BC3770 datasheet(7/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

BC3770

4.2

Electrical Characteristics

Table 4. BC3770 Electrical Characteristics

Characteristics noted under conditions: VVBUS = 5.0 V, VBATREG = 3.7 V, VVIO = 1.8 V, CVBUS = CPMID = 2.2 F, CVSYS = 10 F,

CCHGOUT = 4.7 F, CVL = 1.0 F, L = 1.0 H, TA = - 40 °C to 85 °C *). Typical values are at TA = 25°C, unless otherwise noted. (6)

Symbol

Characteristic

Min

Typ

Max

Unit

Notes

VBUS Supply

VBUS_OP

VVIO_OP

Operating Range

• On VBUS

•On VIO

4.0

1.6

—

6.2

3.3

VBUS_UVLO

UVLO Threshold

• VBUS rising, 200 mV Hysteresis, VBUSOK bit set to 1

3.6

3.8

4.0

VBUS_OVP

OVP Threshold

• VBUS rising to turn off converter, 200 mV Hysteresis

6.3

6.5

6.7

(7)

VAICL_TH

Adaptive-Input Current Limit (AICL) Threshold Range

• VBUS falling, Programmable in 100 mV steps, 4.5 V Default

4.3

—

4.9

IVBUS_OP

Adaptive-Input Current Limit (AICL) Threshold Range

• In charger enabled, IFAST_CHG = ISYS = 0 mA, SHDNB = H,

SUSPEN = 0

LX No switching, VVSYS = VBATREG = 4.4 V override

LX switching w/VSYS = 3.7 V in PWM

• USB suspended mode in SUSPEN=1

—

2.0

—

1.0

IIN_LIM

Input Current Limit Programmable Range

•500 mA default, test 100 mA, 500 mA, 900 mA and 1.9 A only in

production

100

—

2050

IIN_LIM Accuracy

• With respect to IIN_LIM = 100 mA

• With respect to IIN_LIM = 500 mA

• With respect to IIN_LIM = 900 mA

• With respect to IIN_LIM = 2000 mA

100

107

(7)

VBUS Pull-down Resistance

• Off in BOOST Mode

—

100

—



VL LDO Regulator

VOUT_VLLDO

Output Voltage

•VPMID = 5.0 V, ILOAD = 30 mA

4.65

4.8

—

ILOAD_LIM

Current Limit

•VVLLDO = 3.8 V

—

(7)

Switching Regulator

fSW

Switching Frequency

• In PWM mode

1.35

1.5

1.65

MHz

(7)

DMAX

Maximum Duty Cycle

—

DMIN

Minimum Duty Cycle

0.0

—

ILIM_CHG

Cycle-by-cycle Current Limit for Charger Mode

• For high-side MOSFET in charger mode

—

3.5

4.7

(7)

Minimum Output Capacitance

• For stability

-30%

—

F

(7)

Notes

Specifications over the TA range are assured by design, characterized, and correlated with process control.

Guaranteed by design, characterization, and correlation with process controls. Not fully tested in production.

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