The WP3880 provides complete Li+ charger protection against Input over-voltage, input over-current and thermal shutdown protection is also available. When any of the monitored parameters is over the threshold, the IC turns off the charging current. All protections also have deglitch time against false triggering due to voltage spikes or current transients. The system is positive overvoltage protected up to +30V. Thanks to a very low current consumption, the USB charge is compatible with this integrated component.

The WP3880 provides complete Li+ charger protections, and saves the external MOSFET and Schottky diode for the charger of cell phone’s PMIC. This device uses internal PMOS FET, making external devices unnecessary, which reduces the system cost and PCB area of the application board. The above features and small package make the WP3880 an ideal part for cell phones applications. WP3880 is able to instantaneously disconnect the output from the input if the input voltage exceeds the overvoltage threshold. Additional overcurrent protection function allows turning off internal PMOS FET when the charge current exceeds current limit, which is externally selectable.

The current limit value can be modified with control logic pin to divide it by internal gain, allowing USB100 mA/500mA charging or USB/Wall adapter charging up to overcurrent threshold. At the same time, Li ion Battery voltage is continuously monitored, providing more safety during the charge.

WP3880 provides a negative going flag (FLAG) output, which alerts the system that a fault has occurred as overvoltage (power supply or battery voltage), overcurrent or thermal event.

Features

●Overvoltage Protection Up to +30V

●Fast Turn Off Time

●Very Low Current Consumption/USB Compliant

●Li ion Battery Voltage Monitoring

●Overvoltage Lockout (OVLO)

●Under-voltage Lockout (UVLO)

●Overcurrent Protection Externally Adjustable (OCP) up to 2.8A

●Thermal Shutdown

●Shutdown and Gain Input Pins

●Soft−Start to Eliminate Inrush Current

●Alert Output

●Compliance to IEC61000-4-2 (Level 4): 8kV (Contact), 15kV (Air) bypassed with a 1μF or larger capacitor.

●ESD Ratings: Machine Model = B; Human Body Model = 2.

●Package: DNF8

●Pb-Free Devices

Electrical Characteristics

Min/Max limits values (-40°C A<+85°C) and Vin=+5.0V. Typical values are T_A=+25°C, unless otherwise noted.

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage Range	V_in		1.2		28	V
Under-voltage Lockout Threshold	UVLO	V_in falls down UVLO threshold	1.75	1.85	1.9	V
Under-voltage Lockout Hysteresis	UVLO_hyst			80	100	mV
Overvoltage Lockout Threshold	OVLO	V_inrises up OVLO threshold	6.90	7.20	7.50	V
Overvoltage Lockout Hysteresis	OVLO_hyst			100	150	mV
Vin versus Vout Resistance	R_DS(on)	V_in = 5 V, Enable Mode, Load Connected to V_out		40	90	mΩ
Supply Quiescent Current	Idd	No Load		40	120	μA
Disable Mode	Idd_dis	= 1.2V		38	100	μA
Overcurrent Threshold	I_OCP	Vin = 5V, = low, Load Connected to V_out, R_ilim= 0 ohms, 1A/μs, GS = 0.4V	2.30	2.85	3.40	A
Overcurrent Response	I_reg	1 A/μs, GS = low, I_lim = 1.51A		5.0		%
Current Limit Gain	GS_value	GS = 1.2V		2.55
Battery Overvoltage Threshold	OV_BAT	0°C to 85°C	4.3	4.35	4.4	V
Battery Overvoltage Hysteresis	OV_HYS	0°C to 85°C	100	150	200	mV
V_BAT Pin Leakage	VBAT_LEAK				20	nA
V_BAT Deglitch Time	VBAT_DEG	V_BAT > OV_BAT	0.2	2.0	4.0	ms
FLAG Output Low Voltage	Vol_flag	V_in > OVLO Sink 1 mA on FLAG pin			400	mV
FLAG Leakage Current	leak	level = 5V		10		nA
Voltage High	V_ih	V_in from 3.3V to 5.25V	1.2			V
Voltage Low	V_il	V_in from 3.3V to 5.25V			0.4	V
EN Leakage Current	leak	= 5.5V or GND		200		nA
GS Voltage High	V_ih	V_in from 3.3 V to 5.25 V	1.2			V
GS Voltage Low	V_il	V_in from 3.3 V to 5.25 V			0.4	V
GS Leakage Current	GS_leak	= 5.5V or GND		200		nA
TIMINGS
Start Up Delay	t_on	From V_in > UVLO to V_out = 0.8xV_in	15	30	45	ms
FLAG going up Delay	t_start	From V_out > 0.2xV_in to = 1.2V	15	30	45	ms
Rearming Delay	t_REARM	OCP Active	15	30	45	ms
Overcurrent Regulation Time	t_REG	OCP Active	1.2	1.8	3.0	ms
Output Turn Off Time	t_off	From V_in > OVLO to V_out ≤ 0.3V, V_in increasing from 5V to 8V at 3V/μs.		1.5	5.0	μs
Alert Delay	t_stop	From V_in > OVLO to ≤ 0.4V V_in increasing from 5V to 8 V at 3 V/μs		1.5		μs
Disable Time	t_dis	From 0.4 to 1.2V to V_out ≤ 0.3V		3.0		μs
Temperature
Thermal Shutdown Temperature	T_sd			150		°C
Thermal Shutdown Hysteresis	T_sdhyst			30		°C

NOTE: Electrical parameters are guaranteed by correlation across the full range of temperature.

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