MAX1551, MAX1555 Datasheet. Www.s Manuals.com. R0 Maxim

User Manual: Marking of electronic components, SMD Codes AD, AD*, AD**, AD***, AD-, AD-**, AD-***, AD5***, AD=***, ADB, ADK***, ADL***, ADM*, ADQM, ADQO, ADQP, ADQQ, ADQR, ADQS, ADQT, ADQV, ADQW, ADQX, ADQY, ADQZ, ADRA, ADRB, ADRC, ADRD, ADRT, ADRU, ADZ*, Ad. Datasheets AO3413L, BCW60D, BCX51-16, BD48E26G, BD48K26G, BL3406B-1.8V, CR08AS-8, CSPEMI202A, ESDR0502B, KDZ20B, MAX1551EZK, MAX1555EZK, MAX1935ETA, MAX6314US47D1-T, MAX8867EZK25, MAX8867EZK28, MAX8867EZK29, MAX8867EZK30, MAX8867EZK32, MAX8867EZK33, MAX8867EZK36, M

Open the PDF directly: View PDF .
Page Count: 9

Download
Open PDF In Browser	View PDF

19-2902; Rev 0; 7/03

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Features
♦ Charge from USB or AC Adapter
♦ Automatic Switchover when AC Adapter is
Plugged In
♦ On-Chip Thermal Limiting Simplifies Board
Design
♦ Charge Status Indicator
♦ 5-Pin Thin SOT23 Package
♦ Protected by U.S. Patent #6,507,172

Ordering Information
TEMP RANGE

PIN-PACKAGE

MAX1551EZK-T

PART

-40°C to +85°C

5 Thin SOT23-5

MAX1555EZK-T

-40°C to +85°C

5 Thin SOT23-5

The MAX1551/MAX1555 are available in 5-pin thin SOT23
packages and operate over a -40°C to +85°C range.

Applications
PDAs

Selector Guide
TOP MARK

FEATURES

MAX1551EZK

PART

ADRT

POK Output

MAX1555EZK

ADRU

CHG Output

Wireless Appliances
Cell Phones
Digital Cameras

Pin Configuration
TOP VIEW

Typical Operating Circuit
AC ADAPTER
3.7V TO 7V

USB

GND 2

THIN SOT23

TO SYSTEM
LOAD
Li+

USB
3.7V TO 6V

BAT

MAX1551
(MAX1555)

POK 3
(CHG)

USB

CHARGE
CONTROL
TO LOGIC RAIL

LOGIC
CONTROL

DC
MAX1551
(MAX1555)

POK
(CHG)

GND

*Protected by U.S. Patent #6,507,172.
________________________________________________________________ Maxim Integrated Products

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.

MAX1551/MAX1555

General Description
The MAX1551/MAX1555 charge a single-cell lithium-ion
(Li+) battery from both USB* and AC adapter sources.
They operate with no external FETs or diodes, and
accept operating input voltages up to 7V.
On-chip thermal limiting simplifies PC board layout and
allows optimum charging rate without the thermal limits
imposed by worst-case battery and input voltage. When
the MAX1551/MAX1555 thermal limits are reached, the
chargers do not shut down, but progressively reduce
charging current.
The MAX1551 includes a POK output to indicate when
input power is present. If either charging source is
active, POK goes low. The MAX1555 instead features a
CHG output to indicate charging status.
With USB connected, but without DC power, charge current is set to 100mA (max). This allows charging from
both powered and unpowered USB hubs with no port
communication required. When DC power is connected,
charging current is set at 280mA (typ). No input-blocking
diodes are required to prevent battery drain.

MAX1551/MAX1555

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
ABSOLUTE MAXIMUM RATINGS
DC to GND......................................................................0 to +8V
DC to BAT .......................................................................0 to +7V
BAT, CHG, POK, USB to GND .................................-0.3V to +7V
Continuous Power Dissipation (TA = +70°C)
5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW

Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature Range ............................-40°C to +150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C

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.

