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BL8022
800mA 1.5MHz 7V Synchronous Buck Converter
DESCRIPTION
The BL8022 is a high-efficiency, DC-to-DC stepdown switching regulators, capable of delivering up to 800mA of output current. The device operates from an input voltage range of 2.6V to 7.0V and provides an output voltage from 0.6V to VIN, making the BL8022 ideal for low voltage power conversions. Running at a fixed frequency of 1.5MHz allows the use of small external components, such as ceramic input and output caps, as well as small inductors, while still providing low output ripples. This low noise output along with its excellent efficiency achieved by the internal synchronous rectifier, making BL8022 an ideal green replacement for large power consuming linear regulators. Internal soft-start control circuitry reduces inrush current. Short-circuit and thermaloverload protection improves design reliability.
BL8022 is housed in a SOT23-5 Package
FEATURES
High Efficiency: Up to 96% Capable of Delivering 800mA 1.5MHz Switching Frequency No External Schottky Diode Needed Low dropout 100% Duty operation Internal Compensation and Soft-Start Current Mode control 0.6V Reference for Low Output voltages Logic Control Shutdown (IQ<1uA) Thermal shutdown and UVLO Available in SOT23-5
APPLICATIONS
Cellular phones Digital Cameras MP3 and MP4 players Set top boxes Wireless and DSL Modems USB supplied Devices in Notebooks Portable Devices
TYPICAL APPLICATION
VIN 2.6V to 7V
10uF
IN SW
BLLC83042026
EN FB GND
2.2uH
VOUT 1.81V.8/V80/10AmA
240K
10uF
120K
PIN OUT & MARKING
1.81V/.88V00/1mAA Step-Down Converter
GG: Product Code YW: Date code (Year & Week)
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BL8022
ORDERING INFORMATION
PART No. BL8022CB5TR
PACKAGE SOT23-5
Tape&Reel 3000/Reel
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
7V
Max Operating Junction Temperature(Tj)
125C
Ambient Temperature(Ta)
-40C – 85C
Maximum Power Dissipation SOT23-5
400mW
Storage Temperature(Ts)
-40C - 150C
Lead Temperature & Time
260C, 10S
ESD (HBM)
>2000V
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Input Voltage Range Operating Junction Temperature(Tj)
Value
Max.7V -20C –125C
ELECTRICAL CHARACTERISTICS
(VDD=5V, TA=25C)
Symbol
Parameter
Conditions
VDD Vref Ifb
Iq
LnReg LdReg Fsoc RdsonP RdsonN Ilimit
Iswlk
Ienlk Vh_en Vl_en
Input Voltage Range Feedback Voltage Feedback Leakage current
Quiescent Current
Line Regulation Load Regulation Switching Frequency PMOS Rdson NMOS Rdson Peak Current Limit
SW Leakage Current
EN Leakage Current EN Input High Voltage EN Input Low Voltage
Vin=5V Active, Vfb=0.65, No Switching Shutdown Vin=2.7V to 5.5V Iout=0.01 to 1A
Vout=5.5V, VSW=0 or 5.5V, EN=0V
Min
2.6 0.585
0.8 1.5
Typ
0.6 0.1 35
0.04 0.1 1.5 300 220 1.5
Max
7.0 0.615
0.4
1 0.2 0.2
400 300
2 10 1
0.4
Unit
V
V uA uA uA %/V %/A MHz mohm mohm A
uA
uA V V
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BL8022
PIN DESCRIPTION
PIN # 1 2 3 4 5
NAME EN GND SW IN FB
DESCRIPTION Enable pin for the IC. Drive the pin to high to enable the part, and low to disable Ground Inductor connection. Connect an inductor between SW and the regulator output. Supply voltage. Feedback input. Connect an external resistor divider from the output to FB and GND to set the output to a voltage between 0.6V and Vin
ELECTRICAL PERFORMANCE
Tested under TA=25C, unless otherwise specified
Efficiency (%)
Efficiency VS Load Current,
Vout=1.8V
100 95 90 85 80 75 70 65 60 55 50 45 40 35
0
Vin=4.2V Vin=3.6V Vin=2.7V
100 200 300 400 500 600 700 800 900 1000
Load Current (mA)
Efficiency VS Load Current,
Vout=1.2V
100 95 90 85 80 75 70 65 60 55 50 45 40 35
0
Vin=4.2V Vin=3.6V Vin=2.7V
100 200 300 400 500 600 700 800 900 1000 Load Current (mA)
Efficiency (%)
Efficiency VS Load Current,
Vout=2.5V
100 95 90 85 80 75 70 65 60 55 Vin=4.2V 50 Vin=3.6V 45 Vin=2.7V 40 35
0 100 200 300 400 500 600 700 800 900 1000
Load Current (mA)
Efficiency (%)
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Output Ripple and SW at no load Vin=5V / Vout=2.5V
BL8022
Output Ripple and SW at 1A load Vin=5V / Vout=2.5V
BLOCK DIAGRAM
IN
0.6V Ref
UVLO & Thermal shutdown
+
+
EA
EN
-Σ Comp Network
OSC
FB
Slope Comp
+
ISense
-
PWM Logic
AntiShootThrough
Driver
+
Vcomp
-
SW GND
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BL8022
DETAILED DESCRIPTION
The BL8022 high-efficiency switching regulator is a small, simple, DC-to-DC step-down converter capable of delivering up to 1A of output current. The device operates in pulse-width modulation (PWM) at 1.5MHz from a 2.6V to 5.5V input voltage and provides an output voltage from 0.6V to VIN, making the BL8022 ideal for on-board postregulation applications. An internal synchronous rectifier improves efficiency and eliminates the typical Schottky free-wheeling diode. Using the on resistance of the internal high-side MOSFET to sense switching currents eliminates current.