Datasheet

MAX8632
Integrated DDR Power-Supply Solution for
Desktops, Notebooks, and Graphic Cards
_______________________________________________________________________________________ 5
Note 1: Specifications to -40°C are guaranteed by design, not production tested.
Note 2: When the inductor is in continuous conduction, the output voltage has a DC regulation level higher than the error-compara-
tor threshold by 50% of the ripple. In discontinuous conduction, the output voltage has a DC regulation level higher than the
trip level by approximately 1.5% due to slope compensation.
Note 3: On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, V
BST
= 5V,
and a 250pF capacitor connected from DH to LX. Actual in-circuit times may differ due to MOSFET switching speeds.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LINEAR REGULATORS (VTTR AND VTT)
VTTI Input Voltage Range V
VTTI
1 2.8 V
VTTI Supply Current I
VTTI
I
VTT
= I
VTTR
= 0
<0.1
1mA
VTTI Shutdown Current SHDN = GND 10 µA
REFIN Input Impedance V
REFIN
= 2.5V 12 20 30 kΩ
REFIN Range V
REFIN
1
2.8
V
VTT, VTTR UVLO Threshold
(Measured at OUT)
0.01
0.1
0.20
V
Soft-Start Charge Current I
SS
V
SS
= 0 4 µA
VTT Internal MOSFET High-Side
On-Resistance
I
VTT
= -100mA, V
VTTI
= 1.5V,
AV
DD
= 4.5V
0.3 Ω
VTT Internal MOSFET Low-Side
On-Resistance
I
VTT
= 100mA, AV
DD
= 4.5V 0.3 Ω
VTT Output Accuracy
(Referred to V
REFIN
/ 2)
V
REFIN
= 1.5V or 2.5V, I
VTT
= 1mA -1 +1 %
V
REFIN
= 2.5V, I
VTT
= 0 to ±1.5A 1.3
VTT Load Regulation
V
REFIN
= 1.5V, I
VTT
= 0 to ±1A 1.3
%
VTT Current Limit VTT = 0 or VTTI ±3 ±5
±6.5
A
VTTS Input Current I
VTTS
V
VTTS
= 1.5V, VTT open
0.1
1µA
VTTR Output Error
(Referred to V
REFIN
/ 2)
V
REFIN
= 1.5V or 2.5V, I
VTTR
= 0 -1 +1 %
VTTR Current Limit V
VTTR
= 0 or V
VTTI
±18 ±32 ±50
mA
VTTR Bias Current V
REFIN
= V
VTTI
= 0 0.6 4 µA
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= +15V, V
DD
= AV
DD
= V
SHDN
= STBY = V
BST
= V
ILIM
= 5V, V
OUT
= V
REFIN
= V
VTTI
= 2.5V, UVP/OVP = TP0 = FB = SKIP
= GND, PGND1 = PGND2 = LX = GND, TON = OPEN, V
VTTS
= V
VTT
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values
are at T
A
= +25°C.) (Note 1)