MAX17000A Maxim Integrated Products, MAX17000A Datasheet - Page 13

• Manufacturer Part Number: MAX17000A
• Description: Complete DDR2 and DDR3 Memory Power-Management Solution
• Manufacturer: Maxim Integrated Products

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PIN
14
15
16
17
18
19
20
21
22
23
24
—
PGND1
NAME
AGND
TON
BST
V
V
______________________________________________________________________________________
DH
LX
DL
EP
DD
CC
Switching Frequency Setting Input. An external resistor between the input power source and this
pin sets the switching frequency per phase according to the following equation:
where C
High-Side Gate-Driver Output. Swings from LX to BST. DH is low when in shutdown or UVLO.
Inductor Connection. Connect LX to the switched side of the inductor as shown in Figure 1.
Boost Flying Capacitor Connection. Connect to an external 0.1μF, 6V capacitor as shown in Figure
1. The MAX17000A contains an internal boost switch.
Synchronous-Rectifier Gate-Driver Output. DL swings from V
Supply Voltage Input for the DL Gate Driver and 3.3V Reference/Analog Supply. Connect to the
system supply voltage (+4.5V to +5.5V). Bypass V
ceramic capacitor.
Power Ground. Ground connection for the low-side MOSFET gate driver.
Analog Ground. Connect backside exposed pad to AGND.
Pulse-Skipping Control Input. This input determines the mode of operation under normal steady-
state conditions and dynamic output-voltage transitions:
Controller Supply Voltage. Connect to a 4.5V to 5.5V source. Bypass V
greater ceramic capacitor.
Shutdown Control Input. Connect to V
MAX17000A slowly ramps down the output voltage to ground. When the internal target voltage
reaches 25mV, the controller forces DL low, and enters the low current (1μA) shutdown state.
When discharge mode is enabled by OVP (OVP = high), the CSL and VTT internal 16
MOSFETs are enabled in shutdown. When discharge mode is disabled by OVP (OVP = low), LX,
VTT, and VTTR are high impedance in shutdown.
A rising edge on
Exposed Pad. Connect backside exposed pad to AGND.
TON is high impedance in shutdown.
T
High (> 2.4V) = Forced-PWM operation
Low (AGND) = Pulse-skipping mode
SW
Complete DDR2 and DDR3 Memory
TON
= C
TON
= 16.26pF.
x (R
TON
Power-Management Solution
clears the fault OV protection latch.
+ 6.5k )
CC
for normal operation. When
FUNCTION
Pin Description (continued)
DD
to power ground with a 1μF or greater
DD
to PGND1.
CC
to AGND with a 1μF or
is pulled low, the
discharge
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