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MAX8599ETE+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
General Description
The MAX8597/MAX8598/MAX8599 voltage-mode PWM
step-down controllers are designed to operate from a
4.5V to 28V input supply and generate output voltages
down to 0.6V. A proprietary switching algorithm stretch-
es the duty cycle to >99.5% for low-dropout design.
Unlike conventional step-down regulators using a p-
channel high-side MOSFET to achieve high duty cycle,
the MAX8597/MAX8598/MAX8599 drive n-channel
MOSFETs resulting in high efficiency and high-current-
capability designs.
The MAX8597 is available in a 20-pin thin QFN pack-
age and is designed for applications that use an analog
signal to control the output voltage with an adjustable
offset, such as DC fan-speed control. This is achieved
with an internal uncommitted operational amplifier. The
MAX8597 is also targeted for tracking output-voltage
applications for chipsets, ASIC and DSP cores, and I/O
supplies. The MAX8598/MAX8599 are available in a 16-
pin thin QFN package and do not have the uncommitted
operational amplifier, reference input, and reference out-
put, but offer an open-drain, power-OK output.
The MAX8597/MAX8598/MAX8599 allow startup with
prebias voltage on the output for applications where a
backup supply or a tracking device may charge the
output capacitor before the MAX8597/MAX8598/
MAX8599 are enabled. In addition, the MAX8599 fea-
tures output overvoltage protection.
These controllers also feature lossless high-side peak
inductor current sensing, adjustable current limit, and
hiccup-mode short-circuit protection. Switching fre-
quency is set with an external resistor from 200kHz to
1.4MHz. This wide frequency range combined with a
wide-bandwidth error amplifier enables the loop com-
pensation scheme to give the user ample flexibility to
optimize for cost, size, and efficiency.
Applications
Nonisolated Power Modules
Variable-Speed DC Fan Power Supplies
(MAX8597)
Tracking Power Supplies (MAX8597)
Chipset Power Supplies
Features
♦ Low Dropout with >99.5% Duty Cycle
♦ Lossless High-Side Current Limit
♦ Wide 4.5V to 28V Input Range
♦ Dynamic Output Voltage Adjustment with
Adjustable Offset (MAX8597)
♦ Remote Voltage Sensing for Both Positive and
Negative Rails (MAX8597)
♦ Tracking Output Through REFIN (MAX8597)
♦ Adjustable Switching Frequency from 200kHz to
1.4MHz
♦ Adjustable Soft-Start
♦ Prebias Startup
♦ Enable and Power-OK (MAX8598/MAX8599) for
Flexible Sequencing
♦ 25MHz Error Amplifier
♦ Adjustable Hiccup Current Limit for Output
Short-Circuit Protection
♦ Output Overvoltage Protection (MAX8599)
♦ Small, Low-Profile Thin QFN Package
MAX8597/MAX8598/MAX8599
Low-Dropout, Wide-Input-Voltage,
Step-Down Controllers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3505; Rev 1; 6/05
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX8597ETP -40°C to +85°C
20 Thin QFN 4mm x 4mm
(T2044-3)
MAX8597ETP+ -40°C to +85°C
20 Thin QFN 4mm x 4mm
(T2044-3)
MAX8598ETE -40°C to +85°C
16 Thin QFN 4mm x 4mm
(T1644-4)
MAX8598ETE+ -40°C to +85°C
16 Thin QFN 4mm x 4mm
(T1644-4)
MAX8599ETE -40°C to +85°C
16 Thin QFN 4mm x 4mm
(T1644-4)
MAX8599ETE+ -40°C to +85°C
16 Thin QFN 4mm x 4mm
(T1644-4)
+Denotes lead-free package.
Pin Configurations appear at end of data sheet.
MAX8597/MAX8598/MAX8599
Low-Dropout, Wide-Input-Voltage,
Step-Down Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
V+
= V
VL
= V
AVL
= V
EN
= V
REFIN
= 5V, V
BST
= 6V, V
LX
= 1V, C
VL
= 4.7µF, C
REFOUT
= 1µF, V
AIN-
= V
AOUT
, V
AIN+
= 2.5V, V
ILIM
=
V
LX
- 0.2V, V
FB
= 0.65V, GND = PGND = 0V, C
SS
= 0.01µF, R
FREQ
= 20kΩ, T
A
= 0°C to +85°C, typical values are at T
A
= +25°C,
unless otherwise noted.)
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.
