MAX8550-MAX8551 MAXIM [Maxim Integrated Products], MAX8550-MAX8551 Datasheet - Page 2

• Manufacturer Part Number: MAX8550-MAX8551
• Description: Integrated DDR Power-Supply Solutions for Desktops, Notebooks, and Graphic Cards
• Manufacturer: MAXIM [Maxim Integrated Products]

ABSOLUTE MAXIMUM RATINGS
V
V
SHDNA, SHDNB, REFIN to GND..............................-0.3V to +6V
SS, POK1, POK2, SKIP, ILIM, FB to GND ................-0.3V to +6V
STBY, TON, REF, UVP/OVP to GND ........-0.3V to (AV
OUT, VTTR to GND ..................................-0.3V to (AV
DL to PGND1..............................................-0.3V to (V
DH to LX ....................................................-0.3V to (V
LX to BST..................................................................-6V to +0.3V
LX to GND .................................................................-2V to +30V
VTT to GND...............................................-0.3V to (V
ELECTRICAL CHARACTERISTICS
(V
= GND, PGND1 = PGND2 = LX = GND, TON = OPEN, V
are at T
Integrated DDR Power-Supply Solutions for
Desktops, Notebooks, and Graphic Cards
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.
2
MAIN PWM CONTROLLER
Input Voltage Range
Output Adjust Range
Output Voltage Accuracy
(Note 2)
Soft-Start Ramp Time
On-Time
Minimum Off-Time
V
V
AV
AV
Current
AV
Threshold
V
IN
DD,
IN
IN
IN
DD
to GND .............................................................-0.3V to +30V
DD
DD
DD
_______________________________________________________________________________________
= +15V, V
Quiescent Supply Current
Shutdown Supply Current
AV
Quiescent Supply Current
Quiescent Supply Current
+ V
Undervoltage-Lockout
A
DD
= +25°C.) (Note 1)
DD
PARAMETER
, VTTI to GND .........................................-0.3V to +6V
Shutdown Supply
DD
= AV
DD
= V
SHDNA
SYMBOL
V
= V
t
DD
OFF_MIN
I
V
AVDD
I
t
V
VDD
t
, AV
OUT
I
ON
SHDNB
SS
IN
IN
DD
= V
FB = OUT
FB = GND
FB = V
Rising edge of SHDNA to full current limit
V
V
(Note 3)
(Note 3)
SHDNA = SHDNB = GND
All on (PWM, VTT, and VTTR on)
SHDNA = GND (only VTT and VTTR on)
STBY = AV
SHDNB = GND (only PWM on)
SHDNA = SHDNB = GND
Rising edge of V
Hysteresis
Set V
IN
OUT
VTTI
BST
BST
DD
DD
DD
= 15V,
FB
= 1.5V
+ 0.3V)
+ 0.3V)
+ 0.3V)
+ 0.3V)
+ 0.3V)
= V
DD
= 0.8V
VTTS
ILIM
DD
= V
(only VTTR and PWM on)
= 5V, V
CONDITIONS
IN
VTT
VTTS to GND............................................-0.3V to (AV
PGND1, PGND2 to GND .......................................-0.3V to +0.3V
REF Short Circuit to GND ...........................................Continuous
Continuous Power Dissipation (T
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
TON = GND (600kHz)
TON = REF (450kHz)
TON = OPEN (300kHz)
TON = AV
, T
OUT
28-Pin 5mm x 5mm TQFN (derate 35.7mW/°C
above +70°C).................................................................2.86W
A
= -40°C to +85°C, unless otherwise noted. Typical values
= V
REFIN
DD
(200kHz)
= V
VTTI
= 2.5V, UVP/OVP = STBY = FB = SKIP
0.693
MIN
2.47
1.78
170
213
316
461
200
4.5
0.7
4.1
2
A
= +70°C)
TYP
4.25
194
243
352
516
300
0.7
2.5
1.8
1.7
2.5
0.5
25
50
1
2
1
2
1
0.707
MAX
2.53
1.82
219
273
389
571
450
5.5
5.5
4.4
28
40
10
5
5
4
2
1
5
DD
UNITS
+ 0.3V)
mA
mV
ms
µA
µA
µA
µA
ns
ns
V
V
V
V