MAX1980ETP+ Maxim Integrated Products, MAX1980ETP+ Datasheet - Page 10

• Manufacturer Part Number: MAX1980ETP+
• Description: IC CNTRLR QUICK-PWM 20-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1980ETP+

• Pwm Type: Controller
• Number Of Outputs: 1
• Frequency - Max: 550kHz
• Duty Cycle: 50%
• Voltage - Supply: 4 V ~ 28 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 20-TQFN Exposed Pad
• Frequency-max: 550kHz
• Input Voltage: 4 V to 28 V
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 100 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Quick-PWM Slave Controller with
Driver Disable for Multiphase DC-DC Converter
10
PIN
10
11
12
13
14
15
16
______________________________________________________________________________________
1
2
3
4
5
6
7
8
9
NAME
COMP
PGND
CM+
GND
TON
CM-
CS+
POL
V
V
BST
CS-
DD
DH
DL
LX
DD
CC
Master Controller’s Positive Current-Sense Input
Master Controller’s Negative Current-Sense Input
On-Time Selection Control Input. This is a three-level input used to determine the DH on time (see the
On-Time Control and Active Current Balancing section). Connect TON as follows for the indicated
switching frequencies:
GND = 550kHz
floating = 300kHz
V
The sl ave contr ol l er ’ s sw i tchi ng fr eq uency shoul d b e sel ected to cl osel y m atch the fr eq uency of the m aster
P WM contr ol l er .
Slave Controller’s Negative Current-Sense Input
Slave Controller’s Positive Current-Sense Input
Current Balance Compensation. Connect a series resistor and capacitor between COMP and OUT. See
the Current Balance Compensation section.
TRIG P ol ar i ty S el ect Inp ut. C onnect P OL to V
op er ati on) . C onnect P OL to GN D to tr i g g er on the fal l i ng ed g e of TRIG ( i n- p hase op er ati on) .
Analog Ground. Connect the QFN’s exposed pad to analog ground.
Power Ground
Low-Side Gate-Driver Output. DL swings from PGND to V
standby mode or the drivers are disabled (DD = low).
Supply Voltage Input for the DL Gate Driver. Connect to the system supply voltage (4.5V to 5.5V).
Bypass to PGND with a 1µF or greater ceramic capacitor, as close to the IC as possible.
Analog Supply Voltage Input for PWM Core. Connect V
through a series 10Ω resistor. Bypass to GND with a 0.22µF or greater ceramic capacitor, as close to
the IC as possible.
Driver Disable Input. A logic low disables the MAX1980 slave controller by forcing DL and DH low. This
reduces the number of phases, allowing single-phase operation for low-power states. Connect to V
for normal operation.
High-Side Gate-Driver Output. DH swings from LX to BST.
Inductor Connection. Connect LX to the switched side of the inductor. LX serves as the lower supply rail
for the DH high-side gate driver.
Boost Flying-Capacitor Connection. Connect to an external capacitor and diode according to the
Standard Application Circuit (Figure 1). An optional resistor in series with BST allows DH pullup current
to be adjusted.
CC
= 200kHz.
C C
DESCRIPTION
or fl oat to tr i g g er on the r i si ng ed g e of TRIG ( out- of- p hase
CC
DD
to the system supply voltage (4.5V to 5.5V)
. DL is forced low when the MAX1980 enters
Pin Description
CC