Datasheet

MAX1856
Wide Input Range, Synchronizable,
PWM SLIC Power Supply
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= SYNC/SHDN, V
CC
= 5V, V
LDO
= 5V, R
OSC
= 200kΩ, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
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.
V
CC
, SYNC/SHDN to GND .....................................-0.3V to +30V
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
+ 0.3V)
LDO Output Current............................................-1mA to +20mA
LDO Short Circuit to GND ...............................................<100ms
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW
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
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
PWM CONTROLLER
328V
Operating Input Voltage Range V
CC
V
CC
= V
LDO
2.7 5.5 V
FB Input Current I
FB
V
FB
= -0.05V 1 50 nA
Load Regulation V
CS
= 0 to 100mV for 0 to I
LOAD(MAX)
0.013 %/mV
Line Regulation Typically 0.0074% per % duty factor on EXT 0.0074 %/%
Current-Limit Threshold V
CS
85 100 115 mV
CS Input Current I
CS
CS = GND 1 µA
Idle Mode Current-Sense
Threshold
51525mV
V
CC
Supply Current (Note 1) I
CC
V
FB
= -0.05V, V
CC
= 3V to 28V 250 400 µA
Shutdown Supply Current SYNC/SHDN = GND, V
CC
= 28V 3.5 6 µA
REFERENCE AND LDO REGULATOR
5V ≤ V
CC
≤ 28V 4.50 5.00 5.50
LDO Output Voltage V
LDO
R
LDO
= 400Ω
3V ≤ V
CC
≤ 28V 2.65 5.50
V
Undervoltage Lockout
Threshold
V
UVLO
V
LDO
falling edge, 1% hysteresis (typ) 2.40 2.50 2.60 V
REF to FB Voltage (Note 2) V
REF
R
REF
= 10kΩ, C
REF
= 0.22µF 1.225 1.250 1.275 V
REF Load Regulation I
REF
= 0 to 400µA -2 -10 mV
REF Undervoltage Lockout
Threshold
Rising edge, 1% hysteresis (typ) 1.0 1.1 1.2 V
OSCILLATOR
R
OSC
= 100kΩ ±1% 425 500 575
R
OSC
= 200kΩ ±1% 225 250 275
Oscillator Frequency f
OSC
R
OSC
= 500kΩ ±1% 85 100 115
kHz
R
OSC
= 100kΩ ±1% 86 90 94
R
OSC
= 200kΩ ±1% 87 90 93
Maximum Duty Cycle D
R
OSC
= 500kΩ ±1% 86 90 94
%