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What is MAX1555?

This electronic component, produced by the manufacturer "Maxim Integrated", performs the same function as "SOT23 Dual-Input USB/AC Adapter 1-Cell Li+ Battery Chargers".


MAX1555 Datasheet PDF - Maxim Integrated

Part Number MAX1555
Description SOT23 Dual-Input USB/AC Adapter 1-Cell Li+ Battery Chargers
Manufacturers Maxim Integrated 
Logo Maxim Integrated Logo 


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AVAILABLE
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
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 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.
The MAX1551/MAX1555 are available in 5-pin thin SOT23
packages and operate over a -40°C to +85°C range.
Applications
PDAs
Wireless Appliances
Cell Phones Functional Diagrams
Digital Cameras
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
PART
MAX1551EZK-T
MAX1555EZK-T
Ordering Information
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 Thin SOT23-5
5 Thin SOT23-5
PART
MAX1551EZK
MAX1555EZK
Selector Guide
TOP MARK
ADRT
ADRU
FEATURES
POK Output
CHG Output
Pin Configuration
Typical Operating Circuit
TOP VIEW
USB 1
5 BAT
MAX1551
GND 2 (MAX1555)
POK 3
(CHG)
4 DC
THIN SOT23
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
AC ADAPTER
3.7V TO 7V
DC
BAT
USB
3.7V TO 6V
CHARGE
USB CONTROL
MAX1551
(MAX1555)
LOGIC
POK
CONTROL (CHG)
GND
TO SYSTEM
LOAD
Li+
TO LOGIC RAIL
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-2902; Rev 0; 7/03
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MAX1555 equivalent
MAX1551/MAX1555
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
Pin Description
PIN NAME
FUNCTION
1
USB
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 Ground
POK
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
CHG 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).
4 DC DC Charger Supply Input for an AC Adapter. DC draws 280mA to charge the battery. Decouple DC with a
1µF ceramic capacitor to GND.
5 BAT Battery Connection. Decouple BAT with a 1µF ceramic capacitor to GND.
Detailed Description
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.
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.
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.
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
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 MAX1551s POK is an active-low, open-drain out-
put 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 MAX1555s 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.
VDC > 7V OR VUSB > 6V
Exceeds operating input range. Not allowed. See the
Absolute Maximum Ratings section.
(VDC takes precedence when both inputs are present.)
VDC > 3.95V AND
VUSB DONT 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
Maxim Integrated
5
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