MAX8595ZETA+-MAX8595ZETA+T-MAX8596ZETA+-MAX8596ZETA+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8595ZETA+ ,High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDsApplications ♦ TDFN 3mm x 3mm x 0.8mm Package with Exposed PaddleCell Phones and Smart PhonesOrderi ..
MAX8595ZETA+T ,High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDsfeatures an♦ Flexible Dimming Controlambient-temperature derating function to avoid over-Analogdriv ..
MAX8596XETA+ ,High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDsMAX8595X/MAX8596X19-3485; Rev 2; 7/06High-Efficiency, 36V Step-Up Converterswith T Derating Option ..
MAX8596XETA+T ,High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDsfeatures an♦ Flexible Dimming Controlambient-temperature derating function to avoid over-Analogdriv ..
MAX8596ZETA+ ,High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDsELECTRICAL CHARACTERISTICS(V = 3.0V, L = 22µH, C = 2.2µF, C = 0.1µF, C = 0.1µF, R = 13Ω , V = 1.5V, ..
MAX8596ZETA+T ,High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDsFeaturesThe MAX8595Z/MAX8596Z drive up to 8 white LEDs ♦ Up to 8 LEDs at 25mAwith constant current ..
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MAX8595ZETA+-MAX8595ZETA+T-MAX8596ZETA+-MAX8596ZETA+T
High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs
General Description
The MAX8595Z/MAX8596Z drive up to 8 white LEDs
with constant current and high efficiency to provide
LCD backlighting in cell phones, PDAs, and other
handheld devices. The series connection allows the
LED currents to be identical for uniform brightness and
minimizes the number of traces to the LEDs. The
MAX8595Z regulates constant LED current over the
entire temperature range. The MAX8596Z features an
ambient-temperature derating function to avoid over-
driving the white LEDs during high ambient tempera-
tures, enabling higher drive current below +42°C.
A single Dual Mode™ input provides a simple means of
brightness adjustment and on/off control. Fast 1MHz
current-mode PWM operation allows for small input and
output capacitors and a small inductor while minimizing
ripple on the input supply/battery. Soft-start eliminates
inrush current during startup.
The MAX8595Z/MAX8596Z are available in a space-
saving, 8-pin 3mm x 3mm TDFN package.
Applications
Cell Phones and Smart Phones
PDAs, Palmtops, and Wireless Handhelds
e-Books and Subnotebooks
White LED Display Backlighting
FeaturesUp to 8 LEDs at 25mATemperature Derating Function to Allow Fewer
LEDs for Same Light (MAX8596Z)86% Efficiency (PLEDs / PIN)1.7% Current-Regulation AccuracyOutput Overvoltage ProtectionFlexible Dimming Control
Analog
Direct-PWM Internal Filter1MHz PWM Switching Frequency0.1µF Output Capacitor12mVP-PLow Input Ripple Soft-Start Eliminates Inrush Current2.6V to 5.5V Input Range0.3µA Shutdown CurrentPin Compatible with the MAX1561 and MAX1599TDFN 3mm x 3mm x 0.8mm Package with
Exposed Paddle
MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with TADerating Option for 2 to 8 White LEDs
GND
COMP2
PGND
CTRL
OUT
TOP VIEW4
MAX8595Z
MAX8596Z765
TDFN3mm x 3mm x 0.8mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configuration
Ordering Information
MAX8595Z
MAX8596ZLX
OUT
PGND
CTRL
COMP
GND
0.1μF
2 TO 9 LEDs
200Hz TO 200kHz
ANALOG OR
PWM DIMMING
2.2μF
INPUT
2.6V TO 5.5V
OUTPUT
UP TO 34V
Typical Operating Circuit
19-3358; Rev 1; 8/05
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-PACKAGEPKG
CODE
MAX8595ZETA-T-40°C to +85°C8 TDFN 3mm x 3mmT833-1
MAX8595ZETA+T-40°C to +85°C8 TDFN 3mm x 3mmT833-1
MAX8596ZETA-T-40°C to +85°C8 TDFN 3mm x 3mmT833-1
MAX8596ZETA+T-40°C to +85°C8 TDFN 3mm x 3mmT833-1
Dual Mode is a trademark of Maxim Integrated Products, Inc.
