Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148 user manual

User manual for the device Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148

Device: Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148
Size: 0,16 MB
Date of adding : 2013-05-25 14:05:06
Number of pages: 16
Print the manual

Download

How to use this site?

Our goal is to provide you with a quick access to the content of the user manual for Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148. Using the online preview, you can quickly view the contents and go to the page where you will find the solution to your problem with Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148.

For your convenience

If looking through the Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148 user manual directly on this website is not convenient for you, there are two possible solutions:

  • Full Screen Viewing - to easily view the user manual (without downloading it to your computer), you can use full-screen viewing mode. To start viewing the user manualAnalog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148 on full screen, use the buttonFullscreen.
  • Downloading to your computer - You can also download the user manual Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148 to your computer and keep it in your files. However, if you do not want to take up too much of your disk space, you can always download it in the future from ManualsBase.
Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148 user manual
Advertisement
« Page 1 of 16 »
Advertisement
Print version

Many people prefer to read the documents not on the screen, but in the printed version. The option to print the manual has also been provided, and you can use it by clicking the link above - Print the manual. You do not have to print the entire manual Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148 but the selected pages only. paper.

Summaries

Below you will find previews of the content of the user manuals presented on the following pages to Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148. If you want to quickly view the content of pages found on the following pages of the manual, you can use them.

Abstracts of contents
Summary of the content on the page No. 1

High Efficiency Synchronous
a
Step-Down Switching Regulators
ADP1148, ADP1148-3.3, ADP1148-5
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Operation From 3.5 V to 18 V Input Voltage
Ultrahigh Efficiency > 95%
ADJUSTABLE
VERSION
PWR SIGNAL
Low Shutdown Current
V P-DRIVE N-DRIVE GND GND SENSE(+) V SENSE(–)
IN FB
Current Mode Operation for Excellent Line and Load
3 1 14 12 11 8 9
7
Transient Response
ADP1148
High Efficiency Maintained Over Wide Current Range
NON-OVERLAP
Logic Controlled Micropower Shutdown DRI

Summary of the content on the page No. 2

ADP1148, ADP1148-3.3, ADP1148-5–SPECIFICATIONS 1 (08C ≤ T ≤ +708C, V = 10 V, V = 0 V, unless otherwise noted. See Figure 17.) ELECTRICAL CHARACTERISTICS A IN SHUTDOWN 2 Parameter Symbol Conditions Min Typ Max Units FEEDBACK VOLTAGE ADP1148 Only V V = 9 V 1.21 1.25 1.29 V 10 IN FEEDBACK CURRENT ADP1148 Only I 0.2 1.0 μA 10 REGULATED OUTPUT VOLTAGE V V = 9 V OUT IN ADP1148-3.3 I = 700 mA 3.23 3.33 3.43 V LOAD ADP1148-5 I = 700 mA 4.9 5.05 5.2 V LOAD = +25°C, V = 7 V to 12 V, OUTPUT VOLTAGE LINE T

Summary of the content on the page No. 3

ADP1148, ADP1148-3.3, ADP1148-5 1 ELECTRICAL CHARACTERISTICS (–408C ≤ T ≤ +858C, V = 10 V, V = 0 V, unless otherwise noted. See Figure 17.) A IN SHUTDOWN 2 Parameter Symbol Conditions Min Typ Max Units FEEDBACK VOLTAGE ADP1148 Only V V = 9 V 1.20 1.25 1.30 V 10 IN REGULATED OUTPUT VOLTAGE V V = 9 V OUT IN ADP1148-3.3 I = 700 mA 3.17 3.33 3.4 V LOAD ADP1148-5 I = 700 mA 4.85 5.05 5.2 V LOAD 3 INPUT DC SUPPLY CURRENT I Q Normal Mode V = 4 V < V < 18 V 1.6 2.6 mA IN IN Sleep Mode (ADP1148-3) V = 4

