Datasheet

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120 mA Switched Capacitor

Voltage Inverter with Regulated Output

Data Sheet

ADP3605

Rev. B Document Feedback

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FEATURES

Fully regulated adjustable output voltage

High output current: 120 mA

Output accuracy: ±3%

250 kHz switching frequency

Low shutdown current: 2 µA typical

Input voltage range: 3 V to 6 V

8-Lead SOIC package

−40°C to +85°C ambient temperature range

APPLICATIONS

Voltage inverters

Voltage regulators

Computer peripherals and add-on cards

Portable instruments

Battery powered devices

Pagers and radio control receivers

Disk drives

Mobile phones

FUNCTIONAL BLOCK DIAGRAM

Figure 1.

GENERAL DESCRIPTION

The ADP3605 is a 120 mA regulated output, switched capacitor

voltage inverter. It provides a regulated output voltage with

minimum voltage loss and requires a minimum number of

external components. In addition, the ADP3605 does not

require the use of an inductor.

Pin-for-pin and functionally compatible with the ADP3604, the

internal oscillator of the ADP3605 runs at a 500 kHz nominal

frequency that produces an output switching frequency of

250 kHz. This allows for the use of smaller charge pump and

filter capacitors.

The ADP3605 provides an accuracy of ±3% with a typical

shutdown current of 2 µA. It can also operate from a single

positive input voltage as low as 3 V. The ADP3605 is adjustable

via external resistors over a −3 V to −6 V range.

Figure 2. Typical Application Circuit

S P D

S1 S3

S2 S4

S N D D N S

D N S

OSC

CLOCK

GEN

OUT

SENSE

GND

ADP3605

–

FEEDBACK

CONTROL

LOOP

11135-001

–3.0V

SENSE

OUT

4.7µF

GND

ADP3605

–

19kΩ

OFF

*FOR BEST PERFORMANCE, 10µF IS RECOMMENDED

: SPRAGUE, 293D475X0010B2W

, C

: TOKIN, 1E475ZY5UC205F

11135-002

Summary of content (12 pages)

PAGE 1
FEATURES FUNCTIONAL BLOCK DIAGRAM Fully regulated adjustable output voltage High output current: 120 mA Output accuracy: ±3% 250 kHz switching frequency Low shutdown current: 2 µA typical Input voltage range: 3 V to 6 V 8-Lead SOIC package −40°C to +85°C ambient temperature range CP+ CP– 1 3 DNS SPD VIN 8 S1 S3 B ADP3605 SND DNS S2 OSC CLOCK GEN SD 4 FEEDBACK CONTROL LOOP APPLICATIONS Voltage inverters Voltage regulators Computer peripherals and add-on cards Portable instruments Battery po
PAGE 2
ADP3605 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Capacitor Selection .......................................................................9 Applications ....................................................................................... 1 Input Capacitor..............................................................................9 Functional Block Diagram ...............................................
PAGE 3
Data Sheet ADP3605 SPECIFICATIONS VIN = 5.0 V at TA = 25°C, CP = CO = 4.7 µF, unless otherwise noted. The CIN, CO, and CP capacitors in the typical application circuit (see Figure 2) are 4.7 µF. See Figure 2 conditions. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. Table 1.
PAGE 4
ADP3605 Data Sheet ABSOLUTE MAXIMUM RATINGS TA = 25°C, unless otherwise noted. Table 2. Parameter Input Voltage (VIN to GND, GND to VOUT) Input Voltage (VIN to VOUT) Output Short-Circuit Protection Power Dissipation, 8-Lead SOIC θJA 1 Operating Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 sec) Vapor Phase (60 sec) Infrared (15 sec) 1 Rating 7.
PAGE 5
Data Sheet ADP3605 CP+ 1 GND 2 CP– 3 SD ADP3605 TOP VIEW 4 (Not to Scale) 8 VIN 7 VOUT 6 NC 5 VSENSE NOTES 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. 11135-003 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 3. Pin Configuration Table 5. Pin Function Descriptions Pin No. 1 2 3 4 Mnemonic CP+ GND CP− SD 5 6 7 VSENSE NC VOUT 8 VIN Description Positive Terminal for the Pump Capacitor. Device Ground. Negative Terminal for the Pump Capacitor. Logic Level Shutdown Pin.
PAGE 6
ADP3605 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 140 270 INPUT CURRENT (mA) 260 100 80 60 40 250 3.0 3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V) 5.5 0 10 6.0 11135-007 20 11135-004 OSCILLATOR FREQUENCY (kHz) 120 30 50 70 90 LOAD CURRENT (mA) 110 130 Figure 7. Average Input Current vs. Output Current Figure 4. Oscillator Frequency vs. Supply Voltage 4.5 –2.5 3.0 VIN = 5V –2.6 2.5 3.0 1.5 NORMAL MODE (VSD = 0V) 1.0 0.5 0 –15 10 35 TEMPERATURE (°C) 60 –3.0 –3.1 11135-005 1.
PAGE 7
A1 –0.70V 2ms 11135-011 ADP3605 11135-010 Data Sheet A2 1V Figure 10. Start-Up Under Full Load 3.9V 2ms 1V Figure 11. Enable/Disable Time Under Full Load Rev.
PAGE 8
ADP3605 Data Sheet THEORY OF OPERATION S1 VIN S1 S2 + S2 S3 + S3 CP CP S4 VOUT CO S4 VOUT CO Figure 13. ADP3605 Switch Configuration Charging the Output Capacitor 11135-012 VIN During phase one, S1 and S2 are on, charging the pump capacitor to the input voltage. Before the next phase begins, S1 and S2 are turned off as well as S3 and S4 to prevent any overlap.
PAGE 9
Data Sheet ADP3605 APPLICATIONS INFORMATION CAPACITOR SELECTION INPUT CAPACITOR The high internal oscillator frequency of the ADP3605 permits the use of small capacitors for both the pump and the output capacitors.
PAGE 10
ADP3605 Data Sheet PUMP CAPACITOR The ADP3605 alternately charges CP to the input voltage when CP is switched in parallel with the input supply, and then transfers charge to CO when CP is switched in parallel with CO. During the time CP is charging, the peak current is approximately two times the output current. During the time CP is delivering charge to CO, the supply current drops down to about 3 mA.
PAGE 11
Data Sheet ADP3605 REGULATED DUAL SUPPLY SYSTEM The circuit in Figure 18 provides regulated positive and negative voltages for systems that require dual supplies from a single battery or power supply. 1N5817 ADP3607-5 2 VIN +5V VOUT 8 CO1 10µF 10µF CP1 + 10µF 1 CP+ 3 CP– VSENSE 5 SD GND 4 2 ADP3605 8 CP2 + 10µF VIN VOUT 7 1 CP+ 3 C P– –2.6V R1 16.5kΩ 1% CO2 + 10µF VSENSE 5 SD GND 4 2 11135-018 VIN = +3.3V Figure 18. Dual Supply System Rev.
PAGE 12
ADP3605 Data Sheet OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 1 5 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.