+Denotes lead-free package.
MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with TADerating Option for 2 to 8 White LEDs
ABSOLUTE MAXIMUM RATINGS
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.
IN to GND.................................................................-0.3V to +6V
PGND to GND.......................................................-0.3V to +0.3V
LX, OUT to GND.....................................................-0.3V to +37V
CTRL to GND...................-0.3V to the lower of +6V or (VIN+ 2V)
COMP, CS to GND......................................-0.3V to (VIN+ 0.3V)
ILX...................................................................................1.0ARMS
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN 3mm x 3mm
(derate 24.4mW/°C above +70°C)............................1950mW
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
ELECTRICAL CHARACTERISTICS
(VIN= 3.0V, L = 22µH, CIN= 2.2µF, COUT= 0.1µF, CCOMP= 0.1µF, RSENSE= 13Ω, VCTRL= 1.5V, TA= -40°C to +85°C, unless other-
wise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Supply Voltage2.65.5V
UVLO ThresholdVIN rising or falling2.102.382.55V
UVLO Hysteresis30mV
Quiescent CurrentNo switching0.50.7mA
TA = +25°C0.32Shutdown Supply CurrentCTRL = GND,
VOUT = VINTA = +85°C1µA
OVLO ThresholdVOUT rising323436V
OVLO Hysteresis2V
VOUT = 32V, VCTRL > 0.24V92035
TA = +25°C0.011OUT Input Bias CurrentOUT = IN, CTRL = GNDTA = +85°C0.1
Output Voltage Range(Note 2)VIN -32V
ERROR AMPLIFIER
TA = +25°C0.2950.3000.305
TA = 0°C to +85°C0.2920.3000.308CTRL to CS RegulationVCTRL = 1.50V,
VIN = 2.6V to 5.5V
TA = -40°C to +85°C0.2900.3000.310
TA = +25°C0.011CS Input Bias CurrentVCS = VCTRL / 5TA = +85°C0.03µA
MAX8595Z, VCTRL = 3.0V310330347
TA = -40°C to +25°C330345360
TA = +42°C343
CS Maximum Brightness Clamp
VoltageMAX8596Z,
VCTRL = 3.0V
TA = +85°C106.5
MAX8595Z1.65CTRL Voltage for CS Maximum
Brightness ClampMAX8596Z1.72V
CS Derating Function Start
TemperatureMAX8596Z, VCTRL = 3.0V+42°C
MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with TADerating Option for 2 to 8 White LEDs
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 3.0V, L = 22µH, CIN= 2.2µF, COUT= 0.1µF, CCOMP= 0.1µF, RSENSE= 13Ω, VCTRL= 1.5V, TA= -40°C to +85°C, unless other-
wise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
CS Derating Function SlopeMAX8596Z, VCTRL = 3.0V, TA = +42°C to +85°C-5.5mV/°C
CTRL Input ResistanceVCTRL < 1.5V250500780kΩ
CTRL Dual-Mode Threshold100170240mV
CTRL Dual-Mode Hysteresis5mV
CTRL Shutdown Enable Delay(Note 3)6.08.210.5ms
CS to COMP TransconductanceVCOMP = 1.5V325082µS
COMP Input Resistance to
GroundIn shutdown, UVLO or OVLO20kΩ
OSCILLATOR
Operating Frequency0.751.01.25MHz
PWM mode12Minimum Duty CyclePulse skipping0%
Maximum Duty CycleCTRL = IN, CS = GND9495%
N-CHANNEL SWITCH
LX On-ResistanceILX = 190mA0.81.35Ω
TA = +25°C0.015LX Leakage CurrentVLX = 36V, CTRL = GNDTA = +85°C1µA
LX Current LimitDuty cycle = 90%500700900mA
Note 1:Parameters are 100% production tested at TA= +25°C. Limits over the operating temperature range are regulated by
design and characterization.
Note 2:VDis the forward-voltage drop of the Schottky diode in Figure 1.
Note 3:Time from CTRL going below the Dual-Mode threshold to IC shutdown.
MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with TADerating Option for 2 to 8 White LEDs
Typical Operating Characteristics
(Circuit of Figure 1, VIN= 3.6V, ILED= 25mA, L = 22µH, CIN= 2.2µF, COUT= 0.1µF, CCOMP= 0.1µF, RSENSE= 13Ω, 4 LEDs, = +25°C, unless otherwise noted.)
