MAX8737 Controllers Datasheet

MAX8737 Datasheet PDF, Equivalent


Part Number

MAX8737

Description

Low-Voltage Linear Regulator Controllers

Manufacture

Maxim Integrated Products

Total Page 15 Pages
PDF Download
Download MAX8737 Datasheet PDF


MAX8737
www.DataSheet4U.com
19-3705; Rev 0; 5/05
EVAALVUAAILTAIOBNLEKIT
Dual, Low-Voltage Linear Regulator Controllers
with External MOSFETs
General Description
The MAX8737 dual high-power linear regulator con-
trollers use external n-channel MOSFETs to generate
two independent low-voltage supplies for notebook
computers. The MAX8737 delivers low output voltages
from 0.5V to 2.5V (±5mV no-load accuracy). The exter-
nal components allow scalable current design with
loads up to 5A with excellent load regulation (1%). The
regulator operates from a low input voltage, which also
reduces the power dissipation in the external n-channel
MOSFET. The controller powers the external MOSFET
gate driver from the standard 5V system supply.
The MAX8737 includes current and thermal limits to
prevent damage to the linear regulator. The MAX8737
uses an external resistive divider to fold back the cur-
rent limit, reducing the overall power dissipation. The
MAX8737 uses an external resistive-divider in series
with the current-sense input (CS_), providing foldback
current-limit protection, and effectively reducing the
short-circuit power dissipation.
An output undervoltage timeout is available for low-cost
applications that omit the current-sense resistor. The
output undervoltage (UVP) timing depends on the mag-
nitude of the voltage at VOUT. The UVP detects and
shuts down the LDO if the output voltage drops out of
regulation. The controller uses an adjustable reference
input (REFIN_) to set the nominal output voltage
(VOUT_), which minimizes the cost and makes the sta-
bility independent of the output voltage.
Each linear regulator features an adjustable soft-start
function, and generates a delayed power-good
(PGOOD) signal that signals when the linear regulator
is in regulation. The MAX8737 is a low-cost solution
requiring few external components and is available in a
small, 4mm x 4mm, 16-pin thin QFN package.
Applications
Notebook and Desktop Computers
Point-of-Load Regulators
VMCH and VCCP CPU Supplies
Low-Voltage Bias Supplies
Servers
Features
Low-Cost Dual Linear Regulators
Output Voltage Accuracy ±5mV
Independent 0.5V to 2.5V Reference Inputs
Foldback Current-Limit Protection
Output Undervoltage-Lockout Protection
Thermal Limit (Internal Sensor)
1.0V to 5.5V Input Supply Voltage (External FET
Drain)
5V Bias Supply Voltage
Independent Power-Good Open-Drain Outputs
Independent Enable Inputs
Soft-Shutdown Output Discharge
Low Supply Current (0.5mA)
5µA (max) Shutdown Supply Current
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8737ETE -40°C to +85°C 16 Thin QFN-EP* 4mm x 4mm
MAX8737ETE+ -40°C to +85°C 16 Thin QFN-EP* 4mm x 4mm
*EP = Exposed pad.
+Denotes lead-free packaging.
Pin Configuration
TOP VIEW
DRV2 13
N.C. 14
GND 15
DRV1 16
12 11 10 9
MAX8737
1 23 4
8 EN1
7 EN2
6 PGOOD1
5 PGOOD2
4mm x 4mm TQFN
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX8737
Dual, Low-Voltage Linear Regulator Controllers
with External MOSFETs
ABSOLUTE MAXIMUM RATINGS
VCC to GND ..............................................................-0.3V to +6V
OUT1, OUT2 to GND................................................-0.3V to +6V
REFIN1, REFIN2, PGOOD1, PGOOD2, EN1,
EN2 to GND..........................................................-0.3V to +6V
DRV1, DRV2, CS1, CS2 to GND.................-0.3V to (VCC + 0.3V)
Continuous Power Dissipation (TA = +70°C)
16-Pin 4mm x 4mm Thin QFN (derated 25mW/°C
above +70°C).............................................................2000mW
Operating Temperature Range
MAX8737ETE ...................................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VCC = 5V, EN_ = CS_ = VCC, VREFIN = 1.0V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
Supply Voltage Range
VCC Undervoltage Lockout
Threshold
VCC Quiescent Supply Current
VCC Shutdown Supply Current
REFIN to OUT Offset Voltage
OUT_ Input Bias Current
DRIVERS
DRV_ Output Voltage Swing
(Note 1)
DRV_ Maximum Sourcing Current
DRV_ Maximum Sinking Current
OUT_ to DRV_ Transconductance
(Large Signal)
SYMBOL
VCC
CONDITIONS
Rising edge, 200mV hysteresis (typ)
ICC
VOUT_
IOUT_
EN1 = EN2 = VCC
EN1 = EN2 = GND
Output high; VOUT_ = VREFIN_ - 25mV,
ILOAD = 1mA
Output low; VOUT_ = VREFIN_ + 25mV,
ILOAD = 1mA
VOUT_ = VREFIN_ - 25mV; VDRV = 3V
VOUT_ = VREFIN_ + 25mV; VDRV = 3V
GMDRV
MIN TYP MAX UNITS
4.75 5.50 V
4.1 4.35 4.6
V
0.5 1 mA
0.1 5
µA
-5 +5 mV
-1 +1 µA
VCC -
0.3
VCC -
0.05
0.03
6 14
6 14
0.8
0.3
V
mA
mA
S
DRV_ Power-Supply Rejection
Ratio
DRV_ Soft-Start Charging Current
REFERENCE INPUT
REFIN_ Voltage Range
REFIN_ Input Bias Current
FAULT PROTECTION
Thermal Shutdown Threshold
Current-Limit Threshold
CS_ Input Current
Linear Regulator UVP Threshold
(Slow)
ISOFT
10Hz < f < 10kHz, IDRV = 1mA, CDRV =
10nF
VREFIN_ VCC = 4.75V to 5.5V
IREFIN_ VREFIN_ = 0 to 2.5V
TSHDN
VILIM
Hysteresis = 20°C
VCS_ - VOUT_
TA = 0°C to +85°C
TA = +85°C
UVP(SLOW) With respect to VREFIN; CS_ = VCC
-80 dB
40 170 400 µA
0.5
-100
2.5
-10 +100
V
nA
+125
7 10 13
7.5 10 12.5
-1 +1
72 80 88
°C
mV
µA
%
2 _______________________________________________________________________________________


Features www.DataSheet4U.com 19-3705; Rev 0; 5/0 5 KIT ATION EVALU E L B AVAILA Dual, Low-Voltage Linear Regulator Controller s with External MOSFETs General Descrip tion The MAX8737 dual high-power linear regulator controllers use external n-c hannel MOSFETs to generate two independ ent low-voltage supplies for notebook c omputers. The MAX8737 delivers low outp ut voltages from 0.5V to 2.5V (±5mV no -load accuracy). The external component s allow scalable current design with lo ads up to 5A with excellent load regula tion (1%). The regulator operates from a low input voltage, which also reduces the power dissipation in the external n-channel MOSFET. The controller powers the external MOSFET gate driver from t he standard 5V system supply. The MAX87 37 includes current and thermal limits to prevent damage to the linear regulat or. The MAX8737 uses an external resist ive divider to fold back the current li mit, reducing the overall power dissipa tion. The MAX8737 uses an external resistive-divider in series w.
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