BQ8211
Low Dropout
300mA Voltage Regulator
with Enable
Product Specification
Revision 1.3
September 13, 2006
General Description
The BQ8211 is a low dropout voltage regulator
capable of delivering
300 mA
to the load. It is
adjustable and can set a precise voltage from
1.175V to 15V with two external resistors. The
BQ8211 meets all specifications down to 1.175V
output, unlike CMOS LDO’s which loose
performance with outputs below 2.25V.
The
enable
pin provides a remote turn-off for low
power consumption. It draws virtually zero current
while in shutdown mode.
To assure accuracy within
2% over temperature,
the heart of the BQ8211 is a self-correcting
AcuRef™ bandgap reference.
On-chip current limit and thermal shutdown with
hysteresis protects against any combination of
overload and ambient temperature that might
cause the junction temperature to exceed safe
limits.
Applications
•
Graphic cards and PC motherboards
•
Cell Phones
•
DVD video player
Replacement for:
•
LX8211
Features
•
Low dropout voltage (980mV at
300 mA)
•
Enable pin implements sequencing
•
Vout tolerance less than
2 %
over
•
•
•
•
•
•
temperature
Featured in the very small
SOT-23
package
Stable with low cost 1
µ
F capacitor
Low ground current
Thermal protection with hysteresis
Short circuit protection
RoHS compliant
available
Typical Application
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BQ8211
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BQ8211
Pin Configuration
Pin Descriptions
Pin Name
V
IN
Ground
E
NABLE
Adjust
V
OUT
Function
+ Unregulated Input Voltage, Collector of Pass Transistor
- Ground
Active high, E
NABLE
> 1 V
OFF low, E
NABLE
< 0.25V
Adjust input. Connect to resistive feed back divider.
Regulated Output
Functional Block Diagram
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Rev. 1.3 September 13, 2006
Acutechnology Semiconductor Inc.
BQ8211
Ordering Information
Device
BQ8211
BQ8211
BQ8211
BQ8211
BQ8211
BQ8211
BQ8211
BQ8211
Note:
The
Operating Tj
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
0C˚
≤
125C˚
%Tol
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
PKG Type
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
V
OUT
1.8V
1.8V
2.5V
2.5V
3.3V
3.3V
ADJ
ADJ
Wrap
T&R
T&R
T&R
T&R
T&R
T&R
T&R
T&R
Ordering Number
BQ8211CY-M5-18-TR
BQ8211CY-M5-18-TRL
BQ8211CY-M5-25-TR
BQ8211CY-M5-25-TRL
BQ8211CY-M5-33-TR
BQ8211CY-M5-33-TRL
BQ8211CY-M5-AJ-TR
BQ8211CY-M5-AJ-TRL
TRL parts are Lead Free and RoHS compliant.
Absolute Maximum Ratings
Stress greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These stress ratings only, and functional operation of the device at these or any conditions beyond
those indicated under recommended Operating Conditions is not implied. Exposure to “Absolute Maximum
Rating” for extended periods may affect device reliability. Use of standard ESD handling precautions is
required.
Parameter
Maximum V
IN
Maximum V
ENABLE
Power Dissipation (Internally limited)
Maximum Junction Temperature
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 4 sec.) SOT- 23-5 package
150
-40 to 125
-65 to 150
300
°C
°C
°C
°C
Value
18
Vin + 0.3V
Units
Volts
Volts
Thermal Management
Thermal Resistance (Junction to Ambient)
SOT-23-5 (minimum foot print)
Typical
Value
220
Typical
Value
170
Units
°C/W
Units
°C/W
Thermal Resistance (Junction to Ambient)
SOT-23-5 (Soldered to 1 in
2
1 oz. copper PCB)
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Rev. 1.3 September 13, 2006
Acutechnology Semiconductor Inc.
BQ8211
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range 40ºC <Tj< 125ºC. Ambient temperature
must be de-rated based upon power dissipation and package thermal characteristics. Unless otherwise
specified: V
ENABLE
= 1V, V
IN
= (V
OUT
+ 1.5V), I
OUT
= 10 mA, Tj = 25C. Values in
bold
are over the full
temperature range.
Symbol
VOUT
LNREG
LDREG
Parameter
Output Voltage
(1)
Line Regulation
(1)
Load Regulation
(1)
Conditions
Min
-1
40°C
≤Tj ≤
125°C
∆V
EN
= V
OUT
+ (1.5V to 10V)
∆I
OUT
= (10mA to 300 mA)
I
OUT
= 100 mA
VD
Dropout Voltage
(1, 2)
I
OUT
= 150 mA
I
OUT
= 300 mA
ISC
I
GND
I
GND
VIH
VIL
I
EN
ON
V
ADJ
I
QMIN
TC
TS
V
N
PSRR
TSD
TSD
HYST
Current Limit
(1)
Ground Current ON
Ground Current ON (5)
Enable Pin Voltage (ON)
Enable Pin Voltage (OFF)
Enable Current ON
Reference Voltage
Minimum Load Current (5)
Temperature Coefficient
Temperature Stability
RMS Output Noise
(3)
Ripple Rejection Ratio
(4)
Thermal Shutdown
TSD Hysteresis
Vin = 5V
Junction Temperature
60
Adjustable version
With respect to GND
With respect to GND
V
ENABLE
= V
IN
= 5V
Adjustable version only
0°C
≤Tj ≤
125°C
To maintain regulation
1.163
1.151
0.5
0.005
0.5
0.003
72
150
25
0.25
V
EN
-V
OUT
= 2V
500
-2.0
Typ
V
OUT
V
OUT
0.035
0.2
0.93
0.94
0.98
800
100
65
0.92
0.45
60
1.175
100
1.187
1.199
2.0
150
100
1.0
Max
+1
+2.0
0.2
0.4
1.0
1.0
1.1
Units
%
%
%
%
V
V
V
mA
µA
µA
V
V
µA
V
V
mA
%/°C
%/°C
%
V
OUT
dB
°C
°C
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Measure (V
IN
- V
OUT
) when
∆V
OUT
,
OR
∆V
REF
= 1%
(3) Bandwidth of 10Hz to 10kHz
(4) 120Hz input ripple
(5) Adjustable version only
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Rev. 1.3 September 13, 2006
Acutechnology Semiconductor Inc.
BQ8211
Application Notes
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Rev. 1.3 September 13, 2006
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