EFFICIENCY
vs. INPUT VOLTAGE
MAX8595Z toc01
INPUT VOLTAGE (V)
EFFICIENCY (%)43
3 LEDs
4 LEDs
6 LEDs
8 LEDs
EFFICIENCY
vs. LED CURRENT
MAX8595Z toc02
LED CURRENT (mA)
EFFICIENCY (%)2015105
3 LEDs
6 LEDs
8 LEDs
LED CURRENT
vs. DIRECT-PWM DIMMING
MAX8595Z toc03
DUTY CYCLE (%)
LED CURRENT (mA)604020100
LED CURRENT
vs. AMBIENT TEMPERATURE
MAX8595Z toc04
TEMPERATURE (°C)
LED CURRENT (mA)6020400-20
MAX8596,
ILED = 25mA AT TA = +25°C
MAX8595,
ILED = 15mA
SWITCHING WAVEFORMS
MAX8595Z toc05
500ns/div
VIN20mV/div
AC-COUPLED
200mV/div
AC-COUPLED
100mA/div
10V/divVLX
VOUT
SOFT-START AND SHUTDOWN RESPONSE
MAX8595Z toc06
20ms/div
VCTRL2V/div
40mA/div
10V/div
100mA/divIIN
ILED
VOUT
MAX8595Z/MAX8596Z
High-Efficiency, 32V Step-Up Converters
with TADerating Option for 2 to 8 White LEDsypical Operating Characteristics (continued)
(Circuit of Figure 1, VIN= 3.6V, ILED= 25mA, L = 22µH, CIN= 2.2µF, COUT= 0.1µF, CCOMP= 0.1µF, RSENSE= 13Ω, 4 LEDs, = +25°C, unless otherwise noted.)
Pin Description
PINNAMEFUNCTIONOUT
Overvoltage Sense. When VOUT is greater than 34V (typ), the internal n-channel MOSFET turns off
until VOUT drops below 32V (typ), then the IC re-enters soft-start. Connect a 0.1µF ceramic capacitor
from OUT to ground. In shutdown, VOUT is one diode drop below VIN.
2INInput Voltage Supply. The input voltage range is 2.6V to 5.5V. Connect a 2.2µF ceramic capacitor
from IN to GND.CTRL
Brightness Control Input. The voltage applied to CTRL controls LED brightness. Varying the voltage
from 0.24V to 1.65V (1.72V for the MAX8596Z) adjusts the brightness from dim to 100% brightness,
respectively. Any voltage above 1.65V (1.72V) does not increase brightness. Hold CTRL below
100mV to shut down the IC after an 8.2ms delay.
4CSCurrent-Sense Feedback Input. Connect a resistor from CS to GND to set the LED bias current. The
voltage at CS regulates to VCTRL / 5 or 0.330V (0.343V for the MAX8596Z), whichever is lower.COMP
Compensation Input. Connect a 0.1µF ceramic capacitor (CCOMP) from COMP to GND. CCOMP
stabilizes the converter, controls soft-start, and lowpass filters direct PWM dimming at CTRL. CCOMP
discharges to 0V through an internal 20kΩ resistor in shutdown.GNDGround. Connect to PGND and the exposed pad directly under the IC.PGNDPower Ground. Connect to GND and the exposed pad directly under the IC.
8LXInductor Connection. Connect LX to the node between the inductor and the Schottky diode. LX is
high impedance in shutdown.
—EPExposed Pad. Connect to a large ground plane for maximum package heat dissipation. Connect
directly to GND and PGND under the IC.
DIRECT-PWM DIMMING RESPONSE
MAX8595Z toc08
10μs/div
VCTRL2V/div
32kHz 50%
DUTY CYCLE
500mV/div
AC-COUPLED
10mA/div
20mV/div
AC-COUPLEDVIN
VOUT
ILED
CTRL STEP RESPONSE
MAX8595Z toc07
20ms/div
VCTRL1V/div
40mA/div
10V/div
100mA/divIIN
ILED
VOUT
MAX8595Z/MAX8596Z
Detailed Description
The high efficiency and small size of the MAX8595Z/
MAX8596Z make them ideally suited to drive up to 9
series-connected LEDs. These devices operate as a
boost DC-DC converter that regulates output current
rather than voltage. The MAX8595Z/MAX8596Z provide
even illumination by sourcing the same output current
through each LED, eliminating the need for expensive
factory calibration. The fast 1MHz internal oscillator
allows for a small inductor and small input and output
capacitors while minimizing input and output ripple.
