MAX1856 Maxim, MAX1856 Datasheet - Page 2

• Manufacturer Part Number: MAX1856
• Description: Wide Input Range / Synchronizable / PWM SLIC Power Supply
• Manufacturer: Maxim

ABSOLUTE MAXIMUM RATINGS
V
PGND to GND .......................................................-0.3V to +0.3V
LDO, FREQ, FB, CS to GND.....................................-0.3V to +6V
EXT, REF to GND......................................-0.3V to (V
LDO Output Current............................................-1mA to +20mA
LDO Short Circuit to GND ...............................................<100ms
REF Short Circuit to GND ...........................................Continuous
Wide Input Range, Synchronizable,
PWM SLIC Power Supply
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
2
CC
PWM CONTROLLER
Operating Input Voltage Range
FB Input Current
Load Regulation
Line Regulation
Current-Limit Threshold
CS Input Current
Idle Mode Current-Sense
Threshold
V
Shutdown Supply Current
REFERENCE AND LDO REGULATOR
LDO Output Voltage
Undervoltage Lockout
Threshold
REF to FB Voltage (Note 2)
REF Load Regulation
REF Undervoltage Lockout
Threshold
OSCILLATOR
Oscillator Frequency
Maximum Duty Cycle
CC
CC
, SYNC/SHDN to GND .....................................-0.3V to +30V
_______________________________________________________________________________________
= SYNC/SHDN, V
Supply Current (Note 1)
PARAMETER
CC
= 5V, V
LDO
= 5V, R
SYMBOL
V
V
V
f
V
V
UVLO
I
OSC
I
I
LDO
CC
REF
CS
FB
D
CC
CS
OSC
= 200kΩ, T
V
V
V
Typically 0.0074% per % duty factor on EXT
CS = GND
V
SYNC/SHDN = GND, V
R
V
R
I
Rising edge, 1% hysteresis (typ)
R
R
R
R
R
R
REF
CC
FB
CS
FB
LDO
LDO
REF
OSC
OSC
OSC
OSC
OSC
OSC
LDO
= -0.05V
= -0.05V, V
= 0 to 100mV for 0 to I
= V
= 0 to 400µA
= 10kΩ, C
= 400Ω
falling edge, 1% hysteresis (typ)
= 100kΩ ±1%
= 200kΩ ±1%
= 500kΩ ±1%
= 100kΩ ±1%
= 200kΩ ±1%
= 500kΩ ±1%
+ 0.3V)
LDO
A
= 0°C to +85°C. Typical values are at T
CONDITIONS
CC
REF
= 3V to 28V
Continuous Power Dissipation (T
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
= 0.22µF
5V ≤ V
3V ≤ V
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
CC
= 28V
LOAD(MAX)
CC
CC
≤ 28V
≤ 28V
1.225
4.50
2.65
2.40
A
MIN
425
225
2.7
1.0
85
85
86
87
86
3
5
= +25°C, unless otherwise noted.)
A
= +70°C)
0.0074
0.013
1.250
TYP
5.00
2.50
100
250
500
250
100
3.5
1.1
15
90
90
90
-2
1
1.275
MAX
5.50
5.50
2.60
115
400
575
275
115
5.5
-10
1.2
28
50
25
94
93
94
1
6
UNITS
%/mV
%/%
kHz
mV
mV
mV
nA
µA
µA
µA
%
V
V
V
V
V
V