MAX1551|MAX1555 [MAXIM]
SOT23. Dual-Input. USB/AC Adapter. 1-Cell Li+ Battery Chargers ; SOT23封装。双输入。 USB / AC适配器。 1节Li +电池充电器\n
| 型号： | MAX1551|MAX1555 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | SOT23. Dual-Input. USB/AC Adapter. 1-Cell Li+ Battery Chargers
|
| 文件： | 总8页 (文件大小：205K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2902; Rev 0; 7/03
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
General Description
Features
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.
ꢀ Charge from USB or AC Adapter
ꢀ Automatic Switchover when AC Adapter is
Plugged In
ꢀ On-Chip Thermal Limiting Simplifies Board
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.
Design
ꢀ Charge Status Indicator
ꢀ 5-Pin Thin SOT23 Package
ꢀ Protected by U.S. Patent #6,507,172
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.
Ordering Information
With USB connected, but without DC power, charge cur-
rent 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.
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 Thin SOT23-5
5 Thin SOT23-5
MAX1551EZK-T
MAX1555EZK-T
The MAX1551/MAX1555 are available in 5-pin thin SOT23
packages and operate over a -40°C to +85°C range.
Selector Guide
PART
MAX1551EZK
MAX1555EZK
TOP MARK
FEATURES
POK Output
CHG Output
Applications
ADRT
ADRU
PDAs
Wireless Appliances
Cell Phones
Digital Cameras
Pin Configuration
Typical Operating Circuit
TOP VIEW
DC
BAT
AC ADAPTER
3.7V TO 7V
TO SYSTEM
LOAD
Li+
USB
GND
1
2
3
5
4
BAT
DC
CHARGE
MAX1551
(MAX1555)
CONTROL
USB
USB
3.7V TO 6V
TO LOGIC RAIL
POK
(CHG)
LOGIC
CONTROL
POK
(CHG)
MAX1551
(MAX1555)
THIN SOT23
GND
*Protected by U.S. Patent #6,507,172.
________________________________________________________________ Maxim Integrated Products
1
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.
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
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
Continuous Power Dissipation (T = +70 C)
A
5-Pin Thin SOT23 (derate 9.1mW/ C above +70 C)....727mW
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
(V
= 5V, V
= 0, I
= 0, C
= 1µF, T = 0°C to +85°C, unless otherwise noted.)
DC
USB
BAT
BAT
A
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DC
DC Voltage Range
(Note 1)
3.7
0.1
7.0
6.0
V
V
DC to BAT Voltage Range
DC Undervoltage Lockout
Threshold
Input rising, 430mV hysteresis, V
= 3V (Note 1)
3.75
3.95
4.15
V
BAT
DC Supply Current
1.75
1
3
2
mA
DC to BAT On-Resistance
V
= 3.7V, V
= 3.6V
BAT
DC
When charging stops, V
DC falling, 200mV hysteresis
= 4V,
BAT
DC to BAT Dropout Voltage
30
60
90
mV
USB
USB Voltage Range
(Note 1)
3.7
6.0
V
V
Input rising, 430mV hysteresis, V
= 0,
= 0
DC
USB Undervoltage Threshold
3.75
3.95
4.15
V
V
V
= 3V (Note 1)
= 5V, V
= 3.7V, V
BAT
USB
USB
USB Supply Current
USB to BAT On-Resistance
