MAX8538EEI+ Maxim Integrated Products, MAX8538EEI+ Datasheet - Page 2

• Manufacturer Part Number: MAX8538EEI+
• Description: IC CNTRLR BUCK DUAL 28-QSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX8538EEI+

• Applications: Controller, DDR
• Voltage - Input: 4.5 ~ 23 V
• Number Of Outputs: 2
• Voltage - Output: 0.8 ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-QSOP
• Output Voltage: 0.8 V to 3.6 V
• Output Current: 30 A
• Input Voltage: 4.5 V to 23 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Case: SSOP
• Dc: 05+
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +25V
AVL, VL to GND........................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
FB_, EN_, POK_ to GND...........................................-0.3V to +6V
REFIN, VTTR, FREQ, SS_, COMP_ to GND....-0.3V to (AVL + 0.3V)
BST_, ILIM_ to GND ...............................................-0.3V to +30V
DH1 to LX1 ...............................................-0.3V to (BST1 + 0.3V)
DH2 to LX2 ...............................................-0.3V to (BST2 + 0.3V)
LX_ to BST_ ..............................................................-6V to +0.3V
Dual-Synchronous Buck Controllers for Point-of-
Load, Tracking, and DDR Memory Power Supplies
ELECTRICAL CHARACTERISTICS
(V+ = 12V, EN_ = VL, BST_ = 6V, LX_ = 1V, VL load = 0mA, C
0V, C
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.
2
GENERAL
V+ Operating Range
V+/ VL Operating Range
V+ Operating Supply Current
V+ Standby Supply Current
VL REGULATOR
Output Voltage
VL Undervoltage-Lockout Trip
Level
Output Current
Thermal Shutdown
CURRENT-LIMIT THRESHOLD (all current limits are tested at V+ = VL = 4.5V and 5.5V)
ILIM Sink Current
SOFT-START
Soft-Start Source Current
Soft-Start Sink Current
Soft-Start Full-Scale Voltage
FREQUENCY
Low End of Range
Intermediate Range
High End of Range
Maximum Duty Cycle
_______________________________________________________________________________________
SS
= 10nF, C
PARAMETER
VTTR
= 1µF, R
FREQ
VL regulator drops out below 5.5V (Note 1)
VL is externally generated (Note 1)
IL(VL) = 0, FB_ forced 50mV above threshold
IL(VL) = 0, BST_ = VL, EN = LX_ = FB_ = 0V
5.5V < V+ < 23V, 1mA < I
Rising edge, hysteresis = 550mV (typ) (trip level is
typically 85% of VL)
This is for gate current of DL_ /DH_ drivers, C(VL) =
1µF/10mA ceramic capacitor
Rising temperature, typical hysteresis = 10°C
ILIM_ = LX - 200mV, 1.8V < LX < 23V, BST = LX +5V
SS_ = 100mV
SS_ = 0.8 or REFIN
R
R
R
R
R
R
= 20kΩ, DH_ = open, DL_ = open, POK_ = open, circuit of Figure 1, T
FREQ
FREQ
FREQ
FREQ
FREQ
FREQ
= 100kΩ, V+ = VL = 5V
= 20kΩ, V+ = VL = 5V
= 14.3kΩ, V+ = VL = 5V
= 100kΩ
= 20kΩ
= 14.3kΩ
CONDITIONS
LOAD
VL
= 10µF (ceramic), REFIN = 1.25V, PGND = AGND = FB_ = ILIM_ =
< 70mA
LX_ to GND................................................................-2V to +25V
DL_ to PGND ................................................-0.3V to (VL + 0.3V)
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
28-Pin QSOP (derate 10.8mW/°C above +70°C)........860mW
1120
MIN
4.75
4.18
180
160
800
4.5
4.5
95
80
72
-7
3
A
= +70°C)
REFIN
0.8 or
+160
1000
1400
TYP
350
200
200
3.5
4.3
A
-5
5
5
= 0°C to +85°C, unless
MAX
1200
1680
23.0
5.25
4.42
700
220
240
5.5
70
-3
7
7
UNITS
kHz
kHz
kHz
mA
mA
µA
°C
µA
µA
µA
%
V
V
V
V
V