V+, ILIM to GND .....................................................-0.3V to +30V
AVL, VL to GND........................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
FB, EN, POK, AIN-, AIN+, REFIN to GND ................-0.3V to +6V
AOUT, REFOUT, FREQ, SS, COMP to
GND .....................................................-0.3V to (V
AVL
+ 0.3V)
BST to GND ............................................................-0.3V to +36V
DH to LX....................................................-0.3V to (V
BST
+ 0.3V)
LX to GND ........................-2V (-2.5V for less than 50ns) to +30V
LX to BST..................................................................-6V to +0.3V
DL to PGND.................................................-0.3V to (V
VL
+ 0.3V)
Continuous Power Dissipation
16- or 20-Pin Thin QFN
Up to +70°C (derate 16.9mW/°C above +70°C)........1349mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
GENERAL
V+ Operating Range 5.5 28.0 V
V+/VL Operating Range V+ = VL 4.5 5.5 V
V+ Operating Supply Current V
V+
= 12V, VL unloaded, no MOSFETs connected, V
FB
= 0V 3.4 5.0 mA
V+ Standby Supply Current V
V+
= 12V, VL unloaded, V
FB
= 0V 2.0 mA
VL REGULATOR
Output Voltage 5.5V < V
V+
< 28V, 1mA < I
LOAD
< 35mA 4.7 5.0 5.3 V
VL Undervoltage-Lockout
Trip Level
Rising edge, typical hysteresis = 460mV 4.05 4.2 4.35 V
Thermal Shutdown Rising temperature, typical hysteresis = 10°C +160 °C
REFERENCE (MAX8597 only)
REFOUT Output Voltage I
REFOUT
= 150µA, V
V+
= V
VL
= 4.5V or 5.5V 2.49 2.50 2.51 V
REFOUT Load Regulation I
REFOUT
= 10µA to 1mA 10 mV
REFOUT Internal Discharge
Switch On-Resistance
During VL UVLO 15 Ω
CURRENT-LIMIT COMPARATOR (all current limits are tested at V
V+
= V
VL
= 4.5V and 5.5V)
ILIM Sink Current 1.8V < V
LX
< 28V, V
BST
= V
LX
+ 5V 180 200 220 µA
Comparator Input Offset
Voltage Error
V
LX
= 28V, V
BST
= V
LX
+ 5V -10 +10 mV
SOFT-START
Soft-Start Source Current V
SS
= 100mV 3 5 7 µA
Soft-Start Sink Current V
SS
= (0.6V or V
REFIN
) 3 5 7 µA
FREQUENCY
R
FREQ
= 100kΩ 150 200 240
R
FREQ
= 20.0kΩ 800 1000 1200Frequency
R
FREQ
= 14.3kΩ 1100 1400 1700
kHz
MAX8597/MAX8598/MAX8599
Low-Dropout, Wide-Input-Voltage,
Step-Down Controllers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
V+
= V
VL
= V
AVL
= V
EN
= V
REFIN
= 5V, V
BST
= 6V, V
LX
= 1V, C
VL
= 4.7µF, C
REFOUT
= 1µF, V
AIN-
= V
AOUT
, V
AIN+
= 2.5V, V
ILIM
=
V
LX
- 0.2V, V
FB
= 0.65V, GND = PGND = 0V, C
SS
= 0.01µF, R
FREQ
= 20kΩ, T
A
= 0°C to +85°C, typical values are at T
A
= +25°C,
unless otherwise noted.)
PARAMETER CONDITIONS MIN TYP MAX UNITS
DH Minimum Off-Time 180 200 220 ns
DH Minimum On-Time 115 140 ns
FB ERROR AMPLIFIER
FB Input Bias Current 100 nA
FB Input Voltage Set Point Over load and line 0.594 0.600 0.606 V
FB Offset Error V
REFIN
= 1.25V and 2.5V, measured with respect to REFIN +10 -10 mV
Error-Amp Open-Loop Voltage
Gain
V
COMP
= 1.2V to 2.4V 72 90 dB
Slew Rate C
LOAD
= 80pF 18 V/µs
UNCOMMITTED OPERATIONAL AMPLIFIER (MAX8597 only)
R
LOAD
= 100kΩ 90
Open-Loop Voltage Gain (A
VOL
)
R
LOAD
= 10kΩ 70
dB
Output-Voltage Swing High V
AIN+
= 2.5V, V
AIN
- = (V
AIN+
- 100mV), I
SOURCE
= 100µA
V
AVL
-
20mV
V
Output-Voltage Swing Low V
AIN+
= 2.5V, V
AIN
- = (V
AIN+
+ 100mV), I
SINK
= 100µA 20 mV
Unity-Gain BW 1.5 MHz
C
LOAD
= 10pF, R
LOAD
= 10kΩ to 100kΩ +80
Phase Margin
C
LOAD
= 100pF, R
LOAD
= 10kΩ to 100kΩ +40
D egr ees
Slew Rate C
LOAD
= 100pF 3.5 V/µs
Input Offset Voltage V
CM
= 1.25V and 2.5V -3 +3 mV
Input Leakage Current -10 +10 nA
Input Common-Mode Range
(CMVR)
+0.50
V
AVL
-
2.0
V
Common-Mode Rejection Ratio
(CMRR)
75 dB
DRIVERS
DH, DL Break-Before-Make Time C
LOAD
= 2000pF 20 ns
DH On-Resistance in Low State V
BST
- V
LX
= 5V 1.0 2.5 Ω
DH On-Resistance in High State V
BST
- V
LX
= 5V 1.5 3.3 Ω
DL On-Resistance in Low State V
VL
= V
V+
= 5V 0.45 1.0 Ω
DL On-Resistance in High State V
VL
= V
V+
= 5V 1.3 2.5 Ω
BST Bias Current V
BST
= 33V, V
LX
= 28V, V
EN
= 0V 230 520 µA
LX Bias Current V
BST
= 33V, V
LX
= 28V, V
EN
= 0V -230 -520 µA
BST/LX Leakage Current V
BST
= V
LX
= 28V, V
EN
= 0V 50 µA
LOGIC INPUTS (EN)
Input Low Level 4.5V < V
VL
= V
V+
= V
AVL
< 5.5V 1.14 0.80 V
Input High Level 4.5V < V
VL
= V
V+
= V
AVL
< 5.5V 2.40 1.73 V
Input Bias Current V
VL
= V
V+
= V
AVL
= 5.5V, V
EN
= 0 to 5.5V -1 +1 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

MAX8599ETE+T

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Buy MAX8599ETE+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers Step-Down Controller
Lifecycle:
New from this manufacturer.
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