MAX17020ETJ+T Maxim Integrated Products, MAX17020ETJ+T Datasheet - Page 13

• 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

(Circuit of Figure 1, V
PIN
1
2
3
4
5
6
7
ONLDO
NAME
TON
RTC
LDO
REF
V
IN
6.5A
0.5A
3.3V
CC
0A
A. LOAD CURRENT, 5A/div
B. 3.3V SMPS OUTPUT, 100mV/div
C. INDUCTOR CURRENT, 5A/div
______________________________________________________________________________________
IN
2V Reference-Voltage Output. Bypass REF to AGND with a 0.1µF or greater ceramic capacitor. The
reference can source up to 50µA for external loads. Loading REF degrades output-voltage accuracy
according to the REF load-regulation error. The reference shuts down when ON1, ON2, and ONLDO are all
pulled low.
Switching-Frequency Setting Input. Select the OUT1/OUT2 switching frequencies by connecting TON as
follows for:
Analog Supply Voltage Input. Connect V
bypass to analog ground using a 1µF or greater ceramic capacitor.
Enable Input for LDO. Drive ONLDO high to enable the linear regulator (LDO) output. Drive ONLDO low to
shut down the linear regulator output.
3.3V Always-On Linear Regulator Output for RTC Power. Bypass RTC with a 1µF or greater ceramic
capacitor to analog ground. RTC can source at least 5mA for external load support. RTC power-up is
required for controller operation.
Power-Input Supply. IN powers the linear regulators (RTC and LDO) and senses the input voltage for the
Quick-PWM on-time one-shot timers. The high-side MOSFET’s on-time is inversely proportional to the input
voltage. Bypass IN with a 0.1μF or greater ceramic capacitor to PGND close to the MAX17020.
Linear Regulator Output. Bypass LDO with a 4.7µF or greater ceramic capacitor. LDO can source at least
100mA for external load support. LDO is powered from IN and its regulation threshold is set by LDOREFIN.
For preset 5V operation, connect LDOREFIN directly to GND. For preset 3.3V operation, connect LDOREFIN
directly to V
3.3V SMPS LOAD TRANSIENT
= 12V, V
High (V
Open (REF) = 400kHz/300kHz
GND = 400kHz/500kHz
Dual Quick-PWM Step-Down Controller
with Low-Power LDO, RTC Regulator
DD
CC
40μs/div
) = 200kHz/300kHz
CC
= V
. When LDO is used for 5V operation, LDO must supply V
CC
= 5V, TON = REF, T
MAX17020 toc21
Typical Operating Characteristics (continued)
A
B
C
A
CC
= +25°C, unless otherwise noted.)
to the system supply voltage with a series 50
FUNCTION
7V
5V
5V
5V
A. INPUT VOLTAGE, 5V/div
B. 5V LDO OUTPUT, 2V/div
(SMPS UVLO RESPONSE)
POWER REMOVAL
10ms/div
CC
C. 5V SMPS, 2V/div
D. PGOOD1, 5V/div
and V
MAX17020 toc22
DD
Pin Description
.
A
B
C
D
resistor, and
13