LM3686_14 Datasheet, PDF (11/28 Pages) Texas Instruments – Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator

LM3686
www.ti.com
SNVS520D – AUGUST 2008 – REVISED MARCH 2011
Typical Performance Characteristics
Unless otherwise specified, typical application (post regulation), V_BATT = 3.6V, T_A = 25°C, enable pins tied to V_BATT, V_{OUT_DCDC}
= 1.8V, V_{OUT_LILO} = 1.2V, V_{OUT_LDO} = 2.8V
V_{OUT_DCDC}
vs.
V_{OUT_LILO}
vs.
I_{OUT_DCDC}
I_{OUT_LILO}
1.830
1.825
1.820
V_IN = 3.6V
V_IN = 2.9V
1.815
1.8. 10
1.8. 05
V_IN = 4.5V
1.8. 00
0
100 200 300 400 500 600
OUTPUT CURRENT DC-DC (mA)
Efficiency DC-DC
vs.
Output Current
LILO and LDO disabled
1. 203
1. 202
1. 201
1. 200
1. 199
1. 198
1. 197
1. 196
1. 195
1. 194
1. 193
0
V_IN = 2.9V
V_IN = 4.5V
V_IN = 3.6V
50 100 150 200 250 300
OUTPUT CURRENT ( mA)
PSRR
vs.
Frequency (LILO - VIN_LILO = 3.6V)
PSRR
vs.
Frequency (LDO - VIN_LDO = 3.6V)
0
-20
-40
-60
-80
I_LDO = 200 mA
-100
-120
100
1k
10k 100k 1000k 10000k
FREQUENCY (Hz)
0
-10
-20
-30
-40
-50
-60
-70
-80
I_LILO = 200 mA
100 1k 10k 100k 1000k 10000k
FREQUENCY (Hz)
Noise
vs.
Frequency (LDO - VIN_LDO = 3.6V)
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