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ML1565QFNG Datasheet(PDF) 6 Page - Minilogic Device Corporation Limited

Part # ML1565QFNG
Description  Step-Up-Down DC-DC Converts
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Manufacturer  MINILOGIC [Minilogic Device Corporation Limited]
Direct Link  http://www.minilogic.com.hk
Logo MINILOGIC - Minilogic Device Corporation Limited

ML1565QFNG Datasheet(HTML) 6 Page - Minilogic Device Corporation Limited

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P6/21
Rev. C, Sep 2005
ML1565
Step-Up DC-DC Converter
Parameter
Condition
Min
Typ.
Max
Unit
Step-Up Startup-to-Normal
Operating Threshold
Rising or falling edge (Note 4)
2.30
2.60
V
Step-Up Voltage Adjust Range
2.7
5.5
V
FBSU Regulation Voltage
1.225
1.275
V
OUTSU Regulation Voltage
FBSELSU = GND
3.283
3.417
V
FBSU to COMPSU Transconductance
FBSU = COMPSU
80
185
µS
FBSU Input Leakage Current
FBSU = 1.25V
-100
+100
nA
Burst Mode Trip Level
(Note 6)
150
275
mA
Step-Up Maximum Duty Cycle
FBSU = 1V
80
90
%
OUTSU Leakage Current
VLX = 0V, OUTSU = 5.5V
20
µA
LXSU Leakage Current
VLXSU = VOUT = 5.5V
20
µA
N-channel
150
Switch On-Resistance
P-channel
250
mΩ
N-Channel Current limit
1.6
2.4
A
Auxiliary DC-DC Controllers
(Aux 1, 2, and 3)
Parameter
Condition
Min
Typ.
Max
Unit
Maximum Duty Cycle
FB_ = 1V
80
90
%
FB_ Regulation Voltage
FB_ = COMP_
1.225
1.275
V
FB_ to COMP_
Transconductance
FB_ = COMP_
80
185
µS
FB_ Input Leakage Current
FB_ = 1.25V
-100
+100
nA
AUX1 Output Regulation Voltage
FBSEL1 = GND. FB1 connected directly to AUX1 output
4.90
5.10
V
Output high
10
DL_ Driver Resistance
Output low
5
Logic Inputs (ON_, FBSEL)
Parameter
Condition
Min
Typ.
Max
Unit
1.1V < OUTSU < 1.8V (ONSU only)
0.2
Input Low Level
1.8V < OUTSU < 5.5V
0.4
V
1.1V < OUTSU < 1.8V (ONSU only)
VOUTSU
-0.2
Input High Level
1.8V < OUTSU < 5.5V
1.6
V
FBSEL = 3.6V, OUTSU = 3.6V
-100
+100
FBSEL_ Input Leakage Current
FBSEL = GND, OUTSU = 3.6V
-100
+100
nA
Note 2:
The IC is powered from the OUTSU output.
Note 3:
Since the part is powered from OUTSU, a Schottky rectifier, connected from the input battery to OUTSU, is required
for low-voltage startup.
Note 4:
The step-up regulator operates in startup mode until this voltage is reached. Do not apply full load current during
startup.
Note 5:
The step-up current limit in startup refers to the LXSU switch current limit, not an output current limit.
Note 6:
The burst mode current threshold is the transition point between fixed-frequency PWM operation and burst mode
operation (where switching rate varies with load). The spec is given in terms of inductor current. In terms of output
current, the burst mode transition varies with input/output voltage ratio and inductor value. For step-up, the transition
output current is approximately 1/3 the inductor current when stepping from 2V to 3.3V. For step-down, the transition
current in terms of output current is approximately 3/4 the inductor current when stepping down from 3.3V to 1.8V.


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