= 0
1.65
2
3
4
mA
DC
= 3.6V, V
= 0
BAT
DC
When charging stops, V
USB falling, 200mV hysteresis, V
= 4V,
BAT
USB to BAT Dropout Voltage
30
60
90
mV
DC
BAT
BAT Regulation Voltage
DC Charging Current
USB Charging Current
BAT Prequal Threshold
V
V
V
V
V
V
or V
= 5V
USB
4.158
220
80
4.2
280
90
3
4.242
340
100
3.1
80
V
DC
= 3.3V, V
= 3.3V, V
= 0, V
= 5V
mA
mA
V
BAT
BAT
BAT
BAT
USB
DC
= 0, V
= 5V
DC
USB
rising, 100mV hysteresis
= 2.8V
2.9
Prequalification Charging Current
BAT Leakage Current
20
40
mA
µA
= V
= 0, V = 4.2V
BAT
5
DC
USB
POK, CHG, AND THERMAL LIMIT
Charge current where CHG goes high,
CHG Threshold
25
50
100
mA
I
falling, 50mA hysteresis
BAT
CHG, POK Logic-Low Output
CHG, POK Leakage Current
I
, I
= 10mA
150
300
1
mV
µA
CHG POK
V
, V
= 6V, T = +25 C
0.001
CHG POK
A
Charge current reduced by 17mA/ C above this
temperature
Thermal-Limit Temperature
+110
C
2
_______________________________________________________________________________________
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
ELECTRICAL CHARACTERISTICS
(V
= 5V, V
= 0, I
= 0, C
= 1µF, T = -40°C to +85°C, unless otherwise noted.) (Note 2)
BAT A
DC
USB
BAT
PARAMETER
CONDITIONS
MIN
MAX
UNITS
DC
DC Voltage Range
(Note 1)
3.7
0.1
7.0
6.0
V
V
DC to BAT Voltage Range
DC Undervoltage Lockout
Threshold
Input rising, 430mV hysteresis, V
= 3V (Note 1)
3.75
4.15
V
BAT
DC Supply Current
3
2
mA
DC to BAT On-Resistance
V
= 3.7V, V
= 3.6V
BAT
DC
When charging stops, V
hysteresis
= 4V, DC falling, 200mV
BAT
DC to BAT Dropout Voltage
30
95
mV
USB
USB Voltage Range
(Note 1)
3.7
6.0
V
V
USB Undervoltage Lockout
Threshold
Input rising, 430mV hysteresis, V
(Note 1)
= 0, V
= 3V
DC
BAT
3.75
4.15
USB Supply Current
V
V
= 5V, V
= 0
DC
3
4
mA
USB
USB
USB to BAT On-Resistance
= 3.7V, V
= 3.6V, V
= 0
BAT
DC
When charging stops, V
= 4V, USB falling, 200mV
BAT
USB to BAT Dropout Voltage
30
95
mV
hysteresis, V
= 0
DC
BAT
BAT Regulation Voltage
DC Charging Current
USB Charging Current
BAT Prequal Threshold
V
V
V
V
V
V
or V
= 5V
USB
4.141
220
80
4.259
340
100
3.1
80
V
DC
= 3.3V, V
= 3.3V, V
= 0, V
= 5V
= 5V
mA
mA
V
BAT
BAT
BAT
BAT
USB
DC
= 0, V
DC
USB
rising, 100mV hysteresis
= 2.8V
2.9
Prequalification Charging Current
BAT Leakage Current
POK, CHG
20
mA
µA
= V
= 0, V = 4.2V
BAT
5
DC
USB
Charge current where CHG goes high,
CHG Threshold
25
100
mA
I
falling, 50mA hysteresis
BAT
CHG, POK Logic-Low Output
CHG, POK Leakage Current
I
, I
= 10mA
300
1
mV
µA
CHG POK
V
, V
= 6V, T = +25 C
CHG POK A
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.
_______________________________________________________________________________________
3
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Typical Operating Characteristics
(V
= 5V, V
= 0, I
= 0, C = 1µF, T = +25 C, unless otherwise noted.)
