MAX17020ETJ+T Maxim Integrated Products, MAX17020ETJ+T Datasheet - Page 14

• Manufacturer Part Number: MAX17020ETJ+T
• Description: IC CTLR PWM DUAL STEP DN 32-TQFN
• Manufacturer: Maxim Integrated Products
• Series: Quick-PWM™r

Specifications of MAX17020ETJ+T

• Applications: Power Supplies
• Current - Supply: 1mA
• Voltage - Supply: 6 V ~ 24 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
14
PIN
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
8
9
______________________________________________________________________________________
LDOREFIN
PGOOD1
SECFB
NAME
AGND
PGND
OUT1
ILIM1
BST1
BST2
ON1
DH1
BYP
DL1
V
DL2
FB1
LX1
LX2
DD
External Reference Input for the Linear Regulator. LDOREFIN sets the LDO regulation voltage (V
V
output voltage, or connect LDOREFIN to V
to 5V and is enabled, LDO must supply V
Linear Regulator Bypass Input. When BYP voltage exceeds 93.5% of the LDO voltage, the controller
bypasses the LDO output to the BYP input. The bypass switch is disabled if the LDO voltage drops by 8.5%
from its nominal regulation threshold. When not being used, connect BYP to GND.
Output Voltage-Sense Input for SMPS1. OUT1 is an input to the Quick-PWM on-time one-shot timer. OUT1 also
serves as the feedback input for the preset 5V (FB1 = GND) and 1.5V (FB1 = V
Adjustable Feedback Voltage-Sense Connection for SMPS1. Connect FB1 to GND for fixed 5V operation.
Connect FB1 to V
to analog ground to adjust the output voltage between 0.7V and 5.5V.
Valley Current-Limit Adjustment for SMPS1. The GND - LX1 current-limit threshold is 1/10 the voltage present
on ILIM1 over a 0.2V to 2V range. An internal 5µA current source allows this voltage to be set with a single
resistor between ILIM1 and analog ground.
Open-Drain Power-Good Output for SMPS1. PGOOD1 is low when the output voltage is more than 16% (typ) below
the nominal regulation threshold, during soft-start, in shutdown, and after the fault latch has been tripped. After the
soft-start circuit has terminated, PGOOD1 becomes high impedance if the output is in regulation.
Enable Input for SMPS1. Drive ON1 high to enable SMPS1. Drive ON1 low to shut down SMPS1.
High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.
Inductor Connection for SMPS1. Connect LX1 to the switched side of the inductor. LX1 is the lower supply rail
for the DH1 high-side gate driver.
Boost Flying-Capacitor Connection for SMPS1. Connect to an external capacitor as shown in Figure 1. An
optional resistor in series with BST1 allows the DH1 turn-on current to be adjusted.
Low-Side Gate-Driver Output for SMPS1. DL1 swings from PGND to V
Supply-Voltage Input for the DL_ Gate Drivers. Connect to a 5V supply. Also connect to the drain of the BST
diode switch.
Secondary Feedback Input. The secondary feedback input forces the SMPS1 output into ultrasonic mode
when the SECFB voltage drops below its 2V threshold voltage. This forces DL1 and DH1 to switch, allowing
the system to refresh an external low-power charge pump being driven by DL1 (see Figure 1). Connect
SECFB to V
Analog Ground. Connect the backside exposed pad to AGND.
Power Ground
Low-Side Gate-Driver Output for SMPS2. DL2 swings from PGND to V
Boost Flying-Capacitor Connection for SMPS2. Connect to an external capacitor as shown in Figure 1. An
optional resistor in series with BST2 allows the DH2 turn-on current to be adjusted.
Inductor Connection for SMPS2. Connect LX2 to the switched side of the inductor. LX2 is the lower supply rail
for the DH2 high-side gate driver.
LDOREFIN
) for a 0.3V to 2V LDOREFIN range. Connect LDOREFIN to GND for a fixed 5V linear-regulator
CC
to the 5V bias supply to disable secondary feedback.
CC
for fixed 1.5V operation. Connect FB1 to an external resistive voltage-divider from OUT1
CC
CC
and V
for a fixed 3.3V linear-regulator output voltage. When LDO is set
FUNCTION
DD
.
Pin Description (continued)
DD.
DD.
CC
) output voltage settings.
LDO
= 2 x