BC3770 datasheet(9/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

BC3770

Battery Charger (Continued)

IBAT_STD

Stand-By Current

• No VBUS, VBATREG = 4.2 V, ISYS = 0 mA, SHDNB = H(I2C

active), Q4 = On with OCP enabled, ENCOMPARATOR bit reset to

0, others with default

—

A

IBAT_SHDN

Shutdown Current

• No VBUS, VBATREG = 4.2 V, charger disabled, Q4 = On with

OCP disabled, SHDNB = L (I2C inactive), ENCOMPARATOR bit

reset to 0, others with default

—

A

VCHGEN_ON

VCHGEN_OFF

Charger Enable Threshold

•VBUS - VBATREG, rising, valid VBUS detected to enable buck &

charging

•VBUS - VBATREG, falling, invalid VBUS detection to disable buck

& charging

100

0.0

150

200

—

(11)

VTRICKLE

Trickle to Pre-charge Mode Change Threshold

•VBATREG rising, 100 mV Hysteresis

2.4

2.5

2.7

(11)

ITRICKLE

Trickle Charge Current

• Fixed, VBATREG = 2.3 V, VSYS = 3.6 V

—

IPRECHG

Pre-charge Current Programmable Range

•450 mA default and test in production

150

—

450

IFAST_CHG

Fast-charge Current Programmable Range

•500 mA default, test 500 mA, 1.0 A only in production

100

—

2000

ITOPOFF

Top-off Current Programmable Range

•IFAST_CHG falling, 100 mA default, in 50 mA steps, test 100 mA

and 300 mA only in production

100

—

VBAT_OVP

Overvoltage Protection Threshold

• BATREG rising

—

VBAT_REG

+ 0.1

—

Soft-start Slope Time

• In fast charge mode

—

1.17

—

mA/

s

Minimum Output Capacitance

• On CHGOUT, For stability

-30%

4.7

—

F

(11)

Charge Current Accuracy

• Pre-charge current at 150 mA

• Top-off current at 100 mA

•IFAST_CHG = 1000mA

•IFAST_CHG = 2000mA

-20

-7.0

—

7.0

(11)

Thermal Protection

TSD

Thermal Shutdown Temperature

• Temperature rising to shutdown with 20 °C hysteresis

—

150

—

°C

(11)

TCF

Thermal Regulation Threshold

• Rising, charge current starts to reduce and the Interrupt

triggered

—

100

—

°C

Thermal Regulation Gain

• To have no charge current with respect to IFAST_CHG,

TJ 100 °C

—

3.33

—

%/°C

Notes

11.

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

Table 4. BC3770 Electrical Characteristics (continued)

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

BC3770 Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc

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