Datasheet

bq76925
www.ti.com SLUSAM9B –JULY 2011– REVISED DECEMBER 2011
3.3 V Voltage Regulator
PARAMETER TEST CONDITION MIN TYP MAX UNIT
3.3 V VOLTAGE REGULATOR
V
CTL
Regulator control voltage
(1)(2)
Measured at VCTL, V3P3 regulating 3.3 26.4 V
V
V3P3
Regulator output Measured at V3P3, I
REG
= 0 to 4 mA, 3.2 3.3 3.4 V
BAT = 4.2 to 26.4 V
I
REG
V3P3 output current 4.0 mA
I
SC
V3P3 short circuit current limit V3P3 = 0.0 V 10.0 17.0 mA
V
TB
Thermistor bias voltage Measured at VTB, I
TB
= 0 V
V3P3
V
I
TB
Thermistor bias current 1.0 mA
R
TB
Thermistor bias internal resistance R
DS,ON
for internal FET switch, I
TB
= 1.0 mA 90 130 Ω
(1) When a bypass FET is used to supply the regulated 3.3V load current, VCTL automatically adjusts to keep V3P3 = 3.3 V. Note that
V
CTL,MIN
and the FET V
GS
will determine the minimum BAT voltage at which the bypass FET will operate.
(2) If VCTL is tied to BAT, the load current is supplied through V3P3.
Voltage Reference
PARAMETER TEST CONDITION MIN TYP MAX UNIT
VOLTAGE REFERENCE
Before gain correction, T
A
= 25°C REF_SEL = 0 1.44 1.56 V
REF_SEL = 1 2.88 3.12
V
REF
Voltage reference output
After gain correction,
(1)
T
A
= 25°C REF_SEL = 0 –0.1% 1.5 +0.1%
REF_SEL = 1 –0.1% 3.0 +0.1%
VCOUT_SEL = 2 –0.9% 0.5 × +0.9% V
V
REF
Reference calibration VCOUT_SEL = 3 –0.5% 0.85 × +0.5%
V
REF_CAL
Measured at VCOUT
voltage V
REF
(0.85 × V
REF
) – (0.5 –0.3% 0.35 × +0.3%
V
× V
REF
) V
REF
∆V
REF
Voltage reference tolerance T
A
= 0 – 50°C –40 40 ppm/
°C
I
REF
VREF output current 10 µA
(1) Gain correction factor determined at final test and stored in non-volatile storage. Gain correction is applied by Host controller.
Cell Voltage Amplifier
PARAMETER TEST CONDITION MIN TYP MAX UNIT
REF_SEL = 0 –1.6% 0.3 1.5%
G
VCOUT
Cell voltage amplifier gain Measured from VCn to VCOUT
REF_SEL = 1 –1.6% 0.6 1.5%
O
VCOUT
Cell voltage amplifier offset Measured from VCn to VCOUT –16 15 mV
REF_SEL = 0 1.47 1.5 1.53 V
Measured at VCOUT, VCn = 5.0 V
V
COUT
Cell voltage amp output range
(1)
REF_SEL = 1 2.94 3.0 3.06 V
Measured at VCOUT, VCn = 0.0 V 0.0 V
VCn = 1.4 V to 4.4 V, After T
A
= 25°C –3 3
correction,
(2)
T
A
= 0°C to 50°C –5 5
∆V
COUT
Cell voltage amplifier accuracy mV
Measured at VCOUT
(3)
T
A
= –25°C to 85°C –8 8
REF_SEL = 1
(4)
I
VCOUT
VCOUT output current
(5)
10 µA
t
VCOUT
Delay from VCn select to VCOUT Output step of 200 mV. C
OUT
= 0.1 µF 100 µs
(1) For VCn values greater than 5.0 V, VCOUT clamps at approximately V3P3.
(2) Correction factor determined at final test and stored in non-volatile storage. Correction is applied by Host controller.
(3) Output referred. Input referred accuracy is calculated as ∆V
COUT
/ G
VCOUT
(e.g. 3 / 0.6 = 5).
(4) Correction factors are calibrated for gain of 0.6. Tolerance at gain of 0.3 is approximately doubled. Contact TI for information on devices
calibrated to a gain of 0.3.
(5) Max DC load for specified accuracy.
Copyright © 2011, Texas Instruments Incorporated Submit Documentation Feedback 7
Product Folder Link(s): bq76925