minimize battery drain.
PAGE 9
200mA Step-Up Converters in 6-Pin SOT23 and TDFN 6, 8, &10L, DFN THIN.EPS D2 D A2 PIN 1 ID N 0.35x0.35 b PIN 1 INDEX AREA E [(N/2)-1] x e REF. E2 DETAIL A e k A1 CL CL A L L e e PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.
PAGE 10
MAX8569A/MAX8569B 200mA Step-Up Converters in 6-Pin SOT23 and TDFN 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.) COMMON DIMENSIONS MIN. MAX. D 0.70 2.90 0.80 3.10 E A1 2.90 0.00 3.10 0.05 L k 0.20 0.40 0.25 MIN. A2 0.20 REF. SYMBOL A PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b [(N/2)-1] x e DOWNBONDS ALLOWED T633-1 6 1.
PAGE 11
200mA Step-Up Converters in 6-Pin SOT23 and TDFN 6LSOT.EPS 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.