ELECTRICAL CHARACTERISTICS
(VDC = 5V, VUSB = 0, IBAT = 0, CBAT = 1µF, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

DC
DC Voltage Range

(Note 1)

DC to BAT Voltage Range
DC Undervoltage Lockout
Threshold

Input rising, 430mV hysteresis, VBAT = 3V (Note 1)

3.7

7.0

0.1

6.0

3.95

4.15

1.75

Ω

6.0

3.95

4.15

1.65
2

3
4

mA
Ω

4.158

4.2

4.242

3.75

DC Supply Current
DC to BAT On-Resistance

VDC = 3.7V, VBAT = 3.6V

DC to BAT Dropout Voltage

When charging stops, VBAT = 4V,
DC falling, 200mV hysteresis

USB
USB Voltage Range
USB Undervoltage Threshold
USB Supply Current
USB to BAT On-Resistance
USB to BAT Dropout Voltage

(Note 1)
Input rising, 430mV hysteresis, VDC = 0,
VBAT = 3V (Note 1)
VUSB = 5V, VDC = 0
VUSB = 3.7V, VBAT = 3.6V, VDC = 0
When charging stops, VBAT = 4V,
USB falling, 200mV hysteresis, VDC = 0

3.7
3.75

BAT
BAT Regulation Voltage

VDC or VUSB = 5V

DC Charging Current

VBAT = 3.3V, VUSB = 0, VDC = 5V

220

280

340

USB Charging Current

VBAT = 3.3V, VDC = 0, VUSB = 5V

100

BAT Prequal Threshold

VBAT rising, 100mV hysteresis

2.9

3.1

Prequalification Charging Current

VBAT = 2.8V

BAT Leakage Current

VDC = VUSB = 0, VBAT = 4.2V

µA

100

150

300

µA

POK, CHG, AND THERMAL LIMIT
CHG Threshold

Charge current where CHG goes high,
IBAT falling, 50mA hysteresis

CHG, POK Logic-Low Output

ICHG, IPOK = 10mA

CHG, POK Leakage Current

VCHG, VPOK = 6V, TA = +25°C

0.001

Thermal-Limit Temperature

Charge current reduced by 17mA/°C above this
temperature

+110

_______________________________________________________________________________________

°C

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
(VDC = 5V, VUSB = 0, IBAT = 0, CBAT = 1µF, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER

CONDITIONS

MIN

MAX

UNITS

DC
DC Voltage Range

(Note 1)

DC to BAT Voltage Range
DC Undervoltage Lockout
Threshold

Input rising, 430mV hysteresis, VBAT = 3V (Note 1)

3.7

7.0

0.1

6.0

3.75

4.15

Ω

DC Supply Current
DC to BAT On-Resistance

VDC = 3.7V, VBAT = 3.6V

DC to BAT Dropout Voltage

When charging stops, VBAT = 4V, DC falling, 200mV
hysteresis

USB Voltage Range

(Note 1)

3.7

6.0

USB Undervoltage Lockout
Threshold

Input rising, 430mV hysteresis, VDC = 0, VBAT = 3V
(Note 1)

3.75

4.15

USB Supply Current

VUSB = 5V, VDC = 0

USB to BAT On-Resistance

VUSB = 3.7V, VBAT = 3.6V, VDC = 0

Ω

USB to BAT Dropout Voltage

When charging stops, VBAT = 4V, USB falling, 200mV
hysteresis, VDC = 0

4.141

4.259

USB

BAT
BAT Regulation Voltage

VDC or VUSB = 5V

DC Charging Current

VBAT = 3.3V, VUSB = 0, VDC = 5V

220

340

USB Charging Current

VBAT = 3.3V, VDC = 0, VUSB = 5V

100

BAT Prequal Threshold

VBAT rising, 100mV hysteresis

2.9

3.1

Prequalification Charging Current

VBAT = 2.8V

BAT Leakage Current

VDC = VUSB = 0, VBAT = 4.2V

µA

100

300

µA

POK, CHG
Charge current where CHG goes high,
IBAT falling, 50mA hysteresis

CHG Threshold
CHG, POK Logic-Low Output

ICHG, IPOK = 10mA

CHG, POK Leakage Current

VCHG, VPOK = 6V, TA = +25°C

Note 1: The input undervoltage lockout has 430mV of hysteresis. The charger turns on when an input rises to 3.95V (typ), and turns
off when it falls below 3.52V.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.

_______________________________________________________________________________________

MAX1551/MAX1555

ELECTRICAL CHARACTERISTICS

Typical Operating Characteristics
(VDC = 5V, VUSB = 0, IBAT = 0, CBAT = 1µF, TA = +25°C, unless otherwise noted.)

