MAX1565ETJ-T Maxim Integrated Products, MAX1565ETJ-T Datasheet - Page 6

• Manufacturer Part Number: MAX1565ETJ-T
• Description: DC/DC Switching Converters 5Ch Digital Camera Power Supply
• Manufacturer: Maxim Integrated Products

Small, High-Efficiency, Five-Channel
Digital Still Camera Power Supply
ELECTRICAL CHARACTERISTICS (continued)
(V
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
(Circuit of Figure 1, T
6
FB_ to COMP_
Transconductance
FB_ Input Leakage Current
AUX1 Output Regulation Voltage
DL_ Driver Resistance
LOGIC INPUTS (ON_, FBSEL_)
Input Low Level
Input High Level
FBSEL_ Input Leakage Current
OUTSU
100
_______________________________________________________________________________________
90
80
70
60
50
40
30
20
10
0
1
= 3.3V, T
V
V
V
V
V
The IC is powered from the OUTSU output.
Since the part is powered from OUTSU, a Schottky rectifier, connected from the input battery to OUTSU, is required for
low-voltage startup.
The step-up regulator operates in startup mode until this voltage is reached. Do not apply full load current during startup.
The step-up current limit in startup refers to the LXSU switch current limit, not an output current limit.
The idle-mode current threshold is the transition point between fixed-frequency PWM operation and idle-mode operation
(where switching rate varies with load). The spec is given in terms of inductor current. In terms of output current, the idle-
mode transition varies with input/output voltage ratio and inductor value. For the step-up, the transition output current is
approximately 1/3 the inductor current when stepping from 2V to 3.3V. For the 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.
PARAMETER
IN
IN
IN
IN
IN
= 4V
= 3.6V
= 3V
= 2V
= 1.5V
STEP-UP EFFICIENCY
vs. LOAD CURRENT
LOAD CURRENT (mA)
10
A
(5V OUTPUT)
= -40°C to +85°C, unless otherwise noted.)
A
= +25°C, unless otherwise noted.)
100
V
OUT
FB_ = COMP_
FB_ = 1.25V
FBSEL1 = GND, FB1 connected directly to AUX1 output
Output high
Output low
1.1V < OUTSU < 1.8V (ONSU only)
1.8V < OUTSU < 5.5V
1.1V < OUTSU < 1.8V (ONSU only)
1.8V < OUTSU < 5.5V
FBSEL = 3.6V, OUTSU = 3.6V
FBSEL = GND, OUTSU = 3.6V
= 5V
1000
100
90
80
70
60
50
40
30
20
10
0
1
V
V
V
V
IN
IN
IN
IN
= 3.6V
= 3V
= 2V
= 1.5V
CONDITIONS
STEP-UP EFFICIENCY
vs. LOAD CURRENT
LOAD CURRENT (mA)
(3.3V OUTPUT)
10
Typical Operating Characteristics
100
V
OUT
= 3.3V
1000
100
90
80
70
60
50
40
30
20
10
0
V
OUTSU
-100
4.90
-100
-100
MIN
1
-0.2
1.6
80
INSD CONNECTED TO BATTERY
V
DOES NOT INCLUDE CURRENT USED
BY THE STEP-UP TO POWER THE IC
V
V
V
OUT
IN
IN
IN
= 4.2V
= 3.6V
= 3V
= 1.5V
STEP-DOWN EFFICIENCY
vs. LOAD CURRENT
TYP
LOAD CURRENT (mA)
10
+100
+100
+100
MAX
5.10
185
0.2
0.4
10
5
100
UNITS
µS
nA
nA
Ω
V
V
V
1000