Rainbow Electronics MAX1625 User Manual
Page 2
kHz
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= V
CC
= D4 = +5V, PGND = AGND = D0–D3 = 0V, R
FREQ
= 33.3k
Ω
,
T
A
= 0°C to +85°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
DD
, V
CC
, PWROK to AGND ......................................-0.3V to 6V
PGND to AGND ..................................................................±0.3V
CSH, CSL to AGND ....................................-0.3V to (V
CC
+ 0.3V)
NDRV, PDRV, DL to PGND.........................-0.3V to (V
DD
+ 0.3V)
REF, CC1, CC2, LG, D0–D4, FREQ,
FB to AGND ................................................-0.3V to (V
CC
+ 0.3V)
BST to PGND ............................................................-0.3V to 12V
BST to LX ....................................................................-0.3V to 6V
DH to LX.............................................(LX - 0.3V) to (BST + 0.3V)
Continuous Power Dissipation (T
A
= ±70°C)
24 Pin SSOP (derate 8.00mW/°C above +70°C) ..........640mW
16 Pin Narrow SO (derate 8.70mW/°C above 70°C).....696mW
Operating Temperature Range
MAX162_E_ _.......................................................-40°C to +85°C
Storage Temperature Range .............................-65°C to +125°C
Lead Temperature (soldering, 10sec) .............................+300°C
R
FREQ
= 33.3k
Ω
R
FREQ
= 20k
Ω
PWROK = 5.5V
V
CC
= V
DD
= 5.5V,
FB overdrive = 200mV
I
SINK
= 2mA, V
CC
= 4.5V
Falling FB, 1% hysteresis with respect to V
REF
V
CC
rising edge, 1% hysteresis
Rising FB, 1% hysteresis with respect to V
REF
V
CC
= V
DD
MAX1624, over line
and load (Note 1)
V
REF
= 0V
Rising edge, 1% hysteresis
0µA < I
LOAD
< 100µA
V
CC
= V
DD
= 5.5V, FB overdrive = 200mV,
operating or standby mode
MAX1625, over line
and load (Note 2)
No load
CONDITIONS
540
600
660
850
1000
1150
Switching Frequency
µA
1
PWROK Output Current High
V
0.4
PWROK Output Voltage Low
6.5
8
9.5
%
-7.5
-6
-4.5
PWROK Trip Level
1
2
1
%
0.5
AC Load Regulation
(Note 3)
±1.5
%
±1
FB Set Voltage
±1.5
2.5
V
CC
Supply Current
V
4.0
4.2
V
4.5
5.5
Input Voltage Range
Input Undervoltage Lockout
%
±1
FB Accuracy
mA
0.5
4.0
Reference Short-Circuit Current
V
2.7
3.0
Reference Undervoltage Lockout
mV
10
Reference Load Regulation
mA
0.3
mA
0.1
V
DD
Supply Current
V
3.465
3.5
3.535
Reference Voltage
UNITS
MIN
TYP
MAX
PARAMETER
Operating mode
Standby mode
T
A
= +25°C to +85°C
T
A
= 0°C to +85°C
T
A
= +25°C to +85°C
T
A
= 0°C to +85°C
CSH - CSL =
0mV to 80mV
R
FREQ
= 200k
Ω
kHz
85
100
115
LG = REF
LG = GND
LG = V
CC
MAX1624
MAX1625
LG = REF
CSH - CSL =
0mV to 80mV
LG = GND
LG = V
CC
0.1
MAX1624
MAX1625
0.2
0.1
%
0.05
DC Load Regulation
(Note 3)