Summary of the content on the page No. 4

ADP1148, ADP1148-3.3, ADP1148-5 PIN FUNCTION DESCRIPTIONS Pin # Mnemonic Function 1 P-Channel Drive High Current Gate Drive for Top P-Channel MOSFET. The voltage swing at Pin 4 is from V to IN ground. 2 NC No Connection. Input Voltage. 3V IN External Capacitor C from Pin 4 to Ground Sets the Operating Frequency. The frequency is also 4C T T /V . dependent on the ratio V OUT IN Internal Supply Voltage, Nominally 3.3 V. Must be decoupled to signal ground. Do not externally load 5 Int V CC this pin

Summary of the content on the page No. 5

Typical Performance Characteristics–ADP1148, ADP1148-3.3, ADP1148-5 200 1000 1000 V = V = 5V SENSE OUT L = 50mH 800 800 R = 0.02V SENSE 150 L = 25mH 600 R = 0.02V 600 SENSE 100 400 400 V = 12V IN 50 V = 7V L = 50mH IN 200 R = 0.05V SENSE V = 10V 200 IN 0 0 5 0 123 4 0 0 100 200 300 05 1 234 FREQUENCY – kHz MAXIMUM OUTPUT CURRENT – A (V –V ) VOLTAGE – V IN OUT Figure 3. Selecting R vs. Maxi- Figure 4. Operating Frequency vs. Figure 5. Selecting Minimum Output SENSE mum Output Current Timing Capac

Summary of the content on the page No. 6

ADP1148, ADP1148-3.3, ADP1148-5–Typical Performance Characteristics 1.8 80 30 1.6 08C 70 25 1.4 60 258C 1.2 20 50 708C Qn+Qp = 100nC 1.0 15 40 0.8 30 10 0.6 5V Qn+Qp = 50nC 20 0.4 5 3.3V 10 0.2 0 0.0 0 20 50 80 110 140 170 200 230 260 12 468 10 12 0.3 0.5 1.0 1.5 2.0 2.5 3.0 3.3 3.5 4.0 4.5 5.0 OPERATING FREQUENCY – kHz (V –V ) – V OUTPUT VOLTAGE – V IN OUT Figure 13. Gate Charge Supply Figure 14. Off Time vs. V Figure 12. Operating Frequency vs. OUT Current (V –V ) IN OUT 155 150 145 MAXIMUM TH

Summary of the content on the page No. 7

ADP1148, ADP1148-3.3, ADP1148-5 APPLICATIONS To prevent both the external MOSFETs from ever being turned The ADP1148 uses a current-mode, constant off-time structure on simultaneously, feedback is incorporated to sense the state of to switch a pair of external complementary N- and P-channel the driver output pins. MOSFETs. The operating frequency of the device is deter- Before the N drive output can go high, the P drive output must mined by the value of the external capacitor connected to the al

Summary of the content on the page No. 8

ADP1148, ADP1148-3.3, ADP1148-5 As the operating frequency is increased, the gate charge losses components are also available from Coiltronics which do not will cause reduced efficiency (see Efficiency section). The full increase the component height significantly. formula for operating frequency is given by: Power MOSFET f = ( 1 – V /V )/t OUT IN OFF Two external power MOSFETs must be selected for use with 4 the ADP1148, a P-channel MOSFET for the main switch, and where t = 1.3 × 10 × C × V /V

Summary of the content on the page No. 9

ADP1148, ADP1148-3.3, ADP1148-5 An additional 0.1 μF – 1 μF ceramic bypass capacitor is advised Although all dissipative elements in the circuit produce losses, on V Pin 3 parallel with C . The selection of C is driven three main sources usually account for most of the losses in IN IN OUT by the required effective series resistance (ESR). The ESR of ADP1148 circuits: C must be less than twice the value of R for proper 1) ADP1148 dc bias current, OUT SENSE operation of the ADP1148: 2) MOSFET gate

Summary of the content on the page No. 10

ADP1148, ADP1148-3.3, ADP1148-5 Design Example Output Crowbar As a design example, assume V = 12 V (nominal), V = 5 V, An added feature to using an N-channel MOSFET as the syn- IN OUT I = 2 A, and f = 200 kHz, R . C , and L can immedi- chronous switch is the ability to crowbar the output with the MAX SENSE T ately be calculated: same MOSFET. Pulling the timing cap C pin above 1.5 V T when the output voltage is greater than the desired regulated R = 100 mV/2 = 50 mΩ SENSE value will turn “on” t

