MAX773ESD+T Maxim Integrated Products, MAX773ESD+T Datasheet
MAX773ESD+T
Specifications of MAX773ESD+T
Related parts for MAX773ESD+T
MAX773ESD+T Summary of contents
Page 1
... EXT MAX771 ON/OFF SHDN CS REF V+ FB AGND GND ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Low I , Step-Up DC-DC Controllers Q ____________________________Features 90% Efficiency for 10mA to 1A Load Currents Up to 15W Output Power 110µ ...
Page 2
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q ABSOLUTE MAXIMUM RATINGS Supply Voltages V+ to GND.............................................................-0.3V to 17V V+ to SGND.............................................................-0. SGND........................................................-0.3V to (V+ + 0.3V) EXT, CS, REF, LBO, LBI, SHDN, FB.............-0.3V to (V+ ...
Page 3
Adjustable, High-Efficiency, ELECTRICAL CHARACTERISTICS (continued) ( 0mA LOAD A MIN PARAMETERS SYMBOL REF Load Regulation REF Line Regulation FB Trip-Point Voltage V FB Input Current I SHDN Input High ...
Page 4
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A MAX770 EFFICIENCY vs. OUTPUT CURRENT (BOOTSTRAPPED) 100 3. ...
Page 5
Adjustable, High-Efficiency, ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A REFERENCE OUTPUT RESISTANCE vs. TEMPERATURE 250 200 150 100 50 0 -60 -40 - TEMPERATURE ( C) MAXIMUM SWITCH ON-TIME vs. TEMPERATURE 16.5 ...
Page 6
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 2a +25°C, unless otherwise noted.) A MAX770 HEAVY-LOAD SWITCHNG WAVEFORMS V OUT 0 I LIM I LIM ...
Page 7
Adjustable, High-Efficiency, ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 2a +25°C, unless otherwise noted.) A ______________________________________________________________Pin Description PIN MAX770 NAME MAX771 MAX773 MAX772 1 — EXT Gate drive for external N-channel power transistor Power-supply input. Also ...
Page 8
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q _________________________________________________Pin Description (continued) PIN MAX770 NAME MAX771 MAX773 MAX772 Low-level gate/base drive for external power transistor. Connect to the gate of an external — 12 EXTL N-channel MOSFET or ...
Page 9
Adjustable, High-Efficiency, LBO V15 V12 V+ MAX773 ONLY LBI N 1.5V REF REFERENCE COMPARATOR ONE-SHOT Q TRIG F ONE-SHOT TRIG Q Figure 1. Block Diagram Floating the shunt-regulator ground (SGND) disables the shunt regulator. To ...
Page 10
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers 0 REF C3 L1 0.1 F MAX770 SHDN EXT MTP3055EL 8 6 AGND ...
Page 11
Adjustable, High-Efficiency V12 14 V15 SGND R4 8 63.4k REF MAX773 (1 LBO 0 LBI 13 EXTH EXTL SHDN 10k ...
Page 12
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers 24V TO 28V 250 H R SHUNT 0 SGND N EXTH 13 Si9420DY 4 LBO 12 ...
Page 13
Adjustable, High-Efficiency, drive outputs (EXTH and EXTL) that operate 180° out of phase (Figures 3a and 3b). In Figure 3b, the resistor in series with EXTH limits the base current, and EXTL (which is connected directly to the ...
Page 14
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q Table 1. Bootstrapped vs. Non-Bootstrapped Operation PARAMETER Gate Drive FET On Resistance Gate-Drive Capacitive Losses No-Load Supply Current Possible Input Voltage Range Normally Recommended Input Voltage Range Fixed Output ...
Page 15
Adjustable, High-Efficiency, 3 OUT 3 40m SENSE 2 50m SENSE 2.0 R SENSE 1.5 1.0 R SENSE 0.5 R SENSE INPUT VOLTAGE (V) Figure ...
Page 16
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q MAX770 MAX771 MAX772 EXT CS Figure 8a. Use an N-Channel MOSFET with the MAX770/MAX771/MAX772 MAX773 EXTH EXTL CS Figure 8b. Using an N-Channel MOSFET with the MAX773 The standard ...
Page 17
Adjustable, High-Efficiency, The two most significant losses contributing to the 2 N-FET’s power dissipation are I R losses and switching losses. Select a transistor with low minimize these losses. RSS Determine the maximum required gate-drive ...
Page 18
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q Smaller capacitors are acceptable for light loads or in applications that can tolerate higher output ripple. Since the output filter capacitor’s ESR affects efficien- cy, use low-ESR capacitors for ...
Page 19
Adjustable, High-Efficiency, Starting Up under Load The Typical Operating Characteristics show the Start- Up Voltage vs. Load Current graph for bootstrapped- mode operation. This graph depends on the type of power switch used. The MAX770–MAX773 are not designed ...
Page 20
Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q ___Ordering Information (continued) PART TEMP. RANGE MAX771CPA 0°C to +70°C MAX771CSA 0°C to +70°C MAX771C/D 0°C to +70°C MAX771EPA -40°C to +85°C MAX771ESA -40°C to +85°C MAX771MJA -55°C to ...