FEATURES

● High Efficiency, 1.5MHz, Synchronous Buck Charger

 95% Charge Efficiency at 1A from 5V Input

 91.4% Charge Efficiency at 2A from 9V Input

 Optimized for USB Voltage Input (5V)

 Selectable PFM Mode for Light Load Efficiency

● USB On-The-Go (OTG) Support (Boost Mode)

 Boost Converter with up to 2A Output

 Boost Efficiency of 93.5% at 0.5A and 94.3% at 1A

 Accurate Hiccup Mode Over-Current Protection

 Soft-Start Capable with up to 500μF Capacitive Load

 Output Short Circuit Protection

 Selectable PFM Mode for Light Load Operations

● Single Input for USB or High Voltage Adaptors

 3.9V to 13.5V Operating Input Voltage Range

 22V Absolute Maximum Input Voltage Rating

 Programmable Input Current Limit and Dynamic

Power Management (IINDPM, 100mA to 3.1A with

100mA Resolution & 3.8A) to Support USB 2.0 and

USB 3.0 Standards and High Voltage Adaptors

 Maximum Power Tracking by Programmable Input

Voltage Limit (VINDPM) with Selectable Offset

 VINDPM Tracking of Battery Voltage

 Auto Detect USB BC1.2, SDP, CDP, DCP and

Non-Standard Adaptors

● High Battery Discharge Efficiency with 19mΩ Switch

● Narrow Voltage DC (NVDC) Power Path Management

 Instant-On with No or Highly Depleted Battery

 Ideal Diode Operation in Battery Supplement Mode

● Ship Mode, Wake-Up and Full System Reset Capability

by Battery FET Control

● Flexible Autonomous and I2

C Operation Modes for

Optimal System Performance

● Fully Integrated Switches, Current Sense and

Compensation

● External Direct Charging Path Enable Output

● 9μA Ship Mode Low Battery Leakage Current

● High Accuracy

 ±0.6% Charge Voltage Regulation (8mV/Step)

 ±5% Charge Current Regulation at 2A

 ±10% Input Current Regulation at 0.9A

● Safety

 Battery Temperature Sensing (Charge/Boost Modes)

 Thermal Regulation and Thermal Shutdown

 Input Under-Voltage Lockout (UVLO)

 Input Over-Voltage (ACOV) Protection

APPLICATIONS

Smart Phones, EPOS

Portable Internet Devices and Accessory

GENERAL DESCRIPTION

The SGM41541/SGM41542 are battery chargers and system

power path management devices with integrated converter

and power switches for using with single-cell Li-Ion or

Li-polymer batteries. This highly integrated 3.78A device is

capable of fast charging and supports a wide input voltage

range suitable for smart phones, tablets and portable systems.

I

2

C programming makes it a very flexible powering and

charger design solution.

The devices include four main power switches: input reverse

blocking FET (RBFET, Q1), high-side switching FET for Buck

or Boost mode (HSFET, Q2), low-side switching FET for Buck

or Boost mode (LSFET, Q3) and battery FET that controls the

interconnection of the system and battery (BATFET, Q4). The

bootstrap diode for the high-side gate driving is also

integrated. The internal power path has a very low impedance

that reduces the charging time and maximizes the battery

discharge efficiency. Moreover, the input voltage and current

regulations provide maximum charging power delivery to the

battery with various types of input sources.

A wide range of input sources are supported, including

standard USB hosts, charging ports and USB compliant high

voltage adaptors. The default input current limit is

automatically selected based on the built-in USB interface.

This limit is determined by the detection circuit in the system

(e.g. USB PHY). The SGM41541/SGM41542 are USB 2.0

and USB 3.0 power specifications compliant with input

current and voltage regulation. It also meets USB On-The-Go

(OTG) power rating specification and is capable of boosting

the battery voltage to supply 5.15V on VBUS with 2A (or 1.2A)

current limit.

The system voltage is regulated slightly above the battery

voltage by the power path management circuit and is kept

above the programmable minimum system voltage (3.5V by

default). Therefore, system power is maintained even if the

battery is completely depleted or removed. Dynamic power

management (DPM) feature is also included that automatically

reduces the charge current if the input current or voltage limit

is reached. If the system load continues to increase after

reduction of charge current down to zero, the power path

management provides the deficit from battery by discharging

battery to the system until the system power demand is

fulfilled. This is called supplement mode, which prevents the

input source from overloading.

Starting and termination of a charging cycle can be

accomplished without software control. The sensed battery

voltage is used to decide for starting phase of charging in one

of the three phases of charging cycle: pre-conditioning,

constant current or constant voltage. When the charge

current falls below a preset limit and the battery voltage is

above recharge threshold, the charger function will

automatically terminate and end the charging cycle. If the

voltage of a charged battery falls below the recharge

threshold, the charger begins another charging cycle.

Several safety features are provided in the SGM41541/

SGM41542 such as over-voltage and over-current protections,

battery temperature monitoring, charging safety timing,

thermal shutdown and input UVLO. TS pin is connected to an

NTC thermistor for battery temperature monitoring and

protection in both charge and Boost modes according to

JEITA profile. This device also features thermal regulation in

which the charge current is reduced, if the junction

temperature exceeds 80℃ or 120℃ (selectable).

Charging status is reported by the STAT output and

fault/status bits. A negative pulse is sent to the nINT output

pin as soon as a fault occurs to notify the host. BATFET reset

control is provided by nQON pin to exit ship mode or for a full

system reset.

The devices supply a DCEN signal to control an external

P-MOSFET or load switch as a direct charging path for low

voltage PMID, or to control a 2:1 switching capacitor divider

for high voltage PMID.

The SGM41541/SGM41542 are available in a Green

TQFN-4×4-24L package.