BL8052

BL8052
+12V, 30mA Flash Memory Programming Supply
DESCRIPTION
FEATURES
The BL8052 is a regulated +12V, 30mA-output,
chargepump DC-DC converter. It provides the
necessary +12V ±5% output to program bytewide flash memories, and requires no inductors
to deliver a guaranteed 30mA output from inputs
as low as 4.75V. It fits into less than 0.1in2 of
board space. The BL8052 is a pin-compatible
upgrade to the BL8052, and is recommended for
new designs. The BL8052 offers lower quiescent
and shutdown currents, and guarantees the
output current over all temperature ranges.
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The BL8052 is the first charge-pump boost
converter to provide a regulated +12V output. It
requires only a few inexpensive capacitors, and
the entire circuit is completely surface-mountable.
A logic-controlled shutdown pin that interfaces
directly with microprocessors reduces the supply
current to only 0.3μA. The BL8052 comes in 8-pin
narrow SO and DIP packages.
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TYPICAL APPLICATION
Regulated +12V ±5% Output Voltage
4.5V to 5.5V Supply Voltage Range
Fits in 0.1in2
Guaranteed 30mA Output
No Inductor—Uses Only 4 Capacitors
95μA Quiescent Current
Logic-Controlled 0.3μA Shutdown
8-Pin Narrow SO and DIP Packages
APPLICATIONS
+12V Flash Memory Programming Supplies
Compact +12V Op-Amp Supplies
Switching MOSFETs in Low-Voltage Systems
Dual-Output +12V and +20V Supplies
PIN OUT & MARKING
BL8052
BL8052
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BL8052
ABSOLUTE MAXIMUM RATING
Parameter
Value
Max Input Voltage
SHDN
Iout Continuous
Max Operating Junction Temperature(TJ)
Ambient Temperature(TA)
Thermal resistance: ΘJA
Storage Temperature(TS)
Lead Temperature & Time
6V
0.3V~(Vin+0.3V)
50mA
125C
-40C – 85C
150°C/W
-40C - 150C
260C, 10S
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Value
Input Voltage Range
Operating Junction Temperature(TJ)
Max. 6V
-20C –125C
ELECTRICAL CHARACTERISTICS For Each Channel
(Vcc=4.5V to 5.5V, TA=25C, unless otherwise noted)
Symbol
Parameter
Vcc
Breakdown Supply
Voltage
Vout
Output Voltage
Icc
fOSC
RSW
VIH
VIL
Supply Current
Shutdown Current
Oscillator Frequency
Power Efficiency
Vcc to Vout Switch
Impedance
Conditions
,
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Max
Iout=77uA
Iout=37uA
2.4
12
95
0.3
620
76.4
2.6
2.7
2.5
V
500
10
0
0
2
uA
uA
kHz
%
kohm
1.3
Vcc=5V, VSHDN=0V
Vcc=VSHDN=5V
Unit
V
12
No load, VSHDN=0V
No load, VSHDN=Vcc
Vcc=4V, Iout=30mA
Vcc=5V, Iout=30mA
Vcc=VSHDN=5V
Typ
9.4
No load, VSHDN=0V
Shutdown Input
Threshold
SHDN Pin Current
Min
V
uA
BL8052
PIN DESCRIPTION
PIN #
NAME
DESCRIPTION
1
2
3
4
5
6
7
C1C1+
C2C2+
Vcc
Vout
GND
8
SHDN
Negative terminal for the first chargepump capacitor
Positive terminal for the first chargepump capacitor
Negative terminal for the second charge-pump capacitor
Positive terminal for the second charge-pump capacitor
Supply Voltage
+12V Output Voltage. VOUT = VCC when in shutdown mode.
Ground
Active-high CMOS-logic level Shutdown Input. SHDN is internally pulled up to VCC.
Connect to GND for normal peration. In shutdown mode, the charge pumps are turned
off and VOUT = VCC.
BLOCK DIAGRAM
C3 must be placed as close to the device aspossible and could be
omitted if very low outputnoise performance are not required.
Figure1 Block Diagram
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BL8052
TYPICAL PERFORMANCE CHARACTERISTICS
(Tested under TA=25C, unless otherwise specified)
EFFICIENCY vs. LOAD CURRENT
90
80
Efficiency(%)
70
60
50
Vcc=5.5V
Vcc=5V
Vcc=4.75V
Vcc=4.5V
Vcc=3.2V
40
30
20
10
0
0
10
20
30
40
50
60
Iout(mA)
OUTPUT VOLTAGE vs. OUTPUT
CURRENT
14
12
Vout(V)
10
8
Vcc=5.5V
Vcc=5V
Vcc=4.75V
Vcc=4.5V
Vcc=3.2V
6
4
2
0
0
10
20
30
40
50
60
Iout(mA)
LOAD TRANSIENT RESPONSE
LINE TRANSIENT RESPONSE
C1: Output Voltage Ripple, Vcc=5.0V
C4: Output Current, Iout=0mA to 30mA
C1: Output Voltage Ripple
C3: Supply Voltage, Vcc=4.5V to 5.5V, Iout=10mA
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BL8052
DETAILED DESCRIPTION
BL8052 is a charge-pump IC. It can provide a 12V regulated output 30mA from voltage input as low as
4.75 without any inductors. It is useful for a wide range of applications and its performances makes it ideal for
flash memory programming supply.
Figure 1 is a simplified block diagram of BL8052. When the S1 switches are closed and the S2 switches
are open, capacitors C1 and C2 are charged up to VCC. And then the S1 switches are opened and the S2
switches are closed, capacitors C1 and C2 are connected in series between VCC and VOUT. A feedback
scheme adjusts the output voltage to 12V ±5%.
A good layout design is strongly recommended for noise reason. Very short connections to the
capacitors should be used for best performance. C3 and C4 must have low ESR in order to minimize the
output ripple. C1 and C2 should use ceramic or tantalum capacitors in the 0.22μF to 1.0μF range.
PACKAGE OUTLINE
Package
SOP8
Devices per reel
2500
Package specification：
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5
Unit
mm