MAX1533AETJ+ Maxim Integrated Products, MAX1533AETJ+ Datasheet - Page 15

• Manufacturer Part Number: MAX1533AETJ+
• Description: IC POWER SUPPLY CONTROLER 32TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1533AETJ+

• Applications: Power Supply Controller
• Voltage - Input: 4.5 ~ 26 V
• Current - Supply: 15µA
• 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
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

MAX1533A
High-Efficiency, 5x Output, Main Power-Supply
25
26
27
28
29
30
31
32
—
—
PIN
MAX1537A
27
28
29
30
31
32
33
34
35
36
______________________________________________________________________________________
Controllers for Notebook Computers
NAME
SHDN
LDOA
CSH5
CSL5
BST5
SKIP
DH5
LX5
INA
IN
Negative Current-Sense Input for 5V SMPS. Connect to the negative terminal of the
current-sense element. Figure 9 describes two different current-sensing options.
CSL5 also serves as the bootstrap input for LDO5.
Positive Current-Sense Input for 5V SMPS. Connect to the positive terminal of the
current-sense element. Figure 9 describes two different current-sensing options.
Input of the Startup Circuitry and the LDO5 Internal 5V Linear Regulator. Bypass to
PGND with 0.22µF close to the IC.
Inductor Connection for 5V SMPS. Connect LX5 to the switched side of the inductor.
LX5 serves as the lower supply rail for the DH5 high-side gate driver.
Boost Flying-Capacitor Connection for 5V SMPS. Connect to an external capacitor
and diode as shown in Figure 6. An optional resistor in series with BST5 allows the
DH5 pullup current to be adjusted.
High-Side Gate-Driver Output for 5V SMPS. DH5 swings from LX5 to BST5.
Pulse-Skipping Control Input. Connect to V
Connect to GND for high-efficiency pulse-skipping mode at light loads.
Shutdown Control Input. The device enters its 5µA supply-current shutdown mode if
V
V
automatic startup. SHDN can be connected to V
to implement a programmable undervoltage lockout.
Supply Voltage Input for the Auxiliary LDOA Linear Regulator. INA is clamped with an
internal shunt to 26V.
Adjustable (12V Nominal) 150mA Auxiliary Linear-Regulator Output. Input supply
comes from INA. Bypass LDOA to GND with 2.2µF (min) (1µF/20mA). Secondary
feedback threshold is set at INA - LDOA = 0.8V, and triggers the DL5 on the 5V
SMPS only. ONA high enables regulator output and secondary regulation. PGOOD is
not affected by the state of LDOA.
SHDN
SHDN
is less than the SHDN input falling-edge trip level and does not restart until
is greater than the SHDN input rising-edge trip level. Connect SHDN to V
Pin Description (continued)
FUNCTION
CC
for low-noise forced-PWM mode.
IN
through a resistive voltage-divider
IN
for
15