Summary of the content on the page No. 11

ADP1148, ADP1148-3.3, ADP1148-5 Board Layout 4) Does the (+) plate of C connect to the source of the IN When laying out the printed circuit board, the following check P-channel MOSFET as closely as possible? This capacitor list should be used to ensure proper operation of the ADP1148. provides the ac current to the P-channel MOSFET. These items are also illustrated graphically in the layout diagram 5) Is the input decoupling capacitor (1 μF) connected closely of Figure 18. Check the following in

Summary of the content on the page No. 12

ADP1148, ADP1148-3.3, ADP1148-5 V IN 4V TO 18V C IN IRF7204 D1 100mF 10BQ040 20V IRF7403 1 14 P-DRIVE N-DRIVE 13 2 *L NC NC 1mF 50mH ADP1148-3.3 12 3 POWER GND V IN 4 11 C SIGNAL GND T C T 5 10 300pF INT V SHUTDOWN CC 10nF 6 9 C OUT I V TH FB C 220mF C 7 8 10V 3 2 3300pF SENSE(–) SENSE(+) AVX **R 1000pF SENSE R C 0.1V 1kV V OUT 3.3V/1A NC = NO CONNECT *COILTRONICS CTX50-2-MP **KRL SP-1/2-A1-0R100J Figure 19. ADP1148 Low Dropout, 3.3 V/1 A High Efficiency Regulator V IN 4V TO 9V C IN IRF7204 D

Summary of the content on the page No. 13

ADP1148, ADP1148-3.3, ADP1148-5 V IN 5.2V TO 14V C IN IRF7204 D1 100mF 10BQ040 20V IRF7403 14 1 N-DRIVE P-DRIVE 13 2 *L NC ADP1148 NC VN2222LL 1mF 50mH 12 3 0V: V = 3.3V OUT V POWER GND IN 5V: V = 5V OUT 4 11 C SIGNAL GND T C T 10 R1A R1B 5 390pF 100pF INT V SHUTDOWN 33kV 43kV CC 1% 1% C OUT 10nF 6 9 220mF I V TH FB 10V 3 2 C C R2 7 8 OS-CON 56kV 3300pF SENSE(–) SENSE(+) 1% **R R 1000pF SENSE C 0.05V V 1kV OUT 3.3V/2A OR 5V/2A NC = NO CONNECT *COILTRONICS CTX50-2-MP **KRL SL-1-C1-0R050J Figur

Summary of the content on the page No. 14

ADP1148, ADP1148-3.3, ADP1148-5 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Lead Plastic DIP (N-14) 0.795 (20.19) 0.725 (18.42) 14 8 0.280 (7.11) 0.240 (6.10) 17 0.325 (8.25) 0.195 (4.95) 0.300 (7.62) 0.060 (1.52) 0.115 (2.93) PIN 1 0.015 (0.38) 0.210 (5.33) MAX 0.130 0.160 (4.06) (3.30) MIN 0.115 (2.93) 0.015 (0.381) SEATING 0.022 (0.558) 0.100 0.070 (1.77) 0.008 (0.204) PLANE (2.54) 0.014 (0.356) 0.045 (1.15) BSC 14-Lead Plastic SO (SO-14) 0.3444 (8.75) 0.3367 (8.55) 14 8 0.1574

Summary of the content on the page No. 15

–15–

Summary of the content on the page No. 16

–16– PRINTED IN U.S.A. C2219a–2–12/97


Similar user manuals
# User manual Category Download
1 Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148-5 Clock 32
2 Analog Devices High Efficiency Synchronous Step-Down Switching Regulators ADP1148-3.3 Clock 24
3 Sony Dream Machine ICF-C255RC Clock 13
4 Sony Clock ICF-CD863V Clock 25
5 Philips 170P6 Clock 27
6 Philips AJ290 Clock 30
7 Philips AJ3500 Clock 15