MP1531 – LOW POWER, TRIPLE OUTPUT STEP-UP PLUS CHARGE PUMP FOR TFT BIAS
ELECTRICAL CHARACTERISTICS
(4)
(continued)
V
IN
= 5.0V, T
A
= +25°C, unless otherwise noted.
Parameter
Oscillator
Switching Frequency
Maximum Duty Cycle
Soft-Start Period
Turn-Off Delay
Error Amplifier
Error Amplifier Voltage Gain
Error Amplifier Transconductance
COMP Maximum Output Current
FB1, FB3 Regulation Voltage
FB2 Regulation Voltage
FB1, FB3 Input Bias Current
FB2 Input Bias Current
Reference (REF)
REF Regulation Voltage
REF Load Regulation
Output Switch (SW)
SW On Resistance
SW Current Limit
SW Leakage Current
GL Dropout Voltage
(5)
GH Dropout Voltage
(5)
GL Leakage Current
GH Leakage Current
Thermal Shutdown
I
LIM
V
SW
= 22V
V
GL
= –10V, I
GL
= 10mA
V
GH
= 20V, I
GH
= 10mA
V
IN2
= –15V, V
GL
= GND
V
IN3
= 25V, V
GH
= GND
Symbol Condition
f
SW
D
M
C4 = 10nF
Av
EA
G
m
EA
1.22
–25
V
FB1
= V
FB3
= 1.25V
V
FB2
= 0V
I
REF
= 50µA
0µA < I
REF
< 200µA
V
IN
= 5V
V
IN
= 3V
0.5
1.22
Min
200
85
Typ
250
90
6
3
400
1000
±100
1.25
0
±100
±100
1.25
1
250
400
0.65
0.5
Max
300
Units
KHz
%
ms
µs
V/V
µA/V
µA
V
mV
nA
nA
V
%
mΩ
mΩ
A
µA
V
V
µA
µA
°C
1.28
+25
1.28
1.2
1
0.15
0.5
1
1
160
Notes:
4) Typical values are guaranteed by design, not production tested.
5) Dropout voltage is the input to output differential at which the circuit ceases to regulate against further reduction in input voltage.
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit of Figure 3, unless otherwise noted.
Load Transient
Power-Up Sequencing
V
IN
= 3.3V, V
MAIN
= 5V, I
MAIN
= 100mA,
V
GH
= 15V, I
GH
= 5mA, V
GL
= -10V,
I
GL
= 5mA
Efficiency vs Load Current
Delivered by Step-Up Converter
100
90
V
IN
= 4.2V
V
IN
= 3.3V
V
MAIN
50mV/div
V
IN
= 3.3V, V
MAIN
= 5V,
5mA-50mA Step, V
GH
= 15V,
I
GH
= 5mA, V
GL
= -10V, I
GL
= 5mA
EFFICIENCY (%)
80
70
60
50
40
30
20
0
V
EN
5V/div
V
MAIN
5V/div
V
GH
10V/div
V
GL
10V/div
I
MAIN
50mA/div
V
MAIN
= 5V
100 200 300 400 500 600
LOAD CURRENT (mA)
10ms/div
MP1531 Rev. 1.2
5/22/2006
www.MonolithicPower.com
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© 2006 MPS. All Rights Reserved.
3
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