BAT A
DC
USB
BAT
CHARGE CURRENT
vs. DC VOLTAGE HEADROOM
CHARGE CURRENT
vs. USB VOLTAGE HEADROOM
100
DC CHARGE CURRENT
vs. BATTERY VOLTAGE
300
300
250
200
150
100
50
250
200
150
100
50
80
60
40
20
0
0
0
V
BAT
= 3.8V, V FALLING
DC
V
DC
= 0, V = 3.8V, V
USB
FALLING
0.4
BAT
-50
-20
-50
0
0.1
0.2
0.3
0.4
0.5
0
0.1
0.2
0.3
0.5
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
DC VOLTAGE HEADROOM (V - V ) (V)
USB VOLTAGE HEADROOM (V
- V ) (V)
BAT
DC
BAT
USB
DC CHARGE CURRENT
vs. AMBIENT TEMPERATURE
BATTERY TERMINATION VOLTAGE
vs. TEMPERATURE
USB CHARGE CURRENT
vs. BATTERY VOLTAGE
300
250
200
150
100
50
4.22
4.21
4.20
4.19
4.18
100
80
60
40
20
0
BAT OPEN
THERMAL LIMIT ACTIVATED
0
V
BAT
= 3.8V, V = 5V
DC
-50
-20
25
35
45
55
65
75
85
-40
-15
10
35
60
85
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
BATTERY VOLTAGE (V)
TEMPERATURE ( C)
TEMPERATURE ( C)
OFF-BATTERY LEAKAGE CURRENT
vs. DC INPUT VOLTAGE
USB-TO-DC TRANSITION WAVEFORM
MAX1551/55 toc08
2.5
2.0
1.5
1.0
0.5
0
V
= 0, SWEEPING USB
DC
BATTERY
CURRENT
200mA/div
0 TO 5V OR V
= 0,
USB
SWEEPING DC 0 TO 5V
0A
0V
0V
V
BAT
= 4.2V
V
USB
5V/div
V
POK
2V/div
V
DC
5V/div
0V
0
1
2
3
4
5
400ms/div
DC OR USB INPUT VOLTAGE (V)
4
_______________________________________________________________________________________
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Pin Description
PIN
1
NAME
USB
FUNCTION
USB Port Charger Supply Input. USB draws up to 100mA to charge the battery. Decouple USB with a 1µF
ceramic capacitor to GND.
2
GND
POK
Ground
Power-OK Active-Low Open-Drain Charger Status Indicator. POK pulls low when either charger source is
present (MAX1551 only).
3
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).
CHG
DC Charger Supply Input for an AC Adapter. DC draws 280mA to charge the battery. Decouple DC with a
1µF ceramic capacitor to GND.
4
5
DC
BAT
Battery Connection. Decouple BAT with a 1µF ceramic capacitor to GND.
USB to Adapter Power Handoff
Detailed Description
The MAX1551/MAX1555 can charge from either the
The MAX1551/MAX1555 charge a single-cell Li+ bat-
tery 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.
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.
An internal thermal control loop simplifies PC board lay-
out and allows optimum charging rate without the ther-
mal 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 tem-
perature of +110 C.
MAX1551 Power-OK (POK)
The MAX1551’s POK is an active-low, open-drain out-
put that goes low when V
or V
is above 3.95V.
USB
DC
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.
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 con-
nected, 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.
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 imped-
ance 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.
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.
Table 1. USB and DC Input Selection
V
> 3.95V AND
DON’T CARE
V
< 3.52V AND
DC
DC
V
DC
> 7V OR V
> 6V
V
DC
AND V
< 3.52V
USB
USB
V
USB
3.95V < V
< 6V
USB
Exceeds operating input range. Not allowed. See the
Absolute Maximum Ratings section.
280mA (typ)
charging from DC
100mA (max)
charging from USB
Undervoltage lockout
(V takes precedence when both inputs are present.)
DC
_______________________________________________________________________________________
5
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
not shut down, but progressively reduce charging cur-
rent 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.
Precharge Current
The MAX1551/MAX1555 feature a precharge current to
protect deeply discharged cells. If V
is less than 3V,
BAT
the device enters precharge mode where charging cur-
rent is limited to 40mA.
Package Thermal Limiting
On-chip thermal limiting in the MAX1551/MAX1555 sim-
plifies PC board layout and allows charging rates to be
optimized without the limits imposed by worst-case bat-
tery 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
Bypass Capacitors
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
DC
BAT
AC ADAPTER
TO SYSTEM
LOAD
3.7V TO 7V
C1
Li+
1 F
C3
1 F
CHARGE
CONTROL
USB
USB
3.7V TO 6V
TO LOGIC RAIL
C2
1 F
R1
100k
POK
(CHG)
LOGIC
CONTROL
INDICATES
THAT POWER
IS PRESENT
(EITHER DC
OR USB)
MAX1551
(MAX1555)
GND
6
_______________________________________________________________________________________
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
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.)
_______________________________________________________________________________________
7
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.
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