MAX8537EEI(2004) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8537EEI
(Rev.:2004)
(Rev.:2004)
Maxim Integrated
MAX8537EEI Datasheet PDF : 23 Pages
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Dual-Synchronous Buck Controllers for Point-of-
Load, Tracking, and DDR Memory Power Supplies
Pin Description
PIN
NAME
(MAX8537/
MAX8539)
NAME
(MAX8538)
FUNCTION
1
BST2
BST2
Bootstrap Input to Power Internal High-Side Driver for Step-Down 2. Connect to an
external capacitor and diode according to Figure 1.
2
DH2
DH2
High-Side Gate-Driver Output for Step-Down 2. Swings from LX2 to BST2.
External Inductor Input for Step-Down 2. Connect to the switched side of the inductor.
3
LX2
LX2
LX2 serves as the lower supply-voltage rail for the DH2 high-side gate driver and the
current-limit circuitry.
Output Current-Limit Setting for Step-Down 2. Connect a resistor from ILIM2 to the
4
ILIM2
ILIM2
drain of the step-down 2 high-side MOSFET, or to the junction of the source of the
high-side MOSFET and the current-sense resistor to set the current-limit threshold.
See the Current-Limit Setting section.
5
POK1
POK1
Open-Drain Output. High impedance when step-down 1 is within 12% of its regulation
voltage. POK1 is pulled low in shutdown.
6
DL2
DL2
Low-Side Gate-Driver Output for Step-Down 2. Swings from PGND to VL.
7
POK2
POK2
Open-Drain Output. High impedance when step-down 2 is within 12% of its regulation
voltage. POK2 is pulled low in shutdown or if REFIN is undervoltage.
8
EN2
EN2
Enable Input for Step-Down 2 (also for VTTR for the MAX8537 and MAX8539)
9
EN1
EN1
Enable Input for Step-Down 1
Frequency Adjust. Connect a resistor from this pin to ground to set the frequency. The
10
FREQ
FREQ range of the FREQ resistor is 163kΩ, 20kΩ, and 100kΩ (corresponding to 1.4MHz,
1.0MHz, and 200kHz).
11
COMP2
COMP2 Compensation Pin for Step-Down 2. Connect to compensation networks.
12
FB2
FB2
Feedback Input for Step-Down 2 with VREFIN as the Threshold. User must have
impedance <40kΩ.
13
SS2
SS2
Soft-Start for Step-Down 2. Connect a capacitor to GND to set the soft-start time.
Reference Input for VTT and VTTR. Connect it to a resistor-divider from VDDQ. REFIN
REFIN
—
common-mode voltage range is 0.5V to 2.5V. Current through the divider-resistors
14
must be ≥100µA.
—
N.C.
For the MAX8538, connect pin 14 to GND.
15
GND
GND
Analog Ground for Internal Circuitry
16
SS1
SS1
Soft-Start for Step-Down 1. Connect a capacitor to GND to set the soft-start time.
17
FB1
FB1
Feedback Input for Step-Down 1 with 0.8V Threshold. User must have impedance
<40kΩ.
18
COMP1
COMP1 Compensation Pin for Step-Down 1. Connect to compensation networks.
19
VTTR
—
VTTR Output Capable of Sourcing and Sinking Up to 15mA. Always bypass with a 1µF
ceramic capacitor (or larger) to GND.
—
GND
Analog Ground for Internal Circuitry
20
AVL
AVL
Analog VL Input Pin. Connect to VL through a 4.7Ω resistor. Bypass with a 0.1µF (or
larger) ceramic capacitor to GND.
21
V+
V+
Input Supply Voltage
_______________________________________________________________________________________ 7
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