The single analog control input (CTRL) allows easy
adjustment of LED brightness and on/off control. This
allows simple logic-level on/off control, analog voltage
control, or PWM duty-cycle control of both brightness
and shutdown. In shutdown, supply current is reduced
to a low 0.3µA (typ). A soft-start gradually illuminates
the LEDs, eliminating the inrush current during startup.
The MAX8596Z has the additional feature of derating
LED current as ambient temperature rises. Above
+42°C, the CS regulation voltage is reduced at a rate of
5.5mV/°C, thus reducing the LED current.
Soft-Start
The MAX8595Z/MAX8596Z attain soft-start by charging
CCOMPgradually with a current source. When VCOMP
rises above 1.25V, the internal MOSFET begins switch-
ing at a reduced duty cycle. When VCOMPrises above
2.25V, the duty cycle is at its maximum. See the
Typical Operating Characteristics for an example of
soft-start operation.
Shutdown
The MAX8595Z/MAX8596Z enter shutdown when VCTRL
is less than 100mV for more than 8.2ms. In shutdown,
supply current is reduced to 0.3µA (typ) by powering
down the entire IC except for the CTRL voltage-detec-
tion circuitry. CCOMPis discharged during shutdown,
allowing the device to re-initiate soft-start when it is
enabled. Although the internal n-channel MOSFET does
not switch in shutdown, there is still a DC current path
between the input and the LEDs through the inductor
and Schottky diode. The minimum forward voltage of the
LED array must exceed the maximum input voltage to
ensure that the LEDs remain off in shutdown. However,
with 2 or more LEDs, the forward voltage is large
enough to keep leakage current low, less than 1µA
(typ). Typical shutdown timing characteristics are shown
in the Typical Operating Characteristics.
Overvoltage Protection
Overvoltage lockout (OVLO) occurs when VOUTis
above 34V (typ). The protection circuitry stops the inter-
nal MOSFET from switching and causes VCOMPto
decay towards 0V. The device comes out of OVLO and
into soft-start when VOUTfalls below 32V (typ).
Ambient Temperature Derating Function
(MAX8596Z)
The MAX8596Z limits the maximum LED current
depending on the die temperature. VCSis limited to
343mV up to +42°C. Once the temperature reaches
+42°C, the maximum VCS declines by 5.5mV/°C until
the minimum 106.5mV threshold is reached at +85°C.
Due to the package’s exposed paddle, the die temper-
ature is always very close to the PC board temperature.
The temperature derating function allows the LED cur-
rent to be safely set higher at normal operating temper-
atures, thereby allowing either a brighter display or
fewer LEDs to be used for normal display brightness.
See the Typical Operating Characteristicsfor LED
Current vs. Ambient Temperature.
High-Efficiency, 32V Step-Up Converters
with TADerating Option for 2 to 8 White LEDs
0.1μF
PWM
CONTROL
2.2μF
22μH
PGND
OVER-
VOLTAGE
PROTECT
SHUTDOWN8.2ms
GND
COMP
CTRL
170mV
100kΩ121kΩ279kΩ
1.25V CLAMP OR
TEMP DERATE CLAMP
RSENSE
13Ω
2.6V TO 5.5V
fOSC
1MHz
0.1μF
ANALOG
OR DIRECT
PWM
DIMMING
OUT
Figure 1. Functional Diagram and Typical Application Circuit

Partno	Mfg	Dc	Qty	Available	Descript
MAX8595ZETA+	MAXIM	N/a	2600	avai	High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs
MAX8595ZETA+T \|MAX8595ZETAT	MAXIM	N/a	740	avai	High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs
MAX8596ZETA+ \|MAX8596ZETA	MAXIM	N/a	115	avai	High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs
MAX8596ZETA+T	MAXIM	N/a	31	avai	High-Efficiency, 32V Step-Up Converters with TA Derating Option for 2 to 8 White LEDs