CHARGE CURRENT
vs. DC VOLTAGE HEADROOM

150
100
50

60
40
20

250

-20
0.2

0.3

0.4

150
100
50

VDC = 0, VBAT = 3.8V, VUSB FALLING

-50
0.1

200

VBAT = 3.8V, VDC FALLING

-50
0

0.5

0.1

0.2

0.3

0.5

0.4

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

DC VOLTAGE HEADROOM (VDC - VBAT) (V)

USB VOLTAGE HEADROOM (VUSB - VBAT) (V)

BATTERY VOLTAGE (V)

USB CHARGE CURRENT
vs. BATTERY VOLTAGE

DC CHARGE CURRENT
vs. AMBIENT TEMPERATURE

BATTERY TERMINATION VOLTAGE
vs. TEMPERATURE

60
40
20

THERMAL LIMIT ACTIVATED
200
150
100
50

-20

-50

MAx1551/55 toc06

250

4.22
BAT OPEN
BATTERY TERMINATION VOLTAGE (V)

300

MAX1551/55 toc05

MAX1551/55 toc04

100

DC CHARGE CURRENT (mA)

MAX1551/55 toc03

MAX1551/55 toc02

300

DC CHARGE CURRENT (mA)

200

DC CHARGE CURRENT
vs. BATTERY VOLTAGE

100

CHARGE CURRENT (mA)

250
CHARGE CURRENT (mA)

CHARGE CURRENT
vs. USB VOLTAGE HEADROOM
MAX1551/55 toc01

300

USB CHARGE CURRENT (mA)

4.21

4.20

4.19

VBAT = 3.8V, VDC = 5V
0

4.18
25

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

-40

TEMPERATURE (°C)

BATTERY VOLTAGE (V)

-15

USB-TO-DC TRANSITION WAVEFORM
MAX1551/55 toc08

MAX1551/55 toc07

2.5
VDC = 0, SWEEPING USB
0 TO 5V OR VUSB = 0,
SWEEPING DC 0 TO 5V

2.0

BATTERY
CURRENT
200mA/div
0A

VBAT = 4.2V

VUSB
5V/div

1.5
0V
1.0

VPOK
2V/div

0.5

VDC
5V/div

0
0

400ms/div

DC OR USB INPUT VOLTAGE (V)

TEMPERATURE (°C)

OFF-BATTERY LEAKAGE CURRENT
vs. DC INPUT VOLTAGE
OFF-BATTERY LEAKAGE CURRENT (µA)

MAX1551/MAX1555

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers

_______________________________________________________________________________________

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
PIN

NAME

USB

USB Port Charger Supply Input. USB draws up to 100mA to charge the battery. Decouple USB with a 1µF
ceramic capacitor to GND.

GND

Ground

POK

Power-OK Active-Low Open-Drain Charger Status Indicator. POK pulls low when either charger source is
present (MAX1551 only).

CHG

Active-Low Open-Drain Charge Status Indicator. CHG pulls low when the battery is charging. CHG goes to a
high-impedance state, indicating the battery is fully charged, when the charger is in voltage mode and
charge current falls below 50mA. CHG is high impedance when both input sources are low (MAX1555 only).

FUNCTION

DC Charger Supply Input for an AC Adapter. DC draws 280mA to charge the battery. Decouple DC with a
1µF ceramic capacitor to GND.

BAT

Battery Connection. Decouple BAT with a 1µF ceramic capacitor to GND.

Detailed Description
The MAX1551/MAX1555 charge a single-cell Li+ battery from both USB and AC adapter sources, enabling
portable users to forgo carrying a wall cube. These
devices operate with no external FETs or diodes, and
accept operating input voltages up to 7V.
An internal thermal control loop simplifies PC board layout and allows optimum charging rate without the thermal limits imposed by worst-case battery and input
voltage. When the MAX1551/MAX1555 thermal limits
are reached, the chargers do not shut down, but simply
reduce charging current by 17mA/°C above a die temperature of +110°C.
With USB connected, but without DC power, the charge
current is set to 100mA (max). This allows charging
from both powered and unpowered USB hubs with no
port communication required. When DC power is connected, charging current is set at 280mA (typ). The
MAX1551/MAX1555 do not feature an enable input.
Once power is connected to USB and/or DC, the
charger is on.
When input power is removed, battery leakage current
is less than 5µA. No input-blocking diodes are required
to prevent battery drain. Insert a diode at DC (the
adapter input) if protection from negative voltage inputs
(reversed-polarity adapter plugs) is required.

USB to Adapter Power Handoff
The MAX1551/MAX1555 can charge from either the
USB input or the DC input. The battery does not charge
from both sources at the same time. The MAX1551/
MAX1555 automatically detect the active input and
charge from that. If both power sources are active, the
DC input takes precedence. The switchover between
DC and USB is detailed in Table 1.

MAX1551 Power-OK (POK)
The MAX1551’s POK is an active-low, open-drain output that goes low when VDC or VUSB is above 3.95V.
POK can be used as a logic output or can drive an
LED. POK indicates the charger is connected to input
power and is charging.

MAX1555 Charge Status (CHG)
The MAX1555’s CHG is an active-low, open-drain
charge status indicator. CHG pulls low when the battery
is charging (whenever USB or DC are powered) and
charge current is greater than 50mA. CHG indicates
when the battery is fully charged by going high impedance when the charger is in voltage mode and charge
current falls below 50mA. Charging does not stop when
CHG goes high. CHG is low in precharge mode.

Table 1. USB and DC Input Selection
VDC > 7V OR VUSB > 6V
Exceeds operating input range. Not allowed. See the
Absolute Maximum Ratings section.

VDC > 3.95V AND
VUSB DON’T CARE
280mA (typ)
charging from DC

VDC < 3.52V AND
3.95V < VUSB < 6V
100mA (max)
charging from USB

VDC AND VUSB < 3.52V
Undervoltage lockout

(VDC takes precedence when both inputs are present.)
_______________________________________________________________________________________

MAX1551/MAX1555

Pin Description

MAX1551/MAX1555

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Precharge Current

not shut down, but progressively reduce charging current by 17mA/°C above a die temperature of +110°C.
Solder the MAX1551/MAX1555s’ GND to a large
ground plane to help dissipate power and keep the die
temperature below the thermal limit. The USB charge
current of 100mA is unlikely to induce thermal limiting.

The MAX1551/MAX1555 feature a precharge current to
protect deeply discharged cells. If VBAT is less than 3V,
the device enters precharge mode where charging current is limited to 40mA.

Package Thermal Limiting

Bypass Capacitors

On-chip thermal limiting in the MAX1551/MAX1555 simplifies PC board layout and allows charging rates to be
optimized without the limits imposed by worst-case battery and input voltages. The device reduces the power
dissipation at BAT to prevent overheating. This allows
the board design to be optimized for compact size and
typical thermal conditions. When the MAX1551/
MAX1555 thermal limits are reached, the chargers do

Use ceramic bypass capacitors at DC, USB, and BAT.
Mount these capacitors within 1cm of their respective
pins. X7R and X5R dielectrics are recommended.

Chip Information
TRANSISTOR COUNT: 541
PROCESS: BiCMOS

Typical Application Circuit
AC ADAPTER
3.7V TO 7V
C1
1µF

USB
3.7V TO 6V
C2
1µF

BAT
Li+

USB

C3
1µF

CHARGE
CONTROL

TO LOGIC RAIL

LOGIC
CONTROL

MAX1551
(MAX1555)

TO SYSTEM
LOAD

GND

POK
(CHG)

R1
100kΩ
INDICATES
THAT POWER
IS PRESENT
(EITHER DC
OR USB)

_______________________________________________________________________________________

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers

_______________________________________________________________________________________

MAX1551/MAX1555

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.)

MAX1551/MAX1555

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
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.)

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.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2003 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products.

www.s-manuals.com

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.6
Linearized                      : No
XMP Toolkit                     : Adobe XMP Core 4.0-c316 44.253921, Sun Oct 01 2006 17:14:39
Create Date                     : 2003:07:31 10:22:17Z
Creator Tool                    : QuarkXPressª: AdobePS 8.7.3 (301)
Modify Date                     : 2015:12:20 10:01:17+02:00
Metadata Date                   : 2015:12:20 10:01:17+02:00
Format                          : application/pdf
Creator                         : 
Title                           : MAX1551, MAX1555 - Datasheet. www.s-manuals.com.
Subject                         : MAX1551, MAX1555 - Datasheet. www.s-manuals.com.
Producer                        : Acrobat Distiller 4.0 for Macintosh
Document ID                     : uuid:b805ba81-4c26-4e71-b14f-306ea5f73435
Instance ID                     : uuid:0e751a87-5a5c-4194-a839-6c24b4753b27
Page Count                      : 9
Keywords                        : MAX1551, MAX1555 - Datasheet. www.s-manuals.com.

EXIF Metadata provided by EXIF.tools

MAX1551, MAX1555 Datasheet. Www.s Manuals.com. R0 Maxim

Navigation menu

Versions of this User Manual:

Views

Navigation